ERC-1155 transfers support in UI

.dialyzer-ignore

@@ -28,3 +28,4 @@ lib/explorer/staking/stake_snapshotting.ex:15: Function do_snapshotting/7 has no
 lib/explorer/staking/stake_snapshotting.ex:147
 lib/explorer/third_party_integrations/sourcify.ex:65
 lib/explorer/third_party_integrations/sourcify.ex:68
+lib/block_scout_web/views/transaction_view.ex:141

apps/block_scout_web/lib/block_scout_web/templates/address_token_balance/_token_balances.html.eex

@@ -45,6 +45,15 @@
           ) %>
     <% end %>
 
+    <%= if Enum.any?(@token_balances, & &1.token.type == "ERC-1155") do %>
+      <%= render(
+            "_tokens.html",
+            conn: @conn,
+            token_balances: filter_by_type(@token_balances, "ERC-1155"),
+            type: "ERC-1155"
+          ) %>
+    <% end %>
+
     <%= if Enum.any?(@token_balances, & &1.token.type == "ERC-20") do %>
       <%= render(
             "_tokens.html",

apps/block_scout_web/lib/block_scout_web/templates/address_token_balance/_tokens.html.eex

@@ -23,8 +23,12 @@
           <% end %>
         </div>
         <div class="row">
-          <p class="mb-0 col-md-6">
+          <% col_md = if token_balance.token.usd_value, do: "col-md-6", else: "col-md-12" %>
+          <p class="mb-0 <%= col_md%> ">
             <%= format_according_to_decimals(token_balance.value, token_balance.token.decimals) %> <%= token_balance.token.symbol %>
+            <%= if token_balance.token_type == "ERC-1155" do %>
+              <%= " TokenID " <> to_string(token_balance.token_id) %>
+            <% end %>
           </p>
           <%= if token_balance.token.usd_value do %>
             <p class="mb-0 col-md-6 text-right text-muted">

apps/block_scout_web/lib/block_scout_web/templates/common_components/_token_transfer_type_display_name.html.eex

@@ -0,0 +1,12 @@
+<%= case @type do %>
+    <% :token_burning -> %>
+    <%= gettext("Token Burning") %>
+    <% :token_minting -> %>
+    <%= gettext("Token Minting") %>
+    <% :token_spawning -> %>
+    <%= gettext("Token Creation") %>
+    <% :token_transfer -> %>
+    <%= gettext("Token Transfer") %>
+    <% _ -> %>
+    <%= gettext("Token Transfer") %>
+<% end %>

apps/block_scout_web/lib/block_scout_web/templates/tokens/holder/_token_balances.html.eex

@@ -7,7 +7,7 @@
 
       <span>
         <span class="text-dark">
-          <%= format_token_balance_value(@token_balance.value, @token) %> <%= @token.symbol %>
+          <%= format_token_balance_value(@token_balance.value, @token_balance.token_id, @token) %> <%= @token.symbol %>
         </span>
 
         <%= if show_total_supply_percentage?(@token.total_supply) do %>

apps/block_scout_web/lib/block_scout_web/templates/tokens/transfer/_token_transfer.html.eex

@@ -3,14 +3,7 @@
     <!-- Color Block -->
     <div class="tile-transaction-type-block col-md-2 d-flex flex-row flex-md-column">
       <span class="tile-label">
-        <%= cond do %>
-          <% @token_transfer.to_address.hash == @burn_address_hash -> %>
-            <%= gettext("Token Burning") %>
-          <% @token_transfer.from_address.hash == @burn_address_hash -> %>
-            <%= gettext("Token Minting") %>
-          <% true -> %>
-            <%= gettext("Token Transfer") %>
-        <% end %>
+        <%= render(BlockScoutWeb.CommonComponentsView, "_token_transfer_type_display_name.html", type: Chain.get_token_transfer_type(@token_transfer)) %>
       </span>
     </div>
     <!-- Content -->

apps/block_scout_web/lib/block_scout_web/templates/transaction/_total_transfers.html.eex

@@ -1,6 +1,13 @@
 <%= case token_transfer_amount(@transfer) do %>
     <% {:ok, :erc721_instance} -> %>
         <%= "TokenID ["%><%= link(short_token_id(@transfer.token_id, 30), to: token_instance_path(BlockScoutWeb.Endpoint, :show, @transfer.token.contract_address_hash, to_string(@transfer.token_id)), "data-test": "token_link") %><%= "]" %>
+    <% {:ok, :erc1155_instance, value} -> %>
+        <% transfer_type = Chain.get_token_transfer_type(@transfer) %>
+        <%= if transfer_type == :token_spawning do %>
+            <%= "TokenID ["%><%= link(short_token_id(@transfer.token_id, 30), to: token_instance_path(BlockScoutWeb.Endpoint, :show, @transfer.token.contract_address_hash, to_string(@transfer.token_id)), "data-test": "token_link") %><%= "]" %>
+        <% else %>
+            <%= "#{value} TokenID ["%><%= link(short_token_id(@transfer.token_id, 30), to: token_instance_path(BlockScoutWeb.Endpoint, :show, @transfer.token.contract_address_hash, to_string(@transfer.token_id)), "data-test": "token_link") %><%= "]" %>
+        <% end %>
     <% {:ok, value} -> %>
         <%= value %>
 <% end %>

apps/block_scout_web/lib/block_scout_web/templates/transaction/overview.html.eex

@@ -225,18 +225,17 @@
                 <% end %>
               </div>
             <% end %>
-            <% token_transfers = aggregate_token_transfers(transaction_with_transfers.token_transfers) %>
-            <%= if Enum.count(token_transfers) > 0 do %>
+            <% %{transfers: transfers, mintings: mintings, burnings: burnings, creations: creations} = aggregate_token_transfers(transaction_with_transfers.token_transfers) %>
+            <%= if Enum.count(transfers) > 0 do %>
               <h2 class="card-title balance-card-title"><%= token_type_name(type)%><%= gettext " Token Transfer" %></h2>
               <div class="text-right">
-              <%= for transfer  <- token_transfers do %>
+              <%= for transfer  <- transfers do %>
                 <h3 class="address-balance-text">
                   <%= render BlockScoutWeb.TransactionView, "_total_transfers.html", Map.put(assigns, :transfer, transfer) %>
                 </h3>
               <% end %>
               </div>
             <% end %>
-            <% mintings = aggregate_token_mintings(transaction_with_transfers.token_transfers) %>
             <%= if Enum.count(mintings) > 0 do %>
               <h2 class="card-title balance-card-title"><%= token_type_name(type)%><%= gettext " Token Minting" %></h2>
               <div class="text-right">
@@ -247,7 +246,6 @@
               <% end %>
               </div>
             <% end %>
-            <% burnings = aggregate_token_burnings(transaction_with_transfers.token_transfers) %>
             <%= if Enum.count(burnings) > 0 do %>
               <h2 class="card-title balance-card-title"><%= token_type_name(type)%><%= gettext " Token Burning" %></h2>
               <div class="text-right">
@@ -258,6 +256,19 @@
               <% end %>
               </div>
             <% end %>
+            <%# ERC-1155 token creations %>
+            <%= if Enum.count(creations) > 0 do %>
+              <h2 class="card-title balance-card-title"><%= token_type_name(type)%><%= gettext " Token Creation" %></h2>
+              <div class="text-right">
+              <%= for transfer  <- creations do %>
+                <h3 class="address-balance-text">
+                  <%= "TokenID ["%><%= link(short_token_id(transfer.token_id, 30), to: token_instance_path(BlockScoutWeb.Endpoint, :show, transfer.token.contract_address_hash, to_string(transfer.token_id)), "data-test": "token_link") %><%= "]" %>
+                  <%= " "%>
+                  <%= link(token_symbol(transfer.token), to: token_path(BlockScoutWeb.Endpoint, :show, transfer.token.contract_address_hash), "data-test": "token_link") %>
+                </h3>
+              <% end %>
+              </div>
+            <% end %>
           </div>
         </div>
       <% _ -> %>

apps/block_scout_web/lib/block_scout_web/templates/transaction_token_transfer/_token_transfer.html.eex

@@ -1,14 +1,7 @@
 <div class="tile tile-type-token-transfer fade-in">
   <div class="row justify-content-end">
     <div class="col-12 col-md-4 col-lg-2 d-flex align-items-center justify-content-start justify-content-lg-center tile-label">
-      <%= cond do %>
-        <% @token_transfer.to_address.hash == @burn_address_hash -> %>
-          <%= gettext("Token Burning") %>
-        <% @token_transfer.from_address.hash == @burn_address_hash -> %>
-          <%= gettext("Token Minting") %>
-        <% true -> %>
-          <%= gettext("Token Transfer") %>
-      <% end %>
+      <%= render(BlockScoutWeb.CommonComponentsView, "_token_transfer_type_display_name.html", type: Chain.get_token_transfer_type(@token_transfer)) %>
     </div>
 
     <div class="col-12 col-md-8 col-lg-10 d-flex flex-column text-nowrap">

apps/block_scout_web/lib/block_scout_web/views/api/rpc/address_view.ex

@@ -172,6 +172,12 @@ defmodule BlockScoutWeb.API.RPC.AddressView do
     |> Map.put_new(:tokenID, token_transfer.token_id)
   end
 
+  defp prepare_token_transfer(%{token_type: "ERC-1155"} = token_transfer) do
+    token_transfer
+    |> prepare_common_token_transfer()
+    |> Map.put_new(:tokenID, token_transfer.token_id)
+  end
+
   defp prepare_token_transfer(%{token_type: "ERC-20"} = token_transfer) do
     token_transfer
     |> prepare_common_token_transfer()

apps/block_scout_web/lib/block_scout_web/views/tokens/helpers.ex

@@ -32,14 +32,14 @@ defmodule BlockScoutWeb.Tokens.Helpers do
     {:ok, CurrencyHelpers.format_according_to_decimals(amount, decimals)}
   end
 
-  defp do_token_transfer_amount(%Token{type: "ERC-1155", decimals: decimals}, amount, _token_id) do
-    {:ok, CurrencyHelpers.format_according_to_decimals(amount, decimals)}
-  end
-
   defp do_token_transfer_amount(%Token{type: "ERC-721"}, _amount, _token_id) do
     {:ok, :erc721_instance}
   end
 
+  defp do_token_transfer_amount(%Token{type: "ERC-1155", decimals: decimals}, amount, _token_id) do
+    {:ok, :erc1155_instance, CurrencyHelpers.format_according_to_decimals(amount, decimals)}
+  end
+
   defp do_token_transfer_amount(_token, _amount, _token_id) do
     nil
   end

apps/block_scout_web/lib/block_scout_web/views/tokens/holder_view.ex

@@ -50,19 +50,23 @@ defmodule BlockScoutWeb.Tokens.HolderView do
   ## Examples
 
     iex> token = build(:token, type: "ERC-20", decimals: Decimal.new(2))
-    iex> BlockScoutWeb.Tokens.HolderView.format_token_balance_value(100000, token)
+    iex> BlockScoutWeb.Tokens.HolderView.format_token_balance_value(100000, nil, token)
     "1,000"
 
     iex> token = build(:token, type: "ERC-721")
-    iex> BlockScoutWeb.Tokens.HolderView.format_token_balance_value(1, token)
+    iex> BlockScoutWeb.Tokens.HolderView.format_token_balance_value(1, nil, token)
     1
 
   """
-  def format_token_balance_value(value, %Token{type: "ERC-20", decimals: decimals}) do
+  def format_token_balance_value(value, _id, %Token{type: "ERC-20", decimals: decimals}) do
     format_according_to_decimals(value, decimals)
   end
 
-  def format_token_balance_value(value, _token) do
+  def format_token_balance_value(value, id, %Token{type: "ERC-1155", decimals: decimals}) do
+    to_string(format_according_to_decimals(value, decimals)) <> " TokenID " <> to_string(id)
+  end
+
+  def format_token_balance_value(value, _id, _token) do
     value
   end
 end

apps/block_scout_web/lib/block_scout_web/views/tokens/overview_view.ex

@@ -44,6 +44,7 @@ defmodule BlockScoutWeb.Tokens.OverviewView do
   defp tab_name(["inventory"]), do: gettext("Inventory")
 
   def display_inventory?(%Token{type: "ERC-721"}), do: true
+  def display_inventory?(%Token{type: "ERC-1155"}), do: true
   def display_inventory?(_), do: false
 
   def smart_contract_with_read_only_functions?(

apps/block_scout_web/lib/block_scout_web/views/tokens/transfer_view.ex

@@ -2,5 +2,6 @@ defmodule BlockScoutWeb.Tokens.TransferView do
   use BlockScoutWeb, :view
 
   alias BlockScoutWeb.Tokens.OverviewView
+  alias Explorer.Chain
   alias Explorer.Chain.Address
 end

apps/block_scout_web/lib/block_scout_web/views/transaction_token_transfer_view.ex

@@ -1,3 +1,5 @@
 defmodule BlockScoutWeb.TransactionTokenTransferView do
   use BlockScoutWeb, :view
+
+  alias Explorer.Chain
 end

apps/block_scout_web/lib/block_scout_web/views/transaction_view.ex

@@ -16,16 +16,15 @@ defmodule BlockScoutWeb.TransactionView do
 
   @tabs ["token-transfers", "internal-transactions", "logs", "raw-trace"]
 
-  {:ok, burn_address_hash} = Chain.string_to_address_hash("0x0000000000000000000000000000000000000000")
-  @burn_address_hash burn_address_hash
-
   @token_burning_title "Token Burning"
   @token_minting_title "Token Minting"
   @token_transfer_title "Token Transfer"
+  @token_creation_title "Token Creation"
 
-  @token_burning_type "token-burning"
-  @token_minting_type "token-minting"
-  @token_transfer_type "token-transfer"
+  @token_burning_type :token_burning
+  @token_minting_type :token_minting
+  @token_creation_type :token_spawning
+  @token_transfer_type :token_transfer
 
   defguardp is_transaction_type(mod) when mod in [InternalTransaction, Transaction]
 
@@ -63,52 +62,80 @@ defmodule BlockScoutWeb.TransactionView do
   end
 
   def aggregate_token_transfers(token_transfers) do
-    {transfers, nft_transfers} =
+    %{
+      transfers: {ft_transfers, nft_transfers},
+      mintings: {ft_mintings, nft_mintings},
+      burnings: {ft_burnings, nft_burnings},
+      creations: {ft_creations, nft_creations}
+    } =
       token_transfers
-      |> Enum.reduce({%{}, []}, fn token_transfer, acc ->
-        if token_transfer.to_address_hash != @burn_address_hash &&
-             token_transfer.from_address_hash != @burn_address_hash do
-          aggregate_reducer(token_transfer, acc)
-        else
-          acc
-        end
-      end)
+      |> Enum.reduce(
+        %{
+          transfers: {%{}, []},
+          mintings: {%{}, []},
+          burnings: {%{}, []},
+          creations: {%{}, []}
+        },
+        fn token_transfer, acc ->
+          token_transfer_type = Chain.get_token_transfer_type(token_transfer)
 
-    final_transfers = Map.values(transfers)
+          case token_transfer_type do
+            :token_transfer ->
+              transfers = aggregate_reducer(token_transfer, acc.transfers)
+
+              %{
+                transfers: transfers,
+                mintings: acc.mintings,
+                burnings: acc.burnings,
+                creations: acc.creations
+              }
 
-    final_transfers ++ nft_transfers
-  end
+            :token_burning ->
+              burnings = aggregate_reducer(token_transfer, acc.burnings)
 
-  def aggregate_token_mintings(token_transfers) do
-    {transfers, nft_transfers} =
-      token_transfers
-      |> Enum.reduce({%{}, []}, fn token_transfer, acc ->
-        if token_transfer.from_address_hash == @burn_address_hash do
-          aggregate_reducer(token_transfer, acc)
-        else
-          acc
-        end
-      end)
+              %{
+                transfers: acc.transfers,
+                mintings: acc.mintings,
+                burnings: burnings,
+                creations: acc.creations
+              }
 
-    final_transfers = Map.values(transfers)
+            :token_minting ->
+              mintings = aggregate_reducer(token_transfer, acc.mintings)
 
-    final_transfers ++ nft_transfers
-  end
+              %{
+                transfers: acc.transfers,
+                mintings: mintings,
+                burnings: acc.burnings,
+                creations: acc.creations
+              }
 
-  def aggregate_token_burnings(token_transfers) do
-    {transfers, nft_transfers} =
-      token_transfers
-      |> Enum.reduce({%{}, []}, fn token_transfer, acc ->
-        if token_transfer.to_address_hash == @burn_address_hash do
-          aggregate_reducer(token_transfer, acc)
-        else
-          acc
+            :token_spawning ->
+              creations = aggregate_reducer(token_transfer, acc.creations)
+
+              %{
+                transfers: acc.transfers,
+                mintings: acc.mintings,
+                burnings: acc.burnings,
+                creations: creations
+              }
           end
-      end)
+        end
+      )
+
+    final_ft_transfers = Map.values(ft_transfers)
+    transfers = final_ft_transfers ++ nft_transfers
+
+    final_ft_mintings = Map.values(ft_mintings)
+    mintings = final_ft_mintings ++ nft_mintings
 
-    final_transfers = Map.values(transfers)
+    final_ft_burnings = Map.values(ft_burnings)
+    burnings = final_ft_burnings ++ nft_burnings
 
-    final_transfers ++ nft_transfers
+    final_ft_creations = Map.values(ft_creations)
+    creations = final_ft_creations ++ nft_creations
+
+    %{transfers: transfers, mintings: mintings, burnings: burnings, creations: creations}
   end
 
   defp aggregate_reducer(%{amount: amount} = token_transfer, {acc1, acc2}) when is_nil(amount) do
@@ -147,6 +174,7 @@ defmodule BlockScoutWeb.TransactionView do
     case type do
       :erc20 -> gettext("ERC-20 ")
       :erc721 -> gettext("ERC-721 ")
+      :erc1155 -> gettext("ERC-1155 ")
       _ -> ""
     end
   end
@@ -336,11 +364,12 @@ defmodule BlockScoutWeb.TransactionView do
   def transaction_display_type(%Transaction{} = transaction) do
     cond do
       involves_token_transfers?(transaction) ->
-        token_transfer_type = get_token_transfer_type(transaction.token_transfers)
+        token_transfer_type = get_transaction_type_from_token_transfers(transaction.token_transfers)
 
         case token_transfer_type do
           @token_minting_type -> gettext(@token_minting_title)
           @token_burning_type -> gettext(@token_burning_title)
+          @token_creation_type -> gettext(@token_creation_title)
           @token_transfer_type -> gettext(@token_transfer_title)
         end
 
@@ -407,35 +436,27 @@ defmodule BlockScoutWeb.TransactionView do
   defp tab_name(["logs"]), do: gettext("Logs")
   defp tab_name(["raw-trace"]), do: gettext("Raw Trace")
 
-  defp get_token_transfer_type(token_transfers) do
+  defp get_transaction_type_from_token_transfers(token_transfers) do
+    token_transfers_types =
       token_transfers
-    |> Enum.reduce("", fn token_transfer, type ->
-      cond do
-        token_transfer.to_address_hash == @burn_address_hash ->
-          update_transfer_type_if_burning(type)
+      |> Enum.map(fn token_transfer ->
+        Chain.get_token_transfer_type(token_transfer)
+      end)
 
-        token_transfer.from_address_hash == @burn_address_hash ->
-          update_transfer_type_if_minting(type)
+    burnings_count =
+      Enum.count(token_transfers_types, fn token_transfers_type -> token_transfers_type == @token_burning_type end)
 
-        true ->
-          @token_transfer_type
-      end
-    end)
-  end
+    mintings_count =
+      Enum.count(token_transfers_types, fn token_transfers_type -> token_transfers_type == @token_minting_type end)
 
-  defp update_transfer_type_if_minting(type) do
-    case type do
-      "" -> @token_minting_type
-      @token_burning_type -> @token_transfer_type
-      _ -> type
-    end
-  end
+    creations_count =
+      Enum.count(token_transfers_types, fn token_transfers_type -> token_transfers_type == @token_creation_type end)
 
-  defp update_transfer_type_if_burning(type) do
-    case type do
-      "" -> @token_burning_type
-      @token_minting_type -> @token_transfer_type
-      _ -> type
+    cond do
+      Enum.count(token_transfers_types) == burnings_count -> @token_burning_type
+      Enum.count(token_transfers_types) == mintings_count -> @token_minting_type
+      Enum.count(token_transfers_types) == creations_count -> @token_creation_type
+      true -> @token_transfer_type
     end
   end
 end

apps/block_scout_web/test/block_scout_web/views/tokens/holder_view_test.exs

@@ -42,19 +42,19 @@ defmodule BlockScoutWeb.Tokens.HolderViewTest do
     end
   end
 
-  describe "format_token_balance_value/1" do
+  describe "format_token_balance_value/3" do
     test "formats according to token decimals when it's a ERC-20" do
       token = build(:token, type: "ERC-20", decimals: Decimal.new(2))
       token_balance = build(:token_balance, value: 2_000_000)
 
-      assert HolderView.format_token_balance_value(token_balance.value, token) == "20,000"
+      assert HolderView.format_token_balance_value(token_balance.value, nil, token) == "20,000"
     end
 
     test "returns the value when it's ERC-721" do
       token = build(:token, type: "ERC-721")
       token_balance = build(:token_balance, value: 1)
 
-      assert HolderView.format_token_balance_value(token_balance.value, token) == 1
+      assert HolderView.format_token_balance_value(token_balance.value, nil, token) == 1
     end
   end
 end

apps/block_scout_web/test/block_scout_web/views/transaction_view_test.exs

@@ -264,8 +264,8 @@ defmodule BlockScoutWeb.TransactionViewTest do
 
       result = TransactionView.aggregate_token_transfers([token_transfer, token_transfer, token_transfer])
 
-      assert Enum.count(result) == 1
-      assert List.first(result).amount == Decimal.new(3)
+      assert Enum.count(result.transfers) == 1
+      assert List.first(result.transfers).amount == Decimal.new(3)
     end
 
     test "does not aggregate NFT tokens" do
@@ -278,8 +278,8 @@ defmodule BlockScoutWeb.TransactionViewTest do
 
       result = TransactionView.aggregate_token_transfers([token_transfer, token_transfer, token_transfer])
 
-      assert Enum.count(result) == 3
-      assert List.first(result).amount == nil
+      assert Enum.count(result.transfers) == 3
+      assert List.first(result.transfers).amount == nil
     end
   end
 end

apps/ethereum_jsonrpc/lib/ethereum_jsonrpc.ex

@@ -168,7 +168,11 @@ defmodule EthereumJSONRPC do
   """
   @spec execute_contract_functions([Contract.call()], [map()], json_rpc_named_arguments) :: [Contract.call_result()]
   def execute_contract_functions(functions, abi, json_rpc_named_arguments) do
+    if Enum.count(functions) > 0 do
       Contract.execute_contract_functions(functions, abi, json_rpc_named_arguments)
+    else
+      []
+    end
   end
 
   @doc """

apps/explorer/lib/explorer/chain.ex

@@ -98,6 +98,8 @@ defmodule Explorer.Chain do
   # keccak256("Error(string)")
   @revert_error_method_id "08c379a0"
 
+  @burn_address_hash_str "0x0000000000000000000000000000000000000000"
+
   @typedoc """
   The name of an association on the `t:Ecto.Schema.t/0`
   """
@@ -1635,7 +1637,7 @@ defmodule Explorer.Chain do
 
   @spec fetch_sum_coin_total_supply_minus_burnt() :: non_neg_integer
   def fetch_sum_coin_total_supply_minus_burnt do
-    {:ok, burn_address_hash} = string_to_address_hash("0x0000000000000000000000000000000000000000")
+    {:ok, burn_address_hash} = Chain.string_to_address_hash(@burn_address_hash_str)
 
     query =
       from(
@@ -5187,7 +5189,7 @@ defmodule Explorer.Chain do
   end
 
   @spec transaction_token_transfer_type(Transaction.t()) ::
-          :erc20 | :erc721 | :token_transfer | nil
+          :erc20 | :erc721 | :erc1155 | :token_transfer | nil
   def transaction_token_transfer_type(
         %Transaction{
           status: :ok,
@@ -5234,10 +5236,24 @@ defmodule Explorer.Chain do
 
         find_erc721_token_transfer(transaction.token_transfers, {from_address, to_address})
 
+      # safeTransferFrom(address,address,uint256,uint256,bytes)
+      {"0xf242432a" <> params, ^zero_wei} ->
+        types = [:address, :address, {:uint, 256}, {:uint, 256}, :bytes]
+        [from_address, to_address, _id, _value, _data] = decode_params(params, types)
+
+        find_erc1155_token_transfer(transaction.token_transfers, {from_address, to_address})
+
+      # safeBatchTransferFrom(address,address,uint256[],uint256[],bytes)
+      {"0x2eb2c2d6" <> params, ^zero_wei} ->
+        types = [:address, :address, [{:uint, 256}], [{:uint, 256}], :bytes]
+        [from_address, to_address, _ids, _values, _data] = decode_params(params, types)
+
+        find_erc1155_token_transfer(transaction.token_transfers, {from_address, to_address})
+
       {"0xf907fc5b" <> _params, ^zero_wei} ->
         :erc20
 
-      # check for ERC 20 or for old ERC 721 token versions
+      # check for ERC-20 or for old ERC-721, ERC-1155 token versions
       {unquote(TokenTransfer.transfer_function_signature()) <> params, ^zero_wei} ->
         types = [:address, {:uint, 256}]
 
@@ -5245,7 +5261,7 @@ defmodule Explorer.Chain do
 
         decimal_value = Decimal.new(value)
 
-        find_erc721_or_erc20_token_transfer(transaction.token_transfers, {address, decimal_value})
+        find_erc721_or_erc20_or_erc1155_token_transfer(transaction.token_transfers, {address, decimal_value})
 
       _ ->
         nil
@@ -5261,7 +5277,16 @@ defmodule Explorer.Chain do
     if token_transfer, do: :erc721
   end
 
-  defp find_erc721_or_erc20_token_transfer(token_transfers, {address, decimal_value}) do
+  defp find_erc1155_token_transfer(token_transfers, {from_address, to_address}) do
+    token_transfer =
+      Enum.find(token_transfers, fn token_transfer ->
+        token_transfer.from_address_hash.bytes == from_address && token_transfer.to_address_hash.bytes == to_address
+      end)
+
+    if token_transfer, do: :erc1155
+  end
+
+  defp find_erc721_or_erc20_or_erc1155_token_transfer(token_transfers, {address, decimal_value}) do
     token_transfer =
       Enum.find(token_transfers, fn token_transfer ->
         token_transfer.to_address_hash.bytes == address && token_transfer.amount == decimal_value
@@ -5271,6 +5296,7 @@ defmodule Explorer.Chain do
       case token_transfer.token do
         %Token{type: "ERC-20"} -> :erc20
         %Token{type: "ERC-721"} -> :erc721
+        %Token{type: "ERC-1155"} -> :erc1155
         _ -> nil
       end
     else
@@ -6317,4 +6343,24 @@ defmodule Explorer.Chain do
       _ -> ""
     end
   end
+
+  @spec get_token_transfer_type(TokenTransfer.t()) ::
+          :token_burning | :token_minting | :token_spawning | :token_transfer
+  def get_token_transfer_type(transfer) do
+    {:ok, burn_address_hash} = Chain.string_to_address_hash(@burn_address_hash_str)
+
+    cond do
+      transfer.to_address_hash == burn_address_hash && transfer.from_address_hash !== burn_address_hash ->
+        :token_burning
+
+      transfer.to_address_hash !== burn_address_hash && transfer.from_address_hash == burn_address_hash ->
+        :token_minting
+
+      transfer.to_address_hash == burn_address_hash && transfer.from_address_hash == burn_address_hash ->
+        :token_spawning
+
+      true ->
+        :token_transfer
+    end
+  end
 end

apps/explorer/lib/explorer/chain/address/current_token_balance.ex

@@ -23,6 +23,8 @@ defmodule Explorer.Chain.Address.CurrentTokenBalance do
    *  `token_contract_address_hash` - The contract address hash foreign key.
    *  `block_number` - The block's number that the transfer took place.
    *  `value` - The value that's represents the balance.
+   *  `token_id` - The token_id of the transferred token (applicable for ERC-1155 and ERC-721 tokens)
+   *  `token_type` - The type of the token
   """
   @type t :: %__MODULE__{
           address: %Ecto.Association.NotLoaded{} | Address.t(),
@@ -39,6 +41,8 @@ defmodule Explorer.Chain.Address.CurrentTokenBalance do
     field(:value, :decimal)
     field(:block_number, :integer)
     field(:value_fetched_at, :utc_datetime_usec)
+    field(:token_id, :decimal)
+    field(:token_type, :string)
 
     # A transient field for deriving token holder count deltas during address_current_token_balances upserts
     field(:old_value, :decimal)
@@ -56,8 +60,8 @@ defmodule Explorer.Chain.Address.CurrentTokenBalance do
     timestamps()
   end
 
-  @optional_fields ~w(value value_fetched_at)a
-  @required_fields ~w(address_hash block_number token_contract_address_hash)a
+  @optional_fields ~w(value value_fetched_at token_id)a
+  @required_fields ~w(address_hash block_number token_contract_address_hash token_type)a
   @allowed_fields @optional_fields ++ @required_fields
 
   @doc false

apps/explorer/lib/explorer/chain/token.ex

@@ -8,6 +8,7 @@ defmodule Explorer.Chain.Token do
 
   * ERC-20
   * ERC-721
+  * ERC-1155
 
   ## Token Specifications
 

apps/explorer/lib/explorer/chain/token_transfer.ex

@@ -300,6 +300,7 @@ defmodule Explorer.Chain.TokenTransfer do
       left_join: instance in Instance,
       on: tt.token_contract_address_hash == instance.token_contract_address_hash and tt.token_id == instance.token_id,
       where: tt.token_contract_address_hash == ^contract_address_hash,
+      where: tt.to_address_hash != ^"0x0000000000000000000000000000000000000000",
       order_by: [desc: tt.block_number],
       distinct: [desc: tt.token_id],
       preload: [:to_address],

apps/explorer/lib/explorer/token/balance_reader.ex

@@ -45,6 +45,13 @@ defmodule Explorer.Token.BalanceReader do
   def get_balances_of(token_balance_requests) do
     regular_balances =
       token_balance_requests
+      |> Enum.filter(fn request ->
+        if Map.has_key?(request, :token_type) do
+          request.token_type !== "ERC-1155"
+        else
+          true
+        end
+      end)
       |> Enum.map(&format_balance_request/1)
       |> Reader.query_contracts(@balance_function_abi)
       |> Enum.map(&format_balance_result/1)
@@ -52,21 +59,13 @@ defmodule Explorer.Token.BalanceReader do
     erc1155_balances =
       token_balance_requests
       |> Enum.filter(fn request ->
+        if Map.has_key?(request, :token_type) do
           request.token_type == "ERC-1155"
+        else
+          false
+        end
       end)
-      |> Enum.map(fn %{
-                       address_hash: address_hash,
-                       block_number: block_number,
-                       token_contract_address_hash: token_contract_address_hash,
-                       token_id: token_id
-                     } ->
-        %{
-          contract_address: token_contract_address_hash,
-          function_name: "balanceOf",
-          args: [address_hash, token_id],
-          block_number: block_number
-        }
-      end)
+      |> Enum.map(&format_erc_1155_balance_request/1)
       |> Reader.query_contracts(@erc1155_balance_function_abi)
       |> Enum.map(&format_balance_result/1)
 
@@ -86,6 +85,20 @@ defmodule Explorer.Token.BalanceReader do
     }
   end
 
+  defp format_erc_1155_balance_request(%{
+         address_hash: address_hash,
+         block_number: block_number,
+         token_contract_address_hash: token_contract_address_hash,
+         token_id: token_id
+       }) do
+    %{
+      contract_address: token_contract_address_hash,
+      method_id: "00fdd58e",
+      args: [address_hash, token_id],
+      block_number: block_number
+    }
+  end
+
   defp format_balance_result({:ok, [balance]}) do
     {:ok, balance}
   end

apps/explorer/priv/repo/migrations/20210422115740_add_token_id_to_current_token_balances.exs

@@ -0,0 +1,12 @@
+defmodule Explorer.Repo.Migrations.AddTokenIdToCurrentTokenBalances do
+  use Ecto.Migration
+
+  def change do
+    alter table(:address_current_token_balances) do
+      add(:token_id, :numeric, precision: 78, scale: 0, null: true)
+      add(:token_type, :string, null: true)
+    end
+
+    create(index(:address_current_token_balances, [:token_id]))
+  end
+end

apps/explorer/test/explorer/chain/import_test.exs

@@ -428,13 +428,15 @@ defmodule Explorer.Chain.ImportTest do
               address_hash: "0xe8ddc5c7a2d2f0d7a9798459c0104fdf5e987aca",
               token_contract_address_hash: "0x8bf38d4764929064f2d4d3a56520a76ab3df415b",
               block_number: "37",
-              value: 200
+              value: 200,
+              token_type: "ERC-20"
             },
             %{
               address_hash: "0x515c09c5bba1ed566b02a5b0599ec5d5d0aee73d",
               token_contract_address_hash: "0x8bf38d4764929064f2d4d3a56520a76ab3df415b",
               block_number: "37",
-              value: 100
+              value: 100,
+              token_type: "ERC-20"
             }
           ],
           timeout: 5
@@ -2264,7 +2266,8 @@ defmodule Explorer.Chain.ImportTest do
                        address_hash: address_hash,
                        token_contract_address_hash: token_contract_address_hash,
                        block_number: block_number,
-                       value: value_after
+                       value: value_after,
+                       token_type: "ERC-20"
                      }
                    ]
                  },

apps/indexer/test/indexer/fetcher/token_balance_test.exs

@@ -76,22 +76,6 @@ defmodule Indexer.Fetcher.TokenBalanceTest do
       token_balance_a = insert(:token_balance, value_fetched_at: nil, value: nil)
       token_balance_b = insert(:token_balance, value_fetched_at: nil, value: nil)
 
-      expect(
-        EthereumJSONRPC.Mox,
-        :json_rpc,
-        1,
-        fn [%{id: id, method: "eth_call", params: [%{data: _, to: _}, _]}], _options ->
-          {:ok,
-           [
-             %{
-               error: %{code: -32015, data: "Reverted 0x", message: "VM execution error."},
-               id: id,
-               jsonrpc: "2.0"
-             }
-           ]}
-        end
-      )
-
       token_balances = [
         {
           token_balance_a.address_hash.bytes,