diff --git a/.tool-versions b/.tool-versions
index 2f81e457af..bf2689b13f 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,3 +1,3 @@
 elixir 1.7.1
 erlang 21.0.4
-nodejs 10.5.0
+nodejs 10.11.0
diff --git a/apps/block_scout_web/assets/__tests__/pages/transaction.js b/apps/block_scout_web/assets/__tests__/pages/transaction.js
index 20da637dae..b4ba0f62b7 100644
--- a/apps/block_scout_web/assets/__tests__/pages/transaction.js
+++ b/apps/block_scout_web/assets/__tests__/pages/transaction.js
@@ -13,6 +13,229 @@ test('RECEIVED_NEW_BLOCK', () => {
   expect(output.confirmations).toBe(4)
 })
 
+describe('RECEIVED_NEW_PENDING_TRANSACTION_BATCH', () => {
+  test('single transaction', () => {
+    const state = initialState
+    const action = {
+      type: 'RECEIVED_NEW_PENDING_TRANSACTION_BATCH',
+      msgs: [{
+        transactionHash: '0x00',
+        transactionHtml: 'test'
+      }]
+    }
+    const output = reducer(state, action)
+
+    expect(output.newPendingTransactions).toEqual(['test'])
+    expect(output.newPendingTransactionHashesBatch.length).toEqual(0)
+    expect(output.pendingTransactionCount).toEqual(1)
+  })
+  test('large batch of transactions', () => {
+    const state = initialState
+    const action = {
+      type: 'RECEIVED_NEW_PENDING_TRANSACTION_BATCH',
+      msgs: [{
+        transactionHash: '0x01',
+        transactionHtml: 'test 1'
+      },{
+        transactionHash: '0x02',
+        transactionHtml: 'test 2'
+      },{
+        transactionHash: '0x03',
+        transactionHtml: 'test 3'
+      },{
+        transactionHash: '0x04',
+        transactionHtml: 'test 4'
+      },{
+        transactionHash: '0x05',
+        transactionHtml: 'test 5'
+      },{
+        transactionHash: '0x06',
+        transactionHtml: 'test 6'
+      },{
+        transactionHash: '0x07',
+        transactionHtml: 'test 7'
+      },{
+        transactionHash: '0x08',
+        transactionHtml: 'test 8'
+      },{
+        transactionHash: '0x09',
+        transactionHtml: 'test 9'
+      },{
+        transactionHash: '0x10',
+        transactionHtml: 'test 10'
+      },{
+        transactionHash: '0x11',
+        transactionHtml: 'test 11'
+      }]
+    }
+    const output = reducer(state, action)
+
+    expect(output.newPendingTransactions).toEqual([])
+    expect(output.newPendingTransactionHashesBatch.length).toEqual(11)
+    expect(output.pendingTransactionCount).toEqual(11)
+  })
+  test('single transaction after single transaction', () => {
+    const state = Object.assign({}, initialState, {
+      newPendingTransactions: ['test 1'],
+      pendingTransactionCount: 1
+    })
+    const action = {
+      type: 'RECEIVED_NEW_PENDING_TRANSACTION_BATCH',
+      msgs: [{
+        transactionHash: '0x02',
+        transactionHtml: 'test 2'
+      }]
+    }
+    const output = reducer(state, action)
+
+    expect(output.newPendingTransactions).toEqual(['test 1', 'test 2'])
+    expect(output.newPendingTransactionHashesBatch.length).toEqual(0)
+    expect(output.pendingTransactionCount).toEqual(2)
+  })
+  test('single transaction after large batch of transactions', () => {
+    const state = Object.assign({}, initialState, {
+      newPendingTransactionHashesBatch: ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11']
+    })
+    const action = {
+      type: 'RECEIVED_NEW_PENDING_TRANSACTION_BATCH',
+      msgs: [{
+        transactionHash: '0x12',
+        transactionHtml: 'test 12'
+      }]
+    }
+    const output = reducer(state, action)
+
+    expect(output.newPendingTransactions).toEqual([])
+    expect(output.newPendingTransactionHashesBatch.length).toEqual(12)
+  })
+  test('large batch of transactions after large batch of transactions', () => {
+    const state = Object.assign({}, initialState, {
+      newPendingTransactionHashesBatch: ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11']
+    })
+    const action = {
+      type: 'RECEIVED_NEW_PENDING_TRANSACTION_BATCH',
+      msgs: [{
+        transactionHash: '0x12',
+        transactionHtml: 'test 12'
+      },{
+        transactionHash: '0x13',
+        transactionHtml: 'test 13'
+      },{
+        transactionHash: '0x14',
+        transactionHtml: 'test 14'
+      },{
+        transactionHash: '0x15',
+        transactionHtml: 'test 15'
+      },{
+        transactionHash: '0x16',
+        transactionHtml: 'test 16'
+      },{
+        transactionHash: '0x17',
+        transactionHtml: 'test 17'
+      },{
+        transactionHash: '0x18',
+        transactionHtml: 'test 18'
+      },{
+        transactionHash: '0x19',
+        transactionHtml: 'test 19'
+      },{
+        transactionHash: '0x20',
+        transactionHtml: 'test 20'
+      },{
+        transactionHash: '0x21',
+        transactionHtml: 'test 21'
+      },{
+        transactionHash: '0x22',
+        transactionHtml: 'test 22'
+      }]
+    }
+    const output = reducer(state, action)
+
+    expect(output.newPendingTransactions).toEqual([])
+    expect(output.newPendingTransactionHashesBatch.length).toEqual(22)
+  })
+  test('after disconnection', () => {
+    const state = Object.assign({}, initialState, {
+      channelDisconnected: true
+    })
+    const action = {
+      type: 'RECEIVED_NEW_PENDING_TRANSACTION_BATCH',
+      msgs: [{
+        transactionHash: '0x00',
+        transactionHtml: 'test'
+      }]
+    }
+    const output = reducer(state, action)
+
+    expect(output.newPendingTransactions).toEqual([])
+    expect(output.batchCountAccumulator).toEqual(0)
+  })
+  test('on page 2+', () => {
+    const state = Object.assign({}, initialState, {
+      beyondPageOne: true,
+      pendingTransactionCount: 1
+    })
+    const action = {
+      type: 'RECEIVED_NEW_PENDING_TRANSACTION_BATCH',
+      msgs: [{
+        transactionHash: '0x00',
+        transactionHtml: 'test'
+      }]
+    }
+    const output = reducer(state, action)
+
+    expect(output.newPendingTransactions).toEqual([])
+    expect(output.batchCountAccumulator).toEqual(0)
+    expect(output.pendingTransactionCount).toEqual(2)
+  })
+})
+
+describe('RECEIVED_NEW_TRANSACTION', () => {
+  test('single transaction collated', () => {
+    const state = { ...initialState, pendingTransactionCount: 2 }
+    const action = {
+      type: 'RECEIVED_NEW_TRANSACTION',
+      msg: {
+        transactionHash: '0x00'
+      }
+    }
+    const output = reducer(state, action)
+
+    expect(output.pendingTransactionCount).toBe(1)
+    expect(output.newTransactionHashes).toEqual(['0x00'])
+  })
+  test('single transaction collated after batch', () => {
+    const state = Object.assign({}, initialState, {
+      newPendingTransactionHashesBatch: ['0x01', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11']
+    })
+    const action = {
+      type: 'RECEIVED_NEW_TRANSACTION',
+      msg: {
+        transactionHash: '0x01'
+      }
+    }
+    const output = reducer(state, action)
+
+    expect(output.newPendingTransactionHashesBatch.length).toEqual(10)
+    expect(output.newPendingTransactionHashesBatch).not.toContain('0x01')
+  })
+  test('on page 2+', () => {
+    const state = Object.assign({}, initialState, {
+      beyondPageOne: true,
+      pendingTransactionCount: 2
+    })
+    const action = {
+      type: 'RECEIVED_NEW_TRANSACTION',
+      msg: {
+        transactionHash: '0x01'
+      }
+    }
+    const output = reducer(state, action)
+
+    expect(output.pendingTransactionCount).toEqual(1)
+  })
+})
+
 describe('RECEIVED_NEW_TRANSACTION_BATCH', () => {
   test('single transaction', () => {
     const state = initialState
@@ -79,7 +302,6 @@ describe('RECEIVED_NEW_TRANSACTION_BATCH', () => {
   })
   test('single transaction after large batch of transactions', () => {
     const state = Object.assign({}, initialState, {
-      newTransactions: [],
       batchCountAccumulator: 11
     })
     const action = {
@@ -95,7 +317,6 @@ describe('RECEIVED_NEW_TRANSACTION_BATCH', () => {
   })
   test('large batch of transactions after large batch of transactions', () => {
     const state = Object.assign({}, initialState, {
-      newTransactions: [],
       batchCountAccumulator: 11
     })
     const action = {
@@ -146,7 +367,8 @@ describe('RECEIVED_NEW_TRANSACTION_BATCH', () => {
   })
   test('on page 2+', () => {
     const state = Object.assign({}, initialState, {
-      beyondPageOne: true
+      beyondPageOne: true,
+      transactionCount: 1
     })
     const action = {
       type: 'RECEIVED_NEW_TRANSACTION_BATCH',
@@ -158,5 +380,6 @@ describe('RECEIVED_NEW_TRANSACTION_BATCH', () => {
 
     expect(output.newTransactions).toEqual([])
     expect(output.batchCountAccumulator).toEqual(0)
+    expect(output.transactionCount).toEqual(2)
   })
 })
diff --git a/apps/block_scout_web/assets/css/components/_animations.scss b/apps/block_scout_web/assets/css/components/_animations.scss
index 0db1f9c125..622f8de130 100644
--- a/apps/block_scout_web/assets/css/components/_animations.scss
+++ b/apps/block_scout_web/assets/css/components/_animations.scss
@@ -60,8 +60,20 @@
   }
 }
 
+@keyframes shrink-out {
+  0% {
+    transform: scale(1);
+    opacity: 1;
+  }
+  100% {
+    opacity: 0;
+    transform: scale(0.5);
+  }
+}
+
 .fade-in {
-  animation: fade-in 0.6s ease-out forwards;
+  opacity: 0;
+  animation: fade-in 0.6s ease-out 0.4s forwards;
 }
 
 .fade-up-blocks-chain {
@@ -84,3 +96,7 @@
     animation: fade-up--mobile 0.6s cubic-bezier(0.455, 0.03, 0.515, 0.955);
   }
 }
+
+.shrink-out {
+  animation: shrink-out 0.45s cubic-bezier(0.55, 0.055, 0.675, 0.19) forwards;
+}
diff --git a/apps/block_scout_web/assets/css/components/_dropdown.scss b/apps/block_scout_web/assets/css/components/_dropdown.scss
index 84bc109cb8..d62e7820f2 100644
--- a/apps/block_scout_web/assets/css/components/_dropdown.scss
+++ b/apps/block_scout_web/assets/css/components/_dropdown.scss
@@ -4,3 +4,14 @@
   width: 100%;
   box-shadow: $box-shadow;
 }
+
+.dropdown-search-icon {
+  top: 0.5rem;
+  left: 0.625rem;
+  pointer-events: none;
+  color: $gray-300;
+}
+
+.dropdown-search-field {
+  padding-left: 2rem;
+}
diff --git a/apps/block_scout_web/assets/js/app.js b/apps/block_scout_web/assets/js/app.js
index caa01d32d4..b26832696f 100644
--- a/apps/block_scout_web/assets/js/app.js
+++ b/apps/block_scout_web/assets/js/app.js
@@ -32,6 +32,7 @@ import './lib/smart_contract/wei_ether_converter'
 import './lib/pretty_json'
 import './lib/try_api'
 import './lib/token_balance_dropdown'
+import './lib/token_balance_dropdown_search'
 import './lib/token_transfers_toggle'
 import './lib/stop_propagation'
 
diff --git a/apps/block_scout_web/assets/js/lib/token_balance_dropdown_search.js b/apps/block_scout_web/assets/js/lib/token_balance_dropdown_search.js
new file mode 100644
index 0000000000..ce31e0cb90
--- /dev/null
+++ b/apps/block_scout_web/assets/js/lib/token_balance_dropdown_search.js
@@ -0,0 +1,51 @@
+import $ from 'jquery'
+
+const stringContains = (query, string) => {
+  return string.toLowerCase().search(query) === -1
+}
+
+const hideUnmatchedToken = (query, token) => {
+  const $token = $(token)
+  const tokenName = $token.data('token-name')
+  const tokenSymbol = $token.data('token-symbol')
+
+  if (stringContains(query, tokenName) && stringContains(query, tokenSymbol)) {
+    $token.addClass('d-none')
+  } else {
+    $token.removeClass('d-none')
+  }
+}
+
+const hideEmptyType = (container) => {
+  const $container = $(container)
+  const type = $container.data('token-type')
+  const countVisibleTokens = $container.children('[data-token-name]:not(.d-none)').length
+
+  if (countVisibleTokens === 0) {
+    $container.addClass('d-none')
+  } else {
+    $(`[data-number-of-tokens-by-type='${type}']`).empty().append(countVisibleTokens)
+    $container.removeClass('d-none')
+  }
+}
+
+const TokenBalanceDropdownSearch = (element, event) => {
+  const $element = $(element)
+  const $tokensCount = $element.find('[data-tokens-count]')
+  const $tokens = $element.find('[data-token-name]')
+  const $tokenTypes = $element.find('[data-token-type]')
+  const query = event.target.value.toLowerCase()
+
+  $tokens.each((_index, token) => hideUnmatchedToken(query, token))
+  $tokenTypes.each((_index, container) => hideEmptyType(container))
+
+  $tokensCount.html($tokensCount.html().replace(/\d+/g, $tokens.not('.d-none').length))
+}
+
+$('[data-token-balance-dropdown]').on('hidden.bs.dropdown', _event => {
+  $('[data-filter-dropdown-tokens]').val('').trigger('input')
+})
+
+$('[data-token-balance-dropdown]').on('input', function (event) {
+  TokenBalanceDropdownSearch(this, event)
+})
diff --git a/apps/block_scout_web/assets/js/pages/chain.js b/apps/block_scout_web/assets/js/pages/chain.js
index c6fc48cbc9..08ed8fe023 100644
--- a/apps/block_scout_web/assets/js/pages/chain.js
+++ b/apps/block_scout_web/assets/js/pages/chain.js
@@ -4,7 +4,7 @@ import numeral from 'numeral'
 import socket from '../socket'
 import { updateAllAges } from '../lib/from_now'
 import { exchangeRateChannel, formatUsdValue } from '../lib/currency'
-import { batchChannel, initRedux } from '../utils'
+import { batchChannel, initRedux, slideDownPrepend } from '../utils'
 import { createMarketHistoryChart } from '../lib/market_history_chart'
 
 const BATCH_THRESHOLD = 10
@@ -131,7 +131,7 @@ if ($chainDetailsPage.length) {
           .children()
           .slice($transactionsList.children().length - newTransactionsToInsert.length, $transactionsList.children().length)
           .remove()
-        $transactionsList.prepend(newTransactionsToInsert.reverse().join(''))
+        slideDownPrepend($transactionsList, newTransactionsToInsert.reverse().join(''))
 
         updateAllAges()
       }
diff --git a/apps/block_scout_web/assets/js/pages/transaction.js b/apps/block_scout_web/assets/js/pages/transaction.js
index 6598e33659..5468cef4a8 100644
--- a/apps/block_scout_web/assets/js/pages/transaction.js
+++ b/apps/block_scout_web/assets/js/pages/transaction.js
@@ -1,4 +1,5 @@
 import $ from 'jquery'
+import _ from 'lodash'
 import URI from 'urijs'
 import humps from 'humps'
 import numeral from 'numeral'
@@ -10,12 +11,16 @@ const BATCH_THRESHOLD = 10
 
 export const initialState = {
   batchCountAccumulator: 0,
+  newPendingTransactionHashesBatch: [],
   beyondPageOne: null,
   blockNumber: null,
   channelDisconnected: false,
   confirmations: null,
+  newPendingTransactions: [],
   newTransactions: [],
-  transactionCount: null
+  newTransactionHashes: [],
+  transactionCount: null,
+  pendingTransactionCount: null
 }
 
 export function reducer (state = initialState, action) {
@@ -24,7 +29,8 @@ export function reducer (state = initialState, action) {
       return Object.assign({}, state, {
         beyondPageOne: action.beyondPageOne,
         blockNumber: parseInt(action.blockNumber, 10),
-        transactionCount: numeral(action.transactionCount).value()
+        transactionCount: numeral(action.transactionCount).value(),
+        pendingTransactionCount: numeral(action.pendingTransactionCount).value()
       })
     }
     case 'CHANNEL_DISCONNECTED': {
@@ -40,8 +46,46 @@ export function reducer (state = initialState, action) {
         })
       } else return state
     }
+    case 'RECEIVED_NEW_TRANSACTION': {
+      if (state.channelDisconnected) return state
+
+      return Object.assign({}, state, {
+        newPendingTransactionHashesBatch: _.without(state.newPendingTransactionHashesBatch, action.msg.transactionHash),
+        pendingTransactionCount: state.pendingTransactionCount - 1,
+        newTransactionHashes: [action.msg.transactionHash]
+      })
+    }
+    case 'RECEIVED_NEW_PENDING_TRANSACTION_BATCH': {
+      if (state.channelDisconnected) return state
+
+      const pendingTransactionCount = state.pendingTransactionCount + action.msgs.length
+
+      if (state.beyondPageOne) return Object.assign({}, state, { pendingTransactionCount })
+
+      if (!state.newPendingTransactionHashesBatch.length && action.msgs.length < BATCH_THRESHOLD) {
+        return Object.assign({}, state, {
+          newPendingTransactions: [
+            ...state.newPendingTransactions,
+            ..._.map(action.msgs, 'transactionHtml')
+          ],
+          pendingTransactionCount
+        })
+      } else {
+        return Object.assign({}, state, {
+          newPendingTransactionHashesBatch: [
+            ...state.newPendingTransactionHashesBatch,
+            ..._.map(action.msgs, 'transactionHash')
+          ],
+          pendingTransactionCount
+        })
+      }
+    }
     case 'RECEIVED_NEW_TRANSACTION_BATCH': {
-      if (state.channelDisconnected || state.beyondPageOne) return state
+      if (state.channelDisconnected) return state
+
+      const transactionCount = state.transactionCount + action.msgs.length
+
+      if (state.beyondPageOne) return Object.assign({}, state, { transactionCount })
 
       if (!state.batchCountAccumulator && action.msgs.length < BATCH_THRESHOLD) {
         return Object.assign({}, state, {
@@ -49,12 +93,12 @@ export function reducer (state = initialState, action) {
             ...state.newTransactions,
             ...action.msgs.map(({transactionHtml}) => transactionHtml)
           ],
-          transactionCount: state.transactionCount + action.msgs.length
+          transactionCount
         })
       } else {
         return Object.assign({}, state, {
           batchCountAccumulator: state.batchCountAccumulator + action.msgs.length,
-          transactionCount: state.transactionCount + action.msgs.length
+          transactionCount
         })
       }
     }
@@ -91,23 +135,89 @@ if ($transactionDetailsPage.length) {
   })
 }
 
+const $transactionPendingListPage = $('[data-page="transaction-pending-list"]')
+if ($transactionPendingListPage.length) {
+  initRedux(reducer, {
+    main (store) {
+      store.dispatch({
+        type: 'PAGE_LOAD',
+        pendingTransactionCount: $('[data-selector="transaction-pending-count"]').text(),
+        beyondPageOne: !!humps.camelizeKeys(URI(window.location).query(true)).insertedAt
+      })
+      const transactionsChannel = socket.channel(`transactions:new_transaction`)
+      transactionsChannel.join()
+      transactionsChannel.onError(() => store.dispatch({ type: 'CHANNEL_DISCONNECTED' }))
+      transactionsChannel.on('new_transaction', (msg) =>
+        store.dispatch({ type: 'RECEIVED_NEW_TRANSACTION', msg: humps.camelizeKeys(msg) })
+      )
+      const pendingTransactionsChannel = socket.channel(`transactions:new_pending_transaction`)
+      pendingTransactionsChannel.join()
+      pendingTransactionsChannel.onError(() => store.dispatch({ type: 'CHANNEL_DISCONNECTED' }))
+      pendingTransactionsChannel.on('new_pending_transaction', batchChannel((msgs) =>
+        store.dispatch({ type: 'RECEIVED_NEW_PENDING_TRANSACTION_BATCH', msgs: humps.camelizeKeys(msgs) }))
+      )
+    },
+    render (state, oldState) {
+      const $channelBatching = $('[data-selector="channel-batching-message"]')
+      const $channelBatchingCount = $('[data-selector="channel-batching-count"]')
+      const $channelDisconnected = $('[data-selector="channel-disconnected-message"]')
+      const $pendingTransactionsList = $('[data-selector="transactions-pending-list"]')
+      const $pendingTransactionsCount = $('[data-selector="transaction-pending-count"]')
+
+      if (state.channelDisconnected) $channelDisconnected.show()
+      if (oldState.pendingTransactionCount !== state.pendingTransactionCount) {
+        $pendingTransactionsCount.empty().append(numeral(state.pendingTransactionCount).format())
+      }
+      if (oldState.newTransactionHashes !== state.newTransactionHashes && state.newTransactionHashes.length > 0) {
+        const $transaction = $(`[data-transaction-hash="${state.newTransactionHashes[0]}"]`)
+        $transaction.addClass('shrink-out')
+        setTimeout(() => $transaction.slideUp({
+          complete: () => {
+            if ($pendingTransactionsList.children().length < 2 && state.pendingTransactionCount > 0) {
+              window.location.href = URI(window.location).removeQuery('inserted_at').removeQuery('hash').toString()
+            } else {
+              $transaction.remove()
+            }
+          }
+        }), 400)
+      }
+      if (state.newPendingTransactionHashesBatch.length) {
+        $channelBatching.show()
+        $channelBatchingCount[0].innerHTML = numeral(state.newPendingTransactionHashesBatch.length).format()
+      } else {
+        $channelBatching.hide()
+      }
+      if (oldState.newPendingTransactions !== state.newPendingTransactions) {
+        const newTransactionsToInsert = state.newPendingTransactions.slice(oldState.newPendingTransactions.length)
+        $pendingTransactionsList
+          .children()
+          .slice($pendingTransactionsList.children().length - newTransactionsToInsert.length,
+            $pendingTransactionsList.children().length
+          )
+          .remove()
+        prependWithClingBottom($pendingTransactionsList, newTransactionsToInsert.reverse().join(''))
+
+        updateAllAges()
+      }
+    }
+  })
+}
+
 const $transactionListPage = $('[data-page="transaction-list"]')
 if ($transactionListPage.length) {
   initRedux(reducer, {
     main (store) {
-      const state = store.dispatch({
+      store.dispatch({
         type: 'PAGE_LOAD',
         transactionCount: $('[data-selector="transaction-count"]').text(),
         beyondPageOne: !!humps.camelizeKeys(URI(window.location).query(true)).index
       })
-      if (!state.beyondPageOne) {
-        const transactionsChannel = socket.channel(`transactions:new_transaction`)
-        transactionsChannel.join()
-        transactionsChannel.onError(() => store.dispatch({ type: 'CHANNEL_DISCONNECTED' }))
-        transactionsChannel.on('new_transaction', batchChannel((msgs) =>
-          store.dispatch({ type: 'RECEIVED_NEW_TRANSACTION_BATCH', msgs: humps.camelizeKeys(msgs) }))
-        )
-      }
+      const transactionsChannel = socket.channel(`transactions:new_transaction`)
+      transactionsChannel.join()
+      transactionsChannel.onError(() => store.dispatch({ type: 'CHANNEL_DISCONNECTED' }))
+      transactionsChannel.on('new_transaction', batchChannel((msgs) =>
+        store.dispatch({ type: 'RECEIVED_NEW_TRANSACTION_BATCH', msgs: humps.camelizeKeys(msgs) }))
+      )
     },
     render (state, oldState) {
       const $channelBatching = $('[data-selector="channel-batching-message"]')
diff --git a/apps/block_scout_web/assets/js/utils.js b/apps/block_scout_web/assets/js/utils.js
index bbb21ba718..b0a2f89c3c 100644
--- a/apps/block_scout_web/assets/js/utils.js
+++ b/apps/block_scout_web/assets/js/utils.js
@@ -34,11 +34,16 @@ export function initRedux (reducer, { main, render, debug } = {}) {
   if (main) main(store)
 }
 
+export function slideDownPrepend ($el, content, callback) {
+  const $content = $(content)
+  $el.prepend($content.hide())
+  $content.slideDown({ complete: callback })
+}
 export function prependWithClingBottom ($el, content) {
   function userAtTop () {
     return window.scrollY < $('[data-selector="navbar"]').outerHeight()
   }
-  if (userAtTop()) return $el.prepend(content)
+  if (userAtTop()) return slideDownPrepend($el, content)
 
   let isAnimating
   function setIsAnimating () {
@@ -67,8 +72,9 @@ export function prependWithClingBottom ($el, content) {
     $el.off('animationstart', setIsAnimating)
     $el.off('animationend animationcancel', stopClinging)
   }
-  $el.on('animationend animationcancel', stopClinging)
-  setTimeout(() => !isAnimating && stopClinging(), 100)
 
-  return $el.prepend(content)
+  return slideDownPrepend($el, content, () => {
+    $el.on('animationend animationcancel', stopClinging)
+    setTimeout(() => !isAnimating && stopClinging(), 100)
+  })
 }
diff --git a/apps/block_scout_web/assets/package-lock.json b/apps/block_scout_web/assets/package-lock.json
index 6f0ffa5568..83b0b292fd 100644
--- a/apps/block_scout_web/assets/package-lock.json
+++ b/apps/block_scout_web/assets/package-lock.json
@@ -1481,9 +1481,9 @@
       "dev": true
     },
     "bootstrap": {
-      "version": "4.1.1",
-      "resolved": "https://registry.npmjs.org/bootstrap/-/bootstrap-4.1.1.tgz",
-      "integrity": "sha512-SpiDSOcbg4J/PjVSt4ny5eY6j74VbVSjROY4Fb/WIUXBV9cnb5luyR4KnPvNoXuGnBK1T+nJIWqRsvU3yP8Mcg=="
+      "version": "4.1.3",
+      "resolved": "https://registry.npmjs.org/bootstrap/-/bootstrap-4.1.3.tgz",
+      "integrity": "sha512-rDFIzgXcof0jDyjNosjv4Sno77X4KuPeFxG2XZZv1/Kc8DRVGVADdoQyyOVDwPqL36DDmtCQbrpMCqvpPLJQ0w=="
     },
     "brace-expansion": {
       "version": "1.1.11",
diff --git a/apps/block_scout_web/assets/package.json b/apps/block_scout_web/assets/package.json
index f363ff1246..a3c05cba5a 100644
--- a/apps/block_scout_web/assets/package.json
+++ b/apps/block_scout_web/assets/package.json
@@ -21,7 +21,7 @@
   "dependencies": {
     "@fortawesome/fontawesome-free": "^5.1.0-4",
     "bignumber.js": "^7.2.1",
-    "bootstrap": "^4.1.0",
+    "bootstrap": "^4.1.3",
     "chart.js": "^2.7.2",
     "clipboard": "^2.0.1",
     "humps": "^2.0.1",
diff --git a/apps/block_scout_web/assets/static/android-chrome-192x192.png b/apps/block_scout_web/assets/static/android-chrome-192x192.png
new file mode 100644
index 0000000000..5a5c281449
Binary files /dev/null and b/apps/block_scout_web/assets/static/android-chrome-192x192.png differ
diff --git a/apps/block_scout_web/assets/static/android-chrome-512x512.png b/apps/block_scout_web/assets/static/android-chrome-512x512.png
new file mode 100644
index 0000000000..0b4840d41a
Binary files /dev/null and b/apps/block_scout_web/assets/static/android-chrome-512x512.png differ
diff --git a/apps/block_scout_web/assets/static/apple-touch-icon.png b/apps/block_scout_web/assets/static/apple-touch-icon.png
new file mode 100644
index 0000000000..70a5198240
Binary files /dev/null and b/apps/block_scout_web/assets/static/apple-touch-icon.png differ
diff --git a/apps/block_scout_web/assets/static/browserconfig.xml b/apps/block_scout_web/assets/static/browserconfig.xml
new file mode 100644
index 0000000000..b3930d0f04
--- /dev/null
+++ b/apps/block_scout_web/assets/static/browserconfig.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<browserconfig>
+    <msapplication>
+        <tile>
+            <square150x150logo src="/mstile-150x150.png"/>
+            <TileColor>#da532c</TileColor>
+        </tile>
+    </msapplication>
+</browserconfig>
diff --git a/apps/block_scout_web/assets/static/favicon-16x16.png b/apps/block_scout_web/assets/static/favicon-16x16.png
new file mode 100644
index 0000000000..fd59e524be
Binary files /dev/null and b/apps/block_scout_web/assets/static/favicon-16x16.png differ
diff --git a/apps/block_scout_web/assets/static/favicon-32x32.png b/apps/block_scout_web/assets/static/favicon-32x32.png
new file mode 100644
index 0000000000..3b9e22b4e3
Binary files /dev/null and b/apps/block_scout_web/assets/static/favicon-32x32.png differ
diff --git a/apps/block_scout_web/assets/static/favicon.ico b/apps/block_scout_web/assets/static/favicon.ico
index 73de524aaa..293b5abbc7 100644
Binary files a/apps/block_scout_web/assets/static/favicon.ico and b/apps/block_scout_web/assets/static/favicon.ico differ
diff --git a/apps/block_scout_web/assets/static/mstile-150x150.png b/apps/block_scout_web/assets/static/mstile-150x150.png
new file mode 100644
index 0000000000..f9a6b5a8dd
Binary files /dev/null and b/apps/block_scout_web/assets/static/mstile-150x150.png differ
diff --git a/apps/block_scout_web/assets/static/safari-pinned-tab.svg b/apps/block_scout_web/assets/static/safari-pinned-tab.svg
new file mode 100644
index 0000000000..0c9f9bdc17
--- /dev/null
+++ b/apps/block_scout_web/assets/static/safari-pinned-tab.svg
@@ -0,0 +1,39 @@
+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN"
+ "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<svg version="1.0" xmlns="http://www.w3.org/2000/svg"
+ width="512.000000pt" height="512.000000pt" viewBox="0 0 512.000000 512.000000"
+ preserveAspectRatio="xMidYMid meet">
+<metadata>
+Created by potrace 1.11, written by Peter Selinger 2001-2013
+</metadata>
+<g transform="translate(0.000000,512.000000) scale(0.100000,-0.100000)"
+fill="#000000" stroke="none">
+<path d="M1240 4188 c-123 -42 -202 -96 -276 -193 -33 -43 -78 -132 -89 -178
+-4 -15 -19 -36 -34 -47 -70 -54 -86 -67 -116 -100 -42 -44 -85 -96 -113 -136
+-34 -50 -168 -323 -163 -333 2 -2 -1 -7 -6 -10 -4 -3 -15 -22 -25 -41 -9 -19
+-40 -84 -68 -145 -29 -60 -74 -154 -101 -208 -27 -54 -49 -104 -49 -112 0 -8
+-4 -15 -9 -15 -5 0 -12 -10 -16 -22 -4 -13 -8 -25 -9 -28 -1 -3 -19 -38 -39
+-78 -37 -72 -91 -220 -101 -277 -3 -16 -10 -52 -15 -80 -9 -49 -8 -290 2 -330
+2 -11 8 -40 12 -65 4 -25 10 -49 13 -55 4 -5 8 -21 10 -35 2 -13 7 -29 11 -35
+4 -5 13 -29 21 -52 7 -24 17 -43 22 -43 4 0 8 -8 8 -18 0 -10 14 -39 30 -65
+17 -26 30 -52 30 -57 0 -6 5 -10 10 -10 6 0 10 -5 10 -11 0 -6 6 -16 12 -23 7
+-7 24 -28 38 -47 134 -182 382 -339 623 -394 102 -23 315 -39 342 -26 6 3 19
+6 30 6 11 1 45 5 75 10 30 5 57 9 60 10 3 0 11 4 18 8 6 5 12 6 12 3 0 -3 30
+6 68 20 37 14 72 27 77 28 16 3 115 56 172 92 178 114 345 316 423 514 32 80
+59 178 66 235 7 68 11 77 31 74 10 0 20 0 23 1 44 17 303 25 460 15 190 -12
+186 -11 188 -52 1 -28 7 -61 16 -91 3 -9 7 -28 10 -42 15 -84 85 -240 156
+-345 49 -73 175 -207 251 -267 56 -45 212 -127 296 -157 186 -66 380 -80 592
+-45 55 9 181 53 261 91 216 103 405 288 511 503 22 43 39 82 39 87 0 4 6 20
+14 34 17 33 25 64 50 193 13 65 15 294 4 356 -14 77 -37 163 -55 210 -4 8 -7
+17 -8 20 -1 3 -6 16 -12 30 -31 72 -56 127 -113 245 -34 72 -86 180 -115 240
+-29 61 -81 169 -116 240 -34 72 -63 132 -64 135 -5 22 -87 176 -118 222 -47
+70 -146 173 -209 217 -28 20 -49 44 -53 60 -3 14 -22 59 -43 100 -128 256
+-448 362 -713 236 -117 -55 -228 -177 -271 -299 -21 -59 -19 -56 -54 -61 -16
+-2 -49 -8 -74 -14 -49 -10 -165 -25 -192 -23 -22 1 -25 -3 -32 -62 -11 -77
+-37 -129 -89 -175 -50 -44 -63 -51 -108 -66 -100 -34 -197 -19 -291 43 -65 42
+-118 141 -120 223 -1 16 -6 29 -12 30 -6 0 -20 2 -31 5 -11 2 -40 6 -65 9 -25
+3 -61 8 -80 12 -19 3 -44 7 -55 8 -89 13 -89 13 -124 95 -51 120 -148 221
+-261 273 -100 47 -108 48 -235 51 -76 2 -113 -2 -155 -16z"/>
+</g>
+</svg>
diff --git a/apps/block_scout_web/assets/static/site.webmanifest b/apps/block_scout_web/assets/static/site.webmanifest
new file mode 100644
index 0000000000..b20abb7cbb
--- /dev/null
+++ b/apps/block_scout_web/assets/static/site.webmanifest
@@ -0,0 +1,19 @@
+{
+    "name": "",
+    "short_name": "",
+    "icons": [
+        {
+            "src": "/android-chrome-192x192.png",
+            "sizes": "192x192",
+            "type": "image/png"
+        },
+        {
+            "src": "/android-chrome-512x512.png",
+            "sizes": "512x512",
+            "type": "image/png"
+        }
+    ],
+    "theme_color": "#ffffff",
+    "background_color": "#ffffff",
+    "display": "standalone"
+}
diff --git a/apps/block_scout_web/lib/block_scout_web/chain.ex b/apps/block_scout_web/lib/block_scout_web/chain.ex
index 7a3be7a6ee..c41229acec 100644
--- a/apps/block_scout_web/lib/block_scout_web/chain.ex
+++ b/apps/block_scout_web/lib/block_scout_web/chain.ex
@@ -6,9 +6,11 @@ defmodule BlockScoutWeb.Chain do
   import Explorer.Chain,
     only: [
       hash_to_address: 1,
+      hash_to_block: 1,
       hash_to_transaction: 1,
       number_to_block: 1,
       string_to_address_hash: 1,
+      string_to_block_hash: 1,
       string_to_transaction_hash: 1
     ]
 
@@ -53,7 +55,7 @@ defmodule BlockScoutWeb.Chain do
   def from_param("0x" <> number_string = param) do
     case String.length(number_string) do
       40 -> address_from_param(param)
-      64 -> transaction_from_param(param)
+      64 -> block_or_transaction_from_param(param)
       _ -> {:error, :not_found}
     end
   end
@@ -196,6 +198,12 @@ defmodule BlockScoutWeb.Chain do
     %{"address_hash" => to_string(address_hash), "value" => Decimal.to_integer(value)}
   end
 
+  defp block_or_transaction_from_param(param) do
+    with {:error, :not_found} <- transaction_from_param(param) do
+      hash_string_to_block(param)
+    end
+  end
+
   defp transaction_from_param(param) do
     with {:ok, hash} <- string_to_transaction_hash(param) do
       hash_to_transaction(hash)
@@ -203,4 +211,12 @@ defmodule BlockScoutWeb.Chain do
       :error -> {:error, :not_found}
     end
   end
+
+  defp hash_string_to_block(hash_string) do
+    with {:ok, hash} <- string_to_block_hash(hash_string) do
+      hash_to_block(hash)
+    else
+      :error -> {:error, :not_found}
+    end
+  end
 end
diff --git a/apps/block_scout_web/lib/block_scout_web/channels/transaction_channel.ex b/apps/block_scout_web/lib/block_scout_web/channels/transaction_channel.ex
index 1887c90ffd..1080bde074 100644
--- a/apps/block_scout_web/lib/block_scout_web/channels/transaction_channel.ex
+++ b/apps/block_scout_web/lib/block_scout_web/channels/transaction_channel.ex
@@ -5,18 +5,41 @@ defmodule BlockScoutWeb.TransactionChannel do
   use BlockScoutWeb, :channel
 
   alias BlockScoutWeb.TransactionView
+  alias Explorer.Chain.Hash
   alias Phoenix.View
 
-  intercept(["new_transaction"])
+  intercept(["new_pending_transaction", "new_transaction"])
 
   def join("transactions:new_transaction", _params, socket) do
     {:ok, %{}, socket}
   end
 
+  def join("transactions:new_pending_transaction", _params, socket) do
+    {:ok, %{}, socket}
+  end
+
   def join("transactions:" <> _transaction_hash, _params, socket) do
     {:ok, %{}, socket}
   end
 
+  def handle_out("new_pending_transaction", %{transaction: transaction}, socket) do
+    Gettext.put_locale(BlockScoutWeb.Gettext, socket.assigns.locale)
+
+    rendered_transaction =
+      View.render_to_string(
+        TransactionView,
+        "_pending_tile.html",
+        transaction: transaction
+      )
+
+    push(socket, "new_pending_transaction", %{
+      transaction_hash: Hash.to_string(transaction.hash),
+      transaction_html: rendered_transaction
+    })
+
+    {:noreply, socket}
+  end
+
   def handle_out("new_transaction", %{transaction: transaction}, socket) do
     Gettext.put_locale(BlockScoutWeb.Gettext, socket.assigns.locale)
 
@@ -28,6 +51,7 @@ defmodule BlockScoutWeb.TransactionChannel do
       )
 
     push(socket, "new_transaction", %{
+      transaction_hash: Hash.to_string(transaction.hash),
       transaction_html: rendered_transaction
     })
 
diff --git a/apps/block_scout_web/lib/block_scout_web/controllers/block_controller.ex b/apps/block_scout_web/lib/block_scout_web/controllers/block_controller.ex
index 48d01318d1..80a41bf4a3 100644
--- a/apps/block_scout_web/lib/block_scout_web/controllers/block_controller.ex
+++ b/apps/block_scout_web/lib/block_scout_web/controllers/block_controller.ex
@@ -23,7 +23,7 @@ defmodule BlockScoutWeb.BlockController do
     render(conn, "index.html", blocks: blocks, next_page_params: next_page_params(next_page, blocks, params))
   end
 
-  def show(conn, %{"id" => number}) do
-    redirect(conn, to: block_transaction_path(conn, :index, number))
+  def show(conn, %{"hash_or_number" => hash_or_number}) do
+    redirect(conn, to: block_transaction_path(conn, :index, hash_or_number))
   end
 end
diff --git a/apps/block_scout_web/lib/block_scout_web/controllers/block_transaction_controller.ex b/apps/block_scout_web/lib/block_scout_web/controllers/block_transaction_controller.ex
index 5924ad658d..1220231a30 100644
--- a/apps/block_scout_web/lib/block_scout_web/controllers/block_transaction_controller.ex
+++ b/apps/block_scout_web/lib/block_scout_web/controllers/block_transaction_controller.ex
@@ -1,15 +1,18 @@
 defmodule BlockScoutWeb.BlockTransactionController do
   use BlockScoutWeb, :controller
 
-  import BlockScoutWeb.Chain,
-    only: [paging_options: 1, param_to_block_number: 1, next_page_params: 3, split_list_by_page: 1]
+  import BlockScoutWeb.Chain, only: [paging_options: 1, next_page_params: 3, split_list_by_page: 1]
+  import Explorer.Chain, only: [hash_to_block: 2, number_to_block: 2, string_to_block_hash: 1]
 
   alias Explorer.Chain
 
-  def index(conn, %{"block_id" => formatted_block_number} = params) do
-    with {:ok, block_number} <- param_to_block_number(formatted_block_number),
-         {:ok, block} <- Chain.number_to_block(block_number, necessity_by_association: %{miner: :required}),
-         block_transaction_count <- Chain.block_to_transaction_count(block) do
+  def index(conn, %{"block_hash_or_number" => formatted_block_hash_or_number} = params) do
+    with {:ok, block} <-
+           param_block_hash_or_number_to_block(formatted_block_hash_or_number,
+             necessity_by_association: %{miner: :required}
+           ) do
+      block_transaction_count = Chain.block_to_transaction_count(block)
+
       full_options =
         Keyword.merge(
           [
@@ -36,11 +39,30 @@ defmodule BlockScoutWeb.BlockTransactionController do
         transactions: transactions
       )
     else
-      {:error, :invalid} ->
+      {:error, {:invalid, :hash}} ->
+        not_found(conn)
+
+      {:error, {:invalid, :number}} ->
         not_found(conn)
 
       {:error, :not_found} ->
         not_found(conn)
     end
   end
+
+  defp param_block_hash_or_number_to_block("0x" <> _ = param, options) do
+    with {:ok, hash} <- string_to_block_hash(param) do
+      hash_to_block(hash, options)
+    else
+      :error -> {:error, {:invalid, :hash}}
+    end
+  end
+
+  defp param_block_hash_or_number_to_block(number_string, options) when is_binary(number_string) do
+    with {:ok, number} <- BlockScoutWeb.Chain.param_to_block_number(number_string) do
+      number_to_block(number, options)
+    else
+      {:error, :invalid} -> {:error, {:invalid, :number}}
+    end
+  end
 end
diff --git a/apps/block_scout_web/lib/block_scout_web/controllers/smart_contract_controller.ex b/apps/block_scout_web/lib/block_scout_web/controllers/smart_contract_controller.ex
index b9398ca056..70ec6219f3 100644
--- a/apps/block_scout_web/lib/block_scout_web/controllers/smart_contract_controller.ex
+++ b/apps/block_scout_web/lib/block_scout_web/controllers/smart_contract_controller.ex
@@ -33,6 +33,7 @@ defmodule BlockScoutWeb.SmartContractController do
   def show(conn, params) do
     with true <- ajax?(conn),
          {:ok, address_hash} <- Chain.string_to_address_hash(params["id"]),
+         {:ok, _address} <- Chain.find_contract_address(address_hash),
          outputs =
            Reader.query_function(
              address_hash,
diff --git a/apps/block_scout_web/lib/block_scout_web/controllers/transaction_log_controller.ex b/apps/block_scout_web/lib/block_scout_web/controllers/transaction_log_controller.ex
index 421c0c38de..be3567f47c 100644
--- a/apps/block_scout_web/lib/block_scout_web/controllers/transaction_log_controller.ex
+++ b/apps/block_scout_web/lib/block_scout_web/controllers/transaction_log_controller.ex
@@ -13,6 +13,7 @@ defmodule BlockScoutWeb.TransactionLogController do
              transaction_hash,
              necessity_by_association: %{
                :block => :optional,
+               [created_contract_address: :names] => :optional,
                [from_address: :names] => :required,
                [to_address: :names] => :optional,
                :token_transfers => :optional
diff --git a/apps/block_scout_web/lib/block_scout_web/notifier.ex b/apps/block_scout_web/lib/block_scout_web/notifier.ex
index 023adfb87a..a67012b75e 100644
--- a/apps/block_scout_web/lib/block_scout_web/notifier.ex
+++ b/apps/block_scout_web/lib/block_scout_web/notifier.ex
@@ -4,7 +4,7 @@ defmodule BlockScoutWeb.Notifier do
   """
 
   alias Explorer.{Chain, Market, Repo}
-  alias Explorer.Chain.{Address, InternalTransaction}
+  alias Explorer.Chain.{Address, InternalTransaction, Transaction}
   alias Explorer.ExchangeRates.Token
   alias BlockScoutWeb.Endpoint
 
@@ -49,7 +49,7 @@ defmodule BlockScoutWeb.Notifier do
     transaction_hashes
     |> Chain.hashes_to_transactions(
       necessity_by_association: %{
-        :block => :required,
+        :block => :optional,
         [created_contract_address: :names] => :optional,
         [from_address: :names] => :optional,
         [to_address: :names] => :optional,
@@ -93,6 +93,12 @@ defmodule BlockScoutWeb.Notifier do
     end
   end
 
+  defp broadcast_transaction(%Transaction{block_number: nil} = pending) do
+    Endpoint.broadcast("transactions:new_pending_transaction", "new_pending_transaction", %{
+      transaction: pending
+    })
+  end
+
   defp broadcast_transaction(transaction) do
     Endpoint.broadcast("transactions:new_transaction", "new_transaction", %{
       transaction: transaction
diff --git a/apps/block_scout_web/lib/block_scout_web/router.ex b/apps/block_scout_web/lib/block_scout_web/router.ex
index 0eef001ade..93e6532cd3 100644
--- a/apps/block_scout_web/lib/block_scout_web/router.ex
+++ b/apps/block_scout_web/lib/block_scout_web/router.ex
@@ -40,7 +40,7 @@ defmodule BlockScoutWeb.Router do
 
     resources("/", ChainController, only: [:show], singleton: true, as: :chain)
 
-    resources "/blocks", BlockController, only: [:index, :show] do
+    resources "/blocks", BlockController, only: [:index, :show], param: "hash_or_number" do
       resources("/transactions", BlockTransactionController, only: [:index], as: :transaction)
     end
 
diff --git a/apps/block_scout_web/lib/block_scout_web/templates/address/_balance_card.html.eex b/apps/block_scout_web/lib/block_scout_web/templates/address/_balance_card.html.eex
index 4d1ed942ae..fb4a6fd400 100644
--- a/apps/block_scout_web/lib/block_scout_web/templates/address/_balance_card.html.eex
+++ b/apps/block_scout_web/lib/block_scout_web/templates/address/_balance_card.html.eex
@@ -1,4 +1,4 @@
-<div class="card card-primary">
+<div class="card card-primary" data-test="outside_of_dropdown">
   <div class="card-body">
     <h2 class="card-title text-white"><%= gettext "Balance" %></h2>
     <span></span>
diff --git a/apps/block_scout_web/lib/block_scout_web/templates/address/overview.html.eex b/apps/block_scout_web/lib/block_scout_web/templates/address/overview.html.eex
index aef2b60213..ef8b5cd66c 100644
--- a/apps/block_scout_web/lib/block_scout_web/templates/address/overview.html.eex
+++ b/apps/block_scout_web/lib/block_scout_web/templates/address/overview.html.eex
@@ -32,24 +32,24 @@
                 <%= link(token_title(@address.token), to: token_path(@conn, :show, @address.hash), "data-test": "token_hash_link" ) %>
               </span>
             <% end %>
-            <%= if contract?(@address) do %>
-              <span data-test="address_contract_creator">
-                <%= gettext "Contract created by" %>
-                <%= link(
-                  trimmed_hash(@address.contracts_creation_internal_transaction.from_address_hash),
-                  to: address_path(@conn, :show, @address.contracts_creation_internal_transaction.from_address_hash)
-                ) %>
+          </div>
+          <%= if contract?(@address) do %>
+            <span class="text-muted" data-test="address_contract_creator">
+              <%= gettext "Created by" %>
+              <%= link(
+                trimmed_hash(@address.contracts_creation_internal_transaction.from_address_hash),
+                to: address_path(@conn, :show, @address.contracts_creation_internal_transaction.from_address_hash)
+              ) %>
 
-                <%= gettext "at" %>
+              <%= gettext "at" %>
 
-                <%= link(
-                  trimmed_hash(@address.contracts_creation_internal_transaction.transaction_hash),
-                  to: transaction_path(@conn, :show, @address.contracts_creation_internal_transaction.transaction_hash),
-                  "data-test": "transaction_hash_link"
-                ) %>
-              </span>
-            <% end %>
-          </div>
+              <%= link(
+                trimmed_hash(@address.contracts_creation_internal_transaction.transaction_hash),
+                to: transaction_path(@conn, :show, @address.contracts_creation_internal_transaction.transaction_hash),
+                "data-test": "transaction_hash_link"
+              ) %>
+            </span>
+          <% end %>
         </div>
       </div>
     </div>
diff --git a/apps/block_scout_web/lib/block_scout_web/templates/address_contract/index.html.eex b/apps/block_scout_web/lib/block_scout_web/templates/address_contract/index.html.eex
index 1a62b895f5..f8378f477d 100644
--- a/apps/block_scout_web/lib/block_scout_web/templates/address_contract/index.html.eex
+++ b/apps/block_scout_web/lib/block_scout_web/templates/address_contract/index.html.eex
@@ -35,12 +35,12 @@
               class: "nav-link active") do %>
             <%= gettext("Code") %>
 
-            <%= if smart_contract_verified?(@address) do %>
+            <%= if BlockScoutWeb.AddressView.smart_contract_verified?(@address) do %>
               <i class="far fa-check-circle"></i>
             <% end %>
           <% end %>
         </li>
-        <%= if smart_contract_with_read_only_functions?(@address) do %>
+        <%= if BlockScoutWeb.AddressView.smart_contract_with_read_only_functions?(@address) do %>
           <li class="nav-item">
             <%= link(
                 gettext("Read Contract"),
@@ -56,7 +56,7 @@
           <a class="nav-link active dropdown-toggle" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">
             <%= gettext("Code") %>
 
-            <%= if smart_contract_verified?(@address) do %>
+            <%= if BlockScoutWeb.AddressView.smart_contract_verified?(@address) do %>
               <i class="far fa-check-circle"></i>
             <% end %>
           </a>
@@ -82,11 +82,11 @@
                 class: "dropdown-item active") do %>
               <%= gettext("Code") %>
 
-              <%= if smart_contract_verified?(@address) do %>
+              <%= if BlockScoutWeb.AddressView.smart_contract_verified?(@address) do %>
                 <i class="far fa-check-circle"></i>
               <% end %>
             <% end %>
-            <%= if smart_contract_with_read_only_functions?(@address) do %>
+            <%= if BlockScoutWeb.AddressView.smart_contract_with_read_only_functions?(@address) do %>
               <%= link(
                   gettext("Read Contract"),
                   to: address_read_contract_path(@conn, :index, @address.hash),
@@ -98,7 +98,7 @@
     </div>
 
     <div class="card-body">
-      <%= if !smart_contract_verified?(@address) do %>
+      <%= if !BlockScoutWeb.AddressView.smart_contract_verified?(@address) do %>
         <%= link(
               gettext("Verify & Publish"),
               to: address_verify_contract_path(@conn, :new, @address.hash),
@@ -107,7 +107,7 @@
             ) %>
       <% end %>
 
-      <%= if smart_contract_verified?(@address) do %>
+      <%= if BlockScoutWeb.AddressView.smart_contract_verified?(@address) do %>
         <div class="mb-4">
           <dl class="row">
             <dt class="col-sm-4 col-md-2 text-muted"><%= gettext "Contract name:" %></dt>
@@ -115,7 +115,7 @@
           </dl>
           <dl class="row">
             <dt class="col-sm-4 col-md-2 text-muted"><%= gettext "Optimization enabled" %></dt>
-            <dd class="col-sm-8 col-md-10"><%= format_optimization(@address.smart_contract.optimization) %></dd>
+            <dd class="col-sm-8 col-md-10"><%= gettext("%{}", @address.smart_contract.optimization) %></dd>
           </dl>
           <dl class="row">
             <dt class="col-sm-4 col-md-2 text-muted"><%= gettext "Compiler version" %></dt>
diff --git a/apps/block_scout_web/lib/block_scout_web/templates/address_token_balance/_token_balances.html.eex b/apps/block_scout_web/lib/block_scout_web/templates/address_token_balance/_token_balances.html.eex
index c3d5883c6f..6551497b48 100644
--- a/apps/block_scout_web/lib/block_scout_web/templates/address_token_balance/_token_balances.html.eex
+++ b/apps/block_scout_web/lib/block_scout_web/templates/address_token_balance/_token_balances.html.eex
@@ -16,6 +16,16 @@
 
 <div class="dropdown-menu dropdown-menu-right token-balance-dropdown p-0" aria-labelledby="dropdown-tokens">
   <div data-dropdown-items class="dropdown-items">
+    <div class="m-3 position-relative">
+      <i class="fas fa-search position-absolute dropdown-search-icon"></i>
+      <%= text_input(
+            :token_search,
+            :name,
+            class: "w-100 dropdown-search-field",
+            'data-filter-dropdown-tokens': true,
+            placeholder: gettext("Search tokens")
+          ) %>
+    </div>
     <%= if Enum.any?(@token_balances, & &1.token.type == "ERC-721") do %>
       <%= render(
             "_tokens.html",
diff --git a/apps/block_scout_web/lib/block_scout_web/templates/address_token_balance/_tokens.html.eex b/apps/block_scout_web/lib/block_scout_web/templates/address_token_balance/_tokens.html.eex
index d3e7441846..27a2f80a18 100644
--- a/apps/block_scout_web/lib/block_scout_web/templates/address_token_balance/_tokens.html.eex
+++ b/apps/block_scout_web/lib/block_scout_web/templates/address_token_balance/_tokens.html.eex
@@ -1,16 +1,24 @@
-<h6 class="dropdown-header">
-  <%= @type %> (<%= Enum.count(@token_balances)%>)
-</h6>
-<%= for token_balance <- sort_by_name(@token_balances) do %>
-  <div class="border-bottom">
-    <%= link(
-          to: token_path(@conn, :show, token_balance.token.contract_address_hash),
-          class: "dropdown-item"
-        ) do %>
-      <p class="mb-0"><%= token_name(token_balance.token) %></p>
-      <p class="mb-0">
-        <%= format_according_to_decimals(token_balance.value, token_balance.token.decimals) %> <%= token_balance.token.symbol %>
-      </p>
-    <% end %>
-  </div>
-<% end %>
+<div data-token-type="<%= @type %>">
+  <h6 class="dropdown-header">
+    <%= @type %> (<span data-number-of-tokens-by-type="<%= @type %>"><%= Enum.count(@token_balances)%></span>)
+  </h6>
+
+  <%= for token_balance <- sort_by_name(@token_balances) do %>
+    <div
+      class="border-bottom"
+      data-dropdown-token-balance-test
+      data-token-name="<%= token_name(token_balance.token) %>"
+      data-token-symbol="<%= token_balance.token.symbol %>"
+    >
+      <%= link(
+            to: token_path(@conn, :show, token_balance.token.contract_address_hash),
+            class: "dropdown-item"
+          ) do %>
+        <p class="mb-0"><%= token_name(token_balance.token) %></p>
+        <p class="mb-0">
+          <%= format_according_to_decimals(token_balance.value, token_balance.token.decimals) %> <%= token_balance.token.symbol %>
+        </p>
+      <% end %>
+    </div>
+  <% end %>
+</div>
diff --git a/apps/block_scout_web/lib/block_scout_web/templates/block_transaction/index.html.eex b/apps/block_scout_web/lib/block_scout_web/templates/block_transaction/index.html.eex
index 811b2c99df..98b4a8d98a 100644
--- a/apps/block_scout_web/lib/block_scout_web/templates/block_transaction/index.html.eex
+++ b/apps/block_scout_web/lib/block_scout_web/templates/block_transaction/index.html.eex
@@ -12,7 +12,7 @@
             <%= link(
                   gettext("Transactions"),
                   class: "nav-link active",
-                  to: block_transaction_path(@conn, :index, @conn.params["block_id"])
+                  to: block_transaction_path(@conn, :index, @conn.params["block_hash_or_number"])
                 ) %>
           </li>
         </ul>
@@ -25,7 +25,7 @@
               <%= link(
                     gettext("Transactions"),
                     class: "dropdown-item active",
-                    to: block_transaction_path(@conn, :index, @conn.params["block_id"])
+                    to: block_transaction_path(@conn, :index, @conn.params["block_hash_or_number"])
                   ) %>
             </div>
           </li>
diff --git a/apps/block_scout_web/lib/block_scout_web/templates/layout/app.html.eex b/apps/block_scout_web/lib/block_scout_web/templates/layout/app.html.eex
index a2cea8f5da..3a1f9d0376 100644
--- a/apps/block_scout_web/lib/block_scout_web/templates/layout/app.html.eex
+++ b/apps/block_scout_web/lib/block_scout_web/templates/layout/app.html.eex
@@ -6,6 +6,16 @@
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <title><%= gettext "BlockScout" %></title>
     <link rel="stylesheet" href="<%= static_path(@conn, "/css/app.css") %>">
+
+    <link rel="apple-touch-icon" sizes="180x180" href="<%= static_path(@conn, "/apple-touch-icon.png") %>">
+    <link rel="icon" type="image/png" sizes="32x32" href="<%= static_path(@conn, "/favicon-32x32.png") %>">
+    <link rel="icon" type="image/png" sizes="16x16" href="<%= static_path(@conn, "/favicon-16x16.png") %>">
+    <link rel="manifest" href="<%= static_path(@conn, "/site.webmanifest") %>">
+    <link rel="mask-icon" href="<%= static_path(@conn, "/safari-pinned-tab.svg") %>" color="#5bbad5">
+    <link rel="shortcut icon" href="<%= static_path(@conn, "/favicon.ico") %>">
+    <meta name="msapplication-TileColor" content="#7dd79f">
+    <meta name="msapplication-config" content="<%= static_path(@conn, "/browserconfig.xml") %>">
+    <meta name="theme-color" content="#ffffff">
   </head>
 
   <body>
diff --git a/apps/block_scout_web/lib/block_scout_web/templates/pending_transaction/index.html.eex b/apps/block_scout_web/lib/block_scout_web/templates/pending_transaction/index.html.eex
index 7a37f3d93b..4990a69919 100644
--- a/apps/block_scout_web/lib/block_scout_web/templates/pending_transaction/index.html.eex
+++ b/apps/block_scout_web/lib/block_scout_web/templates/pending_transaction/index.html.eex
@@ -1,4 +1,4 @@
-<section class="container">
+<section class="container" data-page="transaction-pending-list">
   <div class="card">
     <div class="card-header">
 
@@ -43,36 +43,28 @@
     </div>
 
     <div class="card-body">
+      <div data-selector="channel-batching-message" style="display:none;">
+        <div data-selector="reload-button" class="alert alert-info">
+          <a href="#" class="alert-link"><span data-selector="channel-batching-count"></span> <%= gettext "More transactions have come in" %></a>
+        </div>
+      </div>
+      <div data-selector="channel-disconnected-message" style="display:none;">
+        <div data-selector="reload-button" class="alert alert-danger">
+          <a href="#" class="alert-link"><%= gettext "Connection Lost, click to load newer transactions" %></a>
+        </div>
+      </div>
       <h2 class="card-title mb-0"><%= gettext "Transactions" %></h2>
-      <p><%= gettext("Showing %{count} Pending Transactions", count: @pending_transaction_count) %></p>
-
-      <%= for transaction <- @transactions do %>
-        <div class="tile tile-type-<%= BlockScoutWeb.TransactionView.type_suffix(transaction) %>" data-test="<%= BlockScoutWeb.TransactionView.type_suffix(transaction) %>" data-transaction-hash="<%= transaction.hash %>">
-          <div class="row" data-test="chain_transaction">
-            <div class="col-md-2 d-flex flex-row flex-md-column align-items-left justify-content-start justify-content-lg-center mb-1 mb-md-0 pl-md-4">
-              <span class="tile-label" data-test="transaction_type"> <%= BlockScoutWeb.TransactionView.transaction_display_type(transaction) %></span>
-              <div class="tile-status-label ml-2 ml-md-0" data-test="transaction_status"><%= BlockScoutWeb.TransactionView.formatted_status(transaction) %></div>
-            </div>
-            <div class="col-md-7 col-lg-8 d-flex flex-column pr-2 pr-sm-2 pr-md-0">
-              <%= render BlockScoutWeb.TransactionView, "_link.html", transaction_hash: transaction.hash %>
-              <span class="text-nowrap">
-                <%= render BlockScoutWeb.AddressView, "_link.html", address: transaction.from_address, contract: BlockScoutWeb.AddressView.contract?(transaction.from_address) %>
-                &rarr;
-                <%= if transaction.to_address_hash do %>
-                  <%= render BlockScoutWeb.AddressView, "_link.html", address: transaction.to_address, contract: BlockScoutWeb.AddressView.contract?(transaction.to_address) %>
-                <% else %>
-                  <%= gettext("Contract Address Pending") %>
-                <% end %>
-              </span>
-              <span class="d-flex flex-md-row flex-column mt-3 mt-md-0">
-                <span class="tile-title"><%= BlockScoutWeb.TransactionView.value(transaction, include_label: false) %> <%= gettext "Ether" %></span>
-                <span class="ml-0 ml-md-1 text-nowrap"> <%= BlockScoutWeb.TransactionView.formatted_fee(transaction, denomination: :ether, include_label: false) %> <%= gettext "TX Fee" %></span>
-              </span>
+      <p>
+        <%= gettext("Showing") %>
+        <span data-selector="transaction-pending-count"><%= Cldr.Number.to_string!(@pending_transaction_count, format: "#,###") %></span>
+        <%= gettext("Pending Transactions") %>
+      </p>
+      <span data-selector="transactions-pending-list">
+        <%= for transaction <- @transactions do %>
+          <%= render BlockScoutWeb.TransactionView, "_pending_tile.html", transaction: transaction %>
+        <% end %>
+      </span>
 
-            </div>
-          </div>
-        </div>
-      <% end %>
       <%= if @next_page_params do %>
         <%= link(
           gettext("Older"),
diff --git a/apps/block_scout_web/lib/block_scout_web/templates/transaction/_pending_tile.html.eex b/apps/block_scout_web/lib/block_scout_web/templates/transaction/_pending_tile.html.eex
new file mode 100644
index 0000000000..d92872e2a5
--- /dev/null
+++ b/apps/block_scout_web/lib/block_scout_web/templates/transaction/_pending_tile.html.eex
@@ -0,0 +1,24 @@
+<div class="tile tile-type-<%= BlockScoutWeb.TransactionView.type_suffix(@transaction) %> fade-in" data-test="<%= BlockScoutWeb.TransactionView.type_suffix(@transaction) %>" data-transaction-hash="<%= @transaction.hash %>">
+  <div class="row" data-test="chain_transaction">
+    <div class="col-md-2 d-flex flex-row flex-md-column align-items-left justify-content-start justify-content-lg-center mb-1 mb-md-0 pl-md-4">
+      <span class="tile-label" data-test="transaction_type"> <%= BlockScoutWeb.TransactionView.transaction_display_type(@transaction) %></span>
+      <div class="tile-status-label ml-2 ml-md-0" data-test="transaction_status"><%= BlockScoutWeb.TransactionView.formatted_status(@transaction) %></div>
+    </div>
+    <div class="col-md-7 col-lg-8 d-flex flex-column pr-2 pr-sm-2 pr-md-0">
+      <%= render BlockScoutWeb.TransactionView, "_link.html", transaction_hash: @transaction.hash %>
+      <span class="text-nowrap">
+        <%= render BlockScoutWeb.AddressView, "_link.html", address: @transaction.from_address, contract: BlockScoutWeb.AddressView.contract?(@transaction.from_address) %>
+        &rarr;
+        <%= if @transaction.to_address_hash do %>
+          <%= render BlockScoutWeb.AddressView, "_link.html", address: @transaction.to_address, contract: BlockScoutWeb.AddressView.contract?(@transaction.to_address) %>
+        <% else %>
+          <%= gettext("Contract Address Pending") %>
+        <% end %>
+      </span>
+      <span class="d-flex flex-md-row flex-column mt-3 mt-md-0">
+        <span class="tile-title"><%= BlockScoutWeb.TransactionView.value(@transaction, include_label: false) %> <%= gettext "Ether" %></span>
+        <span class="ml-0 ml-md-1 text-nowrap"> <%= BlockScoutWeb.TransactionView.formatted_fee(@transaction, denomination: :ether, include_label: false) %> <%= gettext "TX Fee" %></span>
+      </span>
+    </div>
+  </div>
+</div>
diff --git a/apps/block_scout_web/lib/block_scout_web/templates/transaction/_tile.html.eex b/apps/block_scout_web/lib/block_scout_web/templates/transaction/_tile.html.eex
index 778824848f..fb5b733494 100644
--- a/apps/block_scout_web/lib/block_scout_web/templates/transaction/_tile.html.eex
+++ b/apps/block_scout_web/lib/block_scout_web/templates/transaction/_tile.html.eex
@@ -51,7 +51,7 @@
       <div class="offset-md-2 col-md-10 col-lg-8 d-flex flex-column mt-2 mb-2">
         <% [first_token_transfer | remaining_token_transfers]= @transaction.token_transfers %>
         <%= render "_token_transfer.html", address: assigns[:current_address], token_transfer: first_token_transfer %>
-        <div class="collapse token-transfer-toggle" id="<%= @transaction.hash %>">
+        <div class="collapse token-transfer-toggle" id="transaction-<%= @transaction.hash %>">
           <%= for token_transfer <- remaining_token_transfers do %>
             <%= render "_token_transfer.html", address: assigns[:current_address], token_transfer: token_transfer %>
           <% end %>
@@ -60,8 +60,8 @@
       <%= if Enum.any?(remaining_token_transfers) do %>
         <div class="col-md-12 d-flex flex-column mt-1 mb-2 text-center token-tile-view-more">
           <span class="token-tile-more-lines">
-            <%= link gettext("View More Transfers"), to: "##{@transaction.hash}", "data-toggle": "collapse", "data-selector": "token-transfer-open", "data-test": "token_transfers_expansion" %>
-            <%= link gettext("View Less Transfers"), class: "d-none", to: "##{@transaction.hash}", "data-toggle": "collapse", "data-selector": "token-transfer-close" %>
+            <%= link gettext("View More Transfers"), to: "#transaction-#{@transaction.hash}", "data-toggle": "collapse", "data-selector": "token-transfer-open", "data-test": "token_transfers_expansion" %>
+            <%= link gettext("View Less Transfers"), class: "d-none", to: "#transaction-#{@transaction.hash}", "data-toggle": "collapse", "data-selector": "token-transfer-close" %>
           </span>
         </div>
       <% end %>
diff --git a/apps/block_scout_web/lib/block_scout_web/templates/transaction/index.html.eex b/apps/block_scout_web/lib/block_scout_web/templates/transaction/index.html.eex
index 0d82093f03..6ed329392e 100644
--- a/apps/block_scout_web/lib/block_scout_web/templates/transaction/index.html.eex
+++ b/apps/block_scout_web/lib/block_scout_web/templates/transaction/index.html.eex
@@ -54,7 +54,11 @@
         </div>
       </div>
       <h1><%= gettext "Transactions" %></h1>
-      <p><%= gettext("Showing") %> <span data-selector="transaction-count"><%= Cldr.Number.to_string!(@transaction_estimated_count, format: "#,###") %></span> <%= gettext("Validated Transactions") %></p>
+      <p>
+        <%= gettext("Showing") %>
+        <span data-selector="transaction-count"><%= Cldr.Number.to_string!(@transaction_estimated_count, format: "#,###") %></span>
+        <%= gettext("Validated Transactions") %>
+      </p>
       <span data-selector="transactions-list">
         <%= for transaction <- @transactions do %>
           <%= render BlockScoutWeb.TransactionView, "_tile.html", transaction: transaction %>
diff --git a/apps/block_scout_web/lib/block_scout_web/views/address_contract_view.ex b/apps/block_scout_web/lib/block_scout_web/views/address_contract_view.ex
index 4e95641454..3f453e0478 100644
--- a/apps/block_scout_web/lib/block_scout_web/views/address_contract_view.ex
+++ b/apps/block_scout_web/lib/block_scout_web/views/address_contract_view.ex
@@ -1,10 +1,5 @@
 defmodule BlockScoutWeb.AddressContractView do
   use BlockScoutWeb, :view
 
-  import BlockScoutWeb.AddressView, only: [smart_contract_verified?: 1, smart_contract_with_read_only_functions?: 1]
-
   def format_smart_contract_abi(abi), do: Poison.encode!(abi, pretty: false)
-
-  def format_optimization(true), do: gettext("true")
-  def format_optimization(false), do: gettext("false")
 end
diff --git a/apps/block_scout_web/lib/block_scout_web/views/transaction_view.ex b/apps/block_scout_web/lib/block_scout_web/views/transaction_view.ex
index 7a7637fa57..1da0d7e2eb 100644
--- a/apps/block_scout_web/lib/block_scout_web/views/transaction_view.ex
+++ b/apps/block_scout_web/lib/block_scout_web/views/transaction_view.ex
@@ -25,10 +25,6 @@ defmodule BlockScoutWeb.TransactionView do
 
   def contract_creation?(_), do: false
 
-  def to_address(%Transaction{to_address: nil, created_contract_address: %Address{} = address}), do: address
-
-  def to_address(%Transaction{to_address: %Address{} = address}), do: address
-
   def fee(%Transaction{} = transaction) do
     {_, value} = Chain.fee(transaction, :wei)
     value
diff --git a/apps/block_scout_web/lib/phoenix/param.ex b/apps/block_scout_web/lib/phoenix/param.ex
index 7abe4d1d42..f1968f40c9 100644
--- a/apps/block_scout_web/lib/phoenix/param.ex
+++ b/apps/block_scout_web/lib/phoenix/param.ex
@@ -7,9 +7,13 @@ defimpl Phoenix.Param, for: [Address, Transaction] do
 end
 
 defimpl Phoenix.Param, for: Block do
-  def to_param(%@for{number: number}) do
+  def to_param(%@for{consensus: true, number: number}) do
     to_string(number)
   end
+
+  def to_param(%@for{consensus: false, hash: hash}) do
+    to_string(hash)
+  end
 end
 
 defimpl Phoenix.Param, for: Hash do
diff --git a/apps/block_scout_web/priv/gettext/default.pot b/apps/block_scout_web/priv/gettext/default.pot
index 1db4c0cfb7..ddac06d944 100644
--- a/apps/block_scout_web/priv/gettext/default.pot
+++ b/apps/block_scout_web/priv/gettext/default.pot
@@ -55,7 +55,7 @@ msgstr ""
 #: lib/block_scout_web/templates/block_transaction/index.html.eex:36
 #: lib/block_scout_web/templates/chain/show.html.eex:73
 #: lib/block_scout_web/templates/layout/_topnav.html.eex:24
-#: lib/block_scout_web/templates/pending_transaction/index.html.eex:46
+#: lib/block_scout_web/templates/pending_transaction/index.html.eex:56
 #: lib/block_scout_web/templates/transaction/index.html.eex:56
 msgid "Transactions"
 msgstr ""
@@ -157,7 +157,7 @@ msgstr ""
 msgid "Overview"
 msgstr ""
 
-#: lib/block_scout_web/views/transaction_view.ex:57
+#: lib/block_scout_web/views/transaction_view.ex:53
 msgid "Success"
 msgstr ""
 
@@ -209,8 +209,8 @@ msgstr ""
 #: lib/block_scout_web/templates/transaction/index.html.eex:16
 #: lib/block_scout_web/templates/transaction/index.html.eex:35
 #: lib/block_scout_web/templates/transaction/overview.html.eex:54
-#: lib/block_scout_web/views/transaction_view.ex:55
-#: lib/block_scout_web/views/transaction_view.ex:81
+#: lib/block_scout_web/views/transaction_view.ex:51
+#: lib/block_scout_web/views/transaction_view.ex:77
 msgid "Pending"
 msgstr ""
 
@@ -225,7 +225,7 @@ msgstr ""
 #: lib/block_scout_web/templates/transaction/_tabs.html.eex:21
 #: lib/block_scout_web/templates/transaction/_tabs.html.eex:48
 #: lib/block_scout_web/templates/transaction_log/index.html.eex:10
-#: lib/block_scout_web/views/transaction_view.ex:175
+#: lib/block_scout_web/views/transaction_view.ex:171
 msgid "Logs"
 msgstr ""
 
@@ -294,7 +294,7 @@ msgid "Showing #%{number}"
 msgstr ""
 
 #: lib/block_scout_web/templates/internal_transaction/_tile.html.eex:15
-#: lib/block_scout_web/templates/pending_transaction/index.html.eex:68
+#: lib/block_scout_web/templates/transaction/_pending_tile.html.eex:19
 #: lib/block_scout_web/templates/transaction/_tile.html.eex:20
 #: lib/block_scout_web/templates/transaction/overview.html.eex:98
 #: lib/block_scout_web/views/wei_helpers.ex:72
@@ -323,7 +323,7 @@ msgstr ""
 #: lib/block_scout_web/templates/transaction/_tabs.html.eex:14
 #: lib/block_scout_web/templates/transaction/_tabs.html.eex:43
 #: lib/block_scout_web/templates/transaction_internal_transaction/index.html.eex:10
-#: lib/block_scout_web/views/transaction_view.ex:174
+#: lib/block_scout_web/views/transaction_view.ex:170
 msgid "Internal Transactions"
 msgstr ""
 
@@ -399,13 +399,13 @@ msgid "Avg Block Time"
 msgstr ""
 
 #: lib/block_scout_web/templates/chain/show.html.eex:17
-#: lib/block_scout_web/templates/layout/app.html.eex:24
+#: lib/block_scout_web/templates/layout/app.html.eex:34
 #: lib/block_scout_web/views/address_view.ex:99
 msgid "Market Cap"
 msgstr ""
 
 #: lib/block_scout_web/templates/chain/show.html.eex:10
-#: lib/block_scout_web/templates/layout/app.html.eex:25
+#: lib/block_scout_web/templates/layout/app.html.eex:35
 msgid "Price"
 msgstr ""
 
@@ -464,7 +464,7 @@ msgstr ""
 msgid "Total Gas Used"
 msgstr ""
 
-#: lib/block_scout_web/views/transaction_view.ex:126
+#: lib/block_scout_web/views/transaction_view.ex:122
 msgid "Transaction"
 msgstr ""
 
@@ -477,7 +477,7 @@ msgstr ""
 msgid "View All"
 msgstr ""
 
-#: lib/block_scout_web/templates/pending_transaction/index.html.eex:69
+#: lib/block_scout_web/templates/transaction/_pending_tile.html.eex:20
 #: lib/block_scout_web/templates/transaction/_tile.html.eex:23
 #: lib/block_scout_web/templates/transaction/overview.html.eex:71
 msgid "TX Fee"
@@ -504,9 +504,9 @@ msgstr ""
 #: lib/block_scout_web/templates/address_transaction/index.html.eex:162
 #: lib/block_scout_web/templates/block/index.html.eex:20
 #: lib/block_scout_web/templates/block_transaction/index.html.eex:50
-#: lib/block_scout_web/templates/pending_transaction/index.html.eex:78
+#: lib/block_scout_web/templates/pending_transaction/index.html.eex:70
 #: lib/block_scout_web/templates/tokens/transfer/index.html.eex:34
-#: lib/block_scout_web/templates/transaction/index.html.eex:66
+#: lib/block_scout_web/templates/transaction/index.html.eex:70
 #: lib/block_scout_web/templates/transaction_token_transfer/index.html.eex:24
 msgid "Older"
 msgstr ""
@@ -565,7 +565,7 @@ msgid "Newer"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/views/transaction_view.ex:124
+#: lib/block_scout_web/views/transaction_view.ex:120
 msgid "Contract Creation"
 msgstr ""
 
@@ -617,6 +617,7 @@ msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/address_transaction/index.html.eex:108
+#: lib/block_scout_web/templates/pending_transaction/index.html.eex:53
 #: lib/block_scout_web/templates/transaction/index.html.eex:53
 msgid "Connection Lost, click to load newer transactions"
 msgstr ""
@@ -655,24 +656,19 @@ msgid "There are no transactions for this address."
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/pending_transaction/index.html.eex:64
+#: lib/block_scout_web/templates/transaction/_pending_tile.html.eex:15
 #: lib/block_scout_web/views/address_view.ex:21
 #: lib/block_scout_web/views/address_view.ex:55
 msgid "Contract Address Pending"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/views/transaction_view.ex:125
+#: lib/block_scout_web/views/transaction_view.ex:121
 msgid "Contract Call"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address/overview.html.eex:37
-msgid "Contract created by"
-msgstr ""
-
-#, elixir-format
-#: lib/block_scout_web/templates/address/overview.html.eex:43
+#: lib/block_scout_web/templates/address/overview.html.eex:44
 msgid "at"
 msgstr ""
 
@@ -774,7 +770,7 @@ msgstr ""
 #, elixir-format
 #: lib/block_scout_web/templates/tokens/transfer/_token_transfer.html.eex:4
 #: lib/block_scout_web/templates/transaction_token_transfer/_token_transfer.html.eex:4
-#: lib/block_scout_web/views/transaction_view.ex:123
+#: lib/block_scout_web/views/transaction_view.ex:119
 msgid "Token Transfer"
 msgstr ""
 
@@ -793,17 +789,19 @@ msgstr[1] ""
 #, elixir-format
 #: lib/block_scout_web/templates/address_transaction/index.html.eex:103
 #: lib/block_scout_web/templates/chain/show.html.eex:69
+#: lib/block_scout_web/templates/pending_transaction/index.html.eex:48
 #: lib/block_scout_web/templates/transaction/index.html.eex:48
 msgid "More transactions have come in"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/transaction/index.html.eex:57
+#: lib/block_scout_web/templates/pending_transaction/index.html.eex:58
+#: lib/block_scout_web/templates/transaction/index.html.eex:58
 msgid "Showing"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/transaction/index.html.eex:57
+#: lib/block_scout_web/templates/transaction/index.html.eex:60
 msgid "Validated Transactions"
 msgstr ""
 
@@ -824,7 +822,7 @@ msgstr ""
 #: lib/block_scout_web/templates/transaction/_tabs.html.eex:36
 #: lib/block_scout_web/templates/transaction_token_transfer/index.html.eex:10
 #: lib/block_scout_web/views/tokens/overview_view.ex:34
-#: lib/block_scout_web/views/transaction_view.ex:173
+#: lib/block_scout_web/views/transaction_view.ex:169
 msgid "Token Transfers"
 msgstr ""
 
@@ -1038,12 +1036,12 @@ msgid "View Less Transfers"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/layout/app.html.eex:23
+#: lib/block_scout_web/templates/layout/app.html.eex:33
 msgid "Less than"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/views/transaction_view.ex:47
+#: lib/block_scout_web/views/transaction_view.ex:43
 msgid "Max of"
 msgstr ""
 
@@ -1200,17 +1198,17 @@ msgid "Connection Lost, click to load newer blocks"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/views/transaction_view.ex:56
+#: lib/block_scout_web/views/transaction_view.ex:52
 msgid "(Awaiting internal transactions for status)"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/views/transaction_view.ex:60
+#: lib/block_scout_web/views/transaction_view.ex:56
 msgid "Error: %{reason}"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/views/transaction_view.ex:58
+#: lib/block_scout_web/views/transaction_view.ex:54
 msgid "Error: (Awaiting internal transactions for reason)"
 msgstr ""
 
@@ -1260,3 +1258,24 @@ msgstr ""
 #: lib/block_scout_web/templates/transaction/overview.html.eex:23
 msgid "This transaction is pending confirmation."
 msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address/overview.html.eex:38
+msgid "Created by"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_contract/index.html.eex:118
+msgid "%{}"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/pending_transaction/index.html.eex:60
+msgid "Pending Transactions"
+msgstr ""
+
+#, elixir-format
+#:
+#: lib/block_scout_web/templates/address_token_balance/_token_balances.html.eex:26
+msgid "Search tokens"
+msgstr ""
diff --git a/apps/block_scout_web/priv/gettext/en/LC_MESSAGES/default.po b/apps/block_scout_web/priv/gettext/en/LC_MESSAGES/default.po
index cacf084173..74e593ef62 100644
--- a/apps/block_scout_web/priv/gettext/en/LC_MESSAGES/default.po
+++ b/apps/block_scout_web/priv/gettext/en/LC_MESSAGES/default.po
@@ -67,7 +67,7 @@ msgstr "BlockScout"
 #: lib/block_scout_web/templates/block_transaction/index.html.eex:36
 #: lib/block_scout_web/templates/chain/show.html.eex:73
 #: lib/block_scout_web/templates/layout/_topnav.html.eex:24
-#: lib/block_scout_web/templates/pending_transaction/index.html.eex:46
+#: lib/block_scout_web/templates/pending_transaction/index.html.eex:56
 #: lib/block_scout_web/templates/transaction/index.html.eex:56
 msgid "Transactions"
 msgstr "Transactions"
@@ -169,7 +169,7 @@ msgstr "From"
 msgid "Overview"
 msgstr "Overview"
 
-#: lib/block_scout_web/views/transaction_view.ex:57
+#: lib/block_scout_web/views/transaction_view.ex:53
 msgid "Success"
 msgstr "Success"
 
@@ -221,8 +221,8 @@ msgstr "Showing %{count} Transactions"
 #: lib/block_scout_web/templates/transaction/index.html.eex:16
 #: lib/block_scout_web/templates/transaction/index.html.eex:35
 #: lib/block_scout_web/templates/transaction/overview.html.eex:54
-#: lib/block_scout_web/views/transaction_view.ex:55
-#: lib/block_scout_web/views/transaction_view.ex:81
+#: lib/block_scout_web/views/transaction_view.ex:51
+#: lib/block_scout_web/views/transaction_view.ex:77
 msgid "Pending"
 msgstr "Pending"
 
@@ -237,7 +237,7 @@ msgstr ""
 #: lib/block_scout_web/templates/transaction/_tabs.html.eex:21
 #: lib/block_scout_web/templates/transaction/_tabs.html.eex:48
 #: lib/block_scout_web/templates/transaction_log/index.html.eex:10
-#: lib/block_scout_web/views/transaction_view.ex:175
+#: lib/block_scout_web/views/transaction_view.ex:171
 msgid "Logs"
 msgstr ""
 
@@ -306,7 +306,7 @@ msgid "Showing #%{number}"
 msgstr ""
 
 #: lib/block_scout_web/templates/internal_transaction/_tile.html.eex:15
-#: lib/block_scout_web/templates/pending_transaction/index.html.eex:68
+#: lib/block_scout_web/templates/transaction/_pending_tile.html.eex:19
 #: lib/block_scout_web/templates/transaction/_tile.html.eex:20
 #: lib/block_scout_web/templates/transaction/overview.html.eex:98
 #: lib/block_scout_web/views/wei_helpers.ex:72
@@ -335,7 +335,7 @@ msgstr ""
 #: lib/block_scout_web/templates/transaction/_tabs.html.eex:14
 #: lib/block_scout_web/templates/transaction/_tabs.html.eex:43
 #: lib/block_scout_web/templates/transaction_internal_transaction/index.html.eex:10
-#: lib/block_scout_web/views/transaction_view.ex:174
+#: lib/block_scout_web/views/transaction_view.ex:170
 msgid "Internal Transactions"
 msgstr ""
 
@@ -411,13 +411,13 @@ msgid "Avg Block Time"
 msgstr ""
 
 #: lib/block_scout_web/templates/chain/show.html.eex:17
-#: lib/block_scout_web/templates/layout/app.html.eex:24
+#: lib/block_scout_web/templates/layout/app.html.eex:34
 #: lib/block_scout_web/views/address_view.ex:99
 msgid "Market Cap"
 msgstr ""
 
 #: lib/block_scout_web/templates/chain/show.html.eex:10
-#: lib/block_scout_web/templates/layout/app.html.eex:25
+#: lib/block_scout_web/templates/layout/app.html.eex:35
 msgid "Price"
 msgstr ""
 
@@ -476,7 +476,7 @@ msgstr ""
 msgid "Total Gas Used"
 msgstr ""
 
-#: lib/block_scout_web/views/transaction_view.ex:126
+#: lib/block_scout_web/views/transaction_view.ex:122
 msgid "Transaction"
 msgstr ""
 
@@ -489,7 +489,7 @@ msgstr ""
 msgid "View All"
 msgstr ""
 
-#: lib/block_scout_web/templates/pending_transaction/index.html.eex:69
+#: lib/block_scout_web/templates/transaction/_pending_tile.html.eex:20
 #: lib/block_scout_web/templates/transaction/_tile.html.eex:23
 #: lib/block_scout_web/templates/transaction/overview.html.eex:71
 msgid "TX Fee"
@@ -516,9 +516,9 @@ msgstr ""
 #: lib/block_scout_web/templates/address_transaction/index.html.eex:162
 #: lib/block_scout_web/templates/block/index.html.eex:20
 #: lib/block_scout_web/templates/block_transaction/index.html.eex:50
-#: lib/block_scout_web/templates/pending_transaction/index.html.eex:78
+#: lib/block_scout_web/templates/pending_transaction/index.html.eex:70
 #: lib/block_scout_web/templates/tokens/transfer/index.html.eex:34
-#: lib/block_scout_web/templates/transaction/index.html.eex:66
+#: lib/block_scout_web/templates/transaction/index.html.eex:70
 #: lib/block_scout_web/templates/transaction_token_transfer/index.html.eex:24
 msgid "Older"
 msgstr ""
@@ -577,7 +577,7 @@ msgid "Newer"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/views/transaction_view.ex:124
+#: lib/block_scout_web/views/transaction_view.ex:120
 msgid "Contract Creation"
 msgstr ""
 
@@ -629,6 +629,7 @@ msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/address_transaction/index.html.eex:108
+#: lib/block_scout_web/templates/pending_transaction/index.html.eex:53
 #: lib/block_scout_web/templates/transaction/index.html.eex:53
 msgid "Connection Lost, click to load newer transactions"
 msgstr ""
@@ -667,24 +668,19 @@ msgid "There are no transactions for this address."
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/pending_transaction/index.html.eex:64
+#: lib/block_scout_web/templates/transaction/_pending_tile.html.eex:15
 #: lib/block_scout_web/views/address_view.ex:21
 #: lib/block_scout_web/views/address_view.ex:55
 msgid "Contract Address Pending"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/views/transaction_view.ex:125
+#: lib/block_scout_web/views/transaction_view.ex:121
 msgid "Contract Call"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address/overview.html.eex:37
-msgid "Contract created by"
-msgstr ""
-
-#, elixir-format
-#: lib/block_scout_web/templates/address/overview.html.eex:43
+#: lib/block_scout_web/templates/address/overview.html.eex:44
 msgid "at"
 msgstr ""
 
@@ -786,7 +782,7 @@ msgstr ""
 #, elixir-format
 #: lib/block_scout_web/templates/tokens/transfer/_token_transfer.html.eex:4
 #: lib/block_scout_web/templates/transaction_token_transfer/_token_transfer.html.eex:4
-#: lib/block_scout_web/views/transaction_view.ex:123
+#: lib/block_scout_web/views/transaction_view.ex:119
 msgid "Token Transfer"
 msgstr ""
 
@@ -805,17 +801,19 @@ msgstr[1] ""
 #, elixir-format
 #: lib/block_scout_web/templates/address_transaction/index.html.eex:103
 #: lib/block_scout_web/templates/chain/show.html.eex:69
+#: lib/block_scout_web/templates/pending_transaction/index.html.eex:48
 #: lib/block_scout_web/templates/transaction/index.html.eex:48
 msgid "More transactions have come in"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/transaction/index.html.eex:57
+#: lib/block_scout_web/templates/pending_transaction/index.html.eex:58
+#: lib/block_scout_web/templates/transaction/index.html.eex:58
 msgid "Showing"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/transaction/index.html.eex:57
+#: lib/block_scout_web/templates/transaction/index.html.eex:60
 msgid "Validated Transactions"
 msgstr ""
 
@@ -836,7 +834,7 @@ msgstr ""
 #: lib/block_scout_web/templates/transaction/_tabs.html.eex:36
 #: lib/block_scout_web/templates/transaction_token_transfer/index.html.eex:10
 #: lib/block_scout_web/views/tokens/overview_view.ex:34
-#: lib/block_scout_web/views/transaction_view.ex:173
+#: lib/block_scout_web/views/transaction_view.ex:169
 msgid "Token Transfers"
 msgstr ""
 
@@ -1050,12 +1048,12 @@ msgid "View Less Transfers"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/layout/app.html.eex:23
+#: lib/block_scout_web/templates/layout/app.html.eex:33
 msgid "Less than"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/views/transaction_view.ex:47
+#: lib/block_scout_web/views/transaction_view.ex:43
 msgid "Max of"
 msgstr ""
 
@@ -1212,17 +1210,17 @@ msgid "Connection Lost, click to load newer blocks"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/views/transaction_view.ex:56
+#: lib/block_scout_web/views/transaction_view.ex:52
 msgid "(Awaiting internal transactions for status)"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/views/transaction_view.ex:60
+#: lib/block_scout_web/views/transaction_view.ex:56
 msgid "Error: %{reason}"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/views/transaction_view.ex:58
+#: lib/block_scout_web/views/transaction_view.ex:54
 msgid "Error: (Awaiting internal transactions for reason)"
 msgstr ""
 
@@ -1272,3 +1270,24 @@ msgstr ""
 #: lib/block_scout_web/templates/transaction/overview.html.eex:23
 msgid "This transaction is pending confirmation."
 msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address/overview.html.eex:38
+msgid "Created by"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_contract/index.html.eex:118
+msgid "%{}"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/pending_transaction/index.html.eex:60
+msgid "Pending Transactions"
+msgstr ""
+
+#, elixir-format
+#:
+#: lib/block_scout_web/templates/address_token_balance/_token_balances.html.eex:26
+msgid "Search tokens"
+msgstr ""
diff --git a/apps/block_scout_web/test/block_scout_web/channels/transaction_channel_test.exs b/apps/block_scout_web/test/block_scout_web/channels/transaction_channel_test.exs
index 69ba3a6493..3335b859d6 100644
--- a/apps/block_scout_web/test/block_scout_web/channels/transaction_channel_test.exs
+++ b/apps/block_scout_web/test/block_scout_web/channels/transaction_channel_test.exs
@@ -22,4 +22,21 @@ defmodule BlockScoutWeb.TransactionChannelTest do
         assert false, "Expected message received nothing."
     end
   end
+
+  test "subscribed user is notified of new_pending_transaction event" do
+    topic = "transactions:new_pending_transaction"
+    @endpoint.subscribe(topic)
+
+    pending = insert(:transaction)
+
+    Notifier.handle_event({:chain_event, :transactions, [pending.hash]})
+
+    receive do
+      %Phoenix.Socket.Broadcast{topic: ^topic, event: "new_pending_transaction", payload: payload} ->
+        assert payload.transaction.hash == pending.hash
+    after
+      5_000 ->
+        assert false, "Expected message received nothing."
+    end
+  end
 end
diff --git a/apps/block_scout_web/test/block_scout_web/controllers/address_contract_controller_test.exs b/apps/block_scout_web/test/block_scout_web/controllers/address_contract_controller_test.exs
index 0cdb3ae8ad..2bd2171b02 100644
--- a/apps/block_scout_web/test/block_scout_web/controllers/address_contract_controller_test.exs
+++ b/apps/block_scout_web/test/block_scout_web/controllers/address_contract_controller_test.exs
@@ -3,15 +3,15 @@ defmodule BlockScoutWeb.AddressContractControllerTest do
 
   import BlockScoutWeb.Router.Helpers, only: [address_contract_path: 3]
 
-  alias Explorer.Factory
   alias Explorer.Chain.Hash
   alias Explorer.ExchangeRates.Token
+  alias Explorer.Factory
 
   describe "GET index/3" do
-    test "returns not found for unexistent address", %{conn: conn} do
-      unexistent_address_hash = Hash.to_string(Factory.address_hash())
+    test "returns not found for nonexistent address", %{conn: conn} do
+      nonexistent_address_hash = Hash.to_string(Factory.address_hash())
 
-      conn = get(conn, address_contract_path(BlockScoutWeb.Endpoint, :index, unexistent_address_hash))
+      conn = get(conn, address_contract_path(BlockScoutWeb.Endpoint, :index, nonexistent_address_hash))
 
       assert html_response(conn, 404)
     end
diff --git a/apps/block_scout_web/test/block_scout_web/controllers/block_transaction_controller_test.exs b/apps/block_scout_web/test/block_scout_web/controllers/block_transaction_controller_test.exs
index 10e3cbfb20..0c1c41c70c 100644
--- a/apps/block_scout_web/test/block_scout_web/controllers/block_transaction_controller_test.exs
+++ b/apps/block_scout_web/test/block_scout_web/controllers/block_transaction_controller_test.exs
@@ -35,6 +35,50 @@ defmodule BlockScoutWeb.BlockTransactionControllerTest do
       assert 2 == Enum.count(conn.assigns.transactions)
     end
 
+    test "does not return transactions for non-consensus block number", %{conn: conn} do
+      block = insert(:block, consensus: false)
+
+      :transaction
+      |> insert()
+      |> with_block(block)
+
+      conn = get(conn, block_transaction_path(conn, :index, block.number))
+
+      assert html_response(conn, 404)
+    end
+
+    test "returns transactions for consensus block hash", %{conn: conn} do
+      block = insert(:block, consensus: true)
+
+      :transaction
+      |> insert()
+      |> with_block(block)
+
+      conn = get(conn, block_transaction_path(conn, :index, block.hash))
+
+      assert html_response(conn, 200)
+      assert Enum.count(conn.assigns.transactions) == 1
+    end
+
+    test "returns transactions for non-consensus block hash", %{conn: conn} do
+      block = insert(:block, consensus: false)
+
+      :transaction
+      |> insert()
+      |> with_block(block)
+
+      conn = get(conn, block_transaction_path(conn, :index, block.hash))
+
+      assert html_response(conn, 200)
+      assert Enum.count(conn.assigns.transactions) == 1
+    end
+
+    test "does not return transactions for invalid block hash", %{conn: conn} do
+      conn = get(conn, block_transaction_path(conn, :index, "0x0"))
+
+      assert html_response(conn, 404)
+    end
+
     test "does not return unrelated transactions", %{conn: conn} do
       insert(:transaction)
       block = insert(:block)
diff --git a/apps/block_scout_web/test/block_scout_web/controllers/chain_controller_test.exs b/apps/block_scout_web/test/block_scout_web/controllers/chain_controller_test.exs
index a8011dce5e..678edbb0af 100644
--- a/apps/block_scout_web/test/block_scout_web/controllers/chain_controller_test.exs
+++ b/apps/block_scout_web/test/block_scout_web/controllers/chain_controller_test.exs
@@ -3,6 +3,8 @@ defmodule BlockScoutWeb.ChainControllerTest do
 
   import BlockScoutWeb.Router.Helpers, only: [chain_path: 2, block_path: 3, transaction_path: 3, address_path: 3]
 
+  alias Explorer.Chain.Block
+
   describe "GET index/2" do
     test "returns a welcome message", %{conn: conn} do
       conn = get(conn, chain_path(BlockScoutWeb.Endpoint, :show))
@@ -64,13 +66,29 @@ defmodule BlockScoutWeb.ChainControllerTest do
   end
 
   describe "GET q/2" do
-    test "finds a block by block number", %{conn: conn} do
+    test "finds a consensus block by block number", %{conn: conn} do
       insert(:block, number: 37)
       conn = get(conn, "/search?q=37")
 
       assert redirected_to(conn) == block_path(conn, :show, "37")
     end
 
+    test "does not find non-consensus block by number", %{conn: conn} do
+      %Block{number: number} = insert(:block, consensus: false)
+
+      conn = get(conn, "/search?q=#{number}")
+
+      assert conn.status == 404
+    end
+
+    test "finds non-consensus block by hash", %{conn: conn} do
+      %Block{hash: hash} = insert(:block, consensus: false)
+
+      conn = get(conn, "/search?q=#{hash}")
+
+      assert redirected_to(conn) == block_path(conn, :show, hash)
+    end
+
     test "finds a transaction by hash", %{conn: conn} do
       transaction =
         :transaction
diff --git a/apps/block_scout_web/test/block_scout_web/controllers/smart_contract_controller_test.exs b/apps/block_scout_web/test/block_scout_web/controllers/smart_contract_controller_test.exs
index e69e5e7316..892b05692e 100644
--- a/apps/block_scout_web/test/block_scout_web/controllers/smart_contract_controller_test.exs
+++ b/apps/block_scout_web/test/block_scout_web/controllers/smart_contract_controller_test.exs
@@ -3,15 +3,33 @@ defmodule BlockScoutWeb.SmartContractControllerTest do
 
   import Mox
 
+  alias Explorer.Chain.Hash
+  alias Explorer.Factory
+
   setup :verify_on_exit!
 
   describe "GET index/3" do
-    test "error for invalid address", %{conn: conn} do
+    test "returns not found for nonexistent address" do
+      nonexistent_address_hash = Hash.to_string(Factory.address_hash())
+      path = smart_contract_path(BlockScoutWeb.Endpoint, :index, hash: nonexistent_address_hash)
+
+      conn =
+        build_conn()
+        |> put_req_header("x-requested-with", "xmlhttprequest")
+        |> get(path)
+
+      assert html_response(conn, 404)
+    end
+
+    test "error for invalid address" do
       path = smart_contract_path(BlockScoutWeb.Endpoint, :index, hash: "0x00")
 
-      conn = get(conn, path)
+      conn =
+        build_conn()
+        |> put_req_header("x-requested-with", "xmlhttprequest")
+        |> get(path)
 
-      assert conn.status == 404
+      assert conn.status == 422
     end
 
     test "only responds to ajax requests", %{conn: conn} do
@@ -44,7 +62,27 @@ defmodule BlockScoutWeb.SmartContractControllerTest do
   end
 
   describe "GET show/3" do
-    test "error for invalid address", %{conn: conn} do
+    test "returns not found for nonexistent address" do
+      nonexistent_address_hash = Hash.to_string(Factory.address_hash())
+
+      path =
+        smart_contract_path(
+          BlockScoutWeb.Endpoint,
+          :show,
+          nonexistent_address_hash,
+          function_name: "get",
+          args: []
+        )
+
+      conn =
+        build_conn()
+        |> put_req_header("x-requested-with", "xmlhttprequest")
+        |> get(path)
+
+      assert html_response(conn, 404)
+    end
+
+    test "error for invalid address" do
       path =
         smart_contract_path(
           BlockScoutWeb.Endpoint,
@@ -54,9 +92,12 @@ defmodule BlockScoutWeb.SmartContractControllerTest do
           args: []
         )
 
-      conn = get(conn, path)
+      conn =
+        build_conn()
+        |> put_req_header("x-requested-with", "xmlhttprequest")
+        |> get(path)
 
-      assert conn.status == 404
+      assert conn.status == 422
     end
 
     test "only responds to ajax requests", %{conn: conn} do
@@ -77,7 +118,8 @@ defmodule BlockScoutWeb.SmartContractControllerTest do
     end
 
     test "fetch the function value from the blockchain" do
-      smart_contract = insert(:smart_contract)
+      address = insert(:contract_address)
+      smart_contract = insert(:smart_contract, address_hash: address.hash)
 
       blockchain_get_function_mock()
 
diff --git a/apps/block_scout_web/test/block_scout_web/controllers/transaction_log_controller_test.exs b/apps/block_scout_web/test/block_scout_web/controllers/transaction_log_controller_test.exs
index eb1550fd5a..c84525219f 100644
--- a/apps/block_scout_web/test/block_scout_web/controllers/transaction_log_controller_test.exs
+++ b/apps/block_scout_web/test/block_scout_web/controllers/transaction_log_controller_test.exs
@@ -119,4 +119,16 @@ defmodule BlockScoutWeb.TransactionLogControllerTest do
 
     assert %Token{} = conn.assigns.exchange_rate
   end
+
+  test "loads for transcations that created a contract", %{conn: conn} do
+    contract_address = insert(:contract_address)
+
+    transaction =
+      :transaction
+      |> insert(to_address: nil)
+      |> with_contract_creation(contract_address)
+
+    conn = get(conn, transaction_log_path(conn, :index, transaction))
+    assert html_response(conn, 200)
+  end
 end
diff --git a/apps/block_scout_web/test/block_scout_web/features/pages/address_page.ex b/apps/block_scout_web/test/block_scout_web/features/pages/address_page.ex
index 9c2f3ba3e5..d4ad3ae449 100644
--- a/apps/block_scout_web/test/block_scout_web/features/pages/address_page.ex
+++ b/apps/block_scout_web/test/block_scout_web/features/pages/address_page.ex
@@ -15,6 +15,22 @@ defmodule BlockScoutWeb.AddressPage do
     css("[data-test='address_balance']")
   end
 
+  def token_balance(count: count) do
+    css("[data-dropdown-token-balance-test]", count: count)
+  end
+
+  def token_balance_counter(text) do
+    css("[data-tokens-count]", text: "#{text} tokens")
+  end
+
+  def token_type(count: count) do
+    css("[data-token-type]", count: count)
+  end
+
+  def token_type_count(type: type, text: text) do
+    css("[data-number-of-tokens-by-type='#{type}']", text: text)
+  end
+
   def address(%Address{hash: hash}) do
     css("[data-address-hash='#{hash}']", text: to_string(hash))
   end
@@ -31,6 +47,18 @@ defmodule BlockScoutWeb.AddressPage do
     click(session, css("[data-test='tokens_tab_link']"))
   end
 
+  def click_balance_dropdown_toggle(session) do
+    click(session, css("[data-dropdown-toggle]"))
+  end
+
+  def fill_balance_dropdown_search(session, text) do
+    fill_in(session, css("[data-filter-dropdown-tokens]"), with: text)
+  end
+
+  def click_outside_of_the_dropdown(session) do
+    click(session, css("[data-test='outside_of_dropdown']"))
+  end
+
   def click_token_transfers(session, %Token{contract_address_hash: contract_address_hash}) do
     click(session, css("[data-test='token_transfers_#{contract_address_hash}']"))
   end
diff --git a/apps/block_scout_web/test/block_scout_web/features/viewing_addresses_test.exs b/apps/block_scout_web/test/block_scout_web/features/viewing_addresses_test.exs
index aea6abe896..c89847d0c6 100644
--- a/apps/block_scout_web/test/block_scout_web/features/viewing_addresses_test.exs
+++ b/apps/block_scout_web/test/block_scout_web/features/viewing_addresses_test.exs
@@ -460,4 +460,82 @@ defmodule BlockScoutWeb.ViewingAddressesTest do
       |> refute_has(AddressPage.token_transfers_expansion(transaction))
     end
   end
+
+  describe "viewing token balances" do
+    setup do
+      block = insert(:block)
+      lincoln = insert(:address, fetched_coin_balance: 5)
+      taft = insert(:address, fetched_coin_balance: 5)
+
+      contract_address = insert(:contract_address)
+      insert(:token, name: "atoken", symbol: "AT", contract_address: contract_address, type: "ERC-721")
+
+      transaction =
+        :transaction
+        |> insert(from_address: lincoln, to_address: contract_address)
+        |> with_block(block)
+
+      insert(
+        :token_transfer,
+        from_address: lincoln,
+        to_address: taft,
+        transaction: transaction,
+        token_contract_address: contract_address
+      )
+
+      insert(:token_balance, address: lincoln, token_contract_address_hash: contract_address.hash)
+
+      contract_address_2 = insert(:contract_address)
+      insert(:token, name: "token2", symbol: "T2", contract_address: contract_address_2, type: "ERC-20")
+
+      transaction_2 =
+        :transaction
+        |> insert(from_address: lincoln, to_address: contract_address_2)
+        |> with_block(block)
+
+      insert(
+        :token_transfer,
+        from_address: lincoln,
+        to_address: taft,
+        transaction: transaction_2,
+        token_contract_address: contract_address_2
+      )
+
+      insert(:token_balance, address: lincoln, token_contract_address_hash: contract_address_2.hash)
+
+      {:ok, lincoln: lincoln}
+    end
+
+    test "filter tokens balances by token name", %{session: session, lincoln: lincoln} do
+      session
+      |> AddressPage.visit_page(lincoln)
+      |> AddressPage.click_balance_dropdown_toggle()
+      |> AddressPage.fill_balance_dropdown_search("ato")
+      |> assert_has(AddressPage.token_balance(count: 1))
+      |> assert_has(AddressPage.token_type(count: 1))
+      |> assert_has(AddressPage.token_type_count(type: "ERC-721", text: "1"))
+      |> assert_has(AddressPage.token_balance_counter("1"))
+    end
+
+    test "filter token balances by token symbol", %{session: session, lincoln: lincoln} do
+      session
+      |> AddressPage.visit_page(lincoln)
+      |> AddressPage.click_balance_dropdown_toggle()
+      |> AddressPage.fill_balance_dropdown_search("T2")
+      |> assert_has(AddressPage.token_balance(count: 1))
+      |> assert_has(AddressPage.token_type(count: 1))
+      |> assert_has(AddressPage.token_type_count(type: "ERC-20", text: "1"))
+      |> assert_has(AddressPage.token_balance_counter("1"))
+    end
+
+    test "reset token balances filter when dropdown closes", %{session: session, lincoln: lincoln} do
+      session
+      |> AddressPage.visit_page(lincoln)
+      |> AddressPage.click_balance_dropdown_toggle()
+      |> AddressPage.fill_balance_dropdown_search("ato")
+      |> assert_has(AddressPage.token_balance_counter("1"))
+      |> AddressPage.click_outside_of_the_dropdown()
+      |> assert_has(AddressPage.token_balance_counter("2"))
+    end
+  end
 end
diff --git a/apps/block_scout_web/test/block_scout_web/features/viewing_transactions_test.exs b/apps/block_scout_web/test/block_scout_web/features/viewing_transactions_test.exs
index f2b522808c..fc0fe78dee 100644
--- a/apps/block_scout_web/test/block_scout_web/features/viewing_transactions_test.exs
+++ b/apps/block_scout_web/test/block_scout_web/features/viewing_transactions_test.exs
@@ -4,7 +4,7 @@ defmodule BlockScoutWeb.ViewingTransactionsTest do
   use BlockScoutWeb.FeatureCase, async: true
 
   alias Explorer.Chain.Wei
-  alias BlockScoutWeb.{AddressPage, Notifier, TransactionListPage, TransactionLogsPage, TransactionPage}
+  alias BlockScoutWeb.{AddressPage, TransactionListPage, TransactionLogsPage, TransactionPage}
 
   setup do
     block =
@@ -109,18 +109,6 @@ defmodule BlockScoutWeb.ViewingTransactionsTest do
       |> assert_has(TransactionPage.detail_hash(pending))
       |> assert_has(TransactionPage.is_pending())
     end
-
-    test "pending transactions live update once collated", %{session: session, pending: pending} do
-      session
-      |> TransactionPage.visit_page(pending)
-
-      transaction = with_block(pending)
-
-      Notifier.handle_event({:chain_event, :transactions, [transaction.hash]})
-
-      session
-      |> refute_has(TransactionPage.is_pending())
-    end
   end
 
   describe "viewing a transaction page" do
diff --git a/apps/block_scout_web/test/block_scout_web/views/error_helpers_test.exs b/apps/block_scout_web/test/block_scout_web/views/error_helpers_test.exs
index f61256f383..ffa3899fba 100644
--- a/apps/block_scout_web/test/block_scout_web/views/error_helpers_test.exs
+++ b/apps/block_scout_web/test/block_scout_web/views/error_helpers_test.exs
@@ -10,21 +10,33 @@ defmodule BlockScoutWeb.ErrorHelpersTest do
     ]
   }
 
-  test "error_tag/2 renders spans with default options" do
-    assert ErrorHelpers.error_tag(@changeset, :contract_code) == [
-             content_tag(:span, "has already been taken", class: "has-error")
-           ]
-  end
+  describe "error_tag tests" do
+    test "error_tag/2 renders spans with default options" do
+      assert ErrorHelpers.error_tag(@changeset, :contract_code) == [
+               content_tag(:span, "has already been taken", class: "has-error")
+             ]
+    end
+
+    test "error_tag/3 overrides default options" do
+      assert ErrorHelpers.error_tag(@changeset, :contract_code, class: "something-else") == [
+               content_tag(:span, "has already been taken", class: "something-else")
+             ]
+    end
 
-  test "error_tag/3 overrides default options" do
-    assert ErrorHelpers.error_tag(@changeset, :contract_code, class: "something-else") == [
-             content_tag(:span, "has already been taken", class: "something-else")
-           ]
+    test "error_tag/3 merges given options with default ones" do
+      assert ErrorHelpers.error_tag(@changeset, :contract_code, data_hidden: true) == [
+               content_tag(:span, "has already been taken", class: "has-error", data_hidden: true)
+             ]
+    end
   end
 
-  test "error_tag/3 merges given options with default ones" do
-    assert ErrorHelpers.error_tag(@changeset, :contract_code, data_hidden: true) == [
-             content_tag(:span, "has already been taken", class: "has-error", data_hidden: true)
-           ]
+  describe "translate_error/1 tests" do
+    test "returns errors" do
+      assert ErrorHelpers.translate_error({"test", []}) == "test"
+    end
+
+    test "returns errors with count" do
+      assert ErrorHelpers.translate_error({"%{count} test", [count: 1]}) == "1 test"
+    end
   end
 end
diff --git a/apps/block_scout_web/test/block_scout_web/views/layout_view_test.exs b/apps/block_scout_web/test/block_scout_web/views/layout_view_test.exs
index 932d60ef1b..33d41d9570 100644
--- a/apps/block_scout_web/test/block_scout_web/views/layout_view_test.exs
+++ b/apps/block_scout_web/test/block_scout_web/views/layout_view_test.exs
@@ -1,3 +1,9 @@
 defmodule BlockScoutWeb.LayoutViewTest do
   use BlockScoutWeb.ConnCase, async: true
+
+  alias BlockScoutWeb.LayoutView
+
+  test "configured_social_media_services/0" do
+    assert length(LayoutView.configured_social_media_services()) > 0
+  end
 end
diff --git a/apps/block_scout_web/test/block_scout_web/views/transaction_view_test.exs b/apps/block_scout_web/test/block_scout_web/views/transaction_view_test.exs
index 60ce701647..82df6450a6 100644
--- a/apps/block_scout_web/test/block_scout_web/views/transaction_view_test.exs
+++ b/apps/block_scout_web/test/block_scout_web/views/transaction_view_test.exs
@@ -143,7 +143,7 @@ defmodule BlockScoutWeb.TransactionViewTest do
         |> insert(to_address: build(:address), created_contract_address: nil)
         |> Repo.preload([:created_contract_address, :to_address])
 
-      assert TransactionView.to_address(transaction) == transaction.to_address
+      assert TransactionView.to_address_hash(transaction) == transaction.to_address_hash
     end
   end
 
diff --git a/apps/block_scout_web/test/phoenix/param/explorer/chain/block_test.exs b/apps/block_scout_web/test/phoenix/param/explorer/chain/block_test.exs
new file mode 100644
index 0000000000..38ff7d5e54
--- /dev/null
+++ b/apps/block_scout_web/test/phoenix/param/explorer/chain/block_test.exs
@@ -0,0 +1,17 @@
+defmodule Phoenix.Param.Explorer.Chain.BlockTest do
+  use ExUnit.Case
+
+  import Explorer.Factory
+
+  test "without consensus" do
+    block = build(:block, consensus: false)
+
+    assert Phoenix.Param.to_param(block) == to_string(block.hash)
+  end
+
+  test "with consensus" do
+    block = build(:block, consensus: true)
+
+    assert Phoenix.Param.to_param(block) == to_string(block.number)
+  end
+end
diff --git a/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc.ex b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc.ex
index 35d72e8aef..354088f078 100644
--- a/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc.ex
+++ b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc.ex
@@ -17,7 +17,7 @@ defmodule EthereumJSONRPC do
   """
 
   alias Explorer.Chain.Block
-  alias EthereumJSONRPC.{Blocks, Receipts, Subscription, Transactions, Transport, Variant}
+  alias EthereumJSONRPC.{Blocks, Receipts, Subscription, Transactions, Transport, Uncles, Variant}
 
   @typedoc """
   Truncated 20-byte [KECCAK-256](https://en.wikipedia.org/wiki/SHA-3) hash encoded as a hexadecimal number in a
@@ -63,6 +63,11 @@ defmodule EthereumJSONRPC do
           {:transport, Transport.t()} | {:transport_options, Transport.options()} | {:variant, Variant.t()}
         ]
 
+  @typedoc """
+  If there are more blocks.
+  """
+  @type next :: :end_of_chain | :more
+
   @typedoc """
   8 byte [KECCAK-256](https://en.wikipedia.org/wiki/SHA-3) hash of the proof-of-work.
   """
@@ -206,6 +211,14 @@ defmodule EthereumJSONRPC do
   @doc """
   Fetches blocks by block number range.
   """
+  @spec fetch_blocks_by_range(Range.t(), json_rpc_named_arguments) ::
+          {:ok, next,
+           %{
+             blocks: Blocks.params(),
+             block_second_degree_relations: Uncles.params(),
+             transactions: Transactions.params()
+           }}
+          | {:error, [reason :: term, ...]}
   def fetch_blocks_by_range(_first.._last = range, json_rpc_named_arguments) do
     id_to_params =
       range
@@ -482,13 +495,18 @@ defmodule EthereumJSONRPC do
   defp handle_get_blocks({:ok, results}, id_to_params) when is_list(results) do
     with {:ok, next, blocks} <- reduce_results(results, id_to_params) do
       elixir_blocks = Blocks.to_elixir(blocks)
+
+      elixir_uncles = Blocks.elixir_to_uncles(elixir_blocks)
       elixir_transactions = Blocks.elixir_to_transactions(elixir_blocks)
-      blocks_params = Blocks.elixir_to_params(elixir_blocks)
+
+      block_second_degree_relations_params = Uncles.elixir_to_params(elixir_uncles)
       transactions_params = Transactions.elixir_to_params(elixir_transactions)
+      blocks_params = Blocks.elixir_to_params(elixir_blocks)
 
       {:ok, next,
        %{
          blocks: blocks_params,
+         block_second_degree_relations: block_second_degree_relations_params,
          transactions: transactions_params
        }}
     end
diff --git a/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/block.ex b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/block.ex
index 9f90c66c66..ebade1d4da 100644
--- a/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/block.ex
+++ b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/block.ex
@@ -6,10 +6,23 @@ defmodule EthereumJSONRPC.Block do
 
   import EthereumJSONRPC, only: [quantity_to_integer: 1, timestamp_to_datetime: 1]
 
-  alias EthereumJSONRPC
-  alias EthereumJSONRPC.Transactions
+  alias EthereumJSONRPC.{Transactions, Uncles}
 
   @type elixir :: %{String.t() => non_neg_integer | DateTime.t() | String.t() | nil}
+  @type params :: %{
+          difficulty: pos_integer(),
+          gas_limit: non_neg_integer(),
+          gas_used: non_neg_integer(),
+          hash: EthereumJSONRPC.hash(),
+          miner_hash: EthereumJSONRPC.hash(),
+          nonce: EthereumJSONRPC.hash(),
+          number: non_neg_integer(),
+          parent_hash: EthereumJSONRPC.hash(),
+          size: non_neg_integer(),
+          timestamp: DateTime.t(),
+          total_difficulty: non_neg_integer(),
+          uncles: [EthereumJSONRPC.hash()]
+        }
 
   @typedoc """
    * `"author"` - `t:EthereumJSONRPC.address/0` that created the block.  Aliased by `"miner"`.
@@ -91,7 +104,8 @@ defmodule EthereumJSONRPC.Block do
         parent_hash: "0x5b28c1bfd3a15230c9a46b399cd0f9a6920d432e85381cc6a140b06e8410112f",
         size: 576,
         timestamp: Timex.parse!("2017-12-15T21:03:30Z", "{ISO:Extended:Z}"),
-        total_difficulty: 340282366920938463463374607431465668165
+        total_difficulty: 340282366920938463463374607431465668165,
+        uncles: []
       }
 
   [Geth] `elixir` can be converted to params
@@ -131,11 +145,12 @@ defmodule EthereumJSONRPC.Block do
         parent_hash: "0xcd5b5c4cecd7f18a13fe974255badffd58e737dc67596d56bc01f063dd282e9e",
         size: 542,
         timestamp: Timex.parse!("2015-07-30T15:32:07Z", "{ISO:Extended:Z}"),
-        total_difficulty: 1039309006117
+        total_difficulty: 1039309006117,
+        uncles: []
       }
 
   """
-  @spec elixir_to_params(elixir) :: map
+  @spec elixir_to_params(elixir) :: params
   def elixir_to_params(
         %{
           "difficulty" => difficulty,
@@ -147,7 +162,8 @@ defmodule EthereumJSONRPC.Block do
           "parentHash" => parent_hash,
           "size" => size,
           "timestamp" => timestamp,
-          "totalDifficulty" => total_difficulty
+          "totalDifficulty" => total_difficulty,
+          "uncles" => uncles
         } = elixir
       ) do
     %{
@@ -156,13 +172,14 @@ defmodule EthereumJSONRPC.Block do
       gas_used: gas_used,
       hash: hash,
       miner_hash: miner_hash,
+      nonce: Map.get(elixir, "nonce", 0),
       number: number,
       parent_hash: parent_hash,
       size: size,
       timestamp: timestamp,
-      total_difficulty: total_difficulty
+      total_difficulty: total_difficulty,
+      uncles: uncles
     }
-    |> Map.put(:nonce, Map.get(elixir, "nonce", 0))
   end
 
   @doc """
@@ -249,6 +266,53 @@ defmodule EthereumJSONRPC.Block do
   @spec elixir_to_transactions(elixir) :: Transactions.elixir()
   def elixir_to_transactions(%{"transactions" => transactions}), do: transactions
 
+  @doc """
+  Get `t:EthereumJSONRPC.Uncles.elixir/0` from `t:elixir/0`.
+
+  Because an uncle can have multiple nephews, the `t:elixir/0` `"hash"` value is included as the `"nephewHash"` value.
+
+      iex> EthereumJSONRPC.Block.elixir_to_uncles(
+      ...>   %{
+      ...>     "author" => "0xe8ddc5c7a2d2f0d7a9798459c0104fdf5e987aca",
+      ...>     "difficulty" => 340282366920938463463374607431768211454,
+      ...>     "extraData" => "0xd5830108048650617269747986312e32322e31826c69",
+      ...>     "gasLimit" => 6926030,
+      ...>     "gasUsed" => 269607,
+      ...>     "hash" => "0xe52d77084cab13a4e724162bcd8c6028e5ecfaa04d091ee476e96b9958ed6b47",
+      ...>     "logsBloom" => "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+      ...>     "miner" => "0xe8ddc5c7a2d2f0d7a9798459c0104fdf5e987aca",
+      ...>     "number" => 34,
+      ...>     "parentHash" => "0x106d528393159b93218dd410e2a778f083538098e46f1a44902aa67a164aed0b",
+      ...>     "receiptsRoot" => "0xf45ed4ab910504ffe231230879c86e32b531bb38a398a7c9e266b4a992e12dfb",
+      ...>     "sealFields" => [
+      ...>       "0x84120a71db",
+      ...>       "0xb8417ad0ecca535f81e1807dac338a57c7ccffd05d3e7f0687944650cd005360a192205df306a68eddfe216e0674c6b113050d90eff9b627c1762d43657308f986f501"
+      ...>     ],
+      ...>     "sha3Uncles" => "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
+      ...>     "signature" => "7ad0ecca535f81e1807dac338a57c7ccffd05d3e7f0687944650cd005360a192205df306a68eddfe216e0674c6b113050d90eff9b627c1762d43657308f986f501",
+      ...>     "size" => 1493,
+      ...>     "stateRoot" => "0x6eaa6281df37b9b010f4779affc25ee059088240547ce86cf7ca7b7acd952d4f",
+      ...>     "step" => "302674395",
+      ...>     "timestamp" => Timex.parse!("2017-12-15T21:06:15Z", "{ISO:Extended:Z}"),
+      ...>     "totalDifficulty" => 11569600475311907757754736652679816646147,
+      ...>     "transactions" => [],
+      ...>     "transactionsRoot" => "0x2c2e243e9735f6d0081ffe60356c0e4ec4c6a9064c68d10bf8091ff896f33087",
+      ...>     "uncles" => ["0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d15273311"]
+      ...>   }
+      ...> )
+      [
+        %{
+          "hash" => "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d15273311",
+          "nephewHash" => "0xe52d77084cab13a4e724162bcd8c6028e5ecfaa04d091ee476e96b9958ed6b47"
+        }
+      ]
+
+  """
+  @spec elixir_to_uncles(elixir) :: Uncles.elixir()
+  def elixir_to_uncles(%{"hash" => nephew_hash, "uncles" => uncles}) do
+    Enum.map(uncles, &%{"hash" => &1, "nephewHash" => nephew_hash})
+  end
+
   @doc """
   Decodes the stringly typed numerical fields to `t:non_neg_integer/0` and the timestamps to `t:DateTime.t/0`
 
diff --git a/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/blocks.ex b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/blocks.ex
index 74f9bc5bd0..a6964e17db 100644
--- a/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/blocks.ex
+++ b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/blocks.ex
@@ -4,9 +4,10 @@ defmodule EthereumJSONRPC.Blocks do
   and [`eth_getBlockByNumber`](https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_getblockbynumber) from batch requests.
   """
 
-  alias EthereumJSONRPC.{Block, Transactions}
+  alias EthereumJSONRPC.{Block, Transactions, Uncles}
 
   @type elixir :: [Block.elixir()]
+  @type params :: [Block.params()]
   @type t :: [Block.t()]
 
   @doc """
@@ -37,7 +38,7 @@ defmodule EthereumJSONRPC.Blocks do
       ...>       "totalDifficulty" => 131072,
       ...>       "transactions" => [],
       ...>       "transactionsRoot" => "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
-      ...>       "uncles" => []
+      ...>       "uncles" => ["0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d15273311"]
       ...>     }
       ...>   ]
       ...> )
@@ -53,12 +54,13 @@ defmodule EthereumJSONRPC.Blocks do
           parent_hash: "0x0000000000000000000000000000000000000000000000000000000000000000",
           size: 533,
           timestamp: Timex.parse!("1970-01-01T00:00:00Z", "{ISO:Extended:Z}"),
-          total_difficulty: 131072
+          total_difficulty: 131072,
+          uncles: ["0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d15273311"]
         }
       ]
 
   """
-  @spec elixir_to_params(elixir) :: [map]
+  @spec elixir_to_params(elixir) :: params()
   def elixir_to_params(elixir) when is_list(elixir) do
     Enum.map(elixir, &Block.elixir_to_params/1)
   end
@@ -142,11 +144,77 @@ defmodule EthereumJSONRPC.Blocks do
       ]
 
   """
-  @spec elixir_to_transactions(t) :: Transactions.elixir()
+  @spec elixir_to_transactions(elixir) :: Transactions.elixir()
   def elixir_to_transactions(elixir) when is_list(elixir) do
     Enum.flat_map(elixir, &Block.elixir_to_transactions/1)
   end
 
+  @doc """
+  Extracts the `t:EthereumJSONRPC.Uncles.elixir/0` from the `t:elixir/0`.
+
+      iex> EthereumJSONRPC.Blocks.elixir_to_uncles([
+      ...>   %{
+      ...>     "author" => "0xe8ddc5c7a2d2f0d7a9798459c0104fdf5e987aca",
+      ...>     "difficulty" => 340282366920938463463374607431768211454,
+      ...>     "extraData" => "0xd5830108048650617269747986312e32322e31826c69",
+      ...>     "gasLimit" => 6926030,
+      ...>     "gasUsed" => 269607,
+      ...>     "hash" => "0xe52d77084cab13a4e724162bcd8c6028e5ecfaa04d091ee476e96b9958ed6b47",
+      ...>     "logsBloom" => "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
+      ...>     "miner" => "0xe8ddc5c7a2d2f0d7a9798459c0104fdf5e987aca",
+      ...>     "number" => 34,
+      ...>     "parentHash" => "0x106d528393159b93218dd410e2a778f083538098e46f1a44902aa67a164aed0b",
+      ...>     "receiptsRoot" => "0xf45ed4ab910504ffe231230879c86e32b531bb38a398a7c9e266b4a992e12dfb",
+      ...>     "sealFields" => ["0x84120a71db",
+      ...>      "0xb8417ad0ecca535f81e1807dac338a57c7ccffd05d3e7f0687944650cd005360a192205df306a68eddfe216e0674c6b113050d90eff9b627c1762d43657308f986f501"],
+      ...>     "sha3Uncles" => "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
+      ...>     "signature" => "7ad0ecca535f81e1807dac338a57c7ccffd05d3e7f0687944650cd005360a192205df306a68eddfe216e0674c6b113050d90eff9b627c1762d43657308f986f501",
+      ...>     "size" => 1493,
+      ...>     "stateRoot" => "0x6eaa6281df37b9b010f4779affc25ee059088240547ce86cf7ca7b7acd952d4f",
+      ...>     "step" => "302674395",
+      ...>     "timestamp" => Timex.parse!("2017-12-15T21:06:15Z", "{ISO:Extended:Z}"),
+      ...>     "totalDifficulty" => 11569600475311907757754736652679816646147,
+      ...>     "transactions" => [
+      ...>       %{
+      ...>         "blockHash" => "0xe52d77084cab13a4e724162bcd8c6028e5ecfaa04d091ee476e96b9958ed6b47",
+      ...>         "blockNumber" => 34,
+      ...>         "chainId" => 77,
+      ...>         "condition" => nil,
+      ...>         "creates" => "0xffc87239eb0267bc3ca2cd51d12fbf278e02ccb4",
+      ...>         "from" => "0xe8ddc5c7a2d2f0d7a9798459c0104fdf5e987aca",
+      ...>         "gas" => 4700000,
+      ...>         "gasPrice" => 100000000000,
+      ...>         "hash" => "0x3a3eb134e6792ce9403ea4188e5e79693de9e4c94e499db132be086400da79e6",
+      ...>         "input" => "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",
+      ...>         "nonce" => 0,
+      ...>         "publicKey" => "0xe5d196ad4ceada719d9e592f7166d0c75700f6eab2e3c3de34ba751ea786527cb3f6eb96ad9fdfdb9989ff572df50f1c42ef800af9c5207a38b929aff969b5c9",
+      ...>         "r" => "0xad3733df250c87556335ffe46c23e34dbaffde93097ef92f52c88632a40f0c75",
+      ...>         "raw" => "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",
+      ...>         "s" => "0x72caddc0371451a58de2ca6ab64e0f586ccdb9465ff54e1c82564940e89291e3",
+      ...>         "standardV" => "0x0",
+      ...>         "to" => nil,
+      ...>         "transactionIndex" => 0,
+      ...>         "v" => "0xbd",
+      ...>         "value" => 0
+      ...>       }
+      ...>     ],
+      ...>     "transactionsRoot" => "0x2c2e243e9735f6d0081ffe60356c0e4ec4c6a9064c68d10bf8091ff896f33087",
+      ...>     "uncles" => ["0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d15273311"]
+      ...>   }
+      ...> ])
+      [
+        %{
+          "hash" => "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d15273311",
+          "nephewHash" => "0xe52d77084cab13a4e724162bcd8c6028e5ecfaa04d091ee476e96b9958ed6b47"
+        }
+      ]
+
+  """
+  @spec elixir_to_uncles(elixir) :: Uncles.elixir()
+  def elixir_to_uncles(elixir) do
+    Enum.flat_map(elixir, &Block.elixir_to_uncles/1)
+  end
+
   @doc """
   Decodes the stringly typed numerical fields to `t:non_neg_integer/0` and the timestamps to `t:DateTime.t/0`
 
diff --git a/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/transactions.ex b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/transactions.ex
index d3cae4a83b..c0642d1f61 100644
--- a/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/transactions.ex
+++ b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/transactions.ex
@@ -8,6 +8,7 @@ defmodule EthereumJSONRPC.Transactions do
   alias EthereumJSONRPC.Transaction
 
   @type elixir :: [Transaction.elixir()]
+  @type params :: [Transaction.params()]
   @type t :: [Transaction.t()]
 
   @doc """
diff --git a/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/uncle.ex b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/uncle.ex
new file mode 100644
index 0000000000..871f0daa7d
--- /dev/null
+++ b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/uncle.ex
@@ -0,0 +1,39 @@
+defmodule EthereumJSONRPC.Uncle do
+  @moduledoc """
+  [Uncle](https://github.com/ethereum/wiki/wiki/Glossary#ethereum-blockchain).
+
+  An uncle is a block that didn't make the main chain due to them being validated slightly behind what became the main
+  chain.
+  """
+
+  @type elixir :: %{String.t() => EthereumJSONRPC.hash()}
+
+  @typedoc """
+  * `"hash"` - the hash of the uncle block.
+  * `"nephewHash"` - the hash of the nephew block that included `"hash` as an uncle.
+  """
+  @type t :: %{String.t() => EthereumJSONRPC.hash()}
+
+  @type params :: %{nephew_hash: EthereumJSONRPC.hash(), uncle_hash: EthereumJSONRPC.hash()}
+
+  @doc """
+  Converts each entry in `t:elixir/0` to `t:params/0` used in `Explorer.Chain.Uncle.changeset/2`.
+
+      iex> EthereumJSONRPC.Uncle.elixir_to_params(
+      ...>   %{
+      ...>     "hash" => "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d15273311",
+      ...>     "nephewHash" => "0xe52d77084cab13a4e724162bcd8c6028e5ecfaa04d091ee476e96b9958ed6b47"
+      ...>   }
+      ...> )
+      %{
+        nephew_hash: "0xe52d77084cab13a4e724162bcd8c6028e5ecfaa04d091ee476e96b9958ed6b47",
+        uncle_hash: "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d15273311"
+      }
+
+  """
+  @spec elixir_to_params(elixir) :: params
+  def elixir_to_params(%{"hash" => uncle_hash, "nephewHash" => nephew_hash})
+      when is_binary(uncle_hash) and is_binary(nephew_hash) do
+    %{nephew_hash: nephew_hash, uncle_hash: uncle_hash}
+  end
+end
diff --git a/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/uncles.ex b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/uncles.ex
new file mode 100644
index 0000000000..6755a439be
--- /dev/null
+++ b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/uncles.ex
@@ -0,0 +1,35 @@
+defmodule EthereumJSONRPC.Uncles do
+  @moduledoc """
+  List of [uncles](https://github.com/ethereum/wiki/wiki/Glossary#ethereum-blockchain).  Uncles are blocks that didn't
+  make the main chain due to them being validated slightly behind what became the main chain.
+  """
+
+  alias EthereumJSONRPC.Uncle
+
+  @type elixir :: [Uncle.elixir()]
+  @type params :: [Uncle.params()]
+
+  @doc """
+  Converts each entry in `elixir` to params used in `Explorer.Chain.Uncle.changeset/2`.
+
+      iex> EthereumJSONRPC.Uncles.elixir_to_params(
+      ...>   [
+      ...>     %{
+      ...>       "hash" => "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d15273311",
+      ...>       "nephewHash" => "0xe52d77084cab13a4e724162bcd8c6028e5ecfaa04d091ee476e96b9958ed6b47"
+      ...>     }
+      ...>    ]
+      ...> )
+      [
+        %{
+          uncle_hash: "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d15273311",
+          nephew_hash: "0xe52d77084cab13a4e724162bcd8c6028e5ecfaa04d091ee476e96b9958ed6b47"
+        }
+      ]
+
+  """
+  @spec elixir_to_params(elixir) :: params
+  def elixir_to_params(elixir) when is_list(elixir) do
+    Enum.map(elixir, &Uncle.elixir_to_params/1)
+  end
+end
diff --git a/apps/ethereum_jsonrpc/test/ethereum_jsonrpc/uncle_test.exs b/apps/ethereum_jsonrpc/test/ethereum_jsonrpc/uncle_test.exs
new file mode 100644
index 0000000000..7cc8f18acb
--- /dev/null
+++ b/apps/ethereum_jsonrpc/test/ethereum_jsonrpc/uncle_test.exs
@@ -0,0 +1,5 @@
+defmodule EthereumJSONRPC.UncleTest do
+  use ExUnit.Case, async: true
+
+  doctest EthereumJSONRPC.Uncle
+end
diff --git a/apps/ethereum_jsonrpc/test/ethereum_jsonrpc/uncles_test.exs b/apps/ethereum_jsonrpc/test/ethereum_jsonrpc/uncles_test.exs
new file mode 100644
index 0000000000..b38e3ad1cd
--- /dev/null
+++ b/apps/ethereum_jsonrpc/test/ethereum_jsonrpc/uncles_test.exs
@@ -0,0 +1,5 @@
+defmodule EthereumJSONRPC.UnclesTest do
+  use ExUnit.Case, async: true
+
+  doctest EthereumJSONRPC.Uncles
+end
diff --git a/apps/ethereum_jsonrpc/test/ethereum_jsonrpc_test.exs b/apps/ethereum_jsonrpc/test/ethereum_jsonrpc_test.exs
index 4bf522d178..b21a08d801 100644
--- a/apps/ethereum_jsonrpc/test/ethereum_jsonrpc_test.exs
+++ b/apps/ethereum_jsonrpc/test/ethereum_jsonrpc_test.exs
@@ -216,7 +216,8 @@ defmodule EthereumJSONRPCTest do
                      "v" => "0x0",
                      "value" => "0x0"
                    }
-                 ]
+                 ],
+                 "uncles" => []
                }
              }
            ]}
@@ -358,7 +359,8 @@ defmodule EthereumJSONRPCTest do
                "size" => "0x0",
                "timestamp" => "0x0",
                "totalDifficulty" => "0x0",
-               "transactions" => []
+               "transactions" => [],
+               "uncles" => []
              },
              jsonrpc: "2.0"
            },
diff --git a/apps/explorer/lib/explorer/chain.ex b/apps/explorer/lib/explorer/chain.ex
index c443387679..88b4db01ed 100644
--- a/apps/explorer/lib/explorer/chain.ex
+++ b/apps/explorer/lib/explorer/chain.ex
@@ -585,6 +585,50 @@ defmodule Explorer.Chain do
     end
   end
 
+  @doc """
+  Converts `t:Explorer.Chain.Block.t/0` `hash` to the `t:Explorer.Chain.Block.t/0` with that `hash`.
+
+  Unlike `number_to_block/1`, both consensus and non-consensus blocks can be returned when looked up by `hash`.
+
+  Returns `{:ok, %Explorer.Chain.Block{}}` if found
+
+      iex> %Block{hash: hash} = insert(:block, consensus: false)
+      iex> {:ok, %Explorer.Chain.Block{hash: found_hash}} = Explorer.Chain.hash_to_block(hash)
+      iex> found_hash == hash
+      true
+
+  Returns `{:error, :not_found}` if not found
+
+      iex> {:ok, hash} = Explorer.Chain.string_to_block_hash(
+      ...>   "0x9fc76417374aa880d4449a1f7f31ec597f00b1f6f3dd2d66f4c9c6c445836d8b"
+      ...> )
+      iex> Explorer.Chain.hash_to_block(hash)
+      {:error, :not_found}
+
+  ## Options
+
+    * `:necessity_by_association` - use to load `t:association/0` as `:required` or `:optional`.  If an association is
+      `:required`, and the `t:Explorer.Chain.Block.t/0` has no associated record for that association, then the
+      `t:Explorer.Chain.Block.t/0` will not be included in the page `entries`.
+
+  """
+  @spec hash_to_block(Hash.Full.t(), [necessity_by_association_option]) :: {:ok, Block.t()} | {:error, :not_found}
+  def hash_to_block(%Hash{byte_count: unquote(Hash.Full.byte_count())} = hash, options \\ []) when is_list(options) do
+    necessity_by_association = Keyword.get(options, :necessity_by_association, %{})
+
+    Block
+    |> where(hash: ^hash)
+    |> join_associations(necessity_by_association)
+    |> Repo.one()
+    |> case do
+      nil ->
+        {:error, :not_found}
+
+      block ->
+        {:ok, block}
+    end
+  end
+
   @doc """
   Converts the `Explorer.Chain.Hash.t:t/0` to `iodata` representation that can be written efficiently to users.
 
@@ -932,6 +976,37 @@ defmodule Explorer.Chain do
     )
   end
 
+  @doc """
+  Returns a stream of all `t:Explorer.Chain.Block.t/0` `hash`es that are marked as unfetched in
+  `t:Explorer.Chain.Block.SecondDegreeRelation.t/0`.
+
+  When a block is fetched, its uncles are transformed into `t:Explorer.Chain.Block.SecondDegreeRelation.t/0` and can be
+  returned.  Once the uncle is imported its corresponding `t:Explorer.Chain.Block.SecondDegreeRelation.t/0`
+  `uncle_fetched_at` will be set and it won't be returned anymore.
+  """
+  @spec stream_unfetched_uncle_hashes(
+          initial :: accumulator,
+          reducer :: (entry :: Hash.Full.t(), accumulator -> accumulator)
+        ) :: {:ok, accumulator}
+        when accumulator: term()
+  def stream_unfetched_uncle_hashes(initial, reducer) when is_function(reducer, 2) do
+    Repo.transaction(
+      fn ->
+        query =
+          from(bsdr in Block.SecondDegreeRelation,
+            where: is_nil(bsdr.uncle_fetched_at),
+            select: bsdr.uncle_hash,
+            group_by: bsdr.uncle_hash
+          )
+
+        query
+        |> Repo.stream(timeout: :infinity)
+        |> Enum.reduce(initial, reducer)
+      end,
+      timeout: :infinity
+    )
+  end
+
   @doc """
   The number of `t:Explorer.Chain.Log.t/0`.
 
@@ -1062,7 +1137,7 @@ defmodule Explorer.Chain do
   end
 
   @doc """
-  Finds `t:Explorer.Chain.Block.t/0` with `number`
+  Finds consensus `t:Explorer.Chain.Block.t/0` with `number`.
 
   ## Options
 
@@ -1077,7 +1152,7 @@ defmodule Explorer.Chain do
     necessity_by_association = Keyword.get(options, :necessity_by_association, %{})
 
     Block
-    |> where(number: ^number)
+    |> where(consensus: true, number: ^number)
     |> join_associations(necessity_by_association)
     |> Repo.one()
     |> case do
diff --git a/apps/explorer/lib/explorer/chain/block.ex b/apps/explorer/lib/explorer/chain/block.ex
index 34b6e47ac1..7194d14344 100644
--- a/apps/explorer/lib/explorer/chain/block.ex
+++ b/apps/explorer/lib/explorer/chain/block.ex
@@ -7,9 +7,9 @@ defmodule Explorer.Chain.Block do
 
   use Explorer.Schema
 
-  alias Explorer.Chain.{Address, Gas, Hash, Transaction}
+  alias Explorer.Chain.{Address, Block.SecondDegreeRelation, Gas, Hash, Transaction}
 
-  @required_attrs ~w(difficulty gas_limit gas_used hash miner_hash nonce number parent_hash size timestamp
+  @required_attrs ~w(consensus difficulty gas_limit gas_used hash miner_hash nonce number parent_hash size timestamp
                      total_difficulty)a
 
   @typedoc """
@@ -25,6 +25,9 @@ defmodule Explorer.Chain.Block do
   @type block_number :: non_neg_integer()
 
   @typedoc """
+   * `consensus`
+     * `true` - this is a block on the longest consensus agreed upon chain.
+     * `false` - this is an uncle block from a fork.
    * `difficulty` - how hard the block was to mine.
    * `gas_limit` - If the total number of gas used by the computation spawned by the transaction, including the
      original message and any sub-messages that may be triggered, is less than or equal to the gas limit, then the
@@ -43,6 +46,7 @@ defmodule Explorer.Chain.Block do
    * `transactions` - the `t:Explorer.Chain.Transaction.t/0` in this block.
   """
   @type t :: %__MODULE__{
+          consensus: boolean(),
           difficulty: difficulty(),
           gas_limit: Gas.t(),
           gas_used: Gas.t(),
@@ -60,6 +64,7 @@ defmodule Explorer.Chain.Block do
 
   @primary_key {:hash, Hash.Full, autogenerate: false}
   schema "blocks" do
+    field(:consensus, :boolean)
     field(:difficulty, :decimal)
     field(:gas_limit, :decimal)
     field(:gas_used, :decimal)
@@ -72,7 +77,15 @@ defmodule Explorer.Chain.Block do
     timestamps()
 
     belongs_to(:miner, Address, foreign_key: :miner_hash, references: :hash, type: Hash.Address)
+
+    has_many(:nephew_relations, SecondDegreeRelation, foreign_key: :uncle_hash)
+    has_many(:nephews, through: [:nephew_relations, :nephew])
+
     belongs_to(:parent, __MODULE__, foreign_key: :parent_hash, references: :hash, type: Hash.Full)
+
+    has_many(:uncle_relations, SecondDegreeRelation, foreign_key: :nephew_hash)
+    has_many(:uncles, through: [:uncle_relations, :uncle])
+
     has_many(:transactions, Transaction)
   end
 
diff --git a/apps/explorer/lib/explorer/chain/block/second_degree_relation.ex b/apps/explorer/lib/explorer/chain/block/second_degree_relation.ex
new file mode 100644
index 0000000000..986d4d5e03
--- /dev/null
+++ b/apps/explorer/lib/explorer/chain/block/second_degree_relation.ex
@@ -0,0 +1,64 @@
+defmodule Explorer.Chain.Block.SecondDegreeRelation do
+  @moduledoc """
+  A [second-degree relative](https://en.wikipedia.org/wiki/Second-degree_relative) is a relative where the share
+  point is the parent's parent block in the chain.
+
+  For Ethereum, nephews are rewarded for included their uncles.
+
+  Uncles occur when a Proof-of-Work proof is completed slightly late, but before the next block is completes, so the
+  network knows about the late proof and can credit as an uncle in the next block.
+
+  This schema is the join schema between the `nephew` and the `uncle` it is is including the `uncle`.  The actual
+  `uncle` block is still a normal `t:Explorer.Chain.Block.t/0`.
+  """
+
+  use Explorer.Schema
+
+  alias Explorer.Chain.{Block, Hash}
+
+  @optional_fields ~w(uncle_fetched_at)a
+  @required_fields ~w(nephew_hash uncle_hash)a
+  @allowed_fields @optional_fields ++ @required_fields
+
+  @typedoc """
+   * `nephew` - `t:Explorer.Chain.Block.t/0` that included `hash` as an uncle.
+   * `nephew_hash` - foreign key for `nephew_block`.
+   * `uncle` - the uncle block.  Maybe `nil` when `uncle_fetched_at` is `nil`.  It could not be `nil` if the
+     `uncle_hash` was fetched for some other reason already.
+   * `uncle_fetched_at` - when `t:Explorer.Chain.Block.t/0` for `uncle_hash` was confirmed as fetched.
+   * `uncle_hash` - foreign key for `uncle`.
+  """
+  @type t ::
+          %__MODULE__{
+            nephew: %Ecto.Association.NotLoaded{} | Block.t(),
+            nephew_hash: Hash.Full.t(),
+            uncle: %Ecto.Association.NotLoaded{} | Block.t() | nil,
+            uncle_fetched_at: nil,
+            uncle_hash: Hash.Full.t()
+          }
+          | %__MODULE__{
+              nephew: %Ecto.Association.NotLoaded{} | Block.t(),
+              nephew_hash: Hash.Full.t(),
+              uncle: %Ecto.Association.NotLoaded{} | Block.t(),
+              uncle_fetched_at: DateTime.t(),
+              uncle_hash: Hash.Full.t()
+            }
+
+  @primary_key false
+  schema "block_second_degree_relations" do
+    field(:uncle_fetched_at, :utc_datetime)
+
+    belongs_to(:nephew, Block, foreign_key: :nephew_hash, references: :hash, type: Hash.Full)
+    belongs_to(:uncle, Block, foreign_key: :uncle_hash, references: :hash, type: Hash.Full)
+  end
+
+  def changeset(%__MODULE__{} = uncle, params) do
+    uncle
+    |> cast(params, @allowed_fields)
+    |> validate_required(@required_fields)
+    |> foreign_key_constraint(:nephew_hash)
+    |> unique_constraint(:nephew_hash, name: :uncle_hash_to_nephew_hash)
+    |> unique_constraint(:nephew_hash, name: :unfetched_uncles)
+    |> unique_constraint(:uncle_hash, name: :nephew_hash_to_uncle_hash)
+  end
+end
diff --git a/apps/explorer/lib/explorer/chain/import.ex b/apps/explorer/lib/explorer/chain/import.ex
index c9cb68a0b0..2704fa4157 100644
--- a/apps/explorer/lib/explorer/chain/import.ex
+++ b/apps/explorer/lib/explorer/chain/import.ex
@@ -39,6 +39,10 @@ defmodule Explorer.Chain.Import do
           required(:params) => params,
           optional(:timeout) => timeout
         }
+  @type block_second_degree_relations_options :: %{
+          required(:params) => params,
+          optional(:timeout) => timeout
+        }
   @type internal_transactions_options :: %{
           required(:params) => params,
           optional(:timeout) => timeout
@@ -66,6 +70,10 @@ defmodule Explorer.Chain.Import do
           optional(:on_conflict) => :nothing | :replace_all,
           optional(:timeout) => timeout
         }
+  @type transaction_forks_options :: %{
+          required(:params) => params,
+          optional(:timeout) => timeout
+        }
   @type token_balances_options :: %{
           required(:params) => params,
           optional(:timeout) => timeout
@@ -74,6 +82,7 @@ defmodule Explorer.Chain.Import do
           optional(:addresses) => addresses_options,
           optional(:balances) => balances_options,
           optional(:blocks) => blocks_options,
+          optional(:block_second_degree_relations) => block_second_degree_relations_options,
           optional(:broadcast) => boolean,
           optional(:internal_transactions) => internal_transactions_options,
           optional(:logs) => logs_options,
@@ -82,7 +91,8 @@ defmodule Explorer.Chain.Import do
           optional(:token_transfers) => token_transfers_options,
           optional(:tokens) => tokens_options,
           optional(:token_balances) => token_balances_options,
-          optional(:transactions) => transactions_options
+          optional(:transactions) => transactions_options,
+          optional(:transaction_forks) => transaction_forks_options
         }
   @type all_result ::
           {:ok,
@@ -92,6 +102,9 @@ defmodule Explorer.Chain.Import do
                %{required(:address_hash) => Hash.Address.t(), required(:block_number) => Block.block_number()}
              ],
              optional(:blocks) => [Block.t()],
+             optional(:block_second_degree_relations) => [
+               %{required(:nephew_hash) => Hash.Full.t(), required(:uncle_hash) => Hash.Full.t()}
+             ],
              optional(:internal_transactions) => [
                %{required(:index) => non_neg_integer(), required(:transaction_hash) => Hash.Full.t()}
              ],
@@ -100,7 +113,10 @@ defmodule Explorer.Chain.Import do
              optional(:token_transfers) => [TokenTransfer.t()],
              optional(:tokens) => [Token.t()],
              optional(:token_balances) => [TokenBalance.t()],
-             optional(:transactions) => [Hash.Full.t()]
+             optional(:transactions) => [Hash.Full.t()],
+             optional(:transaction_forks) => [
+               %{required(:uncle_hash) => Hash.Full.t(), required(:hash) => Hash.Full.t()}
+             ]
            }}
           | {:error, [Changeset.t()]}
           | {:error, step :: Ecto.Multi.name(), failed_value :: any(),
@@ -115,28 +131,32 @@ defmodule Explorer.Chain.Import do
   @insert_addresses_timeout 60_000
   @insert_balances_timeout 60_000
   @insert_blocks_timeout 60_000
+  @insert_block_second_degree_relations_timeout 60_000
   @insert_internal_transactions_timeout 60_000
   @insert_logs_timeout 60_000
   @insert_token_transfers_timeout 60_000
   @insert_token_balances_timeout 60_000
   @insert_tokens_timeout 60_000
   @insert_transactions_timeout 60_000
+  @insert_transaction_forks_timeout 60_000
 
   @doc """
   Bulk insert all data stored in the `Explorer`.
 
   The import returns the unique key(s) for each type of record inserted.
 
-  | Key                      | Value Type                                                                                      | Value Description                                                                             |
-  |--------------------------|-------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------|
-  | `:addresses`             | `[Explorer.Chain.Address.t()]`                                                                  | List of `t:Explorer.Chain.Address.t/0`s                                                       |
-  | `:balances`              | `[%{address_hash: Explorer.Chain.Hash.t(), block_number: Explorer.Chain.Block.block_number()}]` | List of `t:Explorer.Chain.Address.t/0`s                                                       |
-  | `:blocks`                | `[Explorer.Chain.Block.t()]`                                                                    | List of `t:Explorer.Chain.Block.t/0`s                                                         |
-  | `:internal_transactions` | `[%{index: non_neg_integer(), transaction_hash: Explorer.Chain.Hash.t()}]`                      | List of maps of the `t:Explorer.Chain.InternalTransaction.t/0` `index` and `transaction_hash` |
-  | `:logs`                  | `[Explorer.Chain.Log.t()]`                                                                      | List of `t:Explorer.Chain.Log.t/0`s                                                           |
-  | `:token_transfers`       | `[Explorer.Chain.TokenTransfer.t()]`                                                            | List of `t:Explor.Chain.TokenTransfer.t/0`s                                                   |
-  | `:tokens`                | `[Explorer.Chain.Token.t()]`                                                                    | List of `t:Explorer.Chain.token.t/0`s                                                         |
-  | `:transactions`          | `[Explorer.Chain.Hash.t()]`                                                                     | List of `t:Explorer.Chain.Transaction.t/0` `hash`                                             |
+  | Key                              | Value Type                                                                                      | Value Description                                                                                    |
+  |----------------------------------|-------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------|
+  | `:addresses`                     | `[Explorer.Chain.Address.t()]`                                                                  | List of `t:Explorer.Chain.Address.t/0`s                                                              |
+  | `:balances`                      | `[%{address_hash: Explorer.Chain.Hash.t(), block_number: Explorer.Chain.Block.block_number()}]` | List of `t:Explorer.Chain.Address.t/0`s                                                              |
+  | `:blocks`                        | `[Explorer.Chain.Block.t()]`                                                                    | List of `t:Explorer.Chain.Block.t/0`s                                                                |
+  | `:internal_transactions`         | `[%{index: non_neg_integer(), transaction_hash: Explorer.Chain.Hash.t()}]`                      | List of maps of the `t:Explorer.Chain.InternalTransaction.t/0` `index` and `transaction_hash`        |
+  | `:logs`                          | `[Explorer.Chain.Log.t()]`                                                                      | List of `t:Explorer.Chain.Log.t/0`s                                                                  |
+  | `:token_transfers`               | `[Explorer.Chain.TokenTransfer.t()]`                                                            | List of `t:Explor.Chain.TokenTransfer.t/0`s                                                          |
+  | `:tokens`                        | `[Explorer.Chain.Token.t()]`                                                                    | List of `t:Explorer.Chain.token.t/0`s                                                                |
+  | `:transactions`                  | `[Explorer.Chain.Hash.t()]`                                                                     | List of `t:Explorer.Chain.Transaction.t/0` `hash`                                                    |
+  | `:transaction_forks`             | `[%{uncle_hash: Explorer.Chain.Hash.t(), hash: Explorer.Chain.Hash.t()}]`                       | List of maps of the `t:Explorer.Chain.Transaction.Fork.t/0` `uncle_hash` and `hash`                  |
+  | `:block_second_degree_relations` | `[%{uncle_hash: Explorer.Chain.Hash.t(), nephew_hash: Explorer.Chain.Hash.t()]`                 | List of maps of the `t:Explorer.Chain.Block.SecondDegreeRelation.t/0` `uncle_hash` and `nephew_hash` |
 
   The params for each key are validated using the corresponding `Ecto.Schema` module's `changeset/2` function.  If there
   are errors, they are returned in `Ecto.Changeset.t`s, so that the original, invalid value can be reconstructed for any
@@ -165,7 +185,10 @@ defmodule Explorer.Chain.Import do
     * `:blocks`
       * `:params` - `list` of params for `Explorer.Chain.Block.changeset/2`.
       * `:timeout` - the timeout for inserting all blocks. Defaults to `#{@insert_blocks_timeout}` milliseconds.
-    * `:broacast` - Boolean flag indicating whether or not to broadcast the event.
+    * `:block_second_degree_relations`
+      * `:params` - `list` of params `for `Explorer.Chain.Block.SecondDegreeRelation.changeset/2`.
+      * `:timeout` - the timeout for inserting all uncles found in the params list.
+    * `:broadcast` - Boolean flag indicating whether or not to broadcast the event.
     * `:internal_transactions`
       * `:params` - `list` of params for `Explorer.Chain.InternalTransaction.changeset/2`.
       * `:timeout` - the timeout for inserting all internal transactions. Defaults to
@@ -198,6 +221,7 @@ defmodule Explorer.Chain.Import do
     * `:token_balances`
       * `:params` - `list` of params for `Explorer.Chain.TokenBalance.changeset/2`
     * `:timeout` - the timeout for `Repo.transaction`. Defaults to `#{@transaction_timeout}` milliseconds.
+
   """
   @spec all(all_options()) :: all_result()
   def all(options) when is_map(options) do
@@ -277,12 +301,14 @@ defmodule Explorer.Chain.Import do
     addresses: Address,
     balances: CoinBalance,
     blocks: Block,
+    block_second_degree_relations: Block.SecondDegreeRelation,
     internal_transactions: InternalTransaction,
     logs: Log,
     token_transfers: TokenTransfer,
     token_balances: TokenBalance,
     tokens: Token,
-    transactions: Transaction
+    transactions: Transaction,
+    transaction_forks: Transaction.Fork
   }
 
   defp ecto_schema_module_to_changes_list_map_to_multi(ecto_schema_module_to_changes_list_map, options)
@@ -294,7 +320,9 @@ defmodule Explorer.Chain.Import do
     |> run_addresses(ecto_schema_module_to_changes_list_map, full_options)
     |> run_balances(ecto_schema_module_to_changes_list_map, full_options)
     |> run_blocks(ecto_schema_module_to_changes_list_map, full_options)
+    |> run_block_second_degree_relations(ecto_schema_module_to_changes_list_map, full_options)
     |> run_transactions(ecto_schema_module_to_changes_list_map, full_options)
+    |> run_transaction_forks(ecto_schema_module_to_changes_list_map, full_options)
     |> run_internal_transactions(ecto_schema_module_to_changes_list_map, full_options)
     |> run_logs(ecto_schema_module_to_changes_list_map, full_options)
     |> run_tokens(ecto_schema_module_to_changes_list_map, full_options)
@@ -350,7 +378,8 @@ defmodule Explorer.Chain.Import do
       %{Block => blocks_changes} ->
         timestamps = Map.fetch!(options, :timestamps)
 
-        Multi.run(multi, :blocks, fn _ ->
+        multi
+        |> Multi.run(:blocks, fn _ ->
           insert_blocks(
             blocks_changes,
             %{
@@ -359,6 +388,16 @@ defmodule Explorer.Chain.Import do
             }
           )
         end)
+        |> Multi.run(:uncle_fetched_block_second_degree_relations, fn %{blocks: blocks} when is_list(blocks) ->
+          update_block_second_degree_relations(
+            blocks,
+            %{
+              timeout:
+                options[:block_second_degree_relations][:timeout] || @insert_block_second_degree_relations_timeout,
+              timestamps: timestamps
+            }
+          )
+        end)
 
       _ ->
         multi
@@ -388,6 +427,27 @@ defmodule Explorer.Chain.Import do
     end
   end
 
+  defp run_transaction_forks(multi, ecto_schema_module_to_changes_list_map, options)
+       when is_map(ecto_schema_module_to_changes_list_map) and is_map(options) do
+    case ecto_schema_module_to_changes_list_map do
+      %{Transaction.Fork => transaction_fork_changes} ->
+        %{timestamps: timestamps} = options
+
+        Multi.run(multi, :transaction_forks, fn _ ->
+          insert_transaction_forks(
+            transaction_fork_changes,
+            %{
+              timeout: options[:transaction_forks][:timeout] || @insert_transaction_forks_timeout,
+              timestamps: timestamps
+            }
+          )
+        end)
+
+      _ ->
+        multi
+    end
+  end
+
   defp run_internal_transactions(multi, ecto_schema_module_to_changes_list_map, options)
        when is_map(ecto_schema_module_to_changes_list_map) and is_map(options) do
     case ecto_schema_module_to_changes_list_map do
@@ -507,6 +567,25 @@ defmodule Explorer.Chain.Import do
     end
   end
 
+  defp run_block_second_degree_relations(multi, ecto_schema_module_to_changes_list, options)
+       when is_map(ecto_schema_module_to_changes_list) and is_map(options) do
+    case ecto_schema_module_to_changes_list do
+      %{Block.SecondDegreeRelation => block_second_degree_relations_changes} ->
+        Multi.run(multi, :block_second_degree_relations, fn _ ->
+          insert_block_second_degree_relations(
+            block_second_degree_relations_changes,
+            %{
+              timeout:
+                options[:block_second_degree_relations][:timeout] || @insert_block_second_degree_relations_timeout
+            }
+          )
+        end)
+
+      _ ->
+        multi
+    end
+  end
+
   @spec insert_addresses([%{hash: Hash.Address.t()}], %{
           required(:timeout) => timeout,
           required(:timestamps) => timestamps
@@ -645,7 +724,7 @@ defmodule Explorer.Chain.Import do
     {:ok, blocks} =
       insert_changes_list(
         ordered_changes_list,
-        conflict_target: :number,
+        conflict_target: :hash,
         on_conflict: :replace_all,
         for: Block,
         returning: true,
@@ -656,6 +735,32 @@ defmodule Explorer.Chain.Import do
     {:ok, blocks}
   end
 
+  @spec insert_block_second_degree_relations([map()], %{required(:timeout) => timeout}) ::
+          {:ok, %{nephew_hash: Hash.Full.t(), uncle_hash: Hash.Full.t()}} | {:error, [Changeset.t()]}
+  defp insert_block_second_degree_relations(changes_list, %{timeout: timeout}) when is_list(changes_list) do
+    # order so that row ShareLocks are grabbed in a consistent order
+    ordered_changes_list = Enum.sort_by(changes_list, &{&1.nephew_hash, &1.uncle_hash})
+
+    insert_changes_list(ordered_changes_list,
+      conflict_target: [:nephew_hash, :uncle_hash],
+      on_conflict:
+        from(
+          block_second_degree_relation in Block.SecondDegreeRelation,
+          update: [
+            set: [
+              uncle_fetched_at:
+                fragment("LEAST(?, EXCLUDED.uncle_fetched_at)", block_second_degree_relation.uncle_fetched_at)
+            ]
+          ]
+        ),
+      for: Block.SecondDegreeRelation,
+      returning: [:nephew_hash, :uncle_hash],
+      timeout: timeout,
+      # block_second_degree_relations doesn't have timestamps
+      timestamps: %{}
+    )
+  end
+
   @spec insert_internal_transactions([map], %{required(:timeout) => timeout, required(:timestamps) => timestamps}) ::
           {:ok, [%{index: non_neg_integer, transaction_hash: Hash.t()}]}
           | {:error, [Changeset.t()]}
@@ -828,6 +933,34 @@ defmodule Explorer.Chain.Import do
     {:ok, for(transaction <- transactions, do: transaction.hash)}
   end
 
+  @spec insert_transaction_forks([map()], %{
+          required(:timeout) => timeout,
+          required(:timestamps) => timestamps
+        }) :: {:ok, [%{uncle_hash: Hash.t(), hash: Hash.t()}]}
+  defp insert_transaction_forks(changes_list, %{timeout: timeout, timestamps: timestamps})
+       when is_list(changes_list) do
+    # order so that row ShareLocks are grabbed in a consistent order
+    ordered_changes_list = Enum.sort_by(changes_list, &{&1.uncle_hash, &1.hash})
+
+    insert_changes_list(
+      ordered_changes_list,
+      conflict_target: [:uncle_hash, :index],
+      on_conflict:
+        from(
+          transaction_fork in Transaction.Fork,
+          update: [
+            set: [
+              hash: fragment("EXCLUDED.hash")
+            ]
+          ]
+        ),
+      for: Transaction.Fork,
+      returning: [:uncle_hash, :hash],
+      timeout: timeout,
+      timestamps: timestamps
+    )
+  end
+
   defp insert_changes_list(changes_list, options) when is_list(changes_list) do
     ecto_schema_module = Keyword.fetch!(options, :for)
 
@@ -843,6 +976,34 @@ defmodule Explorer.Chain.Import do
     {:ok, inserted}
   end
 
+  defp update_block_second_degree_relations(blocks, %{timeout: timeout, timestamps: %{updated_at: updated_at}})
+       when is_list(blocks) do
+    ordered_uncle_hashes =
+      blocks
+      |> MapSet.new(& &1.hash)
+      |> Enum.sort()
+
+    query =
+      from(
+        bsdr in Block.SecondDegreeRelation,
+        where: bsdr.uncle_hash in ^ordered_uncle_hashes,
+        update: [
+          set: [
+            uncle_fetched_at: ^updated_at
+          ]
+        ]
+      )
+
+    try do
+      {_, result} = Repo.update_all(query, [], timeout: timeout)
+
+      {:ok, result}
+    rescue
+      postgrex_error in Postgrex.Error ->
+        {:error, %{exception: postgrex_error, uncle_hashes: ordered_uncle_hashes}}
+    end
+  end
+
   defp update_transactions(internal_transactions, %{
          timeout: timeout,
          timestamps: timestamps
diff --git a/apps/explorer/lib/explorer/chain/transaction.ex b/apps/explorer/lib/explorer/chain/transaction.ex
index 39881284af..16873920a9 100644
--- a/apps/explorer/lib/explorer/chain/transaction.ex
+++ b/apps/explorer/lib/explorer/chain/transaction.ex
@@ -20,7 +20,7 @@ defmodule Explorer.Chain.Transaction do
     Wei
   }
 
-  alias Explorer.Chain.Transaction.Status
+  alias Explorer.Chain.Transaction.{Fork, Status}
 
   @optional_attrs ~w(block_hash block_number created_contract_address_hash cumulative_gas_used error gas_used index
                      internal_transactions_indexed_at status to_address_hash)a
@@ -66,9 +66,12 @@ defmodule Explorer.Chain.Transaction do
   @type wei_per_gas :: Wei.t()
 
   @typedoc """
-   * `block` - the block in which this transaction was mined/validated.  `nil` when transaction is pending.
-   * `block_hash` - `block` foreign key. `nil` when transaction is pending.
-   * `block_number` - Denormalized `block` `number`. `nil` when transaction is pending.
+   * `block` - the block in which this transaction was mined/validated.  `nil` when transaction is pending or has only
+     been collated into one of the `uncles` in one of the `forks`.
+   * `block_hash` - `block` foreign key. `nil` when transaction is pending or has only been collated into one of the
+     `uncles` in one of the `forks`.
+   * `block_number` - Denormalized `block` `number`. `nil` when transaction is pending or has only been collated into
+     one of the `uncles` in one of the `forks`.
    * `created_contract_address` - belongs_to association to `address` corresponding to `created_contract_address_hash`.
    * `created_contract_address_hash` - Denormalized `internal_transaction` `created_contract_address_hash`
      populated only when `to_address_hash` is nil.
@@ -76,13 +79,16 @@ defmodule Explorer.Chain.Transaction do
      `transaction`'s `index`.  `nil` when transaction is pending.
    * `error` - the `error` from the last `t:Explorer.Chain.InternalTransaction.t/0` in `internal_transactions` that
      caused `status` to be `:error`.  Only set after `internal_transactions_index_at` is set AND if there was an error.
+   * `forks` - copies of this transactions that were collated into `uncles` not on the primary consensus of the chain.
    * `from_address` - the source of `value`
    * `from_address_hash` - foreign key of `from_address`
    * `gas` - Gas provided by the sender
    * `gas_price` - How much the sender is willing to pay for `gas`
-   * `gas_used` - the gas used for just `transaction`.  `nil` when transaction is pending.
+   * `gas_used` - the gas used for just `transaction`.  `nil` when transaction is pending or has only been collated into
+     one of the `uncles` in one of the `forks`.
    * `hash` - hash of contents of this transaction
-   * `index` - index of this transaction in `block`.  `nil` when transaction is pending.
+   * `index` - index of this transaction in `block`.  `nil` when transaction is pending or has only been collated into
+     one of the `uncles` in one of the `forks`.
    * `input`- data sent along with the transaction
    * `internal_transactions` - transactions (value transfers) created while executing contract used for this
      transaction
@@ -93,9 +99,11 @@ defmodule Explorer.Chain.Transaction do
        the X coordinate of a point R, modulo the curve order n.
    * `s` - The S field of the signature.  The (r, s) is the normal output of an ECDSA signature, where r is computed as
        the X coordinate of a point R, modulo the curve order n.
-   * `status` - whether the transaction was successfully mined or failed.  `nil` when transaction is pending.
+   * `status` - whether the transaction was successfully mined or failed.  `nil` when transaction is pending or has only
+     been collated into one of the `uncles` in one of the `forks.
    * `to_address` - sink of `value`
    * `to_address_hash` - `to_address` foreign key
+   * `uncles` - uncle blocks where `forks` were collated
    * `v` - The V field of the signature.
    * `value` - wei transferred from `from_address` to `to_address`
   """
@@ -107,6 +115,7 @@ defmodule Explorer.Chain.Transaction do
           created_contract_address_hash: Hash.Address.t() | nil,
           cumulative_gas_used: Gas.t() | nil,
           error: String.t() | nil,
+          forks: %Ecto.Association.NotLoaded{} | [Fork.t()],
           from_address: %Ecto.Association.NotLoaded{} | Address.t(),
           from_address_hash: Hash.Address.t(),
           gas: Gas.t(),
@@ -124,6 +133,7 @@ defmodule Explorer.Chain.Transaction do
           status: Status.t() | nil,
           to_address: %Ecto.Association.NotLoaded{} | Address.t() | nil,
           to_address_hash: Hash.Address.t() | nil,
+          uncles: %Ecto.Association.NotLoaded{} | [Block.t()],
           v: v(),
           value: Wei.t()
         }
@@ -149,6 +159,7 @@ defmodule Explorer.Chain.Transaction do
     timestamps()
 
     belongs_to(:block, Block, foreign_key: :block_hash, references: :hash, type: Hash.Full)
+    has_many(:forks, Fork, foreign_key: :hash)
 
     belongs_to(
       :from_address,
@@ -170,6 +181,8 @@ defmodule Explorer.Chain.Transaction do
       type: Hash.Address
     )
 
+    has_many(:uncles, through: [:forks, :uncle])
+
     belongs_to(
       :created_contract_address,
       Address,
diff --git a/apps/explorer/lib/explorer/chain/transaction/fork.ex b/apps/explorer/lib/explorer/chain/transaction/fork.ex
new file mode 100644
index 0000000000..74e2fc921d
--- /dev/null
+++ b/apps/explorer/lib/explorer/chain/transaction/fork.ex
@@ -0,0 +1,63 @@
+defmodule Explorer.Chain.Transaction.Fork do
+  @moduledoc """
+  A transaction fork has the same `hash` as a `t:Explorer.Chain.Transaction.t/0`, but associates that `hash` with a
+  non-consensus uncle `t:Explorer.Chain.Block.t/0` instead of the consensus block linked in the
+  `t:Explorer.Chain.Transaction.t/0` `block_hash`.
+  """
+
+  use Explorer.Schema
+
+  alias Explorer.Chain.{Block, Hash, Transaction}
+
+  @optional_attrs ~w()a
+  @required_attrs ~w(hash index uncle_hash)a
+  @allowed_attrs @optional_attrs ++ @required_attrs
+
+  @typedoc """
+   * `hash` - hash of contents of this transaction
+   * `index` - index of this transaction in `uncle`.
+   * `transaction` - the data shared between all forks and the consensus transaction.
+   * `uncle` - the block in which this transaction was mined/validated.
+   * `uncle_hash` - `uncle` foreign key.
+  """
+  @type t :: %__MODULE__{
+          hash: Hash.t(),
+          index: Transaction.transaction_index(),
+          transaction: %Ecto.Association.NotLoaded{} | Transaction.t(),
+          uncle: %Ecto.Association.NotLoaded{} | Block.t(),
+          uncle_hash: Hash.t()
+        }
+
+  @primary_key false
+  schema "transaction_forks" do
+    field(:index, :integer)
+
+    timestamps()
+
+    belongs_to(:transaction, Transaction, foreign_key: :hash, references: :hash, type: Hash.Full)
+    belongs_to(:uncle, Block, foreign_key: :uncle_hash, references: :hash, type: Hash.Full)
+  end
+
+  @doc """
+  All fields are required for transaction fork
+
+      iex> changeset = Fork.changeset(
+      ...>   %Fork{},
+      ...>   %{
+      ...>     hash: "0x3a3eb134e6792ce9403ea4188e5e79693de9e4c94e499db132be086400da79e6",
+      ...>     index: 1,
+      ...>     uncle_hash: "0xe52d77084cab13a4e724162bcd8c6028e5ecfaa04d091ee476e96b9958ed6b48"
+      ...>   }
+      ...> )
+      iex> changeset.valid?
+      true
+
+  """
+  def changeset(%__MODULE__{} = fork, attrs \\ %{}) do
+    fork
+    |> cast(attrs, @allowed_attrs)
+    |> validate_required(@required_attrs)
+    |> assoc_constraint(:transaction)
+    |> assoc_constraint(:uncle)
+  end
+end
diff --git a/apps/explorer/lib/explorer/smart_contract/reader.ex b/apps/explorer/lib/explorer/smart_contract/reader.ex
index 523b2bca8b..efdf7360cd 100644
--- a/apps/explorer/lib/explorer/smart_contract/reader.ex
+++ b/apps/explorer/lib/explorer/smart_contract/reader.ex
@@ -114,7 +114,7 @@ defmodule Explorer.SmartContract.Reader do
     |> decode_results(abi, functions)
   rescue
     error ->
-      format_error(functions, error.message)
+      format_error(functions, error)
   end
 
   defp decode_results({:ok, results}, abi, functions), do: Encoder.decode_abi_results(results, abi, functions)
@@ -123,7 +123,7 @@ defmodule Explorer.SmartContract.Reader do
     format_error(functions, "Bad Gateway")
   end
 
-  defp format_error(functions, message) do
+  defp format_error(functions, message) when is_binary(message) do
     functions
     |> Enum.map(fn {function_name, _args} ->
       %{function_name => {:error, message}}
@@ -131,6 +131,14 @@ defmodule Explorer.SmartContract.Reader do
     |> List.first()
   end
 
+  defp format_error(functions, %{message: error_message}) do
+    format_error(functions, error_message)
+  end
+
+  defp format_error(functions, error) do
+    format_error(functions, Exception.message(error))
+  end
+
   @doc """
   Given the encoded data that references a function and its arguments in the blockchain, as well as the contract address, returns what EthereumJSONRPC.execute_contract_functions expects.
   """
diff --git a/apps/explorer/priv/repo/migrations/20180117221922_create_blocks.exs b/apps/explorer/priv/repo/migrations/20180117221922_create_blocks.exs
index 468dfd1bd5..faacee0d13 100644
--- a/apps/explorer/priv/repo/migrations/20180117221922_create_blocks.exs
+++ b/apps/explorer/priv/repo/migrations/20180117221922_create_blocks.exs
@@ -3,6 +3,7 @@ defmodule Explorer.Repo.Migrations.CreateBlocks do
 
   def change do
     create table(:blocks, primary_key: false) do
+      add(:consensus, :boolean, null: false)
       add(:difficulty, :numeric, precision: 50)
       add(:gas_limit, :numeric, precision: 100, null: false)
       add(:gas_used, :numeric, precision: 100, null: false)
@@ -22,7 +23,7 @@ defmodule Explorer.Repo.Migrations.CreateBlocks do
     end
 
     create(index(:blocks, [:timestamp]))
-    create(unique_index(:blocks, [:parent_hash]))
-    create(unique_index(:blocks, [:number]))
+    create(index(:blocks, [:parent_hash], unique: true, where: ~s(consensus), name: :one_consensus_child_per_parent))
+    create(index(:blocks, [:number], unique: true, where: ~s(consensus), name: :one_consensus_block_at_height))
   end
 end
diff --git a/apps/explorer/priv/repo/migrations/20180917182319_create_block_second_degree_relations.exs b/apps/explorer/priv/repo/migrations/20180917182319_create_block_second_degree_relations.exs
new file mode 100644
index 0000000000..b6477a3aae
--- /dev/null
+++ b/apps/explorer/priv/repo/migrations/20180917182319_create_block_second_degree_relations.exs
@@ -0,0 +1,22 @@
+defmodule Explorer.Repo.Migrations.CreateBlockSecondDegreeRelations do
+  use Ecto.Migration
+
+  def change do
+    create table(:block_second_degree_relations, primary_key: false) do
+      add(:nephew_hash, references(:blocks, column: :hash, type: :bytea), null: false)
+      add(:uncle_hash, :bytea, null: false)
+      add(:uncle_fetched_at, :utc_datetime, default: fragment("NULL"), null: true)
+    end
+
+    create(unique_index(:block_second_degree_relations, [:nephew_hash, :uncle_hash], name: :nephew_hash_to_uncle_hash))
+
+    create(
+      unique_index(:block_second_degree_relations, [:nephew_hash, :uncle_hash],
+        name: :unfetched_uncles,
+        where: "uncle_fetched_at IS NULL"
+      )
+    )
+
+    create(unique_index(:block_second_degree_relations, [:uncle_hash, :nephew_hash], name: :uncle_hash_to_nephew_hash))
+  end
+end
diff --git a/apps/explorer/priv/repo/migrations/20180918200001_create_transaction_fork.exs b/apps/explorer/priv/repo/migrations/20180918200001_create_transaction_fork.exs
new file mode 100644
index 0000000000..06e77dcd41
--- /dev/null
+++ b/apps/explorer/priv/repo/migrations/20180918200001_create_transaction_fork.exs
@@ -0,0 +1,16 @@
+defmodule Explorer.Repo.Migrations.CreateTransactionBlockUncles do
+  use Ecto.Migration
+
+  def change do
+    create table(:transaction_forks, primary_key: false) do
+      add(:hash, references(:transactions, column: :hash, on_delete: :delete_all, type: :bytea), null: false)
+      add(:index, :integer, null: false)
+      add(:uncle_hash, references(:blocks, column: :hash, on_delete: :delete_all, type: :bytea), null: false)
+
+      timestamps()
+    end
+
+    create(index(:transaction_forks, :uncle_hash))
+    create(unique_index(:transaction_forks, [:uncle_hash, :index]))
+  end
+end
diff --git a/apps/explorer/test/explorer/chain/block/second_degree_relation_test.exs b/apps/explorer/test/explorer/chain/block/second_degree_relation_test.exs
new file mode 100644
index 0000000000..66f1097f16
--- /dev/null
+++ b/apps/explorer/test/explorer/chain/block/second_degree_relation_test.exs
@@ -0,0 +1,50 @@
+defmodule Explorer.Chain.Block.SecondDegreeRelationTest do
+  use Explorer.DataCase, async: true
+
+  alias Ecto.Changeset
+  alias Explorer.Chain.Block
+
+  describe "changeset/2" do
+    test "requires hash and nephew_hash" do
+      assert %Changeset{valid?: false} =
+               changeset = Block.SecondDegreeRelation.changeset(%Block.SecondDegreeRelation{}, %{})
+
+      assert changeset_errors(changeset) == %{nephew_hash: ["can't be blank"], uncle_hash: ["can't be blank"]}
+
+      assert %Changeset{valid?: true} =
+               Block.SecondDegreeRelation.changeset(%Block.SecondDegreeRelation{}, %{
+                 nephew_hash: block_hash(),
+                 uncle_hash: block_hash()
+               })
+    end
+
+    test "allows uncle_fetched_at" do
+      assert %Changeset{changes: %{uncle_fetched_at: _}, valid?: true} =
+               Block.SecondDegreeRelation.changeset(%Block.SecondDegreeRelation{}, %{
+                 nephew_hash: block_hash(),
+                 uncle_hash: block_hash(),
+                 uncle_fetched_at: DateTime.utc_now()
+               })
+    end
+
+    test "enforces foreign key constraint on nephew_hash" do
+      assert {:error, %Changeset{valid?: false} = changeset} =
+               %Block.SecondDegreeRelation{}
+               |> Block.SecondDegreeRelation.changeset(%{nephew_hash: block_hash(), uncle_hash: block_hash()})
+               |> Repo.insert()
+
+      assert changeset_errors(changeset) == %{nephew_hash: ["does not exist"]}
+    end
+
+    test "enforces unique constraints on {nephew_hash, uncle_hash}" do
+      %Block.SecondDegreeRelation{nephew_hash: nephew_hash, uncle_hash: hash} = insert(:block_second_degree_relation)
+
+      assert {:error, %Changeset{valid?: false} = changeset} =
+               %Block.SecondDegreeRelation{}
+               |> Block.SecondDegreeRelation.changeset(%{nephew_hash: nephew_hash, uncle_hash: hash})
+               |> Repo.insert()
+
+      assert changeset_errors(changeset) == %{uncle_hash: ["has already been taken"]}
+    end
+  end
+end
diff --git a/apps/explorer/test/explorer/chain/import_test.exs b/apps/explorer/test/explorer/chain/import_test.exs
index dd73ea74b7..1e39d49983 100644
--- a/apps/explorer/test/explorer/chain/import_test.exs
+++ b/apps/explorer/test/explorer/chain/import_test.exs
@@ -24,6 +24,7 @@ defmodule Explorer.Chain.ImportTest do
       blocks: %{
         params: [
           %{
+            consensus: true,
             difficulty: 340_282_366_920_938_463_463_374_607_431_768_211_454,
             gas_limit: 6_946_336,
             gas_used: 50450,
@@ -516,6 +517,7 @@ defmodule Explorer.Chain.ImportTest do
         blocks: %{
           params: [
             %{
+              consensus: true,
               difficulty: 340_282_366_920_938_463_463_374_607_431_768_211_454,
               gas_limit: 6_926_030,
               gas_used: 269_607,
@@ -605,6 +607,7 @@ defmodule Explorer.Chain.ImportTest do
         blocks: %{
           params: [
             %{
+              consensus: true,
               difficulty: 340_282_366_920_938_463_463_374_607_431_768_211_454,
               gas_limit: 6_926_030,
               gas_used: 269_607,
@@ -698,6 +701,7 @@ defmodule Explorer.Chain.ImportTest do
         blocks: %{
           params: [
             %{
+              consensus: true,
               difficulty: 340_282_366_920_938_463_463_374_607_431_768_211_454,
               gas_limit: 6_926_030,
               gas_used: 269_607,
@@ -788,6 +792,7 @@ defmodule Explorer.Chain.ImportTest do
                  blocks: %{
                    params: [
                      %{
+                       consensus: true,
                        difficulty: 340_282_366_920_938_463_463_374_607_431_768_211_454,
                        gas_limit: 6_946_336,
                        gas_used: 50450,
@@ -911,6 +916,7 @@ defmodule Explorer.Chain.ImportTest do
                  blocks: %{
                    params: [
                      %{
+                       consensus: true,
                        difficulty: 242_354_495_292_210,
                        gas_limit: 4_703_218,
                        gas_used: 1_009_480,
@@ -924,6 +930,7 @@ defmodule Explorer.Chain.ImportTest do
                        total_difficulty: 415_641_295_487_918_824_165
                      },
                      %{
+                       consensus: true,
                        difficulty: 247_148_243_947_046,
                        gas_limit: 4_704_624,
                        gas_used: 363_000,
@@ -1047,5 +1054,70 @@ defmodule Explorer.Chain.ImportTest do
       assert %Transaction{status: :error, error: "Out of gas"} =
                Repo.get(Transaction, "0xab349efbe1ddc6d85d84a993aa52bdaadce66e8ee166dd10013ce3f2a94ca724")
     end
+
+    test "uncles record their transaction indexes in transactions_forks" do
+      miner_hash = address_hash()
+      from_address_hash = address_hash()
+      transaction_hash = transaction_hash()
+      uncle_hash = block_hash()
+
+      assert {:ok, _} =
+               Import.all(%{
+                 addresses: %{
+                   params: [
+                     %{hash: miner_hash},
+                     %{hash: from_address_hash}
+                   ]
+                 },
+                 blocks: %{
+                   params: [
+                     %{
+                       consensus: false,
+                       difficulty: 0,
+                       gas_limit: 21_000,
+                       gas_used: 21_000,
+                       hash: uncle_hash,
+                       miner_hash: miner_hash,
+                       nonce: 0,
+                       number: 0,
+                       parent_hash: block_hash(),
+                       size: 0,
+                       timestamp: DateTime.utc_now(),
+                       total_difficulty: 0
+                     }
+                   ]
+                 },
+                 transactions: %{
+                   params: [
+                     %{
+                       block_hash: nil,
+                       block_number: nil,
+                       from_address_hash: from_address_hash,
+                       gas: 21_000,
+                       gas_price: 1,
+                       hash: transaction_hash,
+                       input: "0x",
+                       nonce: 0,
+                       r: 0,
+                       s: 0,
+                       v: 0,
+                       value: 0
+                     }
+                   ],
+                   on_conflict: :replace_all
+                 },
+                 transaction_forks: %{
+                   params: [
+                     %{
+                       uncle_hash: uncle_hash,
+                       index: 0,
+                       hash: transaction_hash
+                     }
+                   ]
+                 }
+               })
+
+      assert Repo.aggregate(Transaction.Fork, :count, :hash) == 1
+    end
   end
 end
diff --git a/apps/explorer/test/explorer/chain/transaction/fork_test.exs b/apps/explorer/test/explorer/chain/transaction/fork_test.exs
new file mode 100644
index 0000000000..d5028af6ab
--- /dev/null
+++ b/apps/explorer/test/explorer/chain/transaction/fork_test.exs
@@ -0,0 +1,23 @@
+defmodule Explorer.Chain.Transaction.ForkTest do
+  use Explorer.DataCase
+
+  alias Ecto.Changeset
+  alias Explorer.Chain.Transaction.Fork
+
+  doctest Fork
+
+  test "a transaction fork cannot be inserted if the corresponding transaction does not exist" do
+    assert %Changeset{valid?: true} = changeset = Fork.changeset(%Fork{}, params_for(:transaction_fork))
+
+    assert {:error, %Changeset{errors: [transaction: {"does not exist", []}]}} = Repo.insert(changeset)
+  end
+
+  test "a transaction fork cannot be inserted if the corresponding uncle does not exist" do
+    transaction = insert(:transaction)
+
+    assert %Changeset{valid?: true} =
+             changeset = Fork.changeset(%Fork{}, %{hash: transaction.hash, index: 0, uncle_hash: block_hash()})
+
+    assert {:error, %Changeset{errors: [uncle: {"does not exist", []}]}} = Repo.insert(changeset)
+  end
+end
diff --git a/apps/explorer/test/explorer/chain_test.exs b/apps/explorer/test/explorer/chain_test.exs
index 0c0ed7ec18..cc196e8af2 100644
--- a/apps/explorer/test/explorer/chain_test.exs
+++ b/apps/explorer/test/explorer/chain_test.exs
@@ -1,6 +1,9 @@
 defmodule Explorer.ChainTest do
   use Explorer.DataCase
 
+  require Ecto.Query
+
+  import Ecto.Query
   import Explorer.Factory
 
   alias Explorer.{Chain, Factory, PagingOptions, Repo}
@@ -670,6 +673,7 @@ defmodule Explorer.ChainTest do
       blocks: %{
         params: [
           %{
+            consensus: true,
             difficulty: 340_282_366_920_938_463_463_374_607_431_768_211_454,
             gas_limit: 6_946_336,
             gas_used: 50450,
@@ -684,6 +688,14 @@ defmodule Explorer.ChainTest do
           }
         ]
       },
+      block_second_degree_relations: %{
+        params: [
+          %{
+            nephew_hash: "0xf6b4b8c88df3ebd252ec476328334dc026cf66606a84fb769b3d3cbccc8471bd",
+            uncle_hash: "0xf6b4b8c88df3ebd252ec476328334dc026cf66606a84fb769b3d3cbccc8471be"
+          }
+        ]
+      },
       broadcast: true,
       internal_transactions: %{
         params: [
@@ -817,6 +829,7 @@ defmodule Explorer.ChainTest do
                 ],
                 blocks: [
                   %Block{
+                    consensus: true,
                     difficulty: ^difficulty,
                     gas_limit: ^gas_limit,
                     gas_used: ^gas_used,
@@ -2259,6 +2272,20 @@ defmodule Explorer.ChainTest do
     end
   end
 
+  describe "stream_unfetched_uncle_hashes/2" do
+    test "does not return uncle hashes where t:Explorer.Chain.Block.SecondDegreeRelation.t/0 unclue_fetched_at is not nil" do
+      %Block.SecondDegreeRelation{nephew: %Block{}, uncle_hash: uncle_hash} = insert(:block_second_degree_relation)
+
+      assert {:ok, [^uncle_hash]} = Explorer.Chain.stream_unfetched_uncle_hashes([], &[&1 | &2])
+
+      query = from(bsdr in Block.SecondDegreeRelation, where: bsdr.uncle_hash == ^uncle_hash)
+
+      assert {1, _} = Repo.update_all(query, set: [uncle_fetched_at: DateTime.utc_now()])
+
+      assert {:ok, []} = Explorer.Chain.stream_unfetched_uncle_hashes([], &[&1 | &2])
+    end
+  end
+
   test "total_supply/0" do
     height = 2_000_000
     insert(:block, number: height)
diff --git a/apps/explorer/test/explorer/smart_contract/reader_test.exs b/apps/explorer/test/explorer/smart_contract/reader_test.exs
index 77f0874c08..5452c10e2d 100644
--- a/apps/explorer/test/explorer/smart_contract/reader_test.exs
+++ b/apps/explorer/test/explorer/smart_contract/reader_test.exs
@@ -82,6 +82,24 @@ defmodule Explorer.SmartContract.ReaderTest do
 
       assert %{"get" => {:error, "Bad Gateway"}} = response
     end
+
+    test "handles other types of errors" do
+      smart_contract = build(:smart_contract)
+      contract_address_hash = Hash.to_string(smart_contract.address_hash)
+      abi = smart_contract.abi
+
+      expect(
+        EthereumJSONRPC.Mox,
+        :json_rpc,
+        fn [%{id: _, method: _, params: [%{data: _, to: _}]}], _options ->
+          raise FunctionClauseError
+        end
+      )
+
+      response = Reader.query_contract(contract_address_hash, abi, %{"get" => []})
+
+      assert %{"get" => {:error, "no function clause matches"}} = response
+    end
   end
 
   describe "query_verified_contract/2" do
diff --git a/apps/explorer/test/support/factory.ex b/apps/explorer/test/support/factory.ex
index 4e4972e45d..e4c05a4abd 100644
--- a/apps/explorer/test/support/factory.ex
+++ b/apps/explorer/test/support/factory.ex
@@ -105,6 +105,7 @@ defmodule Explorer.Factory do
 
   def block_factory do
     %Block{
+      consensus: true,
       number: block_number(),
       hash: block_hash(),
       parent_hash: block_hash(),
@@ -132,6 +133,13 @@ defmodule Explorer.Factory do
     sequence("block_number", & &1)
   end
 
+  def block_second_degree_relation_factory do
+    %Block.SecondDegreeRelation{
+      uncle_hash: block_hash(),
+      nephew: build(:block)
+    }
+  end
+
   def with_block(%Transaction{index: nil} = transaction) do
     with_block(transaction, insert(:block))
   end
@@ -420,6 +428,14 @@ defmodule Explorer.Factory do
     data(:transaction_input)
   end
 
+  def transaction_fork_factory do
+    %Transaction.Fork{
+      hash: transaction_hash(),
+      index: 0,
+      uncle_hash: block_hash()
+    }
+  end
+
   def smart_contract_factory() do
     %SmartContract{
       address_hash: insert(:address).hash,
diff --git a/apps/indexer/lib/indexer/address/coin_balances.ex b/apps/indexer/lib/indexer/address/coin_balances.ex
index 895810aef7..6955b085b4 100644
--- a/apps/indexer/lib/indexer/address/coin_balances.ex
+++ b/apps/indexer/lib/indexer/address/coin_balances.ex
@@ -32,6 +32,10 @@ defmodule Indexer.Address.CoinBalances do
     Enum.reduce(transactions_params, initial, &transactions_params_reducer/2)
   end
 
+  defp reducer({:block_second_degree_relations_params, block_second_degree_relations_params}, initial)
+       when is_list(block_second_degree_relations_params),
+       do: initial
+
   defp internal_transactions_params_reducer(%{block_number: block_number} = internal_transaction_params, acc)
        when is_integer(block_number) do
     case internal_transaction_params do
diff --git a/apps/indexer/lib/indexer/block/catchup/fetcher.ex b/apps/indexer/lib/indexer/block/catchup/fetcher.ex
index 4dd7d97f44..b387468f63 100644
--- a/apps/indexer/lib/indexer/block/catchup/fetcher.ex
+++ b/apps/indexer/lib/indexer/block/catchup/fetcher.ex
@@ -105,7 +105,10 @@ defmodule Indexer.Block.Catchup.Fetcher do
     {async_import_remaning_block_data_options, chain_import_options} =
       Map.split(options, @async_import_remaning_block_data_options)
 
-    with {:ok, results} = ok <- Chain.import(chain_import_options) do
+    with {:ok, results} = ok <-
+           chain_import_options
+           |> put_in([:blocks, :params, Access.all(), :consensus], true)
+           |> Chain.import() do
       async_import_remaining_block_data(
         results,
         async_import_remaning_block_data_options
@@ -117,6 +120,7 @@ defmodule Indexer.Block.Catchup.Fetcher do
 
   defp async_import_remaining_block_data(
          %{
+           block_second_degree_relations: block_second_degree_relations,
            transactions: transaction_hashes,
            addresses: address_hashes,
            tokens: tokens,
@@ -146,6 +150,10 @@ defmodule Indexer.Block.Catchup.Fetcher do
     |> Token.Fetcher.async_fetch()
 
     TokenBalance.Fetcher.async_fetch(token_balances)
+
+    block_second_degree_relations
+    |> Enum.map(& &1.uncle_hash)
+    |> Block.Uncle.Fetcher.async_fetch_blocks()
   end
 
   defp stream_fetch_and_import(%__MODULE__{blocks_concurrency: blocks_concurrency} = state, sequence)
diff --git a/apps/indexer/lib/indexer/block/fetcher.ex b/apps/indexer/lib/indexer/block/fetcher.ex
index ee2485c8ab..312b76cc47 100644
--- a/apps/indexer/lib/indexer/block/fetcher.ex
+++ b/apps/indexer/lib/indexer/block/fetcher.ex
@@ -26,6 +26,7 @@ defmodule Indexer.Block.Fetcher do
                 addresses: Import.addresses_options(),
                 balances: Import.balances_options(),
                 blocks: Import.blocks_options(),
+                block_second_degree_relations: Import.block_second_degree_relations_options(),
                 broadcast: boolean,
                 logs: Import.logs_options(),
                 receipts: Import.receipts_options(),
@@ -91,7 +92,11 @@ defmodule Indexer.Block.Fetcher do
       when broadcast in ~w(true false)a and callback_module != nil do
     with {:blocks, {:ok, next, result}} <-
            {:blocks, EthereumJSONRPC.fetch_blocks_by_range(range, json_rpc_named_arguments)},
-         %{blocks: blocks, transactions: transactions_without_receipts} = result,
+         %{
+           blocks: blocks,
+           transactions: transactions_without_receipts,
+           block_second_degree_relations: block_second_degree_relations
+         } = result,
          {:receipts, {:ok, receipt_params}} <- {:receipts, Receipts.fetch(state, transactions_without_receipts)},
          %{logs: logs, receipts: receipts} = receipt_params,
          transactions_with_receipts = Receipts.put(transactions_without_receipts, receipts),
@@ -111,14 +116,14 @@ defmodule Indexer.Block.Fetcher do
            }),
          token_balances = TokenBalances.params_set(%{token_transfers_params: token_transfers}),
          {:ok, inserted} <-
-           import_range(
+           __MODULE__.import(
              state,
              %{
-               range: range,
                addresses: %{params: addresses},
                balances: %{params: coin_balances_params_set},
                token_balances: %{params: token_balances},
                blocks: %{params: blocks},
+               block_second_degree_relations: %{params: block_second_degree_relations},
                logs: %{params: logs},
                receipts: %{params: receipts},
                token_transfers: %{params: token_transfers},
@@ -134,11 +139,11 @@ defmodule Indexer.Block.Fetcher do
     end
   end
 
-  defp import_range(
-         %__MODULE__{broadcast: broadcast, callback_module: callback_module} = state,
-         options
-       )
-       when is_map(options) do
+  def import(
+        %__MODULE__{broadcast: broadcast, callback_module: callback_module} = state,
+        options
+      )
+      when is_map(options) do
     {address_hash_to_fetched_balance_block_number, import_options} =
       pop_address_hash_to_fetched_balance_block_number(options)
 
diff --git a/apps/indexer/lib/indexer/block/realtime/fetcher.ex b/apps/indexer/lib/indexer/block/realtime/fetcher.ex
index f55a298a69..aac96a77e8 100644
--- a/apps/indexer/lib/indexer/block/realtime/fetcher.ex
+++ b/apps/indexer/lib/indexer/block/realtime/fetcher.ex
@@ -104,6 +104,7 @@ defmodule Indexer.Block.Realtime.Fetcher do
            options
            |> Map.drop(@import_options)
            |> put_in([:addresses, :params], balances_addresses_params)
+           |> put_in([:blocks, :params, Access.all(), :consensus], true)
            |> put_in([Access.key(:balances, %{}), :params], balances_params)
            |> put_in([Access.key(:internal_transactions, %{}), :params], internal_transactions_params)
            |> put_in([Access.key(:token_balances), :params], token_balances),
@@ -124,6 +125,9 @@ defmodule Indexer.Block.Realtime.Fetcher do
   end
 
   def fetch_and_import_block(block_number_to_fetch, block_fetcher) do
+    # Wait half a second to give Parity/Geth time to sync.
+    :timer.sleep(500)
+
     case fetch_and_import_range(block_fetcher, block_number_to_fetch..block_number_to_fetch) do
       {:ok, {_inserted, _next}} ->
         Logger.debug(fn ->
@@ -169,10 +173,14 @@ defmodule Indexer.Block.Realtime.Fetcher do
     end
   end
 
-  defp async_import_remaining_block_data(%{tokens: tokens}) do
+  defp async_import_remaining_block_data(%{block_second_degree_relations: block_second_degree_relations, tokens: tokens}) do
     tokens
     |> Enum.map(& &1.contract_address_hash)
     |> Token.Fetcher.async_fetch()
+
+    block_second_degree_relations
+    |> Enum.map(& &1.uncle_hash)
+    |> Block.Uncle.Fetcher.async_fetch_blocks()
   end
 
   defp internal_transactions(
diff --git a/apps/indexer/lib/indexer/block/supervisor.ex b/apps/indexer/lib/indexer/block/supervisor.ex
index fcb8245ecd..a9c2ab8728 100644
--- a/apps/indexer/lib/indexer/block/supervisor.ex
+++ b/apps/indexer/lib/indexer/block/supervisor.ex
@@ -4,7 +4,7 @@ defmodule Indexer.Block.Supervisor do
   """
 
   alias Indexer.Block
-  alias Indexer.Block.{Catchup, Realtime}
+  alias Indexer.Block.{Catchup, Realtime, Uncle}
 
   use Supervisor
 
@@ -27,7 +27,8 @@ defmodule Indexer.Block.Supervisor do
          [
            %{block_fetcher: block_fetcher, subscribe_named_arguments: subscribe_named_arguments},
            [name: Realtime.Supervisor]
-         ]}
+         ]},
+        {Uncle.Supervisor, [[block_fetcher: block_fetcher], [name: Uncle.Supervisor]]}
       ],
       strategy: :one_for_one
     )
diff --git a/apps/indexer/lib/indexer/block/uncle/fetcher.ex b/apps/indexer/lib/indexer/block/uncle/fetcher.ex
new file mode 100644
index 0000000000..032679b12c
--- /dev/null
+++ b/apps/indexer/lib/indexer/block/uncle/fetcher.ex
@@ -0,0 +1,154 @@
+defmodule Indexer.Block.Uncle.Fetcher do
+  @moduledoc """
+  Fetches `t:Explorer.Chain.Block.t/0` by `hash` and updates `t:Explorer.Chain.Block.SecondDegreeRelation.t/0`
+  `uncle_fetched_at` where the `uncle_hash` matches `hash`.
+  """
+
+  require Logger
+
+  alias Explorer.Chain
+  alias Explorer.Chain.Hash
+  alias Indexer.{AddressExtraction, Block, BufferedTask}
+
+  @behaviour Block.Fetcher
+  @behaviour BufferedTask
+
+  @defaults [
+    flush_interval: :timer.seconds(3),
+    max_batch_size: 10,
+    max_concurrency: 10,
+    init_chunk_size: 1000,
+    task_supervisor: Indexer.Block.Uncle.TaskSupervisor
+  ]
+
+  @doc """
+  Asynchronously fetches `t:Explorer.Chain.Block.t/0` for the given `hashes` and updates
+  `t:Explorer.Chain.Block.SecondDegreeRelation.t/0` `block_fetched_at`.
+  """
+  @spec async_fetch_blocks([Hash.Full.t()]) :: :ok
+  def async_fetch_blocks(block_hashes) when is_list(block_hashes) do
+    BufferedTask.buffer(
+      __MODULE__,
+      block_hashes
+      |> Enum.map(&to_string/1)
+      |> Enum.uniq()
+    )
+  end
+
+  @doc false
+  def child_spec([init_options, gen_server_options]) when is_list(init_options) do
+    {state, mergeable_init_options} = Keyword.pop(init_options, :block_fetcher)
+
+    unless state do
+      raise ArgumentError,
+            ":json_rpc_named_arguments must be provided to `#{__MODULE__}.child_spec " <>
+              "to allow for json_rpc calls when running."
+    end
+
+    merged_init_options =
+      @defaults
+      |> Keyword.merge(mergeable_init_options)
+      |> Keyword.put(:state, %Block.Fetcher{state | broadcast: false, callback_module: __MODULE__})
+
+    Supervisor.child_spec({BufferedTask, [{__MODULE__, merged_init_options}, gen_server_options]}, id: __MODULE__)
+  end
+
+  @impl BufferedTask
+  def init(initial, reducer, _) do
+    {:ok, final} =
+      Chain.stream_unfetched_uncle_hashes(initial, fn uncle_hash, acc ->
+        uncle_hash
+        |> to_string()
+        |> reducer.(acc)
+      end)
+
+    final
+  end
+
+  @impl BufferedTask
+  def run(hashes, _retries, %Block.Fetcher{json_rpc_named_arguments: json_rpc_named_arguments} = block_fetcher) do
+    # the same block could be included as an uncle on multiple blocks, but we only want to fetch it once
+    unique_hashes = Enum.uniq(hashes)
+
+    Logger.debug(fn -> "fetching #{length(unique_hashes)} uncle blocks" end)
+
+    case EthereumJSONRPC.fetch_blocks_by_hash(unique_hashes, json_rpc_named_arguments) do
+      {:ok,
+       %{
+         blocks: blocks_params,
+         transactions: transactions_params,
+         block_second_degree_relations: block_second_degree_relations_params
+       }} ->
+        addresses_params =
+          AddressExtraction.extract_addresses(%{blocks: blocks_params, transactions: transactions_params})
+
+        {:ok, _} =
+          Block.Fetcher.import(block_fetcher, %{
+            addresses: %{params: addresses_params},
+            blocks: %{params: blocks_params},
+            block_second_degree_relations: %{params: block_second_degree_relations_params},
+            transactions: %{params: transactions_params, on_conflict: :nothing}
+          })
+
+        :ok
+
+      {:error, reason} ->
+        Logger.debug(fn -> "failed to fetch #{length(unique_hashes)} uncle blocks, #{inspect(reason)}" end)
+        {:retry, unique_hashes}
+    end
+  end
+
+  @impl Block.Fetcher
+  def import(_, options) when is_map(options) do
+    with {:ok, %{block_second_degree_relations: block_second_degree_relations}} = ok <-
+           options
+           |> uncle_blocks()
+           |> fork_transactions()
+           |> Chain.import() do
+      # * CoinBalance.Fetcher.async_fetch_balances is not called because uncles don't affect balances
+      # * InternalTransaction.Fetcher.async_fetch is not called because internal transactions are based on transaction
+      #   hash, which is shared with transaction on consensus blocks.
+      # * Token.Fetcher.async_fetch is not called because the tokens only matter on consensus blocks
+      # * TokenBalance.Fetcher.async_fetch is not called because it uses block numbers from consensus, not uncles
+
+      block_second_degree_relations
+      |> Enum.map(& &1.uncle_hash)
+      |> Block.Uncle.Fetcher.async_fetch_blocks()
+
+      ok
+    end
+  end
+
+  defp uncle_blocks(chain_import_options) do
+    put_in(chain_import_options, [:blocks, :params, Access.all(), :consensus], false)
+  end
+
+  defp fork_transactions(chain_import_options) do
+    transactions_params = chain_import_options[:transactions][:params] || []
+
+    chain_import_options
+    |> put_in([:transactions, :params], forked_transactions_params(transactions_params))
+    |> put_in([Access.key(:transaction_forks, %{}), :params], transaction_forks_params(transactions_params))
+  end
+
+  defp forked_transactions_params(transactions_params) do
+    # With no block_hash, there will be a collision for the same hash when a transaction is used in more than 1 uncle,
+    # so use MapSet to prevent duplicate row errors.
+    MapSet.new(transactions_params, fn transaction_params ->
+      Map.merge(transaction_params, %{
+        block_hash: nil,
+        block_number: nil,
+        index: nil,
+        gas_used: nil,
+        cumulative_gas_used: nil,
+        status: nil
+      })
+    end)
+  end
+
+  defp transaction_forks_params(transactions_params) do
+    Enum.map(transactions_params, fn %{block_hash: uncle_hash, index: index, hash: hash} ->
+      %{uncle_hash: uncle_hash, index: index, hash: hash}
+    end)
+  end
+end
diff --git a/apps/indexer/lib/indexer/block/uncle/supervisor.ex b/apps/indexer/lib/indexer/block/uncle/supervisor.ex
new file mode 100644
index 0000000000..87daf8bdc6
--- /dev/null
+++ b/apps/indexer/lib/indexer/block/uncle/supervisor.ex
@@ -0,0 +1,38 @@
+defmodule Indexer.Block.Uncle.Supervisor do
+  @moduledoc """
+  Supervises `Indexer.Block.Uncle.Fetcher`.
+  """
+
+  use Supervisor
+
+  alias Indexer.Block.Uncle.Fetcher
+
+  def child_spec([init_arguments]) do
+    child_spec([init_arguments, []])
+  end
+
+  def child_spec([_init_arguments, _gen_server_options] = start_link_arguments) do
+    default = %{
+      id: __MODULE__,
+      start: {__MODULE__, :start_link, start_link_arguments},
+      type: :supervisor
+    }
+
+    Supervisor.child_spec(default, [])
+  end
+
+  def start_link(arguments, gen_server_options \\ []) do
+    Supervisor.start_link(__MODULE__, arguments, gen_server_options)
+  end
+
+  @impl Supervisor
+  def init(fetcher_arguments) do
+    Supervisor.init(
+      [
+        {Task.Supervisor, name: Indexer.Block.Uncle.TaskSupervisor},
+        {Fetcher, [fetcher_arguments, [name: Fetcher]]}
+      ],
+      strategy: :rest_for_one
+    )
+  end
+end
diff --git a/apps/indexer/lib/indexer/pending_transaction/fetcher.ex b/apps/indexer/lib/indexer/pending_transaction/fetcher.ex
index 7d27c1606a..bfb9f46d3c 100644
--- a/apps/indexer/lib/indexer/pending_transaction/fetcher.ex
+++ b/apps/indexer/lib/indexer/pending_transaction/fetcher.ex
@@ -110,6 +110,7 @@ defmodule Indexer.PendingTransaction.Fetcher do
         {:ok, _} =
           Chain.import(%{
             addresses: %{params: addresses_params},
+            broadcast: true,
             transactions: %{params: transactions_params, on_conflict: :nothing}
           })
 
diff --git a/apps/indexer/test/indexer/address/coin_balances_test.exs b/apps/indexer/test/indexer/address/coin_balances_test.exs
index 15047621ed..ef49d4033b 100644
--- a/apps/indexer/test/indexer/address/coin_balances_test.exs
+++ b/apps/indexer/test/indexer/address/coin_balances_test.exs
@@ -11,12 +11,22 @@ defmodule Indexer.Address.CoinBalancesTest do
         |> to_string()
 
       block_number = 1
+
       params_set = CoinBalances.params_set(%{blocks_params: [%{miner_hash: miner_hash, number: block_number}]})
 
       assert MapSet.size(params_set) == 1
       assert %{address_hash: miner_hash, block_number: block_number}
     end
 
+    test "with block second degree relations extracts nothing" do
+      params_set =
+        CoinBalances.params_set(%{
+          block_second_degree_relations_params: [%{nephew_hash: Factory.block_hash(), uncle_hash: Factory.block_hash()}]
+        })
+
+      assert MapSet.size(params_set) == 0
+    end
+
     test "with call internal transaction extracts nothing" do
       internal_transaction_params =
         :internal_transaction
diff --git a/apps/indexer/test/indexer/block/catchup/bound_interval_supervisor_test.exs b/apps/indexer/test/indexer/block/catchup/bound_interval_supervisor_test.exs
index d79172a764..02190c8138 100644
--- a/apps/indexer/test/indexer/block/catchup/bound_interval_supervisor_test.exs
+++ b/apps/indexer/test/indexer/block/catchup/bound_interval_supervisor_test.exs
@@ -8,7 +8,7 @@ defmodule Indexer.Block.Catchup.BoundIntervalSupervisorTest do
 
   alias Explorer.Chain.Block
   alias Indexer.{BoundInterval, CoinBalance, InternalTransaction, Token, TokenBalance}
-  alias Indexer.Block.Catchup
+  alias Indexer.Block.{Catchup, Uncle}
 
   @moduletag capture_log: true
 
@@ -202,6 +202,10 @@ defmodule Indexer.Block.Catchup.BoundIntervalSupervisorTest do
       Token.Supervisor.Case.start_supervised!(json_rpc_named_arguments: json_rpc_named_arguments)
       TokenBalance.Supervisor.Case.start_supervised!(json_rpc_named_arguments: json_rpc_named_arguments)
 
+      Uncle.Supervisor.Case.start_supervised!(
+        block_fetcher: %Indexer.Block.Fetcher{json_rpc_named_arguments: json_rpc_named_arguments}
+      )
+
       Catchup.Supervisor.Case.start_supervised!(%{
         block_fetcher: %Indexer.Block.Fetcher{json_rpc_named_arguments: json_rpc_named_arguments}
       })
@@ -301,7 +305,8 @@ defmodule Indexer.Block.Catchup.BoundIntervalSupervisorTest do
                "size" => "0x0",
                "timestamp" => "0x0",
                "totalDifficulty" => "0x0",
-               "transactions" => []
+               "transactions" => [],
+               "uncles" => []
              }
            }
          ]}
@@ -323,6 +328,10 @@ defmodule Indexer.Block.Catchup.BoundIntervalSupervisorTest do
       Token.Supervisor.Case.start_supervised!(json_rpc_named_arguments: json_rpc_named_arguments)
       TokenBalance.Supervisor.Case.start_supervised!(json_rpc_named_arguments: json_rpc_named_arguments)
 
+      Uncle.Supervisor.Case.start_supervised!(
+        block_fetcher: %Indexer.Block.Fetcher{json_rpc_named_arguments: json_rpc_named_arguments}
+      )
+
       # from `setup :state`
       assert_received :catchup_index
 
diff --git a/apps/indexer/test/indexer/block/catchup/fetcher_test.exs b/apps/indexer/test/indexer/block/catchup/fetcher_test.exs
new file mode 100644
index 0000000000..bdcec64fa8
--- /dev/null
+++ b/apps/indexer/test/indexer/block/catchup/fetcher_test.exs
@@ -0,0 +1,115 @@
+defmodule Indexer.Block.Catchup.FetcherTest do
+  use EthereumJSONRPC.Case, async: false
+  use Explorer.DataCase
+
+  import Mox
+
+  alias Indexer.{Block, CoinBalance, InternalTransaction, Token, TokenBalance}
+  alias Indexer.Block.Catchup.Fetcher
+
+  @moduletag capture_log: true
+
+  # MUST use global mode because we aren't guaranteed to get `start_supervised`'s pid back fast enough to `allow` it to
+  # use expectations and stubs from test's pid.
+  setup :set_mox_global
+
+  setup :verify_on_exit!
+
+  setup do
+    # Uncle don't occur on POA chains, so there's no way to test this using the public addresses, so mox-only testing
+    %{
+      json_rpc_named_arguments: [
+        transport: EthereumJSONRPC.Mox,
+        transport_options: [],
+        # Which one does not matter, so pick one
+        variant: EthereumJSONRPC.Parity
+      ]
+    }
+  end
+
+  describe "import/1" do
+    test "fetches uncles asynchronously", %{json_rpc_named_arguments: json_rpc_named_arguments} do
+      CoinBalance.Supervisor.Case.start_supervised!(json_rpc_named_arguments: json_rpc_named_arguments)
+      InternalTransaction.Supervisor.Case.start_supervised!(json_rpc_named_arguments: json_rpc_named_arguments)
+      Token.Supervisor.Case.start_supervised!(json_rpc_named_arguments: json_rpc_named_arguments)
+      TokenBalance.Supervisor.Case.start_supervised!(json_rpc_named_arguments: json_rpc_named_arguments)
+
+      parent = self()
+
+      pid =
+        spawn_link(fn ->
+          receive do
+            {:"$gen_call", from, {:buffer, uncles}} ->
+              GenServer.reply(from, :ok)
+              send(parent, {:uncles, uncles})
+          end
+        end)
+
+      Process.register(pid, Block.Uncle.Fetcher)
+
+      nephew_hash = block_hash() |> to_string()
+      uncle_hash = block_hash() |> to_string()
+      miner_hash = address_hash() |> to_string()
+      block_number = 0
+
+      assert {:ok, _} =
+               Fetcher.import(%Block.Fetcher{json_rpc_named_arguments: json_rpc_named_arguments}, %{
+                 addresses: %{
+                   params: [
+                     %{hash: miner_hash}
+                   ]
+                 },
+                 address_hash_to_fetched_balance_block_number: %{miner_hash => block_number},
+                 balances: %{
+                   params: [
+                     %{
+                       address_hash: miner_hash,
+                       block_number: block_number
+                     }
+                   ]
+                 },
+                 blocks: %{
+                   params: [
+                     %{
+                       difficulty: 0,
+                       gas_limit: 21000,
+                       gas_used: 21000,
+                       miner_hash: miner_hash,
+                       nonce: 0,
+                       number: block_number,
+                       parent_hash:
+                         block_hash()
+                         |> to_string(),
+                       size: 0,
+                       timestamp: DateTime.utc_now(),
+                       total_difficulty: 0,
+                       hash: nephew_hash
+                     }
+                   ]
+                 },
+                 block_second_degree_relations: %{
+                   params: [
+                     %{
+                       nephew_hash: nephew_hash,
+                       uncle_hash: uncle_hash
+                     }
+                   ]
+                 },
+                 tokens: %{
+                   params: [],
+                   on_conflict: :nothing
+                 },
+                 token_balances: %{
+                   params: []
+                 },
+                 transactions: %{
+                   params: [],
+                   on_conflict: :nothing
+                 },
+                 transaction_hash_to_block_number: %{}
+               })
+
+      assert_receive {:uncles, [^uncle_hash]}
+    end
+  end
+end
diff --git a/apps/indexer/test/indexer/block/fetcher_test.exs b/apps/indexer/test/indexer/block/fetcher_test.exs
index 196cd6137a..1c5475c1ca 100644
--- a/apps/indexer/test/indexer/block/fetcher_test.exs
+++ b/apps/indexer/test/indexer/block/fetcher_test.exs
@@ -10,7 +10,7 @@ defmodule Indexer.Block.FetcherTest do
   alias Explorer.Chain
   alias Explorer.Chain.{Address, Log, Transaction, Wei}
   alias Indexer.{CoinBalance, BufferedTask, InternalTransaction, Token, TokenBalance}
-  alias Indexer.Block.Fetcher
+  alias Indexer.Block.{Fetcher, Uncle}
 
   @moduletag capture_log: true
 
@@ -45,6 +45,10 @@ defmodule Indexer.Block.FetcherTest do
       Token.Supervisor.Case.start_supervised!(json_rpc_named_arguments: json_rpc_named_arguments)
       TokenBalance.Supervisor.Case.start_supervised!(json_rpc_named_arguments: json_rpc_named_arguments)
 
+      Uncle.Supervisor.Case.start_supervised!(
+        block_fetcher: %Fetcher{json_rpc_named_arguments: json_rpc_named_arguments}
+      )
+
       %{
         block_fetcher: %Fetcher{
           broadcast: false,
diff --git a/apps/indexer/test/indexer/block/realtime_test.exs b/apps/indexer/test/indexer/block/realtime/fetcher_test.exs
similarity index 98%
rename from apps/indexer/test/indexer/block/realtime_test.exs
rename to apps/indexer/test/indexer/block/realtime/fetcher_test.exs
index 9b42fc4533..68dbdfb741 100644
--- a/apps/indexer/test/indexer/block/realtime_test.exs
+++ b/apps/indexer/test/indexer/block/realtime/fetcher_test.exs
@@ -1,4 +1,4 @@
-defmodule Indexer.BlockFetcher.RealtimeTest do
+defmodule Indexer.Block.Realtime.FetcherTest do
   use EthereumJSONRPC.Case, async: false
   use Explorer.DataCase
 
@@ -7,7 +7,7 @@ defmodule Indexer.BlockFetcher.RealtimeTest do
   alias Explorer.Chain
   alias Explorer.Chain.Address
   alias Indexer.{Sequence, Token}
-  alias Indexer.Block.Realtime
+  alias Indexer.Block.{Realtime, Uncle}
 
   @moduletag capture_log: true
 
@@ -36,7 +36,7 @@ defmodule Indexer.BlockFetcher.RealtimeTest do
     %{block_fetcher: block_fetcher, json_rpc_named_arguments: core_json_rpc_named_arguments}
   end
 
-  describe "Indexer.BlockFetcher.stream_import/1" do
+  describe "Indexer.Block.Fetcher.fetch_and_import_range/1" do
     @tag :no_geth
     test "in range with internal transactions", %{
       block_fetcher: %Indexer.Block.Fetcher{} = block_fetcher,
@@ -47,6 +47,10 @@ defmodule Indexer.BlockFetcher.RealtimeTest do
 
       Token.Supervisor.Case.start_supervised!(json_rpc_named_arguments: json_rpc_named_arguments)
 
+      Uncle.Supervisor.Case.start_supervised!(
+        block_fetcher: %Indexer.Block.Fetcher{json_rpc_named_arguments: json_rpc_named_arguments}
+      )
+
       if json_rpc_named_arguments[:transport] == EthereumJSONRPC.Mox do
         EthereumJSONRPC.Mox
         |> expect(:json_rpc, fn [
@@ -122,7 +126,7 @@ defmodule Indexer.BlockFetcher.RealtimeTest do
                    }
                  ],
                  "transactionsRoot" => "0xd7c39a93eafe0bdcbd1324c13dcd674bed8c9fa8adbf8f95bf6a59788985da6f",
-                 "uncles" => []
+                 "uncles" => ["0xa4ec735cabe1510b5ae081b30f17222580b4588dbec52830529753a688b046cd"]
                }
              },
              %{
diff --git a/apps/indexer/test/indexer/block/uncle/fetcher_test.exs b/apps/indexer/test/indexer/block/uncle/fetcher_test.exs
new file mode 100644
index 0000000000..970f1700a0
--- /dev/null
+++ b/apps/indexer/test/indexer/block/uncle/fetcher_test.exs
@@ -0,0 +1,126 @@
+defmodule Indexer.Block.Uncle.FetcherTest do
+  # MUST be `async: false` so that {:shared, pid} is set for connection to allow CoinBalanceFetcher's self-send to have
+  # connection allowed immediately.
+  use EthereumJSONRPC.Case, async: false
+  use Explorer.DataCase
+
+  alias Explorer.Chain
+  alias Indexer.Block
+
+  import Mox
+
+  @moduletag :capture_log
+
+  # MUST use global mode because we aren't guaranteed to get `start_supervised`'s pid back fast enough to `allow` it to
+  # use expectations and stubs from test's pid.
+  setup :set_mox_global
+
+  setup :verify_on_exit!
+
+  setup do
+    # Uncle don't occur on POA chains, so there's no way to test this using the public addresses, so mox-only testing
+    %{
+      json_rpc_named_arguments: [
+        transport: EthereumJSONRPC.Mox,
+        transport_options: [],
+        # Which one does not matter, so pick one
+        variant: EthereumJSONRPC.Parity
+      ]
+    }
+  end
+
+  describe "child_spec/1" do
+    test "raises ArgumentError is `json_rpc_named_arguments is not provided" do
+      assert_raise ArgumentError,
+                   ":json_rpc_named_arguments must be provided to `Elixir.Indexer.Block.Uncle.Fetcher.child_spec " <>
+                     "to allow for json_rpc calls when running.",
+                   fn ->
+                     start_supervised({Block.Uncle.Fetcher, [[], []]})
+                   end
+    end
+  end
+
+  describe "init/1" do
+    test "fetched unfetched uncle hashes", %{json_rpc_named_arguments: json_rpc_named_arguments} do
+      assert %Chain.Block.SecondDegreeRelation{nephew_hash: nephew_hash, uncle_hash: uncle_hash, uncle: nil} =
+               :block_second_degree_relation
+               |> insert()
+               |> Repo.preload([:nephew, :uncle])
+
+      uncle_hash_data = to_string(uncle_hash)
+      uncle_uncle_hash_data = to_string(block_hash())
+
+      EthereumJSONRPC.Mox
+      |> expect(:json_rpc, fn [%{method: "eth_getBlockByHash", params: [^uncle_hash_data, true]}], _ ->
+        number_quantity = "0x0"
+
+        {:ok,
+         [
+           %{
+             result: %{
+               "author" => "0xe2ac1c6843a33f81ae4935e5ef1277a392990381",
+               "difficulty" => "0xfffffffffffffffffffffffffffffffe",
+               "extraData" => "0xd583010a068650617269747986312e32362e32826c69",
+               "gasLimit" => "0x7a1200",
+               "gasUsed" => "0x0",
+               "hash" => uncle_hash_data,
+               "logsBloom" => "0x",
+               "miner" => "0xe2ac1c6843a33f81ae4935e5ef1277a392990381",
+               "number" => number_quantity,
+               "parentHash" => "0x006edcaa1e6fde822908783bc4ef1ad3675532d542fce53537557391cfe34c3c",
+               "size" => "0x243",
+               "timestamp" => "0x5b437f41",
+               "totalDifficulty" => "0x342337ffffffffffffffffffffffffed8d29bb",
+               "transactions" => [
+                 %{
+                   "blockHash" => uncle_hash_data,
+                   "blockNumber" => number_quantity,
+                   "chainId" => "0x4d",
+                   "condition" => nil,
+                   "creates" => "0xffc87239eb0267bc3ca2cd51d12fbf278e02ccb4",
+                   "from" => "0xe8ddc5c7a2d2f0d7a9798459c0104fdf5e987aca",
+                   "gas" => "0x47b760",
+                   "gasPrice" => "0x174876e800",
+                   "hash" => "0x3a3eb134e6792ce9403ea4188e5e79693de9e4c94e499db132be086400da79e6",
+                   "input" => "0x",
+                   "nonce" => "0x0",
+                   "r" => "0xad3733df250c87556335ffe46c23e34dbaffde93097ef92f52c88632a40f0c75",
+                   "s" => "0x72caddc0371451a58de2ca6ab64e0f586ccdb9465ff54e1c82564940e89291e3",
+                   "standardV" => "0x0",
+                   "to" => nil,
+                   "transactionIndex" => "0x0",
+                   "v" => "0xbd",
+                   "value" => "0x0"
+                 }
+               ],
+               "uncles" => [uncle_uncle_hash_data]
+             }
+           }
+         ]}
+      end)
+
+      Block.Uncle.Supervisor.Case.start_supervised!(
+        block_fetcher: %Block.Fetcher{json_rpc_named_arguments: json_rpc_named_arguments}
+      )
+
+      wait(fn ->
+        Repo.one!(
+          from(bsdr in Chain.Block.SecondDegreeRelation,
+            where: bsdr.nephew_hash == ^nephew_hash and not is_nil(bsdr.uncle_fetched_at)
+          )
+        )
+      end)
+
+      refute is_nil(Repo.get(Chain.Block, uncle_hash))
+      assert Repo.aggregate(Chain.Transaction.Fork, :count, :hash) == 1
+    end
+  end
+
+  defp wait(producer) do
+    producer.()
+  rescue
+    Ecto.NoResultsError ->
+      Process.sleep(100)
+      wait(producer)
+  end
+end
diff --git a/apps/indexer/test/support/indexer/block/uncle/supervisor/case.ex b/apps/indexer/test/support/indexer/block/uncle/supervisor/case.ex
new file mode 100644
index 0000000000..331ddfebd0
--- /dev/null
+++ b/apps/indexer/test/support/indexer/block/uncle/supervisor/case.ex
@@ -0,0 +1,18 @@
+defmodule Indexer.Block.Uncle.Supervisor.Case do
+  alias Indexer.Block
+
+  def start_supervised!(fetcher_arguments \\ []) when is_list(fetcher_arguments) do
+    merged_fetcher_arguments =
+      Keyword.merge(
+        fetcher_arguments,
+        flush_interval: 50,
+        init_chunk_size: 1,
+        max_batch_size: 1,
+        max_concurrency: 1
+      )
+
+    [merged_fetcher_arguments]
+    |> Block.Uncle.Supervisor.child_spec()
+    |> ExUnit.Callbacks.start_supervised!()
+  end
+end