Merge pull request #4745 from blockscout/vb-premium-vyper-contracts-verification-rebased

Vyper contracts verification

.dialyzer-ignore

@@ -5,8 +5,10 @@
 :0: Unknown type 'Elixir.Address':t/0
 apps/ethereum_jsonrpc/lib/ethereum_jsonrpc.ex:400: Function timestamp_to_datetime/1 has no local return
 lib/explorer/repo/prometheus_logger.ex:8
-lib/explorer/smart_contract/publisher_worker.ex:1
+lib/explorer/smart_contract/solidity/publisher_worker.ex:1
-lib/explorer/smart_contract/publisher_worker.ex:6
+lib/explorer/smart_contract/vyper/publisher_worker.ex:1
+lib/explorer/smart_contract/solidity/publisher_worker.ex:6
+lib/explorer/smart_contract/vyper/publisher_worker.ex:6
 apps/explorer/lib/explorer/repo/prometheus_logger.ex:8: Function microseconds_time/1 has no local return
 apps/explorer/lib/explorer/repo/prometheus_logger.ex:8: The call 'Elixir.System':convert_time_unit(__@1::any(),'native','microseconds') breaks the contract (integer(),time_unit() | 'native',time_unit() | 'native') -> integer()
 lib/block_scout_web/router.ex:1
@@ -21,7 +23,7 @@ lib/explorer/smart_contract/reader.ex:440
 lib/indexer/fetcher/token_total_supply_on_demand.ex:16
 lib/explorer/exchange_rates/source.ex:110
 lib/explorer/exchange_rates/source.ex:113
-lib/explorer/smart_contract/verifier.ex:89
+lib/explorer/smart_contract/solidity/verifier.ex:89
 lib/block_scout_web/templates/address_contract/index.html.eex:156
 lib/block_scout_web/templates/address_contract/index.html.eex:199
 lib/explorer/staking/stake_snapshotting.ex:15: Function do_snapshotting/7 has no local return

.github/workflows/config.yml

@@ -38,7 +38,7 @@ jobs:
           path: | 
             deps
             _build
-          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_2-${{ hashFiles('mix.lock') }}
+          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_3-${{ hashFiles('mix.lock') }}
           restore-keys: |
             ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-
 
@@ -98,7 +98,7 @@ jobs:
           path: | 
             deps
             _build
-          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_2-${{ hashFiles('mix.lock') }}
+          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_3-${{ hashFiles('mix.lock') }}
           restore-keys: |
             ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-"
 
@@ -122,7 +122,7 @@ jobs:
           path: | 
             deps
             _build
-          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_2-${{ hashFiles('mix.lock') }}
+          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_3-${{ hashFiles('mix.lock') }}
           restore-keys: |
             ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-"
 
@@ -145,7 +145,7 @@ jobs:
           path: | 
             deps
             _build
-          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_2-${{ hashFiles('mix.lock') }}
+          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_3-${{ hashFiles('mix.lock') }}
           restore-keys: |
             ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-"
 
@@ -154,7 +154,7 @@ jobs:
         id: dialyzer-cache
         with:
           path: priv/plts
-          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-dialyzer-mixlockhash_2-${{ hashFiles('mix.lock') }}
+          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-dialyzer-mixlockhash_3-${{ hashFiles('mix.lock') }}
           restore-keys: |
             ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-dialyzer-"
 
@@ -185,7 +185,7 @@ jobs:
           path: | 
             deps
             _build
-          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_2-${{ hashFiles('mix.lock') }}
+          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_3-${{ hashFiles('mix.lock') }}
           restore-keys: |
             ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-"
 
@@ -211,7 +211,7 @@ jobs:
           path: | 
             deps
             _build
-          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_2-${{ hashFiles('mix.lock') }}
+          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_3-${{ hashFiles('mix.lock') }}
           restore-keys: |
             ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-"
 
@@ -239,7 +239,7 @@ jobs:
           path: | 
             deps
             _build
-          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_2-${{ hashFiles('mix.lock') }}
+          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_3-${{ hashFiles('mix.lock') }}
           restore-keys: |
             ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-"
 
@@ -288,7 +288,7 @@ jobs:
           path: | 
             deps
             _build
-          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_2-${{ hashFiles('mix.lock') }}
+          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_3-${{ hashFiles('mix.lock') }}
           restore-keys: |
             ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-"
 
@@ -350,7 +350,7 @@ jobs:
           path: | 
             deps
             _build
-          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_2-${{ hashFiles('mix.lock') }}
+          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_3-${{ hashFiles('mix.lock') }}
           restore-keys: |
             ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-"
 
@@ -406,7 +406,7 @@ jobs:
           path: | 
             deps
             _build
-          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_2-${{ hashFiles('mix.lock') }}
+          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_3-${{ hashFiles('mix.lock') }}
           restore-keys: |
             ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-"
 
@@ -473,7 +473,7 @@ jobs:
           path: | 
             deps
             _build
-          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_2-${{ hashFiles('mix.lock') }}
+          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_3-${{ hashFiles('mix.lock') }}
           restore-keys: |
             ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-"
 
@@ -534,7 +534,7 @@ jobs:
           path: | 
             deps
             _build
-          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_2-${{ hashFiles('mix.lock') }}
+          key: ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-mixlockhash_3-${{ hashFiles('mix.lock') }}
           restore-keys: |
             ${{ runner.os }}-${{ env.ELIXIR_VERSION }}-${{ env.OTP_VERSION }}-${{ env.MIX_ENV }}-deps-"
 

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## Current
 
 ### Features
+- [#4745](https://github.com/blockscout/blockscout/pull/4745) - Vyper contracts verification
 - [#4667](https://github.com/blockscout/blockscout/pull/4667) - Transaction Page: Add expand/collapse button for long contract method data
 - [#4641](https://github.com/blockscout/blockscout/pull/4641), [#4733](https://github.com/blockscout/blockscout/pull/4733) - Improve Read Contract page logic
 - [#4660](https://github.com/blockscout/blockscout/pull/4660) - Save Sourcify path instead of filename

apps/block_scout_web/assets/js/pages/verification_form.js

@@ -233,6 +233,7 @@ if ($contractVerificationPage.length) {
     if ($(this).prop('checked')) {
       $('#verify_via_flattened_code_button').show()
       $('#verify_via_sourcify_button').hide()
+      $('#verify_vyper_contract_button').hide()
     }
   })
 
@@ -240,6 +241,15 @@ if ($contractVerificationPage.length) {
     if ($(this).prop('checked')) {
       $('#verify_via_flattened_code_button').hide()
       $('#verify_via_sourcify_button').show()
+      $('#verify_vyper_contract_button').hide()
+    }
+  })
+
+  $('.verify-vyper-contract').on('click', function () {
+    if ($(this).prop('checked')) {
+      $('#verify_via_flattened_code_button').hide()
+      $('#verify_via_sourcify_button').hide()
+      $('#verify_vyper_contract_button').show()
     }
   })
 }

apps/block_scout_web/assets/package-lock.json

@@ -77,7 +77,8 @@
     },
     "../../../deps/phoenix": {
       "version": "1.5.13",
-      "integrity": "sha512-aJKbnuCTtgH8qT7AzHhPwhOP3bqhja3ogFMQmUdY7jNzl/91nsUtpnz0M3HDW7j+IvfjiM2/TIkOaGwzW9BKhg=="
+      "integrity": "sha512-aJKbnuCTtgH8qT7AzHhPwhOP3bqhja3ogFMQmUdY7jNzl/91nsUtpnz0M3HDW7j+IvfjiM2/TIkOaGwzW9BKhg==",
+      "license": "MIT"
     },
     "../../../deps/phoenix_html": {
       "version": "2.14.3",

apps/block_scout_web/lib/block_scout_web/controllers/address_contract_verification_controller.ex

@@ -7,7 +7,9 @@ defmodule BlockScoutWeb.AddressContractVerificationController do
   alias Explorer.Chain
   alias Explorer.Chain.Events.Publisher, as: EventsPublisher
   alias Explorer.Chain.SmartContract
-  alias Explorer.SmartContract.{PublisherWorker, Solidity.CodeCompiler, Solidity.CompilerVersion}
+  alias Explorer.SmartContract.{CompilerVersion, Solidity.CodeCompiler}
+  alias Explorer.SmartContract.Solidity.PublisherWorker, as: SolidityPublisherWorker
+  alias Explorer.SmartContract.Vyper.PublisherWorker, as: VyperPublisherWorker
   alias Explorer.ThirdPartyIntegrations.Sourcify
 
   def new(conn, %{"address_id" => address_hash_string}) do
@@ -26,7 +28,7 @@ defmodule BlockScoutWeb.AddressContractVerificationController do
         )
 
       compiler_versions =
-        case CompilerVersion.fetch_versions() do
+        case CompilerVersion.fetch_versions(:solc) do
           {:ok, compiler_versions} ->
             compiler_versions
 
@@ -50,7 +52,18 @@ defmodule BlockScoutWeb.AddressContractVerificationController do
           "external_libraries" => external_libraries
         }
       ) do
-    Que.add(PublisherWorker, {smart_contract["address_hash"], smart_contract, external_libraries, conn})
+    Que.add(SolidityPublisherWorker, {smart_contract["address_hash"], smart_contract, external_libraries, conn})
+
+    send_resp(conn, 204, "")
+  end
+
+  def create(
+        conn,
+        %{
+          "smart_contract" => smart_contract
+        }
+      ) do
+    Que.add(VyperPublisherWorker, {smart_contract["address_hash"], smart_contract, conn})
 
     send_resp(conn, 204, "")
   end
@@ -104,7 +117,7 @@ defmodule BlockScoutWeb.AddressContractVerificationController do
   end
 
   def create(conn, _params) do
-    Que.add(PublisherWorker, {"", %{}, %{}, conn})
+    Que.add(SolidityPublisherWorker, {"", %{}, %{}, conn})
 
     send_resp(conn, 204, "")
   end

apps/block_scout_web/lib/block_scout_web/controllers/address_contract_verification_via_flattened_code_controller.ex

@@ -4,7 +4,7 @@ defmodule BlockScoutWeb.AddressContractVerificationViaFlattenedCodeController do
   alias BlockScoutWeb.Controller
   alias Explorer.Chain
   alias Explorer.Chain.SmartContract
-  alias Explorer.SmartContract.{PublisherWorker, Solidity.CodeCompiler, Solidity.CompilerVersion}
+  alias Explorer.SmartContract.{CompilerVersion, Solidity.CodeCompiler, Solidity.PublisherWorker}
 
   def new(conn, %{"address_id" => address_hash_string}) do
     if Chain.smart_contract_fully_verified?(address_hash_string) do
@@ -22,7 +22,7 @@ defmodule BlockScoutWeb.AddressContractVerificationViaFlattenedCodeController do
         )
 
       compiler_versions =
-        case CompilerVersion.fetch_versions() do
+        case CompilerVersion.fetch_versions(:solc) do
           {:ok, compiler_versions} ->
             compiler_versions
 

apps/block_scout_web/lib/block_scout_web/controllers/address_contract_verification_vyper_controller.ex

@@ -0,0 +1,47 @@
+defmodule BlockScoutWeb.AddressContractVerificationVyperController do
+  use BlockScoutWeb, :controller
+
+  alias Explorer.Chain.SmartContract
+  alias Explorer.SmartContract.{CompilerVersion, Vyper.PublisherWorker}
+
+  def new(conn, %{"address_id" => address_hash_string}) do
+    changeset =
+      SmartContract.changeset(
+        %SmartContract{address_hash: address_hash_string},
+        %{}
+      )
+
+    compiler_versions =
+      case CompilerVersion.fetch_versions(:vyper) do
+        {:ok, compiler_versions} ->
+          compiler_versions
+
+        {:error, _} ->
+          []
+      end
+
+    render(conn, "new.html",
+      changeset: changeset,
+      compiler_versions: compiler_versions,
+      address_hash: address_hash_string
+    )
+  end
+
+  def create(
+        conn,
+        %{
+          "smart_contract" => smart_contract
+        }
+      ) do
+    Que.add(PublisherWorker, {smart_contract["address_hash"], smart_contract, conn})
+
+    send_resp(conn, 204, "")
+  end
+
+  def parse_optimization_runs(%{"runs" => runs}) do
+    case Integer.parse(runs) do
+      {integer, ""} -> integer
+      _ -> 200
+    end
+  end
+end

apps/block_scout_web/lib/block_scout_web/controllers/api/rpc/contract_controller.ex

@@ -6,7 +6,8 @@ defmodule BlockScoutWeb.API.RPC.ContractController do
   alias Explorer.Chain
   alias Explorer.Chain.Events.Publisher, as: EventsPublisher
   alias Explorer.Chain.{Hash, SmartContract}
-  alias Explorer.SmartContract.Publisher
+  alias Explorer.SmartContract.Solidity.Publisher
+  alias Explorer.SmartContract.Vyper.Publisher, as: VyperPublisher
   alias Explorer.ThirdPartyIntegrations.Sourcify
 
   def verify(conn, %{"addressHash" => address_hash} = params) do
@@ -196,6 +197,40 @@ defmodule BlockScoutWeb.API.RPC.ContractController do
     end
   end
 
+  def verify_vyper_contract(conn, %{"addressHash" => address_hash} = params) do
+    with {:params, {:ok, fetched_params}} <- {:params, fetch_vyper_verify_params(params)},
+         {:format, {:ok, casted_address_hash}} <- to_address_hash(address_hash),
+         {:publish, {:ok, _}} <-
+           {:publish, VyperPublisher.publish(address_hash, fetched_params)} do
+      address = Chain.address_hash_to_address_with_source_code(casted_address_hash)
+
+      render(conn, :verify, %{contract: address})
+    else
+      {:publish,
+       {:error,
+        %Ecto.Changeset{
+          errors: [
+            address_hash:
+              {"has already been taken",
+               [
+                 constraint: :unique,
+                 constraint_name: "smart_contracts_address_hash_index"
+               ]}
+          ]
+        }}} ->
+        render(conn, :error, error: "Smart-contract already verified.")
+
+      {:publish, _} ->
+        render(conn, :error, error: "Something went wrong while publishing the contract.")
+
+      {:format, :error} ->
+        render(conn, :error, error: "Invalid address hash")
+
+      {:params, {:error, error}} ->
+        render(conn, :error, error: error)
+    end
+  end
+
   def publish_without_broadcast(
         %{"addressHash" => address_hash, "abi" => abi, "compilationTargetFilePath" => file_path} = input
       ) do
@@ -416,6 +451,15 @@ defmodule BlockScoutWeb.API.RPC.ContractController do
     |> parse_optimization_runs()
   end
 
+  defp fetch_vyper_verify_params(params) do
+    {:ok, %{}}
+    |> required_param(params, "addressHash", "address_hash")
+    |> required_param(params, "name", "name")
+    |> required_param(params, "compilerVersion", "compiler_version")
+    |> required_param(params, "contractSourceCode", "contract_source_code")
+    |> optional_param(params, "constructorArguments", "constructor_arguments")
+  end
+
   defp parse_optimization_runs({:ok, %{"optimization_runs" => runs} = opts}) when is_bitstring(runs) do
     {:ok, Map.put(opts, "optimization_runs", 200)}
   end

apps/block_scout_web/lib/block_scout_web/controllers/api/v1/verified_smart_contract_controller.ex

@@ -3,7 +3,7 @@ defmodule BlockScoutWeb.API.V1.VerifiedSmartContractController do
 
   alias Explorer.Chain
   alias Explorer.Chain.Hash.Address
-  alias Explorer.SmartContract.Publisher
+  alias Explorer.SmartContract.Solidity.Publisher
 
   def create(conn, params) do
     with {:ok, hash} <- validate_address_hash(params["address_hash"]),

apps/block_scout_web/lib/block_scout_web/etherscan.ex

@@ -2505,6 +2505,76 @@ defmodule BlockScoutWeb.Etherscan do
     ]
   }
 
+  @contract_verify_vyper_contract_action %{
+    name: "verify_vyper_contract",
+    description: """
+    Verify a vyper contract with its source code and contract creation information.
+    <br/>
+    <br/>
+    <p class="api-doc-list-item-text">curl POST example:</p>
+    <br/>
+    <div class='tab-content'>
+    <div class='tab-pane fade show active'>
+    <div class="tile tile-muted p-1">
+    <div class="m-2">
+    curl --location --request POST 'http://localhost:4000/api?module=contract&action=verify_vyper_contract' \
+    --form 'contractSourceCode="SOURCE_CODE"' \
+    --form 'name="Vyper_contract"' \
+    --form 'addressHash="0xE60B1B8bD493569a3E945be50A6c89d29a560Fa1"' \
+    --form 'compilerVersion="v0.2.12"'
+    </pre>
+    </div>
+    </div>
+    </div>
+    """,
+    required_params: [
+      %{
+        key: "addressHash",
+        placeholder: "addressHash",
+        type: "string",
+        description: "The address of the contract."
+      },
+      %{
+        key: "name",
+        placeholder: "name",
+        type: "string",
+        description: "The name of the contract."
+      },
+      %{
+        key: "compilerVersion",
+        placeholder: "compilerVersion",
+        type: "string",
+        description: "The compiler version for the contract."
+      },
+      %{
+        key: "contractSourceCode",
+        placeholder: "contractSourceCode",
+        type: "string",
+        description: "The source code of the contract."
+      }
+    ],
+    optional_params: [
+      %{
+        key: "constructorArguments",
+        type: "string",
+        description: "The constructor argument data provided."
+      }
+    ],
+    responses: [
+      %{
+        code: "200",
+        description: "successful operation",
+        example_value: Jason.encode!(@contract_verify_example_value),
+        type: "model",
+        model: @contract_model
+      },
+      %{
+        code: "200",
+        description: "error",
+        example_value: Jason.encode!(@contract_verify_example_value_error)
+      }
+    ]
+  }
   @contract_getabi_action %{
     name: "getabi",
     description: "Get ABI for verified contract. Also available through a GraphQL 'addresses' query.",
@@ -2750,7 +2820,8 @@ defmodule BlockScoutWeb.Etherscan do
       @contract_getabi_action,
       @contract_getsourcecode_action,
       @contract_verify_action,
-      @contract_verify_via_sourcify_action
+      @contract_verify_via_sourcify_action,
+      @contract_verify_vyper_contract_action
     ]
   }
 

apps/block_scout_web/lib/block_scout_web/notifier.ex

@@ -8,6 +8,7 @@ defmodule BlockScoutWeb.Notifier do
   alias BlockScoutWeb.{
     AddressContractVerificationViaFlattenedCodeView,
     AddressContractVerificationViaJsonView,
+    AddressContractVerificationVyperView,
     Endpoint
   }
 
@@ -17,7 +18,7 @@ defmodule BlockScoutWeb.Notifier do
   alias Explorer.Chain.Transaction.History.TransactionStats
   alias Explorer.Counters.AverageBlockTime
   alias Explorer.ExchangeRates.Token
-  alias Explorer.SmartContract.{Solidity.CodeCompiler, Solidity.CompilerVersion}
+  alias Explorer.SmartContract.{CompilerVersion, Solidity.CodeCompiler}
   alias Phoenix.View
 
   def handle_event({:chain_event, :addresses, type, addresses}) when type in [:realtime, :on_demand] do
@@ -47,6 +48,8 @@ defmodule BlockScoutWeb.Notifier do
         {:chain_event, :contract_verification_result, :on_demand, {address_hash, contract_verification_result, conn}}
       ) do
     verification_from_json_upload? = Map.has_key?(conn.params, "file")
+    verification_from_flattened_source? = Map.has_key?(conn.params, "external_libraries")
+    compiler = if verification_from_flattened_source?, do: :solc, else: :vyper
 
     contract_verification_result =
       case contract_verification_result do
@@ -55,7 +58,7 @@ defmodule BlockScoutWeb.Notifier do
 
         {:error, changeset} ->
           compiler_versions =
-            case CompilerVersion.fetch_versions() do
+            case CompilerVersion.fetch_versions(compiler) do
               {:ok, compiler_versions} ->
                 compiler_versions
 
@@ -64,10 +67,10 @@ defmodule BlockScoutWeb.Notifier do
             end
 
           view =
-            if verification_from_json_upload? do
+            cond do
-              AddressContractVerificationViaJsonView
+              verification_from_json_upload? -> AddressContractVerificationViaJsonView
-            else
+              verification_from_flattened_source? -> AddressContractVerificationViaFlattenedCodeView
-              AddressContractVerificationViaFlattenedCodeView
+              true -> AddressContractVerificationVyperView
             end
 
           result =

apps/block_scout_web/lib/block_scout_web/templates/address_contract/index.html.eex

@@ -51,7 +51,7 @@
             <div class="d-none d-sm-block d-md-none"></br></br></div>
             <div class="d-block d-sm-none"></br></br></div>
             <dt class="col-md-2 text-muted"><%= gettext "Optimization enabled" %></dt>
-            <dd class="col-md-4"><%= format_optimization_text(target_contract.optimization) %></dd>
+            <dd class="col-md-4"><%= if target_contract.is_vyper_contract, do: "N/A", else: format_optimization_text(target_contract.optimization) %></dd>
           </dl>
           <dl class="row">
             <dt class="col-md-2 text-muted"><%= gettext "Compiler version" %></dt>

apps/block_scout_web/lib/block_scout_web/templates/address_contract_verification/new.html.eex

@@ -26,18 +26,25 @@
 
         <div class="smart-contract-form-group">
           <div class="smart-contract-form-group-inner-wrapper">
-            <%= label f, "Verification via" %>
+            <%= label f, "Verify" %>
             <div class="center-column">
               <div class="form-radios-group vertical">
                 <div class="radio-big mb-3">
                   <%= radio_button f, :verify_via, true, checked: true, class: "form-check-input verify-via-flattened-code", "aria-describedby": "verify_via-help-block" %>
                   <div class="radio-icon"></div>
-                  <%= label :verify_via, :true, gettext("Flattened source code"), class: "radio-text" %>
+                  <%= label :verify_via, :true, gettext("Via flattened source code"), class: "radio-text" %>
                 </div>
+                <%= if Application.get_env(:explorer, Explorer.ThirdPartyIntegrations.Sourcify)[:enabled] do %>
                   <div class="radio-big">
                     <%= radio_button f, :verify_via, false, class: "form-check-input verify-via-sourcify" %>
                     <div class="radio-icon"></div>
-                  <%= label :verify_via, :false, gettext("Sourcify: Sources and metadata JSON file"), class: "radio-text" %>
+                    <%= label :verify_via, :false, gettext("Via Sourcify: Sources and metadata JSON file"), class: "radio-text" %>
+                  </div>
+                <% end %>
+                <div class="radio-big">
+                  <%= radio_button f, :verify_via, false, class: "form-check-input verify-vyper-contract" %>
+                  <div class="radio-icon"></div>
+                  <%= label :verify_via, :false, gettext("Vyper contract"), class: "radio-text" %>
                 </div>
               </div>
               <%= error_tag f, :verify_via, id: "verify_via-help-block", class: "text-danger form-error" %>
@@ -52,7 +59,9 @@
                       <i style="color: #f7b32b;" class="fa fa-info-circle ml-1" data-test="token-bridge-supply"></i></span><br/>
             2. Verification through <a href="https://sourcify.dev">Sourcify</a>.<br/>
               a) if smart-contract already verified on Sourcify, it will automatically fetch the data from the <a href="https://repo.sourcify.dev">repo</a><br/>
-              b) otherwise you will be asked to upload source files and JSON metadata file(s).</div>
+              b) otherwise you will be asked to upload source files and JSON metadata file(s).<br/>
+            3. Verification of Vyper contract.
+            </div>
               
           </div>
         </div>
@@ -86,6 +95,14 @@
             style: "display: none;",
             "data-button-loading": "animation"
           ) %>
+          <%= link(
+            gettext("Next"),
+            to: address_verify_vyper_contract_path(@conn, :new, @address_hash),
+            id: "verify_vyper_contract_button",
+            class: "btn-full-primary mr-2",
+            style: "display: none;",
+            "data-button-loading": "animation"
+          ) %>
           <%=
             link(
               gettext("Cancel"),

apps/block_scout_web/lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex

@@ -15,7 +15,7 @@
   </div>
 
   <div class="new-smart-contract-form">
-      <h1 class="smart-contract-title"><%= gettext "New Smart Contract Verification" %></h1>
+      <h1 class="smart-contract-title"><%= gettext "New Solidity Smart Contract Verification" %></h1>
 
       <%= form_for @changeset,
           address_contract_verification_path(@conn, :create),

apps/block_scout_web/lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex

@@ -0,0 +1,102 @@
+<% metadata_for_verification = Chain.get_address_verified_twin_contract(@address_hash).verified_contract %>
+<% contract_name_value = if metadata_for_verification, do: metadata_for_verification.name, else: "Vyper_contract" %>
+<% compiler_version = if metadata_for_verification, do: metadata_for_verification.compiler_version, else: "latest" %>
+<% contract_source_code_value = if metadata_for_verification, do: metadata_for_verification.contract_source_code, else: "" %>
+<section data-page="contract-verification" class="container new-smart-contract-container">
+  <div data-selector="channel-disconnected-message" class="d-none">
+    <div data-selector="reload-button" class="alert alert-danger">
+      <a href="#" class="alert-link"><%= gettext "Connection Lost" %></a>
+    </div>
+  </div>
+
+  <div class="new-smart-contract-form">
+      <h1 class="smart-contract-title"><%= gettext "New Vyper Smart Contract Verification" %></h1>
+
+      <%= form_for @changeset,
+          address_contract_verification_path(@conn, :create),
+          [],
+          fn f -> %>
+
+        <div class="smart-contract-form-group">
+          <div class="smart-contract-form-group-inner-wrapper">
+            <%= label f, :address_hash, gettext("Contract Address") %>
+            <div class="center-column">
+              <%= text_input f, :address_hash, class: "form-control border-rounded", "aria-describedby": "contract-address-help-block", readonly: true %>
+              <%= error_tag f, :address_hash, id: "contract-address-help-block", class: "text-danger form-error" %>
+            </div>
+            <div class="smart-contract-form-group-tooltip">The 0x address supplied on contract creation.</div>
+          </div>
+        </div>
+
+        <div class="smart-contract-form-group">
+          <div class="smart-contract-form-group-inner-wrapper">
+            <%= label f, :name, gettext("Contract Name") %>
+            <div class="center-column">
+              <%= text_input f, :name, class: "form-control border-rounded", "aria-describedby": "contract-name-help-block", "data-test": "contract_name", value: contract_name_value, disabled: "true" %>
+              <%= error_tag f, :name, id: "contract-name-help-block", class: "text-danger form-error" %>
+            </div>
+            <div class="smart-contract-form-group-tooltip">Must match the name specified in the code.</div>
+          </div>
+        </div>
+
+        <div class="smart-contract-form-group">
+          <div class="smart-contract-form-group-inner-wrapper">
+            <%= label f, :compiler_version, gettext("Compiler") %>
+            <div class="center-column">
+              <%= select f, :compiler_version, @compiler_versions, class: "form-control border-rounded", selected: compiler_version, "aria-describedby": "compiler-help-block" %>
+              <%= error_tag f, :compiler_version, id: "compiler-help-block", class: "text-danger form-error" %>
+            </div>
+            <div class="smart-contract-form-group-tooltip"></div>
+          </div>
+        </div>
+
+        <div class="smart-contract-form-group">
+          <div class="smart-contract-form-group-inner-wrapper">
+            <%= label f, :contract_source_code, gettext("Enter the Vyper Contract Code") %>
+            <div class="center-column">
+              <%= textarea f, :contract_source_code, class: "form-control border-rounded monospace", rows: 3, "aria-describedby": "contract-source-code-help-block", value: contract_source_code_value %>
+              <%= error_tag f, :contract_source_code, id: "contract-source-code-help-block", class: "text-danger form-error", "data-test": "contract-source-code-error" %>
+            </div>
+            <div class="smart-contract-form-group-tooltip"></div>
+          </div>
+        </div>
+
+        <div class="smart-contract-form-group constructor-arguments" style="display: block">
+          <div class="smart-contract-form-group-inner-wrapper">
+            <%= label f, :constructor_arguments, gettext("ABI-encoded Constructor Arguments (if required by the contract)") %>
+            <div class="center-column">
+              <%= textarea f, :constructor_arguments, class: "form-control border-rounded monospace", rows: 3, "aria-describedby": "contract-constructor-arguments-help-block" %>
+              <%= error_tag f, :constructor_arguments, id: "contract-constructor-arguments-help-block", class: "text-danger form-error", "data-test": "contract-constructor-arguments-error" %>
+            </div>
+            <div class="smart-contract-form-group-tooltip">Add arguments in <a href="https://solidity.readthedocs.io/en/develop/abi-spec.html" target="_blank">ABI hex encoded form</a>. Constructor arguments are written right to left, and will be found at the end of the input created bytecode. They may also be <a href="https://abi.hashex.org/" target="_blank">parsed here.</a></div>
+          </div>
+        </div>
+
+        <div class="smart-contract-form-buttons">
+          <button
+            class="position-absolute w-118 btn-full-primary d-none mr-2"
+            disabled="true"
+            id="loading"
+            name="button"
+            type="button"
+          >
+            <span class="loading-spinner-small mr-2">
+              <span class="loading-spinner-block-1"></span>
+              <span class="loading-spinner-block-2"></span>
+            </span>
+            <%= gettext("Loading....") %>
+          </button>
+          <%= submit gettext("Verify & publish"), class: "btn-full-primary mr-2", "data-button-loading": "animation"  %>
+          <%= reset gettext("Reset"), class: "btn-line mr-2 js-smart-contract-form-reset" %>
+          <%=
+            link(
+              gettext("Cancel"),
+              class: "btn-no-border",
+              to: address_contract_path(@conn, :index, @address_hash)
+              )
+          %>
+        </div>
+      <% end %>
+    </div>
+    <script defer data-cfasync="false" src="<%= static_path(@conn, "/js/verification-form.js") %>"></script>
+</section>

apps/block_scout_web/lib/block_scout_web/templates/address_logs/_logs.html.eex

@@ -6,13 +6,7 @@
         <%= gettext "To see accurate decoded input data, the contract must be verified." %>
         <%= case @log.transaction do %>
           <% %{to_address: %{hash: hash}} -> %>
-            <% path = 
+            <% path = address_verify_contract_path(@conn, :new, hash) %>
-              if Application.get_env(:explorer, Explorer.ThirdPartyIntegrations.Sourcify)[:enabled] do
-                address_verify_contract_path(@conn, :new, hash)
-              else
-                address_verify_contract_via_flattened_code_path(@conn, :new, hash)
-              end
-            %>
             <%= gettext "Verify the contract " %><a href="<%= path %>"><%= gettext "here" %></a>
           <% _ -> %>
             <%= nil %>

apps/block_scout_web/lib/block_scout_web/templates/layout/app.html.eex

@@ -219,6 +219,7 @@
       @view_module != Elixir.BlockScoutWeb.AddressContractVerificationView &&
       @view_module != Elixir.BlockScoutWeb.AddressContractVerificationViaJsonView &&
       @view_module != Elixir.BlockScoutWeb.AddressContractVerificationViaFlattenedCodeView &&
+      @view_module != Elixir.BlockScoutWeb.AddressContractVerificationVyperView &&
       @view_module != Elixir.BlockScoutWeb.AddressReadContractView &&
       @view_module != Elixir.BlockScoutWeb.AddressReadProxyView &&
       @view_module != Elixir.BlockScoutWeb.AddressWriteContractView &&

apps/block_scout_web/lib/block_scout_web/templates/smart_contract/_functions.html.eex

@@ -5,13 +5,7 @@
     <%= if minimal_proxy_template do %>
       <%= render BlockScoutWeb.CommonComponentsView, "_minimal_proxy_pattern.html", address_hash: metadata_for_verification.address_hash, conn: @conn %>
     <% else %>
-      <% path = 
+      <% path = address_verify_contract_path(@conn, :new, @address.hash) %>
-        if Application.get_env(:explorer, Explorer.ThirdPartyIntegrations.Sourcify)[:enabled] do
-          address_verify_contract_path(@conn, :new, @address.hash)
-        else
-          address_verify_contract_via_flattened_code_path(@conn, :new, @address.hash)
-        end
-      %>
       <div class="mb-4">
         <%= render BlockScoutWeb.CommonComponentsView, "_info.html" %><span> <%= gettext("Contract is not verified. However, we found a verified contract with the same bytecode in Blockscout DB") %> <%= link(
   metadata_for_verification.address_hash,

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

@@ -8,13 +8,7 @@
       <%= gettext "To see accurate decoded input data, the contract must be verified." %>
       <%= case @transaction do %>
         <% %{to_address: %{hash: hash}} -> %>
-          <% path = 
+          <% path = address_verify_contract_path(@conn, :new, hash) %>
-            if Application.get_env(:explorer, Explorer.ThirdPartyIntegrations.Sourcify)[:enabled] do
-              address_verify_contract_path(@conn, :new, hash)
-            else
-              address_verify_contract_via_flattened_code_path(@conn, :new, hash)
-            end
-          %>
           <%= gettext "Verify the contract " %><a href="<%= path %>"><%= gettext "here" %></a>
         <% _ -> %>
           <%= nil %>

apps/block_scout_web/lib/block_scout_web/templates/transaction_log/_logs.html.eex

@@ -6,13 +6,7 @@
       <%= gettext "To see accurate decoded input data, the contract must be verified." %>
       <%= case @transaction do %>
         <% %{to_address: %{hash: hash}} -> %>
-          <% path = 
+          <% path = address_verify_contract_path(@conn, :new, hash) %>
-            if Application.get_env(:explorer, Explorer.ThirdPartyIntegrations.Sourcify)[:enabled] do
-              address_verify_contract_path(@conn, :new, hash)
-            else
-              address_verify_contract_via_flattened_code_path(@conn, :new, hash)
-            end
-          %>
           <%= gettext "Verify the contract " %><a href="<%= path %>"><%= gettext "here" %></a>
         <% _ -> %>
           <%= nil %>

apps/block_scout_web/lib/block_scout_web/views/address_contract_verification_vyper_view.ex

@@ -0,0 +1,5 @@
+defmodule BlockScoutWeb.AddressContractVerificationVyperView do
+  use BlockScoutWeb, :view
+
+  alias Explorer.Chain
+end

apps/block_scout_web/lib/block_scout_web/web_router.ex

@@ -132,22 +132,6 @@ defmodule BlockScoutWeb.WebRouter do
         as: :verify_contract
       )
 
-      # if Application.get_env(:explorer, Explorer.ThirdPartyIntegrations.Sourcify)[:enabled] do
-      #   resources(
-      #     "/contract_verifications",
-      #     AddressContractVerificationController,
-      #     only: [:new],
-      #     as: :verify_contract
-      #   )
-      # else
-      #   resources(
-      #     "/contract_verifications",
-      #     AddressContractVerificationViaFlattenedCodeController,
-      #     only: [:new],
-      #     as: :verify_contract
-      #   )
-      # end
-
       resources(
         "/verify-via-flattened-code",
         AddressContractVerificationViaFlattenedCodeController,
@@ -162,6 +146,13 @@ defmodule BlockScoutWeb.WebRouter do
         as: :verify_contract_via_json
       )
 
+      resources(
+        "/verify-vyper-contract",
+        AddressContractVerificationVyperController,
+        only: [:new],
+        as: :verify_vyper_contract
+      )
+
       resources(
         "/read-contract",
         AddressReadContractController,

apps/block_scout_web/priv/gettext/default.pot

@@ -125,6 +125,7 @@ msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:156
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:66
 msgid "ABI-encoded Constructor Arguments (if required by the contract)"
 msgstr ""
 
@@ -170,7 +171,7 @@ msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/address/_validator_metadata_modal.html.eex:16
-#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:26 lib/block_scout_web/views/address_view.ex:104
+#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:20 lib/block_scout_web/views/address_view.ex:104
 msgid "Address"
 msgstr ""
 
@@ -199,7 +200,7 @@ msgid "All"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:18
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:12
 msgid "All functions displayed below are from ABI of that contract. In order to verify current contract, proceed with"
 msgstr ""
 
@@ -434,9 +435,10 @@ msgid "Call Code"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:91
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:108
 #: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:305
-#: lib/block_scout_web/templates/address_contract_verification_via_json/new.html.eex:56 lib/block_scout_web/templates/api_docs/_action_tile.html.eex:47
+#: lib/block_scout_web/templates/address_contract_verification_via_json/new.html.eex:56
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:93 lib/block_scout_web/templates/api_docs/_action_tile.html.eex:47
 #: lib/block_scout_web/templates/api_docs/_eth_rpc_item.html.eex:54
 msgid "Cancel"
 msgstr ""
@@ -526,6 +528,7 @@ msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:71
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:44
 msgid "Compiler"
 msgstr ""
 
@@ -552,7 +555,8 @@ msgstr ""
 #, elixir-format
 #: lib/block_scout_web/templates/address_contract_verification/new.html.eex:4
 #: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:13
-#: lib/block_scout_web/templates/address_contract_verification_via_json/new.html.eex:4 lib/block_scout_web/templates/tokens/holder/index.html.eex:17
+#: lib/block_scout_web/templates/address_contract_verification_via_json/new.html.eex:4
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:8 lib/block_scout_web/templates/tokens/holder/index.html.eex:17
 msgid "Connection Lost"
 msgstr ""
 
@@ -596,7 +600,8 @@ msgstr ""
 #, elixir-format
 #: lib/block_scout_web/templates/address_contract_verification/new.html.eex:18
 #: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:27
-#: lib/block_scout_web/templates/address_contract_verification_via_json/new.html.eex:13 lib/block_scout_web/views/address_view.ex:102
+#: lib/block_scout_web/templates/address_contract_verification_via_json/new.html.eex:13
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:22 lib/block_scout_web/views/address_view.ex:102
 msgid "Contract Address"
 msgstr ""
 
@@ -629,12 +634,13 @@ msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:38
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:33
 msgid "Contract Name"
 msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/address_contract/index.html.eex:22
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:16
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:10
 msgid "Contract is not verified. However, we found a verified contract with the same bytecode in Blockscout DB"
 msgstr ""
 
@@ -817,9 +823,9 @@ msgid "DApp for Staking %{symbol} tokens"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_logs/_logs.html.eex:107
+#: lib/block_scout_web/templates/address_logs/_logs.html.eex:101
 #: lib/block_scout_web/templates/log/_data_decoded_view.html.eex:7 lib/block_scout_web/templates/transaction/_decoded_input_body.html.eex:21
-#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:110
+#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:104
 msgid "Data"
 msgstr ""
 
@@ -840,10 +846,10 @@ msgid "Decimals"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_logs/_logs.html.eex:38
+#: lib/block_scout_web/templates/address_logs/_logs.html.eex:32
-#: lib/block_scout_web/templates/address_logs/_logs.html.eex:44 lib/block_scout_web/templates/address_logs/_logs.html.eex:59
+#: lib/block_scout_web/templates/address_logs/_logs.html.eex:38 lib/block_scout_web/templates/address_logs/_logs.html.eex:53
-#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:39 lib/block_scout_web/templates/transaction_log/_logs.html.eex:47
+#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:33 lib/block_scout_web/templates/transaction_log/_logs.html.eex:41
-#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:62
+#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:56
 msgid "Decoded"
 msgstr ""
 
@@ -943,8 +949,8 @@ msgid "ERC-721 "
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:95
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:89
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:95 lib/block_scout_web/templates/smart_contract/_functions.html.eex:131
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:89 lib/block_scout_web/templates/smart_contract/_functions.html.eex:125
 msgid "ETH"
 msgstr ""
 
@@ -1047,13 +1053,13 @@ msgid "External libraries"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:39
+#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:33
 msgid "Failed to decode input data."
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_logs/_logs.html.eex:41
+#: lib/block_scout_web/templates/address_logs/_logs.html.eex:35
-#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:42
+#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:36
 msgid "Failed to decode log data."
 msgstr ""
 
@@ -1067,11 +1073,6 @@ msgstr ""
 msgid "Fetching tokens..."
 msgstr ""
 
-#, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:35
-msgid "Flattened source code"
-msgstr ""
-
 #, elixir-format
 #: lib/block_scout_web/templates/admin/dashboard/index.html.eex:16
 msgid "For any existing contracts in the database, insert all ABI entries into the contract_methods table. Use this in case you have verified smart contracts before early March 2019 and you want other contracts with the same functions to show those ABI's as candidate matches."
@@ -1165,7 +1166,7 @@ msgid "However, in general, the"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:25
+#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:19
 msgid "IMPORTANT: This information is a best guess based on similar functions from other verified contracts."
 msgstr ""
 
@@ -1340,9 +1341,10 @@ msgid "Loading..."
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:72
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:81
 #: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:299
 #: lib/block_scout_web/templates/address_contract_verification_via_json/new.html.eex:50
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:87
 msgid "Loading...."
 msgstr ""
 
@@ -1352,7 +1354,7 @@ msgid "Log Data"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:120
+#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:114
 msgid "Log Index"
 msgstr ""
 
@@ -1512,14 +1514,13 @@ msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/address_contract_verification/new.html.eex:9
-#: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:18
 #: lib/block_scout_web/templates/address_contract_verification_via_json/new.html.eex:9
 msgid "New Smart Contract Verification"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:75
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:84
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:82
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:91 lib/block_scout_web/templates/address_contract_verification/new.html.eex:99
 msgid "Next"
 msgstr ""
 
@@ -1672,7 +1673,7 @@ msgid "Potential Reward Share"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:24
+#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:18
 msgid "Potential matches from our contract method database:"
 msgstr ""
 
@@ -1710,7 +1711,7 @@ msgid "QR Code"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:99
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:93
 msgid "Query"
 msgstr ""
 
@@ -1776,6 +1777,7 @@ msgstr ""
 #, elixir-format
 #: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:302
 #: lib/block_scout_web/templates/address_contract_verification_via_json/new.html.eex:53
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:90
 msgid "Reset"
 msgstr ""
 
@@ -1944,11 +1946,6 @@ msgstr ""
 msgid "Sources and Metadata JSON"
 msgstr ""
 
-#, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:40
-msgid "Sourcify: Sources and metadata JSON file"
-msgstr ""
-
 #, elixir-format
 #: lib/block_scout_web/templates/stakes/_stakes_modal_stake.html.eex:7
 msgid "Stake"
@@ -2089,7 +2086,7 @@ msgid "The block height of a particular block is defined as the number of blocks
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:43
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:37
 msgid "The fallback function is executed on a call to the contract if none of the other functions match the given function signature, or if no data was supplied at all and there is no receive Ether function. The fallback function always receives data, but in order to also receive Ether it must be marked payable."
 msgstr ""
 
@@ -2129,7 +2126,7 @@ msgid "The percentage of stake in a single pool relative to the total amount sta
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:45
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:39
 msgid "The receive function is executed on a call to the contract with empty calldata. This is the function that is executed on plain Ether transfers (e.g. via .send() or .transfer()). If no such function exists, but a payable fallback function exists, the fallback function will be called on a plain Ether transfer. If neither a receive Ether nor a payable fallback function is present, the contract cannot receive Ether through regular transactions and throws an exception."
 msgstr ""
 
@@ -2330,7 +2327,7 @@ msgid "To"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:26
+#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:20
 msgid "To have guaranteed accuracy, use the link above to verify the contract's source code."
 msgstr ""
 
@@ -2436,8 +2433,8 @@ msgid "Topic"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_logs/_logs.html.eex:77
+#: lib/block_scout_web/templates/address_logs/_logs.html.eex:71
-#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:80
+#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:74
 msgid "Topics"
 msgstr ""
 
@@ -2482,7 +2479,7 @@ msgid "Trade STAKE on BitMax"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_logs/_logs.html.eex:25
+#: lib/block_scout_web/templates/address_logs/_logs.html.eex:19
 #: lib/block_scout_web/views/transaction_view.ex:463
 msgid "Transaction"
 msgstr ""
@@ -2711,19 +2708,20 @@ msgstr ""
 #: lib/block_scout_web/templates/address_contract/index.html.eex:24
 #: lib/block_scout_web/templates/address_contract/index.html.eex:158 lib/block_scout_web/templates/address_contract/index.html.eex:170
 #: lib/block_scout_web/templates/address_contract/index.html.eex:201 lib/block_scout_web/templates/address_contract/index.html.eex:213
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:19
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:13
 msgid "Verify & Publish"
 msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:301
 #: lib/block_scout_web/templates/address_contract_verification_via_json/new.html.eex:52
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:89
 msgid "Verify & publish"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_logs/_logs.html.eex:16
+#: lib/block_scout_web/templates/address_logs/_logs.html.eex:10
-#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:18 lib/block_scout_web/templates/transaction_log/_logs.html.eex:16
+#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:12 lib/block_scout_web/templates/transaction_log/_logs.html.eex:10
 msgid "Verify the contract "
 msgstr ""
 
@@ -2774,7 +2772,7 @@ msgid "View transaction %{transaction} on %{subnetwork}"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:130
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:124
 msgid "WEI"
 msgstr ""
 
@@ -2824,7 +2822,7 @@ msgid "Working Stake Amount"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:99
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:93
 msgid "Write"
 msgstr ""
 
@@ -2939,7 +2937,7 @@ msgid "custom RPC"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:43
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:37
 msgid "fallback"
 msgstr ""
 
@@ -2949,8 +2947,8 @@ msgid "false"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_logs/_logs.html.eex:16
+#: lib/block_scout_web/templates/address_logs/_logs.html.eex:10
-#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:18 lib/block_scout_web/templates/transaction_log/_logs.html.eex:16
+#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:12 lib/block_scout_web/templates/transaction_log/_logs.html.eex:10
 msgid "here"
 msgstr ""
 
@@ -2970,7 +2968,7 @@ msgid "of"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:21
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:15
 msgid "page"
 msgstr ""
 
@@ -2980,7 +2978,7 @@ msgid "pool owner"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:45
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:39
 msgid "receive"
 msgstr ""
 
@@ -3046,3 +3044,33 @@ msgstr ""
 #: lib/block_scout_web/templates/block/overview.html.eex:209
 msgid "burned from transactions included in the block (Base fee (per unit of gas) * Gas Used)."
 msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:55
+msgid "Enter the Vyper Contract Code"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:18
+msgid "New Solidity Smart Contract Verification"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:13
+msgid "New Vyper Smart Contract Verification"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:41
+msgid "Via Sourcify: Sources and metadata JSON file"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:35
+msgid "Via flattened source code"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:47
+msgid "Vyper contract"
+msgstr ""

apps/block_scout_web/priv/gettext/en/LC_MESSAGES/default.po

@@ -125,6 +125,7 @@ msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:156
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:66
 msgid "ABI-encoded Constructor Arguments (if required by the contract)"
 msgstr ""
 
@@ -170,7 +171,7 @@ msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/address/_validator_metadata_modal.html.eex:16
-#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:26 lib/block_scout_web/views/address_view.ex:104
+#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:20 lib/block_scout_web/views/address_view.ex:104
 msgid "Address"
 msgstr ""
 
@@ -199,7 +200,7 @@ msgid "All"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:18
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:12
 msgid "All functions displayed below are from ABI of that contract. In order to verify current contract, proceed with"
 msgstr ""
 
@@ -434,9 +435,10 @@ msgid "Call Code"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:91
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:108
 #: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:305
-#: lib/block_scout_web/templates/address_contract_verification_via_json/new.html.eex:56 lib/block_scout_web/templates/api_docs/_action_tile.html.eex:47
+#: lib/block_scout_web/templates/address_contract_verification_via_json/new.html.eex:56
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:93 lib/block_scout_web/templates/api_docs/_action_tile.html.eex:47
 #: lib/block_scout_web/templates/api_docs/_eth_rpc_item.html.eex:54
 msgid "Cancel"
 msgstr ""
@@ -526,6 +528,7 @@ msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:71
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:44
 msgid "Compiler"
 msgstr ""
 
@@ -552,7 +555,8 @@ msgstr ""
 #, elixir-format
 #: lib/block_scout_web/templates/address_contract_verification/new.html.eex:4
 #: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:13
-#: lib/block_scout_web/templates/address_contract_verification_via_json/new.html.eex:4 lib/block_scout_web/templates/tokens/holder/index.html.eex:17
+#: lib/block_scout_web/templates/address_contract_verification_via_json/new.html.eex:4
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:8 lib/block_scout_web/templates/tokens/holder/index.html.eex:17
 msgid "Connection Lost"
 msgstr ""
 
@@ -596,7 +600,8 @@ msgstr ""
 #, elixir-format
 #: lib/block_scout_web/templates/address_contract_verification/new.html.eex:18
 #: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:27
-#: lib/block_scout_web/templates/address_contract_verification_via_json/new.html.eex:13 lib/block_scout_web/views/address_view.ex:102
+#: lib/block_scout_web/templates/address_contract_verification_via_json/new.html.eex:13
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:22 lib/block_scout_web/views/address_view.ex:102
 msgid "Contract Address"
 msgstr ""
 
@@ -629,12 +634,13 @@ msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:38
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:33
 msgid "Contract Name"
 msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/address_contract/index.html.eex:22
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:16
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:10
 msgid "Contract is not verified. However, we found a verified contract with the same bytecode in Blockscout DB"
 msgstr ""
 
@@ -817,9 +823,9 @@ msgid "DApp for Staking %{symbol} tokens"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_logs/_logs.html.eex:107
+#: lib/block_scout_web/templates/address_logs/_logs.html.eex:101
 #: lib/block_scout_web/templates/log/_data_decoded_view.html.eex:7 lib/block_scout_web/templates/transaction/_decoded_input_body.html.eex:21
-#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:110
+#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:104
 msgid "Data"
 msgstr ""
 
@@ -840,10 +846,10 @@ msgid "Decimals"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_logs/_logs.html.eex:38
+#: lib/block_scout_web/templates/address_logs/_logs.html.eex:32
-#: lib/block_scout_web/templates/address_logs/_logs.html.eex:44 lib/block_scout_web/templates/address_logs/_logs.html.eex:59
+#: lib/block_scout_web/templates/address_logs/_logs.html.eex:38 lib/block_scout_web/templates/address_logs/_logs.html.eex:53
-#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:39 lib/block_scout_web/templates/transaction_log/_logs.html.eex:47
+#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:33 lib/block_scout_web/templates/transaction_log/_logs.html.eex:41
-#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:62
+#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:56
 msgid "Decoded"
 msgstr ""
 
@@ -943,8 +949,8 @@ msgid "ERC-721 "
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:95
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:89
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:95 lib/block_scout_web/templates/smart_contract/_functions.html.eex:131
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:89 lib/block_scout_web/templates/smart_contract/_functions.html.eex:125
 msgid "ETH"
 msgstr ""
 
@@ -1047,13 +1053,13 @@ msgid "External libraries"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:39
+#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:33
 msgid "Failed to decode input data."
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_logs/_logs.html.eex:41
+#: lib/block_scout_web/templates/address_logs/_logs.html.eex:35
-#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:42
+#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:36
 msgid "Failed to decode log data."
 msgstr ""
 
@@ -1067,11 +1073,6 @@ msgstr ""
 msgid "Fetching tokens..."
 msgstr ""
 
-#, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:35
-msgid "Flattened source code"
-msgstr ""
-
 #, elixir-format
 #: lib/block_scout_web/templates/admin/dashboard/index.html.eex:16
 msgid "For any existing contracts in the database, insert all ABI entries into the contract_methods table. Use this in case you have verified smart contracts before early March 2019 and you want other contracts with the same functions to show those ABI's as candidate matches."
@@ -1165,7 +1166,7 @@ msgid "However, in general, the"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:25
+#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:19
 msgid "IMPORTANT: This information is a best guess based on similar functions from other verified contracts."
 msgstr ""
 
@@ -1340,9 +1341,10 @@ msgid "Loading..."
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:72
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:81
 #: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:299
 #: lib/block_scout_web/templates/address_contract_verification_via_json/new.html.eex:50
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:87
 msgid "Loading...."
 msgstr ""
 
@@ -1352,7 +1354,7 @@ msgid "Log Data"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:120
+#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:114
 msgid "Log Index"
 msgstr ""
 
@@ -1512,14 +1514,13 @@ msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/address_contract_verification/new.html.eex:9
-#: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:18
 #: lib/block_scout_web/templates/address_contract_verification_via_json/new.html.eex:9
 msgid "New Smart Contract Verification"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:75
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:84
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:82
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:91 lib/block_scout_web/templates/address_contract_verification/new.html.eex:99
 msgid "Next"
 msgstr ""
 
@@ -1672,7 +1673,7 @@ msgid "Potential Reward Share"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:24
+#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:18
 msgid "Potential matches from our contract method database:"
 msgstr ""
 
@@ -1710,7 +1711,7 @@ msgid "QR Code"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:99
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:93
 msgid "Query"
 msgstr ""
 
@@ -1776,6 +1777,7 @@ msgstr ""
 #, elixir-format
 #: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:302
 #: lib/block_scout_web/templates/address_contract_verification_via_json/new.html.eex:53
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:90
 msgid "Reset"
 msgstr ""
 
@@ -1944,11 +1946,6 @@ msgstr ""
 msgid "Sources and Metadata JSON"
 msgstr ""
 
-#, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:40
-msgid "Sourcify: Sources and metadata JSON file"
-msgstr ""
-
 #, elixir-format
 #: lib/block_scout_web/templates/stakes/_stakes_modal_stake.html.eex:7
 msgid "Stake"
@@ -2089,7 +2086,7 @@ msgid "The block height of a particular block is defined as the number of blocks
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:43
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:37
 msgid "The fallback function is executed on a call to the contract if none of the other functions match the given function signature, or if no data was supplied at all and there is no receive Ether function. The fallback function always receives data, but in order to also receive Ether it must be marked payable."
 msgstr ""
 
@@ -2129,7 +2126,7 @@ msgid "The percentage of stake in a single pool relative to the total amount sta
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:45
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:39
 msgid "The receive function is executed on a call to the contract with empty calldata. This is the function that is executed on plain Ether transfers (e.g. via .send() or .transfer()). If no such function exists, but a payable fallback function exists, the fallback function will be called on a plain Ether transfer. If neither a receive Ether nor a payable fallback function is present, the contract cannot receive Ether through regular transactions and throws an exception."
 msgstr ""
 
@@ -2330,7 +2327,7 @@ msgid "To"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:26
+#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:20
 msgid "To have guaranteed accuracy, use the link above to verify the contract's source code."
 msgstr ""
 
@@ -2436,8 +2433,8 @@ msgid "Topic"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_logs/_logs.html.eex:77
+#: lib/block_scout_web/templates/address_logs/_logs.html.eex:71
-#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:80
+#: lib/block_scout_web/templates/transaction_log/_logs.html.eex:74
 msgid "Topics"
 msgstr ""
 
@@ -2482,7 +2479,7 @@ msgid "Trade STAKE on BitMax"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_logs/_logs.html.eex:25
+#: lib/block_scout_web/templates/address_logs/_logs.html.eex:19
 #: lib/block_scout_web/views/transaction_view.ex:463
 msgid "Transaction"
 msgstr ""
@@ -2711,19 +2708,20 @@ msgstr ""
 #: lib/block_scout_web/templates/address_contract/index.html.eex:24
 #: lib/block_scout_web/templates/address_contract/index.html.eex:158 lib/block_scout_web/templates/address_contract/index.html.eex:170
 #: lib/block_scout_web/templates/address_contract/index.html.eex:201 lib/block_scout_web/templates/address_contract/index.html.eex:213
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:19
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:13
 msgid "Verify & Publish"
 msgstr ""
 
 #, elixir-format
 #: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:301
 #: lib/block_scout_web/templates/address_contract_verification_via_json/new.html.eex:52
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:89
 msgid "Verify & publish"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_logs/_logs.html.eex:16
+#: lib/block_scout_web/templates/address_logs/_logs.html.eex:10
-#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:18 lib/block_scout_web/templates/transaction_log/_logs.html.eex:16
+#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:12 lib/block_scout_web/templates/transaction_log/_logs.html.eex:10
 msgid "Verify the contract "
 msgstr ""
 
@@ -2774,7 +2772,7 @@ msgid "View transaction %{transaction} on %{subnetwork}"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:130
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:124
 msgid "WEI"
 msgstr ""
 
@@ -2824,7 +2822,7 @@ msgid "Working Stake Amount"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:99
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:93
 msgid "Write"
 msgstr ""
 
@@ -2939,7 +2937,7 @@ msgid "custom RPC"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:43
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:37
 msgid "fallback"
 msgstr ""
 
@@ -2949,8 +2947,8 @@ msgid "false"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_logs/_logs.html.eex:16
+#: lib/block_scout_web/templates/address_logs/_logs.html.eex:10
-#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:18 lib/block_scout_web/templates/transaction_log/_logs.html.eex:16
+#: lib/block_scout_web/templates/transaction/_decoded_input.html.eex:12 lib/block_scout_web/templates/transaction_log/_logs.html.eex:10
 msgid "here"
 msgstr ""
 
@@ -2970,7 +2968,7 @@ msgid "of"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:21
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:15
 msgid "page"
 msgstr ""
 
@@ -2980,7 +2978,7 @@ msgid "pool owner"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:45
+#: lib/block_scout_web/templates/smart_contract/_functions.html.eex:39
 msgid "receive"
 msgstr ""
 
@@ -3046,3 +3044,33 @@ msgstr ""
 #: lib/block_scout_web/templates/block/overview.html.eex:209
 msgid "burned from transactions included in the block (Base fee (per unit of gas) * Gas Used)."
 msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:55
+msgid "Enter the Vyper Contract Code"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_contract_verification_via_flattened_code/new.html.eex:18
+msgid "New Solidity Smart Contract Verification"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_contract_verification_vyper/new.html.eex:13
+msgid "New Vyper Smart Contract Verification"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:41
+msgid "Via Sourcify: Sources and metadata JSON file"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:35
+msgid "Via flattened source code"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:47
+msgid "Vyper contract"
+msgstr ""

apps/explorer/.gitignore

@@ -1,2 +1,3 @@
 priv/.recovery
 priv/solc_compilers/
+priv/vyper_compilers/

apps/explorer/.sobelow-conf

@@ -6,6 +6,7 @@
   format: "compact",
   ignore: ["Config.HTTPS"],
   ignore_files: [
-    "lib/explorer/smart_contract/solidity/code_compiler.ex"
+    "lib/explorer/smart_contract/solidity/code_compiler.ex",
+    "lib/explorer/smart_contract/vyper/code_compiler.ex"
   ]
 ]

apps/explorer/lib/explorer/application.ex

@@ -47,6 +47,7 @@ defmodule Explorer.Application do
       Supervisor.child_spec({Task.Supervisor, name: Explorer.GenesisDataTaskSupervisor}, id: GenesisDataTaskSupervisor),
       Supervisor.child_spec({Task.Supervisor, name: Explorer.TaskSupervisor}, id: Explorer.TaskSupervisor),
       Explorer.SmartContract.SolcDownloader,
+      Explorer.SmartContract.VyperDownloader,
       {Registry, keys: :duplicate, name: Registry.ChainEvents, id: Registry.ChainEvents},
       {Admin.Recovery, [[], [name: Admin.Recovery]]},
       TransactionCount,

apps/explorer/lib/explorer/chain.ex

@@ -3668,9 +3668,11 @@ defmodule Explorer.Chain do
     creation_tx_query =
       from(
         tx in Transaction,
+        left_join: a in Address,
+        on: tx.created_contract_address_hash == a.hash,
         where: tx.created_contract_address_hash == ^address_hash,
         where: tx.status == ^1,
-        select: tx.input
+        select: %{init: tx.input, created_contract_code: a.contract_code}
       )
 
     tx_input =
@@ -3678,7 +3680,9 @@ defmodule Explorer.Chain do
       |> Repo.one()
 
     if tx_input do
-      Data.to_string(tx_input)
+      with %{init: input, created_contract_code: created_contract_code} <- tx_input do
+        %{init: Data.to_string(input), created_contract_code: Data.to_string(created_contract_code)}
+      end
     else
       creation_int_tx_query =
         from(
@@ -3686,16 +3690,18 @@ defmodule Explorer.Chain do
           join: t in assoc(itx, :transaction),
           where: itx.created_contract_address_hash == ^address_hash,
           where: t.status == ^1,
-          select: itx.init
+          select: %{init: itx.init, created_contract_code: itx.created_contract_code}
         )
 
-      itx_init_code =
+      res = creation_int_tx_query |> Repo.one()
-        creation_int_tx_query
-        |> Repo.one()
 
-      if itx_init_code do
+      case res do
-        Data.to_string(itx_init_code)
+        %{init: init, created_contract_code: created_contract_code} ->
-      else
+          init_str = Data.to_string(init)
+          created_contract_code_str = Data.to_string(created_contract_code)
+          %{init: init_str, created_contract_code: created_contract_code_str}
+
+        _ ->
           nil
       end
     end

apps/explorer/lib/explorer/chain/smart_contract.ex

@@ -194,6 +194,7 @@ defmodule Explorer.Chain.SmartContract do
     contract.
   * `verified_via_sourcify` - whether contract verified through Sourcify utility or not.
   * `partially_verified` - whether contract verified using partial matched source code or not.
+  * `is_vyper_contract` - boolean flag, determines if contract is Vyper or not
   """
 
   @type t :: %Explorer.Chain.SmartContract{
@@ -207,7 +208,8 @@ defmodule Explorer.Chain.SmartContract do
           abi: [function_description],
           verified_via_sourcify: boolean | nil,
           partially_verified: boolean | nil,
-          file_path: String.t()
+          file_path: String.t(),
+          is_vyper_contract: boolean | nil
         }
 
   schema "smart_contracts" do
@@ -223,6 +225,7 @@ defmodule Explorer.Chain.SmartContract do
     field(:verified_via_sourcify, :boolean)
     field(:partially_verified, :boolean)
     field(:file_path, :string)
+    field(:is_vyper_contract, :boolean)
 
     has_many(
       :decompiled_smart_contracts,
@@ -259,7 +262,8 @@ defmodule Explorer.Chain.SmartContract do
       :optimization_runs,
       :verified_via_sourcify,
       :partially_verified,
-      :file_path
+      :file_path,
+      :is_vyper_contract
     ])
     |> validate_required([:name, :compiler_version, :optimization, :contract_source_code, :abi, :address_hash])
     |> unique_constraint(:address_hash)
@@ -280,7 +284,8 @@ defmodule Explorer.Chain.SmartContract do
         :constructor_arguments,
         :verified_via_sourcify,
         :partially_verified,
-        :file_path
+        :file_path,
+        :is_vyper_contract
       ])
       |> validate_required([:name, :compiler_version, :optimization, :address_hash])
 

apps/explorer/lib/explorer/smart_contract/compiler_version.ex

@@ -0,0 +1,197 @@
+defmodule Explorer.SmartContract.CompilerVersion do
+  @moduledoc """
+  Adapter for fetching compiler versions from https://solc-bin.ethereum.org/bin/list.json.
+  """
+
+  @unsupported_solc_versions ~w(0.1.1 0.1.2)
+  @unsupported_vyper_versions ~w(v0.2.9 v0.2.10)
+
+  @doc """
+  Fetches a list of compilers from the Ethereum Solidity API.
+  """
+  @spec fetch_versions(:solc | :vyper) :: {atom, [map]}
+  def fetch_versions(compiler) do
+    case compiler do
+      :solc -> fetch_solc_versions()
+      :vyper -> fetch_vyper_versions()
+    end
+  end
+
+  defp fetch_solc_versions do
+    headers = [{"Content-Type", "application/json"}]
+
+    case HTTPoison.get(source_url(:solc), headers) do
+      {:ok, %{status_code: 200, body: body}} ->
+        {:ok, format_data(body, :solc)}
+
+      {:ok, %{status_code: _status_code, body: body}} ->
+        {:error, decode_json(body)["error"]}
+
+      {:error, %{reason: reason}} ->
+        {:error, reason}
+    end
+  end
+
+  defp fetch_vyper_versions do
+    headers = [{"Content-Type", "application/json"}]
+
+    case HTTPoison.get(source_url(:vyper), headers) do
+      {:ok, %{status_code: 200, body: body}} ->
+        {:ok, format_data(body, :vyper)}
+
+      {:ok, %{status_code: _status_code, body: body}} ->
+        {:error, decode_json(body)["error"]}
+
+      {:error, %{reason: reason}} ->
+        {:error, reason}
+    end
+  end
+
+  @spec vyper_releases_url :: String.t()
+  def vyper_releases_url do
+    "https://api.github.com/repos/vyperlang/vyper/releases"
+  end
+
+  defp format_data(json, compiler) do
+    versions =
+      case compiler do
+        :solc ->
+          json
+          |> Jason.decode!()
+          |> Map.fetch!("builds")
+          |> remove_unsupported_versions(compiler)
+          |> format_versions(compiler)
+          |> Enum.reverse()
+
+        :vyper ->
+          json
+          |> Jason.decode!()
+          |> remove_unsupported_versions(compiler)
+          |> format_versions(compiler)
+          |> Enum.sort(fn version1, version2 ->
+            versions1 = String.split(version1, ".")
+            versions2 = String.split(version2, ".")
+            major1 = versions1 |> Enum.at(0) |> parse_integer()
+            major2 = versions2 |> Enum.at(0) |> parse_integer()
+            minor1 = versions1 |> Enum.at(1) |> parse_integer()
+            minor2 = versions2 |> Enum.at(1) |> parse_integer()
+            patch1 = versions1 |> Enum.at(2) |> String.split("-") |> Enum.at(0) |> parse_integer()
+            patch2 = versions2 |> Enum.at(2) |> String.split("-") |> Enum.at(0) |> parse_integer()
+            major1 >= major2 && minor1 >= minor2 && patch1 >= patch2
+          end)
+      end
+
+    ["latest" | versions]
+  end
+
+  defp parse_integer(string) do
+    case Integer.parse(string) do
+      {number, ""} -> number
+      _ -> nil
+    end
+  end
+
+  @spec remove_unsupported_versions([String.t()], :solc | :vyper) :: [String.t()]
+  defp remove_unsupported_versions(builds, compiler) do
+    case compiler do
+      :solc ->
+        Enum.reject(builds, fn %{"version" => version} ->
+          Enum.member?(@unsupported_solc_versions, version)
+        end)
+
+      :vyper ->
+        Enum.reject(builds, fn %{"tag_name" => version} ->
+          Enum.member?(@unsupported_vyper_versions, version)
+        end)
+    end
+  end
+
+  defp format_versions(builds, compiler) do
+    case compiler do
+      :solc ->
+        Enum.map(builds, fn build ->
+          build
+          |> Map.fetch!("path")
+          |> String.replace_prefix("soljson-", "")
+          |> String.replace_suffix(".js", "")
+        end)
+
+      :vyper ->
+        Enum.map(builds, fn build ->
+          build
+          |> Map.fetch!("tag_name")
+        end)
+    end
+  end
+
+  defp decode_json(json) do
+    Jason.decode!(json)
+  end
+
+  @spec source_url(:solc | :vyper) :: String.t()
+  defp source_url(compiler) do
+    case compiler do
+      :solc ->
+        solc_bin_api_url = Application.get_env(:explorer, :solc_bin_api_url)
+        "#{solc_bin_api_url}/bin/list.json"
+
+      :vyper ->
+        vyper_releases_url()
+    end
+  end
+
+  def get_strict_compiler_version(compiler, compiler_version) do
+    case compiler do
+      :solc ->
+        if compiler_version == "latest" do
+          compiler_versions = get_compiler_versions(:solc)
+
+          if Enum.count(compiler_versions) > 1 do
+            latest_stable_version =
+              compiler_versions
+              |> Enum.drop(1)
+              |> Enum.reduce_while("", fn version, acc ->
+                if String.contains?(version, "-nightly") do
+                  {:cont, acc}
+                else
+                  {:halt, version}
+                end
+              end)
+
+            latest_stable_version
+          else
+            "latest"
+          end
+        else
+          compiler_version
+        end
+
+      :vyper ->
+        if compiler_version == "latest" do
+          compiler_versions = get_compiler_versions(:vyper)
+
+          if Enum.count(compiler_versions) > 1 do
+            latest_stable_version =
+              compiler_versions
+              |> Enum.at(1)
+
+            latest_stable_version
+          else
+            "latest"
+          end
+        else
+          compiler_version
+        end
+    end
+  end
+
+  defp get_compiler_versions(compiler) do
+    case fetch_versions(compiler) do
+      {:ok, compiler_versions} ->
+        compiler_versions
+
+      {:error, _} ->
+        []
+    end
+  end
+end

apps/explorer/lib/explorer/smart_contract/solc_downloader.ex

@@ -5,7 +5,7 @@ defmodule Explorer.SmartContract.SolcDownloader do
   """
   use GenServer
 
-  alias Explorer.SmartContract.Solidity.CompilerVersion
+  alias Explorer.SmartContract.CompilerVersion
 
   @latest_compiler_refetch_time :timer.minutes(30)
 
@@ -16,7 +16,7 @@ defmodule Explorer.SmartContract.SolcDownloader do
       path
     else
       compiler_versions =
-        case CompilerVersion.fetch_versions() do
+        case CompilerVersion.fetch_versions(:solc) do
           {:ok, compiler_versions} ->
             compiler_versions
 

apps/explorer/lib/explorer/smart_contract/solidity/compiler_version.ex

@@ -1,95 +0,0 @@
-defmodule Explorer.SmartContract.Solidity.CompilerVersion do
-  @moduledoc """
-  Adapter for fetching compiler versions from https://solc-bin.ethereum.org/bin/list.json.
-  """
-
-  @unsupported_versions ~w(0.1.1 0.1.2)
-
-  @doc """
-  Fetches a list of compilers from the Ethereum Solidity API.
-  """
-  @spec fetch_versions :: {atom, [map]}
-  def fetch_versions do
-    headers = [{"Content-Type", "application/json"}]
-
-    case HTTPoison.get(source_url(), headers) do
-      {:ok, %{status_code: 200, body: body}} ->
-        {:ok, format_data(body)}
-
-      {:ok, %{status_code: _status_code, body: body}} ->
-        {:error, decode_json(body)["error"]}
-
-      {:error, %{reason: reason}} ->
-        {:error, reason}
-    end
-  end
-
-  defp format_data(json) do
-    versions =
-      json
-      |> Jason.decode!()
-      |> Map.fetch!("builds")
-      |> remove_unsupported_versions()
-      |> format_versions()
-      |> Enum.reverse()
-
-    ["latest" | versions]
-  end
-
-  defp remove_unsupported_versions(builds) do
-    Enum.reject(builds, fn %{"version" => version} ->
-      Enum.member?(@unsupported_versions, version)
-    end)
-  end
-
-  defp format_versions(builds) do
-    Enum.map(builds, fn build ->
-      build
-      |> Map.fetch!("path")
-      |> String.replace_prefix("soljson-", "")
-      |> String.replace_suffix(".js", "")
-    end)
-  end
-
-  defp decode_json(json) do
-    Jason.decode!(json)
-  end
-
-  defp source_url do
-    solc_bin_api_url = Application.get_env(:explorer, :solc_bin_api_url)
-
-    "#{solc_bin_api_url}/bin/list.json"
-  end
-
-  def get_strict_compiler_version(compiler_version) do
-    if compiler_version == "latest" do
-      compiler_versions =
-        case fetch_versions() do
-          {:ok, compiler_versions} ->
-            compiler_versions
-
-          {:error, _} ->
-            []
-        end
-
-      if Enum.count(compiler_versions) > 1 do
-        latest_stable_version =
-          compiler_versions
-          |> Enum.drop(1)
-          |> Enum.reduce_while("", fn version, acc ->
-            if String.contains?(version, "-nightly") do
-              {:cont, acc}
-            else
-              {:halt, version}
-            end
-          end)
-
-        latest_stable_version
-      else
-        "latest"
-      end
-    else
-      compiler_version
-    end
-  end
-end

apps/explorer/lib/explorer/smart_contract/solidity/publisher.ex

@@ -1,18 +1,18 @@
-defmodule Explorer.SmartContract.Publisher do
+defmodule Explorer.SmartContract.Solidity.Publisher do
   @moduledoc """
   Module responsible to control the contract verification.
   """
 
   alias Explorer.Chain
   alias Explorer.Chain.SmartContract
-  alias Explorer.SmartContract.Solidity.CompilerVersion
+  alias Explorer.SmartContract.CompilerVersion
-  alias Explorer.SmartContract.Verifier
+  alias Explorer.SmartContract.Solidity.Verifier
 
   @doc """
   Evaluates smart contract authenticity and saves its details.
 
   ## Examples
-      Explorer.SmartContract.Publisher.publish(
+      Explorer.SmartContract.Solidity.Publisher.publish(
         "0x0f95fa9bc0383e699325f2658d04e8d96d87b90c",
         %{
           "compiler_version" => "0.4.24",
@@ -95,7 +95,7 @@ defmodule Explorer.SmartContract.Publisher do
 
     prepared_external_libraries = prepare_external_libraies(params["external_libraries"])
 
-    compiler_version = CompilerVersion.get_strict_compiler_version(params["compiler_version"])
+    compiler_version = CompilerVersion.get_strict_compiler_version(:solc, params["compiler_version"])
 
     %{
       address_hash: address_hash,
@@ -110,7 +110,8 @@ defmodule Explorer.SmartContract.Publisher do
       secondary_sources: params["secondary_sources"],
       abi: abi,
       verified_via_sourcify: params["verified_via_sourcify"],
-      partially_verified: params["partially_verified"]
+      partially_verified: params["partially_verified"],
+      is_vyper_contract: false
     }
   end
 

apps/explorer/lib/explorer/smart_contract/solidity/publisher_worker.ex

@@ -1,4 +1,4 @@
-defmodule Explorer.SmartContract.PublisherWorker do
+defmodule Explorer.SmartContract.Solidity.PublisherWorker do
   @moduledoc """
   Background smart contract verification worker.
   """
@@ -6,7 +6,7 @@ defmodule Explorer.SmartContract.PublisherWorker do
   use Que.Worker, concurrency: 5
 
   alias Explorer.Chain.Events.Publisher, as: EventsPublisher
-  alias Explorer.SmartContract.Publisher
+  alias Explorer.SmartContract.Solidity.Publisher
 
   def perform({address_hash, params, external_libraries, conn}) do
     result =

apps/explorer/lib/explorer/smart_contract/solidity/verifier.ex

@@ -1,5 +1,5 @@
 # credo:disable-for-this-file
-defmodule Explorer.SmartContract.Verifier do
+defmodule Explorer.SmartContract.Solidity.Verifier do
   @moduledoc """
   Module responsible to verify the Smart Contract.
 
@@ -107,12 +107,12 @@ defmodule Explorer.SmartContract.Verifier do
 
     blockchain_created_tx_input =
       case Chain.smart_contract_creation_tx_bytecode(address_hash) do
-        nil ->
+        %{init: init, created_contract_code: _created_contract_code} ->
-          bytecode
+          "0x" <> init_without_0x = init
+          init_without_0x
 
-        blockchain_created_tx_input_with_0x ->
+        _ ->
-          "0x" <> blockchain_created_tx_input = blockchain_created_tx_input_with_0x
+          bytecode
-          blockchain_created_tx_input
       end
 
     %{
@@ -177,6 +177,10 @@ defmodule Explorer.SmartContract.Verifier do
   For more information on the swarm hash, check out:
   https://solidity.readthedocs.io/en/v0.5.3/metadata.html#encoding-of-the-metadata-hash-in-the-bytecode
   """
+  def extract_bytecode_and_metadata_hash(nil) do
+    %{"metadata_hash" => nil, "bytecode" => nil, "compiler_version" => nil}
+  end
+
   def extract_bytecode_and_metadata_hash("0x" <> code) do
     %{"metadata_hash" => metadata_hash, "bytecode" => bytecode, "compiler_version" => compiler_version} =
       extract_bytecode_and_metadata_hash(code)

apps/explorer/lib/explorer/smart_contract/vyper/code_compiler.ex

@@ -0,0 +1,74 @@
+defmodule Explorer.SmartContract.Vyper.CodeCompiler do
+  @moduledoc """
+  Module responsible to compile the Vyper code of a given Smart Contract.
+  """
+
+  alias Explorer.SmartContract.VyperDownloader
+
+  require Logger
+
+  @spec run(Keyword.t()) :: {:ok, map} | {:error, :compilation | :name}
+  def run(params) do
+    compiler_version = Keyword.fetch!(params, :compiler_version)
+    code = Keyword.fetch!(params, :code)
+
+    path = VyperDownloader.ensure_exists(compiler_version)
+
+    source_file_path = create_source_file(code)
+
+    if path do
+      {response, _status} =
+        System.cmd(
+          path,
+          [
+            "-f",
+            "abi,bytecode",
+            source_file_path
+          ]
+        )
+
+      response_data = String.split(response, "\n")
+      abi_row = response_data |> Enum.at(0)
+      bytecode = response_data |> Enum.at(1)
+
+      case Jason.decode(abi_row) do
+        {:ok, abi} ->
+          {:ok, %{"abi" => abi, "bytecode" => bytecode}}
+
+        {:error, %Jason.DecodeError{}} ->
+          {:error, :compilation}
+      end
+    else
+      {:error, :compilation}
+    end
+  end
+
+  def get_contract_info(contracts, _) when contracts == %{}, do: {:error, :compilation}
+
+  def get_contract_info(contracts, name) do
+    new_versions_name = ":" <> name
+
+    case contracts do
+      %{^new_versions_name => response} ->
+        response
+
+      %{^name => response} ->
+        response
+
+      _ ->
+        {:error, :name}
+    end
+  end
+
+  def parse_error({:error, %{"error" => error}}), do: {:error, [error]}
+  def parse_error({:error, %{"errors" => errors}}), do: {:error, errors}
+  def parse_error({:error, _} = error), do: error
+
+  defp create_source_file(source) do
+    {:ok, path} = Briefly.create()
+
+    File.write!(path, source)
+
+    path
+  end
+end

apps/explorer/lib/explorer/smart_contract/vyper/publisher.ex

@@ -0,0 +1,69 @@
+defmodule Explorer.SmartContract.Vyper.Publisher do
+  @moduledoc """
+  Module responsible to control Vyper contract verification.
+  """
+
+  alias Explorer.Chain
+  alias Explorer.Chain.SmartContract
+  alias Explorer.SmartContract.CompilerVersion
+  alias Explorer.SmartContract.Vyper.Verifier
+
+  def publish(address_hash, params) do
+    case Verifier.evaluate_authenticity(address_hash, params) do
+      {:ok, %{abi: abi}} ->
+        publish_smart_contract(address_hash, params, abi)
+
+      {:error, error} ->
+        {:error, unverified_smart_contract(address_hash, params, error, nil)}
+    end
+  end
+
+  def publish_smart_contract(address_hash, params, abi) do
+    attrs = address_hash |> attributes(params, abi)
+
+    Chain.create_smart_contract(attrs, attrs.external_libraries, attrs.secondary_sources)
+  end
+
+  defp unverified_smart_contract(address_hash, params, error, error_message) do
+    attrs = attributes(address_hash, params)
+
+    changeset =
+      SmartContract.invalid_contract_changeset(
+        %SmartContract{address_hash: address_hash},
+        attrs,
+        error,
+        error_message
+      )
+
+    %{changeset | action: :insert}
+  end
+
+  defp attributes(address_hash, params, abi \\ %{}) do
+    constructor_arguments = params["constructor_arguments"]
+
+    clean_constructor_arguments =
+      if constructor_arguments != nil && constructor_arguments != "" do
+        constructor_arguments
+      else
+        nil
+      end
+
+    compiler_version = CompilerVersion.get_strict_compiler_version(:vyper, params["compiler_version"])
+
+    %{
+      address_hash: address_hash,
+      name: "Vyper_contract",
+      compiler_version: compiler_version,
+      evm_version: nil,
+      optimization_runs: nil,
+      optimization: false,
+      contract_source_code: params["contract_source_code"],
+      constructor_arguments: clean_constructor_arguments,
+      external_libraries: [],
+      secondary_sources: [],
+      abi: abi,
+      verified_via_sourcify: false,
+      is_vyper_contract: true
+    }
+  end
+end

apps/explorer/lib/explorer/smart_contract/vyper/publisher_worker.ex

@@ -0,0 +1,23 @@
+defmodule Explorer.SmartContract.Vyper.PublisherWorker do
+  @moduledoc """
+  Background smart contract verification worker.
+  """
+
+  use Que.Worker, concurrency: 5
+
+  alias Explorer.Chain.Events.Publisher, as: EventsPublisher
+  alias Explorer.SmartContract.Vyper.Publisher
+
+  def perform({address_hash, params, conn}) do
+    result =
+      case Publisher.publish(address_hash, params) do
+        {:ok, _contract} = result ->
+          result
+
+        {:error, changeset} ->
+          {:error, changeset}
+      end
+
+    EventsPublisher.broadcast([{:contract_verification_result, {address_hash, result, conn}}], :on_demand)
+  end
+end

apps/explorer/lib/explorer/smart_contract/vyper/verifier.ex

@@ -0,0 +1,65 @@
+# credo:disable-for-this-file
+defmodule Explorer.SmartContract.Vyper.Verifier do
+  @moduledoc """
+  Module responsible to verify the Smart Contract through Vyper.
+
+  Given a contract source code the bytecode will be generated  and matched
+  against the existing Creation Address Bytecode, if it matches the contract is
+  then Verified.
+  """
+
+  alias Explorer.Chain
+  alias Explorer.SmartContract.Vyper.CodeCompiler
+
+  def evaluate_authenticity(_, %{"name" => ""}), do: {:error, :name}
+
+  def evaluate_authenticity(_, %{"contract_source_code" => ""}),
+    do: {:error, :contract_source_code}
+
+  def evaluate_authenticity(address_hash, params) do
+    verify(address_hash, params)
+  end
+
+  defp verify(address_hash, params) do
+    contract_source_code = Map.fetch!(params, "contract_source_code")
+    compiler_version = Map.fetch!(params, "compiler_version")
+    constructor_arguments = Map.get(params, "constructor_arguments", "")
+
+    vyper_output =
+      CodeCompiler.run(
+        compiler_version: compiler_version,
+        code: contract_source_code
+      )
+
+    compare_bytecodes(
+      vyper_output,
+      address_hash,
+      constructor_arguments
+    )
+  end
+
+  defp compare_bytecodes({:error, _}, _, _), do: {:error, :compilation}
+
+  # credo:disable-for-next-line /Complexity/
+  defp compare_bytecodes(
+         {:ok, %{"abi" => abi, "bytecode" => bytecode}},
+         address_hash,
+         arguments_data
+       ) do
+    blockchain_bytecode =
+      case Chain.smart_contract_creation_tx_bytecode(address_hash) do
+        %{init: init, created_contract_code: _created_contract_code} ->
+          init
+
+        _ ->
+          nil
+      end
+      |> String.trim()
+
+    if String.trim(bytecode <> arguments_data) == blockchain_bytecode do
+      {:ok, %{abi: abi}}
+    else
+      {:error, :generated_bytecode}
+    end
+  end
+end

apps/explorer/lib/explorer/smart_contract/vyper_downloader.ex

@@ -0,0 +1,127 @@
+defmodule Explorer.SmartContract.VyperDownloader do
+  @moduledoc """
+  Checks to see if the requested Vyper compiler version exists, and if not it
+  downloads and stores the file.
+  """
+  use GenServer
+
+  alias Explorer.SmartContract.CompilerVersion
+
+  @latest_compiler_refetch_time :timer.minutes(30)
+
+  def ensure_exists(version) do
+    path = file_path(version)
+
+    if File.exists?(path) && version !== "latest" do
+      path
+    else
+      compiler_versions =
+        case CompilerVersion.fetch_versions(:vyper) do
+          {:ok, compiler_versions} ->
+            compiler_versions
+
+          {:error, _} ->
+            []
+        end
+
+      if version in compiler_versions do
+        GenServer.call(__MODULE__, {:ensure_exists, version}, 60_000)
+      else
+        false
+      end
+    end
+  end
+
+  def start_link(_) do
+    GenServer.start_link(__MODULE__, [], name: __MODULE__)
+  end
+
+  # sobelow_skip ["Traversal"]
+  @impl true
+  def init([]) do
+    File.mkdir(compiler_dir())
+
+    {:ok, []}
+  end
+
+  # sobelow_skip ["Traversal"]
+  @impl true
+  def handle_call({:ensure_exists, version}, _from, state) do
+    path = file_path(version)
+
+    if fetch?(version, path) do
+      temp_path = file_path("#{version}-tmp")
+
+      contents = download(version)
+
+      file = File.open!(temp_path, [:write, :exclusive])
+
+      IO.binwrite(file, contents)
+      File.close(file)
+
+      File.rename(temp_path, path)
+      System.cmd("chmod", ["+x", path])
+    end
+
+    {:reply, path, state}
+  end
+
+  defp fetch?("latest", path) do
+    case File.stat(path) do
+      {:error, :enoent} ->
+        true
+
+      {:ok, %{mtime: mtime}} ->
+        last_modified = NaiveDateTime.from_erl!(mtime)
+        diff = Timex.diff(NaiveDateTime.utc_now(), last_modified, :milliseconds)
+
+        diff > @latest_compiler_refetch_time
+    end
+  end
+
+  defp fetch?(_, path) do
+    not File.exists?(path)
+  end
+
+  defp file_path(version) do
+    Path.join(compiler_dir(), "#{version}")
+  end
+
+  defp compiler_dir do
+    Application.app_dir(:explorer, "priv/vyper_compilers/")
+  end
+
+  defp download(version) do
+    version = CompilerVersion.get_strict_compiler_version(:vyper, version)
+    releases_path = CompilerVersion.vyper_releases_url()
+
+    releases_body =
+      releases_path
+      |> HTTPoison.get!([], timeout: 60_000, recv_timeout: 60_000)
+      |> Map.get(:body)
+      |> Jason.decode!()
+
+    release =
+      releases_body
+      |> Enum.find(fn release ->
+        Map.get(release, "tag_name") == version
+      end)
+
+    release_assets = Map.get(release, "assets")
+
+    download_path =
+      Enum.reduce_while(release_assets, "", fn asset, acc ->
+        browser_download_url = Map.get(asset, "browser_download_url")
+
+        if browser_download_url =~ "linux" do
+          {:halt, browser_download_url}
+        else
+          {:cont, acc}
+        end
+      end)
+
+    download_path
+    |> HTTPoison.get!([], timeout: 60_000, recv_timeout: 60_000, follow_redirect: true, hackney: [force_redirect: true])
+    |> Map.get(:body)
+  end
+end

apps/explorer/priv/repo/migrations/20210616120552_smart_contracts_add_is_vyper_flag.exs

@@ -0,0 +1,9 @@
+defmodule Explorer.Repo.Migrations.SmartContractsAddIsVyperFlag do
+  use Ecto.Migration
+
+  def change do
+    alter table(:smart_contracts) do
+      add(:is_vyper_contract, :boolean, null: true)
+    end
+  end
+end

apps/explorer/test/explorer/smart_contract/compiler_version_test.exs

@@ -1,12 +1,12 @@
-defmodule Explorer.SmartContract.Solidity.CompilerVersionTest do
+defmodule Explorer.SmartContract.CompilerVersionTest do
   use ExUnit.Case
 
-  doctest Explorer.SmartContract.Solidity.CompilerVersion
+  doctest Explorer.SmartContract.CompilerVersion
 
-  alias Explorer.SmartContract.Solidity.CompilerVersion
+  alias Explorer.SmartContract.CompilerVersion
   alias Plug.Conn
 
-  describe "fetch_versions" do
+  describe "fetch_versions/1" do
     setup do
       bypass = Bypass.open()
 
@@ -23,7 +23,7 @@ defmodule Explorer.SmartContract.Solidity.CompilerVersionTest do
         Conn.resp(conn, 200, solc_bin_versions())
       end)
 
-      assert {:ok, versions} = CompilerVersion.fetch_versions()
+      assert {:ok, versions} = CompilerVersion.fetch_versions(:solc)
       assert Enum.any?(versions, fn item -> item == "v0.4.9+commit.364da425" end) == true
     end
 
@@ -35,7 +35,7 @@ defmodule Explorer.SmartContract.Solidity.CompilerVersionTest do
         Conn.resp(conn, 200, solc_bin_versions())
       end)
 
-      assert {:ok, versions} = CompilerVersion.fetch_versions()
+      assert {:ok, versions} = CompilerVersion.fetch_versions(:solc)
       assert List.first(versions) == "latest"
     end
 
@@ -44,13 +44,13 @@ defmodule Explorer.SmartContract.Solidity.CompilerVersionTest do
         Conn.resp(conn, 400, ~S({"error": "bad request"}))
       end)
 
-      assert {:error, "bad request"} = CompilerVersion.fetch_versions()
+      assert {:error, "bad request"} = CompilerVersion.fetch_versions(:solc)
     end
 
     test "returns error when there is server error", %{bypass: bypass} do
       Bypass.down(bypass)
 
-      assert {:error, :econnrefused} = CompilerVersion.fetch_versions()
+      assert {:error, :econnrefused} = CompilerVersion.fetch_versions(:solc)
     end
   end
 

apps/explorer/test/explorer/smart_contract/solidity/publisher_test.exs

@@ -1,15 +1,15 @@
-defmodule Explorer.SmartContract.PublisherTest do
+defmodule Explorer.SmartContract.Solidity.PublisherTest do
   use ExUnit.Case, async: true
 
   use Explorer.DataCase
 
-  doctest Explorer.SmartContract.Publisher
+  doctest Explorer.SmartContract.Solidity.Publisher
 
   @moduletag timeout: :infinity
 
   alias Explorer.Chain.{ContractMethod, SmartContract}
   alias Explorer.{Factory, Repo}
-  alias Explorer.SmartContract.Publisher
+  alias Explorer.SmartContract.Solidity.Publisher
 
   describe "publish/2" do
     test "with valid data creates a smart_contract" do
@@ -86,7 +86,7 @@ defmodule Explorer.SmartContract.PublisherTest do
       }
 
       response = Publisher.publish(contract_address.hash, valid_attrs)
-      assert {:ok, %SmartContract{} = smart_contract} = response
+      assert {:ok, %SmartContract{} = _smart_contract} = response
 
       Enum.each(contract_code_info.abi, fn selector ->
         [parsed] = ABI.parse_specification([selector])
@@ -174,7 +174,7 @@ defmodule Explorer.SmartContract.PublisherTest do
         end)
 
       response = Publisher.publish(contract_address.hash, params, external_libraries_form_params)
-      assert {:ok, %SmartContract{} = smart_contract} = response
+      assert {:ok, %SmartContract{} = _smart_contract} = response
     end
   end
 end

apps/explorer/test/explorer/smart_contract/solidity/verifier_test.exs

@@ -1,12 +1,12 @@
-defmodule Explorer.SmartContract.VerifierTest do
+defmodule Explorer.SmartContract.Solidity.VerifierTest do
   use ExUnit.Case, async: true
   use Explorer.DataCase
 
   @moduletag timeout: :infinity
 
-  doctest Explorer.SmartContract.Verifier
+  doctest Explorer.SmartContract.Solidity.Verifier
 
-  alias Explorer.SmartContract.Verifier
+  alias Explorer.SmartContract.Solidity.Verifier
   alias Explorer.Factory
 
   @code_0_4 """

docker/Dockerfile

@@ -2,6 +2,17 @@ FROM bitwalker/alpine-elixir-phoenix:1.12
 
 RUN apk --no-cache --update add alpine-sdk gmp-dev automake libtool inotify-tools autoconf python3 file
 
+ENV GLIBC_REPO=https://github.com/sgerrand/alpine-pkg-glibc
+ENV GLIBC_VERSION=2.30-r0
+
+RUN set -ex && \
+    apk --update add libstdc++ curl ca-certificates && \
+    for pkg in glibc-${GLIBC_VERSION} glibc-bin-${GLIBC_VERSION}; \
+        do curl -sSL ${GLIBC_REPO}/releases/download/${GLIBC_VERSION}/${pkg}.apk -o /tmp/${pkg}.apk; done && \
+    apk add --allow-untrusted /tmp/*.apk && \
+    rm -v /tmp/*.apk && \
+    /usr/glibc-compat/sbin/ldconfig /lib /usr/glibc-compat/lib
+
 # Get Rust
 RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y