return not found for not verified contract for token read_contract

apps/block_scout_web/lib/block_scout_web/controllers/tokens/read_contract_controller.ex

@@ -7,6 +7,7 @@ defmodule BlockScoutWeb.Tokens.ReadContractController do
     options = [necessity_by_association: %{[contract_address: :smart_contract] => :optional}]
 
     with {:ok, address_hash} <- Chain.string_to_address_hash(address_hash_string),
+         :ok <- Chain.check_verified_smart_contract_exists(address_hash),
          {:ok, token} <- Chain.token_from_address_hash(address_hash, options) do
       render(
         conn,
@@ -15,6 +16,9 @@ defmodule BlockScoutWeb.Tokens.ReadContractController do
         counters_path: token_path(conn, :token_counters, %{"id" => to_string(address_hash)})
       )
     else
+      :not_found ->
+        not_found(conn)
+
       :error ->
         not_found(conn)
 

apps/block_scout_web/test/block_scout_web/controllers/tokens/read_contract_controller_test.exs

@@ -8,9 +8,34 @@ defmodule BlockScoutWeb.Tokens.ReadContractControllerTest do
       assert html_response(conn, 404)
     end
 
+    test "with unverified address hash returns not found", %{conn: conn} do
+      address = insert(:address)
+
+      token = insert(:token, contract_address: address)
+
+      transaction =
+        :transaction
+        |> insert()
+        |> with_block()
+
+      insert(
+        :token_transfer,
+        to_address: build(:address),
+        transaction: transaction,
+        token_contract_address: address,
+        token: token
+      )
+
+      conn = get(conn, token_read_contract_path(BlockScoutWeb.Endpoint, :index, token.contract_address_hash))
+
+      assert html_response(conn, 404)
+    end
+
     test "successfully renders the page when the token is a verified smart contract", %{conn: conn} do
       token_contract_address = insert(:contract_address)
 
+      insert(:smart_contract, address_hash: token_contract_address.hash)
+
       token = insert(:token, contract_address: token_contract_address)
 
       transaction =