diff --git a/CHANGELOG.md b/CHANGELOG.md
index f9e00a2fbb..8227c01b41 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ### Features
 - [#3154](https://github.com/poanetwork/blockscout/pull/3154) - Support of Hyperledger Besu client
+- [#3153](https://github.com/poanetwork/blockscout/pull/3153) - Proxy contracts: logs decoding using implementation ABI
+- [#3153](https://github.com/poanetwork/blockscout/pull/3153) - Proxy contracts: methods decoding using implementation ABI
 - [#3149](https://github.com/poanetwork/blockscout/pull/3149) - Display and store revert reason of tx on demand at transaction details page and at gettxinfo API endpoint.
 
 ### Fixes
diff --git a/apps/explorer/lib/explorer/chain.ex b/apps/explorer/lib/explorer/chain.ex
index bd520b4e70..b0a7f06de9 100644
--- a/apps/explorer/lib/explorer/chain.ex
+++ b/apps/explorer/lib/explorer/chain.ex
@@ -74,6 +74,7 @@ defmodule Explorer.Chain do
   alias Explorer.Counters.{AddressesCounter, AddressesWithBalanceCounter}
   alias Explorer.Market.MarketHistoryCache
   alias Explorer.{PagingOptions, Repo}
+  alias Explorer.SmartContract.Reader
 
   alias Dataloader.Ecto, as: DataloaderEcto
 
@@ -4337,6 +4338,56 @@ defmodule Explorer.Chain do
     end
   end
 
+  def combine_proxy_implementation_abi(address_hash, abi) when not is_nil(abi) do
+    implementation_method_abi =
+      abi
+      |> Enum.find(fn method ->
+        Map.get(method, "name") == "implementation"
+      end)
+
+    implementation_abi =
+      if implementation_method_abi do
+        implementation_address =
+          case Reader.query_contract(address_hash, abi, %{
+                 "implementation" => []
+               }) do
+            %{"implementation" => {:ok, [result]}} -> result
+            _ -> nil
+          end
+
+        if implementation_address do
+          implementation_address_hash_string = "0x" <> Base.encode16(implementation_address, case: :lower)
+
+          case Chain.string_to_address_hash(implementation_address_hash_string) do
+            {:ok, implementation_address_hash} ->
+              implementation_smart_contract =
+                implementation_address_hash
+                |> Chain.address_hash_to_smart_contract()
+
+              if implementation_smart_contract do
+                implementation_smart_contract
+                |> Map.get(:abi)
+              else
+                []
+              end
+
+            _ ->
+              []
+          end
+        else
+          []
+        end
+      else
+        []
+      end
+
+    if Enum.empty?(implementation_abi), do: abi, else: implementation_abi ++ abi
+  end
+
+  def combine_proxy_implementation_abi(_, abi) when is_nil(abi) do
+    []
+  end
+
   defp format_tx_first_trace(first_trace, block_hash, json_rpc_named_arguments) do
     {:ok, to_address_hash} =
       if Map.has_key?(first_trace, :to_address_hash) do
diff --git a/apps/explorer/lib/explorer/chain/log.ex b/apps/explorer/lib/explorer/chain/log.ex
index 27899303f3..9592f0b2dd 100644
--- a/apps/explorer/lib/explorer/chain/log.ex
+++ b/apps/explorer/lib/explorer/chain/log.ex
@@ -6,8 +6,8 @@ defmodule Explorer.Chain.Log do
   require Logger
 
   alias ABI.{Event, FunctionSelector}
+  alias Explorer.{Chain, Repo}
   alias Explorer.Chain.{Address, Block, ContractMethod, Data, Hash, Transaction}
-  alias Explorer.Repo
 
   @required_attrs ~w(address_hash data block_hash index transaction_hash)a
   @optional_attrs ~w(first_topic second_topic third_topic fourth_topic type block_number)a
@@ -121,8 +121,11 @@ defmodule Explorer.Chain.Log do
   """
   def decode(_log, %Transaction{to_address: nil}), do: {:error, :no_to_address}
 
-  def decode(log, transaction = %Transaction{to_address: %{smart_contract: %{abi: abi}}}) when not is_nil(abi) do
-    with {:ok, selector, mapping} <- find_and_decode(abi, log, transaction),
+  def decode(log, transaction = %Transaction{to_address: %{smart_contract: %{abi: abi, address_hash: address_hash}}})
+      when not is_nil(abi) do
+    full_abi = Chain.combine_proxy_implementation_abi(address_hash, abi)
+
+    with {:ok, selector, mapping} <- find_and_decode(full_abi, log, transaction),
          identifier <- Base.encode16(selector.method_id, case: :lower),
          text <- function_call(selector.function, mapping),
          do: {:ok, identifier, text, mapping}
diff --git a/apps/explorer/lib/explorer/chain/transaction.ex b/apps/explorer/lib/explorer/chain/transaction.ex
index 9d60d58edd..e4518c7349 100644
--- a/apps/explorer/lib/explorer/chain/transaction.ex
+++ b/apps/explorer/lib/explorer/chain/transaction.ex
@@ -11,6 +11,8 @@ defmodule Explorer.Chain.Transaction do
 
   alias Ecto.Changeset
 
+  alias Explorer.{Chain, Repo}
+
   alias Explorer.Chain.{
     Address,
     Block,
@@ -26,7 +28,6 @@ defmodule Explorer.Chain.Transaction do
   }
 
   alias Explorer.Chain.Transaction.{Fork, Status}
-  alias Explorer.Repo
 
   @optional_attrs ~w(block_hash block_number created_contract_address_hash cumulative_gas_used earliest_processing_start
                      error gas_used index created_contract_code_indexed_at status
@@ -423,7 +424,7 @@ defmodule Explorer.Chain.Transaction do
       candidates_query
       |> Repo.all()
       |> Enum.flat_map(fn candidate ->
-        case do_decoded_input_data(data, [candidate.abi], hash) do
+        case do_decoded_input_data(data, [candidate.abi], nil, hash) do
           {:ok, _, _, _} = decoded -> [decoded]
           _ -> []
         end
@@ -436,12 +437,18 @@ defmodule Explorer.Chain.Transaction do
     {:error, :contract_not_verified, []}
   end
 
-  def decoded_input_data(%__MODULE__{input: %{bytes: data}, to_address: %{smart_contract: %{abi: abi}}, hash: hash}) do
-    do_decoded_input_data(data, abi, hash)
+  def decoded_input_data(%__MODULE__{
+        input: %{bytes: data},
+        to_address: %{smart_contract: %{abi: abi, address_hash: address_hash}},
+        hash: hash
+      }) do
+    do_decoded_input_data(data, abi, address_hash, hash)
   end
 
-  defp do_decoded_input_data(data, abi, hash) do
-    with {:ok, {selector, values}} <- find_and_decode(abi, data, hash),
+  defp do_decoded_input_data(data, abi, address_hash, hash) do
+    full_abi = Chain.combine_proxy_implementation_abi(address_hash, abi)
+
+    with {:ok, {selector, values}} <- find_and_decode(full_abi, data, hash),
          {:ok, mapping} <- selector_mapping(selector, values, hash),
          identifier <- Base.encode16(selector.method_id, case: :lower),
          text <- function_call(selector.function, mapping),
diff --git a/apps/explorer/test/explorer/chain_test.exs b/apps/explorer/test/explorer/chain_test.exs
index ed6d37aaa4..e374ab492c 100644
--- a/apps/explorer/test/explorer/chain_test.exs
+++ b/apps/explorer/test/explorer/chain_test.exs
@@ -5193,4 +5193,176 @@ defmodule Explorer.ChainTest do
       assert Chain.transaction_to_revert_reason(transaction) == "No credit of that type"
     end
   end
+
+  describe "combine_proxy_implementation_abi/2" do
+    @proxy_abi [
+      %{
+        "type" => "function",
+        "stateMutability" => "nonpayable",
+        "payable" => false,
+        "outputs" => [%{"type" => "bool", "name" => ""}],
+        "name" => "upgradeTo",
+        "inputs" => [%{"type" => "address", "name" => "newImplementation"}],
+        "constant" => false
+      },
+      %{
+        "type" => "function",
+        "stateMutability" => "view",
+        "payable" => false,
+        "outputs" => [%{"type" => "uint256", "name" => ""}],
+        "name" => "version",
+        "inputs" => [],
+        "constant" => true
+      },
+      %{
+        "type" => "function",
+        "stateMutability" => "view",
+        "payable" => false,
+        "outputs" => [%{"type" => "address", "name" => ""}],
+        "name" => "implementation",
+        "inputs" => [],
+        "constant" => true
+      },
+      %{
+        "type" => "function",
+        "stateMutability" => "nonpayable",
+        "payable" => false,
+        "outputs" => [],
+        "name" => "renounceOwnership",
+        "inputs" => [],
+        "constant" => false
+      },
+      %{
+        "type" => "function",
+        "stateMutability" => "view",
+        "payable" => false,
+        "outputs" => [%{"type" => "address", "name" => ""}],
+        "name" => "getOwner",
+        "inputs" => [],
+        "constant" => true
+      },
+      %{
+        "type" => "function",
+        "stateMutability" => "view",
+        "payable" => false,
+        "outputs" => [%{"type" => "address", "name" => ""}],
+        "name" => "getProxyStorage",
+        "inputs" => [],
+        "constant" => true
+      },
+      %{
+        "type" => "function",
+        "stateMutability" => "nonpayable",
+        "payable" => false,
+        "outputs" => [],
+        "name" => "transferOwnership",
+        "inputs" => [%{"type" => "address", "name" => "_newOwner"}],
+        "constant" => false
+      },
+      %{
+        "type" => "constructor",
+        "stateMutability" => "nonpayable",
+        "payable" => false,
+        "inputs" => [
+          %{"type" => "address", "name" => "_proxyStorage"},
+          %{"type" => "address", "name" => "_implementationAddress"}
+        ]
+      },
+      %{"type" => "fallback", "stateMutability" => "nonpayable", "payable" => false},
+      %{
+        "type" => "event",
+        "name" => "Upgraded",
+        "inputs" => [
+          %{"type" => "uint256", "name" => "version", "indexed" => false},
+          %{"type" => "address", "name" => "implementation", "indexed" => true}
+        ],
+        "anonymous" => false
+      },
+      %{
+        "type" => "event",
+        "name" => "OwnershipRenounced",
+        "inputs" => [%{"type" => "address", "name" => "previousOwner", "indexed" => true}],
+        "anonymous" => false
+      },
+      %{
+        "type" => "event",
+        "name" => "OwnershipTransferred",
+        "inputs" => [
+          %{"type" => "address", "name" => "previousOwner", "indexed" => true},
+          %{"type" => "address", "name" => "newOwner", "indexed" => true}
+        ],
+        "anonymous" => false
+      }
+    ]
+
+    @implementation_abi [
+      %{
+        "constant" => false,
+        "inputs" => [%{"name" => "x", "type" => "uint256"}],
+        "name" => "set",
+        "outputs" => [],
+        "payable" => false,
+        "stateMutability" => "nonpayable",
+        "type" => "function"
+      },
+      %{
+        "constant" => true,
+        "inputs" => [],
+        "name" => "get",
+        "outputs" => [%{"name" => "", "type" => "uint256"}],
+        "payable" => false,
+        "stateMutability" => "view",
+        "type" => "function"
+      }
+    ]
+
+    test "returns empty [] abi if proxy abi is null" do
+      proxy_contract_address = insert(:contract_address)
+      assert Chain.combine_proxy_implementation_abi(proxy_contract_address, nil) == []
+    end
+
+    test "returns [] abi for unverified proxy" do
+      proxy_contract_address = insert(:contract_address)
+      assert Chain.combine_proxy_implementation_abi(proxy_contract_address, []) == []
+    end
+
+    test "returns proxy abi if implementation is not verified" do
+      proxy_contract_address = insert(:contract_address)
+      insert(:smart_contract, address_hash: proxy_contract_address.hash, abi: @proxy_abi)
+      assert Chain.combine_proxy_implementation_abi(proxy_contract_address, @proxy_abi) == @proxy_abi
+    end
+
+    test "returns proxy + implementation abi if implementation is verified" do
+      proxy_contract_address = insert(:contract_address)
+      insert(:smart_contract, address_hash: proxy_contract_address.hash, abi: @proxy_abi)
+
+      implementation_contract_address = insert(:contract_address)
+      insert(:smart_contract, address_hash: implementation_contract_address.hash, abi: @implementation_abi)
+
+      implementation_contract_address_hash_string =
+        Base.encode16(implementation_contract_address.hash.bytes, case: :lower)
+
+      expect(
+        EthereumJSONRPC.Mox,
+        :json_rpc,
+        fn [%{id: id, method: _, params: [%{data: _, to: _}, _]}], _options ->
+          {:ok,
+           [
+             %{
+               id: id,
+               jsonrpc: "2.0",
+               result: "0x000000000000000000000000" <> implementation_contract_address_hash_string
+             }
+           ]}
+        end
+      )
+
+      combined_abi = Chain.combine_proxy_implementation_abi(proxy_contract_address.hash, @proxy_abi)
+
+      assert Enum.any?(@proxy_abi, fn el -> el == Enum.at(@implementation_abi, 0) end) == false
+      assert Enum.any?(@proxy_abi, fn el -> el == Enum.at(@implementation_abi, 1) end) == false
+      assert Enum.any?(combined_abi, fn el -> el == Enum.at(@implementation_abi, 0) end) == true
+      assert Enum.any?(combined_abi, fn el -> el == Enum.at(@implementation_abi, 1) end) == true
+    end
+  end
 end