From ced4a20ee95ec5d40c6d96c6fb055136e681bd3f Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Wed, 27 Mar 2019 16:53:17 +0300
Subject: [PATCH 01/28] allow specifying number of optimization runs

---
 .../address_contract_verification_controller.ex   | 15 +++++++++++++--
 .../address_contract_verification/new.html.eex    |  5 +++++
 .../smart_contract/solidity/code_compiler.ex      | 10 +++++++++-
 .../lib/explorer/smart_contract/verifier.ex       | 11 ++++++++++-
 4 files changed, 37 insertions(+), 4 deletions(-)

diff --git a/apps/block_scout_web/lib/block_scout_web/controllers/address_contract_verification_controller.ex b/apps/block_scout_web/lib/block_scout_web/controllers/address_contract_verification_controller.ex
index 75cda8c965..8f35dcaa86 100644
--- a/apps/block_scout_web/lib/block_scout_web/controllers/address_contract_verification_controller.ex
+++ b/apps/block_scout_web/lib/block_scout_web/controllers/address_contract_verification_controller.ex
@@ -26,10 +26,14 @@ defmodule BlockScoutWeb.AddressContractVerificationController do
           "address_id" => address_hash_string,
           "smart_contract" => smart_contract,
           "external_libraries" => external_libraries,
-          "evm_version" => evm_version
+          "evm_version" => evm_version,
+          "optimization" => optimization
         }
       ) do
-    smart_sontact_with_evm_version = Map.put(smart_contract, "evm_version", evm_version["evm_version"])
+    smart_sontact_with_evm_version =
+      smart_contract
+      |> Map.put("evm_version", evm_version["evm_version"])
+      |> Map.put("optimization_runs", parse_optimization_runs(optimization))
 
     case Publisher.publish(address_hash_string, smart_sontact_with_evm_version, external_libraries) do
       {:ok, _smart_contract} ->
@@ -45,4 +49,11 @@ defmodule BlockScoutWeb.AddressContractVerificationController do
         )
     end
   end
+
+  def parse_optimization_runs(%{"runs" => runs}) do
+    case Integer.parse(runs) do
+      {integer, ""} -> integer
+      _ -> 200
+    end
+  end
 end
diff --git a/apps/block_scout_web/lib/block_scout_web/templates/address_contract_verification/new.html.eex b/apps/block_scout_web/lib/block_scout_web/templates/address_contract_verification/new.html.eex
index ff0aec3423..e2969905cc 100644
--- a/apps/block_scout_web/lib/block_scout_web/templates/address_contract_verification/new.html.eex
+++ b/apps/block_scout_web/lib/block_scout_web/templates/address_contract_verification/new.html.eex
@@ -48,6 +48,11 @@
           <%= error_tag f, :optimization, id: "optimization-help-block", class: "text-danger" %>
         </div>
 
+        <div class="form-group">
+          <%= label f, :name, gettext("Optimization runs") %>
+          <%= text_input :optimization, :runs, value: 200, class: "form-control", "aria-describedby": "optimization-runs-help-block", "data-test": "optimization-runs" %>
+        </div>
+
         <div class="form-group mb-4">
           <%= label f, :contract_source_code, gettext("Enter the Solidity Contract Code below") %>
           <%= textarea f, :contract_source_code, class: "form-control monospace", rows: 3, "aria-describedby": "contract-source-code-help-block" %>
diff --git a/apps/explorer/lib/explorer/smart_contract/solidity/code_compiler.ex b/apps/explorer/lib/explorer/smart_contract/solidity/code_compiler.ex
index 2eab371445..9070a69eae 100644
--- a/apps/explorer/lib/explorer/smart_contract/solidity/code_compiler.ex
+++ b/apps/explorer/lib/explorer/smart_contract/solidity/code_compiler.ex
@@ -61,7 +61,15 @@ defmodule Explorer.SmartContract.Solidity.CodeCompiler do
         }
       }
   """
-  def run(name, compiler_version, code, optimize, evm_version \\ "byzantium", external_libs \\ %{}) do
+  def run(
+        name: name,
+        compiler_version: compiler_version,
+        code: code,
+        optimize: optimize,
+        optimization_runs: _optimization_runs,
+        evm_version: evm_version,
+        external_libs: external_libs
+      ) do
     external_libs_string = Jason.encode!(external_libs)
 
     evm_version =
diff --git a/apps/explorer/lib/explorer/smart_contract/verifier.ex b/apps/explorer/lib/explorer/smart_contract/verifier.ex
index 1e348bfd12..97c7f8c757 100644
--- a/apps/explorer/lib/explorer/smart_contract/verifier.ex
+++ b/apps/explorer/lib/explorer/smart_contract/verifier.ex
@@ -24,9 +24,18 @@ defmodule Explorer.SmartContract.Verifier do
     external_libraries = Map.get(params, "external_libraries", %{})
     constructor_arguments = Map.get(params, "constructor_arguments", "")
     evm_version = Map.get(params, "evm_version", "byzantium")
+    optimization_runs = Map.get(params, "optimization_runs", 200)
 
     solc_output =
-      CodeCompiler.run(name, compiler_version, contract_source_code, optimization, evm_version, external_libraries)
+      CodeCompiler.run(
+        name: name,
+        compiler_version: compiler_version,
+        code: contract_source_code,
+        optimize: optimization,
+        optimization_runs: optimization_runs,
+        evm_version: evm_version,
+        external_libs: external_libraries
+      )
 
     compare_bytecodes(solc_output, address_hash, constructor_arguments)
   end

From 025cc0a9b7948efa1257d8c6204bcae40101ce6a Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Thu, 28 Mar 2019 11:38:00 +0300
Subject: [PATCH 02/28] fix named arguments in code compiler

---
 .../smart_contract/solidity/code_compiler.ex  | 30 ++++++------
 .../solidity/code_compiler_test.exs           | 49 +++++++++++--------
 2 files changed, 44 insertions(+), 35 deletions(-)

diff --git a/apps/explorer/lib/explorer/smart_contract/solidity/code_compiler.ex b/apps/explorer/lib/explorer/smart_contract/solidity/code_compiler.ex
index 9070a69eae..e81a83c549 100644
--- a/apps/explorer/lib/explorer/smart_contract/solidity/code_compiler.ex
+++ b/apps/explorer/lib/explorer/smart_contract/solidity/code_compiler.ex
@@ -13,10 +13,10 @@ defmodule Explorer.SmartContract.Solidity.CodeCompiler do
 
   ## Examples
 
-      iex(1)> Explorer.SmartContract.Solidity.CodeCompiler.run(
-      ...>      "SimpleStorage",
-      ...>      "v0.4.24+commit.e67f0147",
-      ...>      \"""
+      iex(1)> Explorer.SmartContract.Solidity.CodeCompiler.run([
+      ...>      name: "SimpleStorage",
+      ...>      compiler_version: "v0.4.24+commit.e67f0147",
+      ...>      code: \"""
       ...>      pragma solidity ^0.4.24;
       ...>
       ...>      contract SimpleStorage {
@@ -31,8 +31,8 @@ defmodule Explorer.SmartContract.Solidity.CodeCompiler do
       ...>          }
       ...>      }
       ...>      \""",
-      ...>      false
-      ...>  )
+      ...>      optimize: false, evm_version: "byzantium"
+      ...>  ])
       {
         :ok,
         %{
@@ -61,15 +61,15 @@ defmodule Explorer.SmartContract.Solidity.CodeCompiler do
         }
       }
   """
-  def run(
-        name: name,
-        compiler_version: compiler_version,
-        code: code,
-        optimize: optimize,
-        optimization_runs: _optimization_runs,
-        evm_version: evm_version,
-        external_libs: external_libs
-      ) do
+  def run(params) do
+    name = Keyword.fetch!(params, :name)
+    compiler_version = Keyword.fetch!(params, :compiler_version)
+    code = Keyword.fetch!(params, :code)
+    optimize = Keyword.fetch!(params, :optimize)
+    _optimization_runs = Keyword.get(params, :optimization_runs, 200)
+    evm_version = Keyword.get(params, :evm_version, List.last(@allowed_evm_versions))
+    external_libs = Keyword.get(params, :external_libs, %{})
+
     external_libs_string = Jason.encode!(external_libs)
 
     evm_version =
diff --git a/apps/explorer/test/explorer/smart_contract/solidity/code_compiler_test.exs b/apps/explorer/test/explorer/smart_contract/solidity/code_compiler_test.exs
index ebf13a4d41..79bbb62f70 100644
--- a/apps/explorer/test/explorer/smart_contract/solidity/code_compiler_test.exs
+++ b/apps/explorer/test/explorer/smart_contract/solidity/code_compiler_test.exs
@@ -18,10 +18,11 @@ defmodule Explorer.SmartContract.Solidity.CodeCompilerTest do
     test "compiles the latest solidity version", %{contract_code_info: contract_code_info} do
       response =
         CodeCompiler.run(
-          contract_code_info.name,
-          contract_code_info.version,
-          contract_code_info.source_code,
-          contract_code_info.optimized
+          name: contract_code_info.name,
+          compiler_version: contract_code_info.version,
+          code: contract_code_info.source_code,
+          optimize: contract_code_info.optimized,
+          evm_version: "byzantium"
         )
 
       assert {:ok,
@@ -37,10 +38,11 @@ defmodule Explorer.SmartContract.Solidity.CodeCompilerTest do
 
       response =
         CodeCompiler.run(
-          contract_code_info.name,
-          contract_code_info.version,
-          contract_code_info.source_code,
-          optimize
+          name: contract_code_info.name,
+          compiler_version: contract_code_info.version,
+          code: contract_code_info.source_code,
+          optimize: optimize,
+          evm_version: "byzantium"
         )
 
       assert {:ok,
@@ -61,12 +63,12 @@ defmodule Explorer.SmartContract.Solidity.CodeCompilerTest do
 
         {:ok, result} =
           CodeCompiler.run(
-            name,
-            compiler_version,
-            contract,
-            optimize,
-            "byzantium",
-            external_libraries
+            name: name,
+            compiler_version: compiler_version,
+            code: contract,
+            optimize: optimize,
+            evm_version: "byzantium",
+            external_libs: external_libraries
           )
 
         clean_result = remove_init_data_and_whisper_data(result["bytecode"])
@@ -109,7 +111,14 @@ defmodule Explorer.SmartContract.Solidity.CodeCompilerTest do
 
       evm_version = "constantinople"
 
-      response = CodeCompiler.run(name, version, code, optimize, evm_version)
+      response =
+        CodeCompiler.run(
+          name: name,
+          compiler_version: version,
+          code: code,
+          optimize: optimize,
+          evm_version: evm_version
+        )
 
       assert {:ok,
               %{
@@ -139,7 +148,7 @@ defmodule Explorer.SmartContract.Solidity.CodeCompilerTest do
 
       version = "v0.1.3-nightly.2015.9.25+commit.4457170"
 
-      response = CodeCompiler.run(name, version, code, optimize)
+      response = CodeCompiler.run(name: name, compiler_version: version, code: code, optimize: optimize)
 
       assert {:ok,
               %{
@@ -156,10 +165,10 @@ defmodule Explorer.SmartContract.Solidity.CodeCompilerTest do
 
       response =
         CodeCompiler.run(
-          contract_code_info.name,
-          contract_code_info.version,
-          wrong_code,
-          contract_code_info.optimized
+          name: contract_code_info.name,
+          compiler_version: contract_code_info.version,
+          code: wrong_code,
+          optimize: contract_code_info.optimized
         )
 
       assert {:error, :compilation} = response

From f343fdd5939bd1b26fd519149ffacb1145c8d30c Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Thu, 28 Mar 2019 11:48:20 +0300
Subject: [PATCH 03/28] fix gettext and credo

---
 apps/block_scout_web/priv/gettext/default.pot | 39 ++++++++-------
 .../priv/gettext/en/LC_MESSAGES/default.po    | 49 ++++++++++---------
 .../smart_contract/solidity/code_compiler.ex  |  4 +-
 3 files changed, 51 insertions(+), 41 deletions(-)

diff --git a/apps/block_scout_web/priv/gettext/default.pot b/apps/block_scout_web/priv/gettext/default.pot
index 7e163ab9b3..af5d9ebfe2 100644
--- a/apps/block_scout_web/priv/gettext/default.pot
+++ b/apps/block_scout_web/priv/gettext/default.pot
@@ -197,7 +197,7 @@ msgid "Blocks Validated"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:130
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:135
 #: lib/block_scout_web/templates/api_docs/_action_tile.html.eex:24
 msgid "Cancel"
 msgstr ""
@@ -367,7 +367,7 @@ msgid "ETH"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:52
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:57
 msgid "Enter the Solidity Contract Code below"
 msgstr ""
 
@@ -713,7 +713,7 @@ msgid "Request URL"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:128
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:133
 msgid "Reset"
 msgstr ""
 
@@ -1024,7 +1024,7 @@ msgid "Verify & Publish"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:127
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:132
 msgid "Verify & publish"
 msgstr ""
 
@@ -1165,7 +1165,7 @@ msgid "Loading..."
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:125
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:130
 msgid "Loading...."
 msgstr ""
 
@@ -1582,57 +1582,57 @@ msgid "Genesis Block"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:71
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:76
 msgid "1 Library Address"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:66
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:71
 msgid "1 Library Name"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:81
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:86
 msgid "2 Library Address"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:76
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:81
 msgid "2 Library Name"
 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:96
 msgid "3 Library Address"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:86
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:91
 msgid "3 Library Name"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:101
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:106
 msgid "4 Library Address"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:96
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:101
 msgid "4 Library Name"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:111
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:116
 msgid "5 Library Address"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:106
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:111
 msgid "5 Library Name"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:63
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:68
 msgid "Contract Libraries"
 msgstr ""
 
@@ -1698,6 +1698,11 @@ msgid "EVM Version"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:58
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:63
 msgid "Enter constructor arguments if the contract had any"
 msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:52
+msgid "Optimization runs"
+msgstr ""
diff --git a/apps/block_scout_web/priv/gettext/en/LC_MESSAGES/default.po b/apps/block_scout_web/priv/gettext/en/LC_MESSAGES/default.po
index 96707da7de..cb2a5a1b19 100644
--- a/apps/block_scout_web/priv/gettext/en/LC_MESSAGES/default.po
+++ b/apps/block_scout_web/priv/gettext/en/LC_MESSAGES/default.po
@@ -197,7 +197,7 @@ msgid "Blocks Validated"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:130
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:135
 #: lib/block_scout_web/templates/api_docs/_action_tile.html.eex:24
 msgid "Cancel"
 msgstr ""
@@ -367,7 +367,7 @@ msgid "ETH"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:52
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:57
 msgid "Enter the Solidity Contract Code below"
 msgstr ""
 
@@ -713,7 +713,7 @@ msgid "Request URL"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:128
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:133
 msgid "Reset"
 msgstr ""
 
@@ -1024,7 +1024,7 @@ msgid "Verify & Publish"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:127
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:132
 msgid "Verify & publish"
 msgstr ""
 
@@ -1165,7 +1165,7 @@ msgid "Loading..."
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:125
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:130
 msgid "Loading...."
 msgstr ""
 
@@ -1582,65 +1582,60 @@ msgid "Genesis Block"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:71
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:76
 msgid "1 Library Address"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:66
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:71
 msgid "1 Library Name"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:81
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:86
 msgid "2 Library Address"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:76
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:81
 msgid "2 Library Name"
 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:96
 msgid "3 Library Address"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:86
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:91
 msgid "3 Library Name"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:101
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:106
 msgid "4 Library Address"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:96
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:101
 msgid "4 Library Name"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:111
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:116
 msgid "5 Library Address"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:106
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:111
 msgid "5 Library Name"
 msgstr ""
 
 #, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:63
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:68
 msgid "Contract Libraries"
 msgstr ""
 
-#, elixir-format
-#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:58
-msgid "Enter contructor arguments if the contract had any"
-msgstr ""
-
 #, elixir-format
 #: lib/block_scout_web/templates/address/overview.html.eex:52
 msgid "Last Balance Update: Block #"
@@ -1697,7 +1692,17 @@ msgstr ""
 msgid "Search by address, token symbol name, transaction hash, or block number"
 msgstr ""
 
-#, elixir-format, fuzzy
+#, elixir-format
 #: lib/block_scout_web/templates/address_contract_verification/new.html.eex:31
 msgid "EVM Version"
 msgstr ""
+
+#, elixir-format, fuzzy
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:63
+msgid "Enter constructor arguments if the contract had any"
+msgstr ""
+
+#, elixir-format, fuzzy
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:52
+msgid "Optimization runs"
+msgstr ""
diff --git a/apps/explorer/lib/explorer/smart_contract/solidity/code_compiler.ex b/apps/explorer/lib/explorer/smart_contract/solidity/code_compiler.ex
index e81a83c549..6127053585 100644
--- a/apps/explorer/lib/explorer/smart_contract/solidity/code_compiler.ex
+++ b/apps/explorer/lib/explorer/smart_contract/solidity/code_compiler.ex
@@ -72,7 +72,7 @@ defmodule Explorer.SmartContract.Solidity.CodeCompiler do
 
     external_libs_string = Jason.encode!(external_libs)
 
-    evm_version =
+    checked_evm_version =
       if evm_version in @allowed_evm_versions do
         evm_version
       else
@@ -89,7 +89,7 @@ defmodule Explorer.SmartContract.Solidity.CodeCompiler do
           optimize_value(optimize),
           @new_contract_name,
           external_libs_string,
-          evm_version
+          checked_evm_version
         ]
       )
 

From b60ca17fffe25e271bdecf0d5f3597f4fb0d1717 Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Thu, 28 Mar 2019 12:20:31 +0300
Subject: [PATCH 04/28] pass optimization runz parameter to javascript

---
 .../explorer/smart_contract/solidity/code_compiler.ex    | 3 ++-
 apps/explorer/priv/compile_solc.js                       | 9 +++++----
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/apps/explorer/lib/explorer/smart_contract/solidity/code_compiler.ex b/apps/explorer/lib/explorer/smart_contract/solidity/code_compiler.ex
index 6127053585..e7f6090707 100644
--- a/apps/explorer/lib/explorer/smart_contract/solidity/code_compiler.ex
+++ b/apps/explorer/lib/explorer/smart_contract/solidity/code_compiler.ex
@@ -66,7 +66,7 @@ defmodule Explorer.SmartContract.Solidity.CodeCompiler do
     compiler_version = Keyword.fetch!(params, :compiler_version)
     code = Keyword.fetch!(params, :code)
     optimize = Keyword.fetch!(params, :optimize)
-    _optimization_runs = Keyword.get(params, :optimization_runs, 200)
+    optimization_runs = params |> Keyword.get(:optimization_runs, 200) |> Integer.to_string()
     evm_version = Keyword.get(params, :evm_version, List.last(@allowed_evm_versions))
     external_libs = Keyword.get(params, :external_libs, %{})
 
@@ -87,6 +87,7 @@ defmodule Explorer.SmartContract.Solidity.CodeCompiler do
           code,
           compiler_version,
           optimize_value(optimize),
+          optimization_runs,
           @new_contract_name,
           external_libs_string,
           checked_evm_version
diff --git a/apps/explorer/priv/compile_solc.js b/apps/explorer/priv/compile_solc.js
index 2ed0ff2664..6e9489d433 100755
--- a/apps/explorer/priv/compile_solc.js
+++ b/apps/explorer/priv/compile_solc.js
@@ -5,9 +5,10 @@ const solc = require('solc');
 var sourceCode = process.argv[2];
 var version = process.argv[3];
 var optimize = process.argv[4];
-var newContractName = process.argv[5];
-var externalLibraries = JSON.parse(process.argv[6])
-var evmVersion = process.argv[7]
+var optimizationRuns = parseInt(process.argv[5], 10);
+var newContractName = process.argv[6];
+var externalLibraries = JSON.parse(process.argv[7])
+var evmVersion = process.argv[8];
 
 var compiled_code = solc.loadRemoteVersion(version, function (err, solcSnapshot) {
   if (err) {
@@ -24,7 +25,7 @@ var compiled_code = solc.loadRemoteVersion(version, function (err, solcSnapshot)
         evmVersion: evmVersion,
         optimizer: {
           enabled: optimize == '1',
-          runs: 200
+          runs: optimizationRuns
         },
         libraries: {
           [newContractName]: externalLibraries

From e199107ca247a7e3262fa0f1844e7b4f92866a2c Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Thu, 28 Mar 2019 12:33:24 +0300
Subject: [PATCH 05/28] add CHANGELOG entry

---
 CHANGELOG.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index b04b7e809c..de8ed86ee4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ### Features
 
+ - [#1662](https://github.com/poanetwork/blockscout/pull/1662) - allow specifying number of optimization runs
+
 ### Fixes
 
 ### Chore

From 979bf648070d5f7adec860dbc3c8662b73875329 Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Thu, 28 Mar 2019 14:40:45 +0300
Subject: [PATCH 06/28] use postgres stats as fallback

---
 apps/explorer/lib/explorer/chain.ex | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/apps/explorer/lib/explorer/chain.ex b/apps/explorer/lib/explorer/chain.ex
index 4ff5d7abf1..b3353996e9 100644
--- a/apps/explorer/lib/explorer/chain.ex
+++ b/apps/explorer/lib/explorer/chain.ex
@@ -20,6 +20,7 @@ defmodule Explorer.Chain do
 
   import EthereumJSONRPC, only: [integer_to_quantity: 1]
 
+  alias Ecto.Adapters.SQL
   alias Ecto.{Changeset, Multi}
 
   alias Explorer.Chain.{
@@ -1868,7 +1869,16 @@ defmodule Explorer.Chain do
   """
   @spec transaction_estimated_count() :: non_neg_integer()
   def transaction_estimated_count do
-    TransactionCountCache.value()
+    cached_value = TransactionCountCache.value()
+
+    if cached_value == 0 do
+      %Postgrex.Result{rows: [[rows]]} =
+        SQL.query!(Repo, "SELECT reltuples::BIGINT AS estimate FROM pg_class WHERE relname='transactions'")
+
+      rows
+    else
+      cached_value
+    end
   end
 
   @doc """

From 1d38f507bad348f32e38747b3032f7889e505869 Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Fri, 29 Mar 2019 10:20:41 +0300
Subject: [PATCH 07/28] use nil as a default value for transaction cache

---
 apps/explorer/lib/explorer/chain.ex                             | 2 +-
 apps/explorer/lib/explorer/chain/transaction_count_cache.ex     | 2 +-
 .../test/explorer/chain/transaction_count_cache_test.exs        | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/apps/explorer/lib/explorer/chain.ex b/apps/explorer/lib/explorer/chain.ex
index b3353996e9..b228f9f6f4 100644
--- a/apps/explorer/lib/explorer/chain.ex
+++ b/apps/explorer/lib/explorer/chain.ex
@@ -1871,7 +1871,7 @@ defmodule Explorer.Chain do
   def transaction_estimated_count do
     cached_value = TransactionCountCache.value()
 
-    if cached_value == 0 do
+    if is_nil(cached_value) do
       %Postgrex.Result{rows: [[rows]]} =
         SQL.query!(Repo, "SELECT reltuples::BIGINT AS estimate FROM pg_class WHERE relname='transactions'")
 
diff --git a/apps/explorer/lib/explorer/chain/transaction_count_cache.ex b/apps/explorer/lib/explorer/chain/transaction_count_cache.ex
index 60ecc05285..5e441734c2 100644
--- a/apps/explorer/lib/explorer/chain/transaction_count_cache.ex
+++ b/apps/explorer/lib/explorer/chain/transaction_count_cache.ex
@@ -12,7 +12,7 @@ defmodule Explorer.Chain.TransactionCountCache do
 
   # 2 hours
   @cache_period 1_000 * 60 * 60 * 2
-  @default_value 0
+  @default_value nil
   @key "count"
   @name __MODULE__
 
diff --git a/apps/explorer/test/explorer/chain/transaction_count_cache_test.exs b/apps/explorer/test/explorer/chain/transaction_count_cache_test.exs
index 8ddcda2f04..a1b0d72485 100644
--- a/apps/explorer/test/explorer/chain/transaction_count_cache_test.exs
+++ b/apps/explorer/test/explorer/chain/transaction_count_cache_test.exs
@@ -8,7 +8,7 @@ defmodule Explorer.Chain.TransactionCountCacheTest do
 
     result = TransactionCountCache.value(TestCache)
 
-    assert result == 0
+    assert is_nil(result)
   end
 
   test "updates cache if initial value is zero" do

From 111a2bf6359ca233e1ae3b9196d4f106559d7407 Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Mon, 1 Apr 2019 11:56:04 +0300
Subject: [PATCH 08/28] do not fail if failure reason is atom

---
 apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/contract.ex | 1 +
 1 file changed, 1 insertion(+)

diff --git a/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/contract.ex b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/contract.ex
index 57010769c0..c372c0c979 100644
--- a/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/contract.ex
+++ b/apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/contract.ex
@@ -46,6 +46,7 @@ defmodule EthereumJSONRPC.Contract do
       |> case do
         {:ok, responses} -> responses
         {:error, {:bad_gateway, _request_url}} -> raise "Bad gateway"
+        {:error, reason} when is_atom(reason) -> raise Atom.to_string(reason)
         {:error, error} -> raise error
       end
       |> Enum.into(%{}, &{&1.id, &1})

From 11a288120f42b2d1bc6abb4f734cad1e6394f154 Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Mon, 1 Apr 2019 15:48:22 +0300
Subject: [PATCH 09/28] decrease token metadata update interval

---
 apps/indexer/config/config.exs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/apps/indexer/config/config.exs b/apps/indexer/config/config.exs
index 9f9a34c18e..e95f3f421c 100644
--- a/apps/indexer/config/config.exs
+++ b/apps/indexer/config/config.exs
@@ -31,7 +31,7 @@ block_transformer =
 config :indexer,
   block_transformer: block_transformer,
   ecto_repos: [Explorer.Repo],
-  metadata_updater_days_interval: 7,
+  metadata_updater_days_interval: 2,
   # bytes
   memory_limit: 1 <<< 30,
   first_block: System.get_env("FIRST_BLOCK") || 0

From 2dacb921b6dff85a3726ea1bbbea5fb7827311b4 Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Mon, 1 Apr 2019 16:08:28 +0300
Subject: [PATCH 10/28] add CHANGELOG entry

---
 CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7c748863ff..76283b8bdc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 ### Fixes
 
  - [#1669](https://github.com/poanetwork/blockscout/pull/1669) - do not fail if multiple matching tokens are found
+ - [#1688](https://github.com/poanetwork/blockscout/pull/1688) - do not fail if failure reason is atom
 
 ### Chore
 

From 8d083f5415948022e0cdac8bf8570829f8f71ec7 Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Mon, 1 Apr 2019 16:30:22 +0300
Subject: [PATCH 11/28] update metadata in controller

---
 .../controllers/tokens/holder_controller.ex       | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/apps/block_scout_web/lib/block_scout_web/controllers/tokens/holder_controller.ex b/apps/block_scout_web/lib/block_scout_web/controllers/tokens/holder_controller.ex
index 27849eb7ad..665a711107 100644
--- a/apps/block_scout_web/lib/block_scout_web/controllers/tokens/holder_controller.ex
+++ b/apps/block_scout_web/lib/block_scout_web/controllers/tokens/holder_controller.ex
@@ -3,6 +3,7 @@ defmodule BlockScoutWeb.Tokens.HolderController do
 
   alias BlockScoutWeb.Tokens.HolderView
   alias Explorer.{Chain, Market}
+  alias Indexer.Token.MetadataUpdater
   alias Phoenix.View
 
   import BlockScoutWeb.Chain,
@@ -18,6 +19,8 @@ defmodule BlockScoutWeb.Tokens.HolderController do
          token_balances <- Chain.fetch_token_holders_from_token_hash(address_hash, paging_options(params)) do
       {token_balances_paginated, next_page} = split_list_by_page(token_balances)
 
+      check_if_percentage_is_correct(token_balances, token)
+
       next_page_path =
         case next_page_params(next_page, token_balances_paginated, params) do
           nil ->
@@ -61,4 +64,16 @@ defmodule BlockScoutWeb.Tokens.HolderController do
         not_found(conn)
     end
   end
+
+  defp check_if_percentage_is_correct(token_balances, token) do
+    value_from_balances =
+      Enum.reduce(token_balances, Decimal.new(0), fn balance, acc ->
+        Decimal.add(balance.value, acc)
+      end)
+
+    if !(Decimal.cmp(token.total_supply, value_from_balances) == :eq ||
+           Decimal.cmp(token.total_supply, value_from_balances) == :gt) do
+      Task.start(MetadataUpdater, :update_metadata, [token])
+    end
+  end
 end

From 71df0fccb6098645302072f6b0cbb2400be93df1 Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Mon, 1 Apr 2019 16:34:29 +0300
Subject: [PATCH 12/28] add CHANGELOG entry

---
 CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7c748863ff..0cdf7e4220 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 ### Fixes
 
  - [#1669](https://github.com/poanetwork/blockscout/pull/1669) - do not fail if multiple matching tokens are found
+ - [#1691](https://github.com/poanetwork/blockscout/pull/1691) - decrease token metadata update interval and fetch metadata in controller
 
 ### Chore
 

From 287638326f53f5f45d3dc6da0f132b828d7869d8 Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Mon, 1 Apr 2019 21:24:50 +0300
Subject: [PATCH 13/28] exclude decompiled smart contract from encoding

---
 apps/explorer/lib/explorer/chain/address.ex | 1 +
 1 file changed, 1 insertion(+)

diff --git a/apps/explorer/lib/explorer/chain/address.ex b/apps/explorer/lib/explorer/chain/address.ex
index d4c341c7db..7fd71d6af6 100644
--- a/apps/explorer/lib/explorer/chain/address.ex
+++ b/apps/explorer/lib/explorer/chain/address.ex
@@ -62,6 +62,7 @@ defmodule Explorer.Chain.Address do
            except: [
              :__meta__,
              :smart_contract,
+             :decompiled_smart_contract,
              :token,
              :contracts_creation_internal_transaction,
              :contracts_creation_transaction,

From e035877eaab0d909e78e3117ea71c12ef74f2d13 Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Tue, 2 Apr 2019 10:28:35 +0300
Subject: [PATCH 14/28] add CHANGELOG entry

---
 CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 76283b8bdc..c896f17374 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@
 
  - [#1669](https://github.com/poanetwork/blockscout/pull/1669) - do not fail if multiple matching tokens are found
  - [#1688](https://github.com/poanetwork/blockscout/pull/1688) - do not fail if failure reason is atom
+ - [#1692](https://github.com/poanetwork/blockscout/pull/1692) - exclude decompiled smart contract from encoding
 
 ### Chore
 

From e5f4ba9b8ea02567910cddb5a4db820131f0338b Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Tue, 2 Apr 2019 11:31:35 +0300
Subject: [PATCH 15/28] update tokens in fetcher

---
 .../controllers/tokens/holder_controller.ex        | 14 --------------
 apps/indexer/lib/indexer/block/fetcher.ex          |  1 +
 apps/indexer/lib/indexer/token/fetcher.ex          |  5 +----
 3 files changed, 2 insertions(+), 18 deletions(-)

diff --git a/apps/block_scout_web/lib/block_scout_web/controllers/tokens/holder_controller.ex b/apps/block_scout_web/lib/block_scout_web/controllers/tokens/holder_controller.ex
index 665a711107..368dcca2bc 100644
--- a/apps/block_scout_web/lib/block_scout_web/controllers/tokens/holder_controller.ex
+++ b/apps/block_scout_web/lib/block_scout_web/controllers/tokens/holder_controller.ex
@@ -19,8 +19,6 @@ defmodule BlockScoutWeb.Tokens.HolderController do
          token_balances <- Chain.fetch_token_holders_from_token_hash(address_hash, paging_options(params)) do
       {token_balances_paginated, next_page} = split_list_by_page(token_balances)
 
-      check_if_percentage_is_correct(token_balances, token)
-
       next_page_path =
         case next_page_params(next_page, token_balances_paginated, params) do
           nil ->
@@ -64,16 +62,4 @@ defmodule BlockScoutWeb.Tokens.HolderController do
         not_found(conn)
     end
   end
-
-  defp check_if_percentage_is_correct(token_balances, token) do
-    value_from_balances =
-      Enum.reduce(token_balances, Decimal.new(0), fn balance, acc ->
-        Decimal.add(balance.value, acc)
-      end)
-
-    if !(Decimal.cmp(token.total_supply, value_from_balances) == :eq ||
-           Decimal.cmp(token.total_supply, value_from_balances) == :gt) do
-      Task.start(MetadataUpdater, :update_metadata, [token])
-    end
-  end
 end
diff --git a/apps/indexer/lib/indexer/block/fetcher.ex b/apps/indexer/lib/indexer/block/fetcher.ex
index 73e4643a62..a4b24f88b6 100644
--- a/apps/indexer/lib/indexer/block/fetcher.ex
+++ b/apps/indexer/lib/indexer/block/fetcher.ex
@@ -148,6 +148,7 @@ defmodule Indexer.Block.Fetcher do
                transactions: %{params: transactions_with_receipts}
              }
            ) do
+      async_import_tokens(inserted)
       {:ok, %{inserted: inserted, errors: blocks_errors}}
     else
       {step, {:error, reason}} -> {:error, {step, reason}}
diff --git a/apps/indexer/lib/indexer/token/fetcher.ex b/apps/indexer/lib/indexer/token/fetcher.ex
index c18f1d6488..52f504f629 100644
--- a/apps/indexer/lib/indexer/token/fetcher.ex
+++ b/apps/indexer/lib/indexer/token/fetcher.ex
@@ -52,11 +52,8 @@ defmodule Indexer.Token.Fetcher do
   @decorate trace(name: "fetch", resource: "Indexer.Token.Fetcher.run/2", service: :indexer, tracer: Tracer)
   def run([token_contract_address], _json_rpc_named_arguments) do
     case Chain.token_from_address_hash(token_contract_address) do
-      {:ok, %Token{cataloged: false} = token} ->
+      {:ok, %Token{} = token} ->
         catalog_token(token)
-
-      {:ok, _} ->
-        :ok
     end
   end
 

From 82686a78ae8cfbed19dfa57479b064dec7974eeb Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Tue, 2 Apr 2019 12:12:29 +0300
Subject: [PATCH 16/28] update CHANGELOG

---
 CHANGELOG.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 815ecb208a..2109249985 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,7 +8,7 @@
 ### Fixes
 
  - [#1669](https://github.com/poanetwork/blockscout/pull/1669) - do not fail if multiple matching tokens are found
- - [#1691](https://github.com/poanetwork/blockscout/pull/1691) - decrease token metadata update interval and fetch metadata in controller
+ - [#1691](https://github.com/poanetwork/blockscout/pull/1691) - decrease token metadata update interval
  - [#1688](https://github.com/poanetwork/blockscout/pull/1688) - do not fail if failure reason is atom
 
 ### Chore

From f34e88d8ce45e63963d852002c8acf224cc51896 Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Tue, 2 Apr 2019 12:21:44 +0300
Subject: [PATCH 17/28] remove fetching token 2 times

---
 apps/indexer/lib/indexer/block/fetcher.ex | 1 -
 1 file changed, 1 deletion(-)

diff --git a/apps/indexer/lib/indexer/block/fetcher.ex b/apps/indexer/lib/indexer/block/fetcher.ex
index a4b24f88b6..73e4643a62 100644
--- a/apps/indexer/lib/indexer/block/fetcher.ex
+++ b/apps/indexer/lib/indexer/block/fetcher.ex
@@ -148,7 +148,6 @@ defmodule Indexer.Block.Fetcher do
                transactions: %{params: transactions_with_receipts}
              }
            ) do
-      async_import_tokens(inserted)
       {:ok, %{inserted: inserted, errors: blocks_errors}}
     else
       {step, {:error, reason}} -> {:error, {step, reason}}

From 0d17a69bf9005bb2c06290679af2026498290f73 Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Tue, 2 Apr 2019 12:25:27 +0300
Subject: [PATCH 18/28] fix build

---
 .../lib/block_scout_web/controllers/tokens/holder_controller.ex  | 1 -
 1 file changed, 1 deletion(-)

diff --git a/apps/block_scout_web/lib/block_scout_web/controllers/tokens/holder_controller.ex b/apps/block_scout_web/lib/block_scout_web/controllers/tokens/holder_controller.ex
index 368dcca2bc..27849eb7ad 100644
--- a/apps/block_scout_web/lib/block_scout_web/controllers/tokens/holder_controller.ex
+++ b/apps/block_scout_web/lib/block_scout_web/controllers/tokens/holder_controller.ex
@@ -3,7 +3,6 @@ defmodule BlockScoutWeb.Tokens.HolderController do
 
   alias BlockScoutWeb.Tokens.HolderView
   alias Explorer.{Chain, Market}
-  alias Indexer.Token.MetadataUpdater
   alias Phoenix.View
 
   import BlockScoutWeb.Chain,

From 318dbae4a91fa46b0a118f10da109e775dd63bff Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Tue, 2 Apr 2019 12:30:58 +0300
Subject: [PATCH 19/28] update gettext

---
 apps/block_scout_web/priv/gettext/default.pot | 31 ++++++++++++++++
 .../priv/gettext/en/LC_MESSAGES/default.po    | 36 +++++++++++++++++++
 .../lib/explorer/smart_contract/verifier.ex   | 12 +++----
 apps/indexer/lib/indexer/token/fetcher.ex     |  1 +
 4 files changed, 74 insertions(+), 6 deletions(-)

diff --git a/apps/block_scout_web/priv/gettext/default.pot b/apps/block_scout_web/priv/gettext/default.pot
index b7a816b050..28d3db09d8 100644
--- a/apps/block_scout_web/priv/gettext/default.pot
+++ b/apps/block_scout_web/priv/gettext/default.pot
@@ -1701,3 +1701,34 @@ msgstr ""
 #: lib/block_scout_web/templates/address_contract_verification/new.html.eex:63
 msgid "Enter constructor arguments if the contract had any"
 msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_decompiled_contract/index.html.eex:20
+msgid "Copy Decompiled Contract Code"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/views/address_view.ex:297
+msgid "Decompiled Code"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address/_tabs.html.eex:67
+#: lib/block_scout_web/templates/address/_tabs.html.eex:133
+msgid "Decompiled code"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_decompiled_contract/index.html.eex:18
+msgid "Decompiled contract code"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_decompiled_contract/index.html.eex:11
+msgid "Decompiler version"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:52
+msgid "Optimization runs"
+msgstr ""
diff --git a/apps/block_scout_web/priv/gettext/en/LC_MESSAGES/default.po b/apps/block_scout_web/priv/gettext/en/LC_MESSAGES/default.po
index 601f75e8b6..6dbdb2d676 100644
--- a/apps/block_scout_web/priv/gettext/en/LC_MESSAGES/default.po
+++ b/apps/block_scout_web/priv/gettext/en/LC_MESSAGES/default.po
@@ -1696,3 +1696,39 @@ msgstr ""
 #: lib/block_scout_web/templates/address_contract_verification/new.html.eex:31
 msgid "EVM Version"
 msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:63
+msgid "Enter constructor arguments if the contract had any"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_decompiled_contract/index.html.eex:20
+msgid "Copy Decompiled Contract Code"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/views/address_view.ex:297
+msgid "Decompiled Code"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address/_tabs.html.eex:67
+#: lib/block_scout_web/templates/address/_tabs.html.eex:133
+msgid "Decompiled code"
+msgstr ""
+
+#, elixir-format
+#: lib/block_scout_web/templates/address_decompiled_contract/index.html.eex:18
+msgid "Decompiled contract code"
+msgstr ""
+
+#, elixir-format, fuzzy
+#: lib/block_scout_web/templates/address_decompiled_contract/index.html.eex:11
+msgid "Decompiler version"
+msgstr ""
+
+#, elixir-format, fuzzy
+#: lib/block_scout_web/templates/address_contract_verification/new.html.eex:52
+msgid "Optimization runs"
+msgstr ""
diff --git a/apps/explorer/lib/explorer/smart_contract/verifier.ex b/apps/explorer/lib/explorer/smart_contract/verifier.ex
index cca72a6fa5..576b1fcef1 100644
--- a/apps/explorer/lib/explorer/smart_contract/verifier.ex
+++ b/apps/explorer/lib/explorer/smart_contract/verifier.ex
@@ -43,12 +43,12 @@ defmodule Explorer.SmartContract.Verifier do
 
         second_solc_output =
           CodeCompiler.run(
-            name,
-            compiler_version,
-            contract_source_code,
-            optimization,
-            next_evm_version,
-            external_libraries
+            name: name,
+            compiler_version: compiler_version,
+            code: contract_source_code,
+            optimize: optimization,
+            evm_version: next_evm_version,
+            external_libs: external_libraries
           )
 
         compare_bytecodes(second_solc_output, address_hash, constructor_arguments)
diff --git a/apps/indexer/lib/indexer/token/fetcher.ex b/apps/indexer/lib/indexer/token/fetcher.ex
index c18f1d6488..4b65f261f9 100644
--- a/apps/indexer/lib/indexer/token/fetcher.ex
+++ b/apps/indexer/lib/indexer/token/fetcher.ex
@@ -74,6 +74,7 @@ defmodule Indexer.Token.Fetcher do
       |> MetadataRetriever.get_functions_of()
       |> Map.put(:cataloged, true)
 
+
     {:ok, _} = Chain.update_token(token, token_params)
     :ok
   end

From a6a0d4c5a988e8f3edcffb60f3f407568a259aa7 Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Tue, 2 Apr 2019 13:20:45 +0300
Subject: [PATCH 20/28] fix test

---
 apps/indexer/lib/indexer/token/fetcher.ex        | 2 +-
 apps/indexer/test/indexer/token/fetcher_test.exs | 8 +-------
 2 files changed, 2 insertions(+), 8 deletions(-)

diff --git a/apps/indexer/lib/indexer/token/fetcher.ex b/apps/indexer/lib/indexer/token/fetcher.ex
index 52f504f629..818f27f138 100644
--- a/apps/indexer/lib/indexer/token/fetcher.ex
+++ b/apps/indexer/lib/indexer/token/fetcher.ex
@@ -71,7 +71,7 @@ defmodule Indexer.Token.Fetcher do
       |> MetadataRetriever.get_functions_of()
       |> Map.put(:cataloged, true)
 
-    {:ok, _} = Chain.update_token(token, token_params)
+    {:ok, _} = Chain.update_token(%{token | updated_at: DateTime.utc_now()}, token_params)
     :ok
   end
 end
diff --git a/apps/indexer/test/indexer/token/fetcher_test.exs b/apps/indexer/test/indexer/token/fetcher_test.exs
index 85872a70c5..9fdd3ab5c4 100644
--- a/apps/indexer/test/indexer/token/fetcher_test.exs
+++ b/apps/indexer/test/indexer/token/fetcher_test.exs
@@ -13,19 +13,13 @@ defmodule Indexer.Token.FetcherTest do
   describe "init/3" do
     test "returns uncataloged tokens", %{json_rpc_named_arguments: json_rpc_named_arguments} do
       insert(:token, cataloged: true)
-      %Token{contract_address_hash: uncatalog_address} = insert(:token, cataloged: false)
+      %Token{contract_address_hash: uncatalog_address} = insert(:token, cataloged: false) |> IO.inspect()
 
       assert Fetcher.init([], &[&1 | &2], json_rpc_named_arguments) == [uncatalog_address]
     end
   end
 
   describe "run/3" do
-    test "skips tokens that have already been cataloged", %{json_rpc_named_arguments: json_rpc_named_arguments} do
-      expect(EthereumJSONRPC.Mox, :json_rpc, 0, fn _, _ -> :ok end)
-      %Token{contract_address_hash: contract_address_hash} = insert(:token, cataloged: true)
-      assert Fetcher.run([contract_address_hash], json_rpc_named_arguments) == :ok
-    end
-
     test "catalogs tokens that haven't been cataloged", %{json_rpc_named_arguments: json_rpc_named_arguments} do
       token = insert(:token, name: nil, symbol: nil, total_supply: nil, decimals: nil, cataloged: false)
       contract_address_hash = token.contract_address_hash

From 76fee9241cb23d8a474de2a01f3c704254ecc8da Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Tue, 2 Apr 2019 13:23:33 +0300
Subject: [PATCH 21/28] mix format

---
 apps/indexer/lib/indexer/token/fetcher.ex | 1 -
 1 file changed, 1 deletion(-)

diff --git a/apps/indexer/lib/indexer/token/fetcher.ex b/apps/indexer/lib/indexer/token/fetcher.ex
index 4b65f261f9..c18f1d6488 100644
--- a/apps/indexer/lib/indexer/token/fetcher.ex
+++ b/apps/indexer/lib/indexer/token/fetcher.ex
@@ -74,7 +74,6 @@ defmodule Indexer.Token.Fetcher do
       |> MetadataRetriever.get_functions_of()
       |> Map.put(:cataloged, true)
 
-
     {:ok, _} = Chain.update_token(token, token_params)
     :ok
   end

From 9487d16201fddf1424a7c32e7296bf37a473c05b Mon Sep 17 00:00:00 2001
From: Ayrat Badykov <ayratin555@gmail.com>
Date: Tue, 2 Apr 2019 15:10:22 +0300
Subject: [PATCH 22/28] Update fetcher_test.exs

---
 apps/indexer/test/indexer/token/fetcher_test.exs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/apps/indexer/test/indexer/token/fetcher_test.exs b/apps/indexer/test/indexer/token/fetcher_test.exs
index 9fdd3ab5c4..d3e56d7712 100644
--- a/apps/indexer/test/indexer/token/fetcher_test.exs
+++ b/apps/indexer/test/indexer/token/fetcher_test.exs
@@ -13,7 +13,7 @@ defmodule Indexer.Token.FetcherTest do
   describe "init/3" do
     test "returns uncataloged tokens", %{json_rpc_named_arguments: json_rpc_named_arguments} do
       insert(:token, cataloged: true)
-      %Token{contract_address_hash: uncatalog_address} = insert(:token, cataloged: false) |> IO.inspect()
+      %Token{contract_address_hash: uncatalog_address} = insert(:token, cataloged: false)
 
       assert Fetcher.init([], &[&1 | &2], json_rpc_named_arguments) == [uncatalog_address]
     end

From 5606ca22ef2d717f66964bb3cdf72efd374b0c63 Mon Sep 17 00:00:00 2001
From: zachdaniel <zachary.s.daniel@gmail.com>
Date: Tue, 26 Mar 2019 17:12:25 -0400
Subject: [PATCH 23/28] feat: add not_decompiled_with_version filter

---
 .../api/rpc/contract_controller.ex            | 22 +++++++-
 .../controllers/api/rpc/rpc_translator.ex     |  3 +-
 .../lib/block_scout_web/etherscan.ex          |  6 +++
 .../views/api/rpc/contract_view.ex            | 24 +++++++--
 .../api/rpc/contract_controller_test.exs      | 54 +++++++++++++++++++
 apps/explorer/lib/explorer/chain.ex           | 42 +++++++++++----
 apps/explorer/lib/explorer/chain/address.ex   |  1 -
 .../lib/explorer/chain/smart_contract.ex      |  6 +--
 8 files changed, 138 insertions(+), 20 deletions(-)

diff --git a/apps/block_scout_web/lib/block_scout_web/controllers/api/rpc/contract_controller.ex b/apps/block_scout_web/lib/block_scout_web/controllers/api/rpc/contract_controller.ex
index 8a8036f2b4..d2aa6fb07b 100644
--- a/apps/block_scout_web/lib/block_scout_web/controllers/api/rpc/contract_controller.ex
+++ b/apps/block_scout_web/lib/block_scout_web/controllers/api/rpc/contract_controller.ex
@@ -7,7 +7,7 @@ defmodule BlockScoutWeb.API.RPC.ContractController do
 
   def listcontracts(conn, params) do
     with pagination_options <- Helpers.put_pagination_options(%{}, params),
-         {:params, {:ok, options}} <- {:params, add_filter(pagination_options, params)} do
+         {:params, {:ok, options}} <- {:params, add_filters(pagination_options, params)} do
       options_with_defaults =
         options
         |> Map.put_new(:page_number, 0)
@@ -71,7 +71,8 @@ defmodule BlockScoutWeb.API.RPC.ContractController do
         Chain.list_verified_contracts(page_size, offset)
 
       :decompiled ->
-        Chain.list_decompiled_contracts(page_size, offset)
+        not_decompiled_with_version = Map.get(opts, :not_decompiled_with_version)
+        Chain.list_decompiled_contracts(page_size, offset, not_decompiled_with_version)
 
       :unverified ->
         Chain.list_unverified_contracts(page_size, offset)
@@ -84,6 +85,12 @@ defmodule BlockScoutWeb.API.RPC.ContractController do
     end
   end
 
+  defp add_filters(options, params) do
+    options
+    |> add_filter(params)
+    |> add_not_decompiled_with_version(params)
+  end
+
   defp add_filter(options, params) do
     with {:param, {:ok, value}} <- {:param, Map.fetch(params, "filter")},
          {:validation, {:ok, filter}} <- {:validation, contracts_filter(value)} do
@@ -94,6 +101,17 @@ defmodule BlockScoutWeb.API.RPC.ContractController do
     end
   end
 
+  defp add_not_decompiled_with_version({:ok, options}, params) do
+    case Map.fetch(params, "not_decompiled_with_version") do
+      {:ok, value} -> {:ok, Map.put(options, :not_decompiled_with_version, value)}
+      :error -> {:ok, options}
+    end
+  end
+
+  defp add_not_decompiled_with_version(options, _params) do
+    options
+  end
+
   defp contracts_filter(nil), do: {:ok, nil}
   defp contracts_filter(1), do: {:ok, :verified}
   defp contracts_filter(2), do: {:ok, :decompiled}
diff --git a/apps/block_scout_web/lib/block_scout_web/controllers/api/rpc/rpc_translator.ex b/apps/block_scout_web/lib/block_scout_web/controllers/api/rpc/rpc_translator.ex
index 75bb51fa50..b1db31a8f3 100644
--- a/apps/block_scout_web/lib/block_scout_web/controllers/api/rpc/rpc_translator.ex
+++ b/apps/block_scout_web/lib/block_scout_web/controllers/api/rpc/rpc_translator.ex
@@ -66,6 +66,7 @@ defmodule BlockScoutWeb.API.RPC.RPCTranslator do
   def call_controller(conn, controller, action) do
     {:ok, controller.call(conn, action)}
   rescue
-    Conn.WrapperError -> :error
+    Conn.WrapperError ->
+      :error
   end
 end
diff --git a/apps/block_scout_web/lib/block_scout_web/etherscan.ex b/apps/block_scout_web/lib/block_scout_web/etherscan.ex
index 4162a77e70..07b7b5056b 100644
--- a/apps/block_scout_web/lib/block_scout_web/etherscan.ex
+++ b/apps/block_scout_web/lib/block_scout_web/etherscan.ex
@@ -1719,6 +1719,12 @@ defmodule BlockScoutWeb.Etherscan do
         type: "string",
         description:
           "verified|decompiled|unverified|not_decompiled, or 1|2|3|4 respectively. This requests only contracts with that status."
+      },
+      %{
+        key: "not_decompiled_with_version",
+        type: "string",
+        description:
+          "Ensures that none of the returned contracts were decompiled with the provided version. Ignored unless filtering for decompiled contracts."
       }
     ],
     responses: [
diff --git a/apps/block_scout_web/lib/block_scout_web/views/api/rpc/contract_view.ex b/apps/block_scout_web/lib/block_scout_web/views/api/rpc/contract_view.ex
index fbe1813dce..c2c593a313 100644
--- a/apps/block_scout_web/lib/block_scout_web/views/api/rpc/contract_view.ex
+++ b/apps/block_scout_web/lib/block_scout_web/views/api/rpc/contract_view.ex
@@ -36,19 +36,27 @@ defmodule BlockScoutWeb.API.RPC.ContractView do
   end
 
   defp prepare_source_code_contract(contract, _) do
+    decompiled_smart_contract = latest_decompiled_smart_contract(contract.decompiled_smart_contracts)
+
     %{
       "Address" => to_string(contract.address_hash),
       "SourceCode" => contract.contract_source_code,
       "ABI" => Jason.encode!(contract.abi),
       "ContractName" => contract.name,
-      "DecompiledSourceCode" => decompiled_source_code(contract.decompiled_smart_contract),
-      "DecompilerVersion" => decompiler_version(contract.decompiled_smart_contract),
+      "DecompiledSourceCode" => decompiled_source_code(decompiled_smart_contract),
+      "DecompilerVersion" => decompiler_version(decompiled_smart_contract),
       "CompilerVersion" => contract.compiler_version,
       "OptimizationUsed" => if(contract.optimization, do: "1", else: "0")
     }
   end
 
-  defp prepare_contract(%Address{hash: hash, smart_contract: nil, decompiled_smart_contract: decompiled_smart_contract}) do
+  defp prepare_contract(%Address{
+         hash: hash,
+         smart_contract: nil,
+         decompiled_smart_contracts: decompiled_smart_contracts
+       }) do
+    decompiled_smart_contract = latest_decompiled_smart_contract(decompiled_smart_contracts)
+
     %{
       "Address" => to_string(hash),
       "SourceCode" => "",
@@ -64,8 +72,10 @@ defmodule BlockScoutWeb.API.RPC.ContractView do
   defp prepare_contract(%Address{
          hash: hash,
          smart_contract: %SmartContract{} = contract,
-         decompiled_smart_contract: decompiled_smart_contract
+         decompiled_smart_contracts: decompiled_smart_contracts
        }) do
+    decompiled_smart_contract = latest_decompiled_smart_contract(decompiled_smart_contracts)
+
     %{
       "Address" => to_string(hash),
       "SourceCode" => contract.contract_source_code,
@@ -78,6 +88,12 @@ defmodule BlockScoutWeb.API.RPC.ContractView do
     }
   end
 
+  defp latest_decompiled_smart_contract([]), do: nil
+
+  defp latest_decompiled_smart_contract(contracts) do
+    Enum.max_by(contracts, fn contract -> DateTime.to_unix(contract.inserted_at) end)
+  end
+
   defp decompiled_source_code(nil), do: "Contract source code not decompiled."
 
   defp decompiled_source_code(%DecompiledSmartContract{decompiled_source_code: decompiled_source_code}) do
diff --git a/apps/block_scout_web/test/block_scout_web/controllers/api/rpc/contract_controller_test.exs b/apps/block_scout_web/test/block_scout_web/controllers/api/rpc/contract_controller_test.exs
index 766a691a62..d299d6bc73 100644
--- a/apps/block_scout_web/test/block_scout_web/controllers/api/rpc/contract_controller_test.exs
+++ b/apps/block_scout_web/test/block_scout_web/controllers/api/rpc/contract_controller_test.exs
@@ -157,6 +157,60 @@ defmodule BlockScoutWeb.API.RPC.ContractControllerTest do
              ]
     end
 
+    test "filtering for only decompiled contracts, with a decompiled with version filter", %{params: params, conn: conn} do
+      insert(:decompiled_smart_contract, decompiler_version: "foobar")
+      smart_contract = insert(:decompiled_smart_contract, decompiler_version: "bizbuz")
+
+      response =
+        conn
+        |> get("/api", Map.merge(params, %{"filter" => "decompiled", "not_decompiled_with_version" => "foobar"}))
+        |> json_response(200)
+
+      assert response["message"] == "OK"
+      assert response["status"] == "1"
+
+      assert response["result"] == [
+               %{
+                 "ABI" => "Contract source code not verified",
+                 "Address" => to_string(smart_contract.address_hash),
+                 "CompilerVersion" => "",
+                 "ContractName" => "",
+                 "DecompiledSourceCode" => smart_contract.decompiled_source_code,
+                 "DecompilerVersion" => "bizbuz",
+                 "OptimizationUsed" => "",
+                 "SourceCode" => ""
+               }
+             ]
+    end
+
+    test "filtering for only decompiled contracts, with a decompiled with version filter, where another decompiled version exists",
+         %{params: params, conn: conn} do
+      non_match = insert(:decompiled_smart_contract, decompiler_version: "foobar")
+      insert(:decompiled_smart_contract, decompiler_version: "bizbuz", address_hash: non_match.address_hash)
+      smart_contract = insert(:decompiled_smart_contract, decompiler_version: "bizbuz")
+
+      response =
+        conn
+        |> get("/api", Map.merge(params, %{"filter" => "decompiled", "not_decompiled_with_version" => "foobar"}))
+        |> json_response(200)
+
+      assert response["message"] == "OK"
+      assert response["status"] == "1"
+
+      assert response["result"] == [
+               %{
+                 "ABI" => "Contract source code not verified",
+                 "Address" => to_string(smart_contract.address_hash),
+                 "CompilerVersion" => "",
+                 "ContractName" => "",
+                 "DecompiledSourceCode" => smart_contract.decompiled_source_code,
+                 "DecompilerVersion" => "bizbuz",
+                 "OptimizationUsed" => "",
+                 "SourceCode" => ""
+               }
+             ]
+    end
+
     test "filtering for only not_decompiled (and by extension not verified contracts)", %{params: params, conn: conn} do
       insert(:decompiled_smart_contract)
       insert(:smart_contract)
diff --git a/apps/explorer/lib/explorer/chain.ex b/apps/explorer/lib/explorer/chain.ex
index fcbd813ef4..34f755f276 100644
--- a/apps/explorer/lib/explorer/chain.ex
+++ b/apps/explorer/lib/explorer/chain.ex
@@ -2666,19 +2666,38 @@ defmodule Explorer.Chain do
     Repo.all(query, timeout: :infinity)
   end
 
-  def list_decompiled_contracts(limit, offset) do
+  def list_decompiled_contracts(limit, offset, not_decompiled_with_version \\ nil) do
     query =
       from(
         address in Address,
-        join: decompiled_smart_contract in DecompiledSmartContract,
-        on: decompiled_smart_contract.address_hash == address.hash,
-        preload: [{:decompiled_smart_contract, decompiled_smart_contract}, :smart_contract],
+        where:
+          fragment(
+            "EXISTS (SELECT 1 FROM decompiled_smart_contracts WHERE decompiled_smart_contracts.address_hash = ?)",
+            address.hash
+          ),
+        preload: [:decompiled_smart_contracts, :smart_contract],
         order_by: [asc: address.inserted_at],
         limit: ^limit,
         offset: ^offset
       )
 
-    Repo.all(query)
+    query
+    |> filter_decompiled_with_version(not_decompiled_with_version)
+    |> Repo.all()
+  end
+
+  defp filter_decompiled_with_version(query, nil) do
+    query
+  end
+
+  defp filter_decompiled_with_version(query, not_decompiled_with_version) do
+    from(address in query,
+      left_join: decompiled_smart_contract in DecompiledSmartContract,
+      on: decompiled_smart_contract.decompiler_version == ^not_decompiled_with_version,
+      on: decompiled_smart_contract.address_hash == address.hash,
+      where: is_nil(decompiled_smart_contract.id),
+      distinct: [address.hash]
+    )
   end
 
   def list_verified_contracts(limit, offset) do
@@ -2688,7 +2707,7 @@ defmodule Explorer.Chain do
         where: not is_nil(address.contract_code),
         join: smart_contract in SmartContract,
         on: smart_contract.address_hash == address.hash,
-        preload: [{:smart_contract, smart_contract}, :decompiled_smart_contract],
+        preload: [{:smart_contract, smart_contract}, :decompiled_smart_contracts],
         order_by: [asc: address.inserted_at],
         limit: ^limit,
         offset: ^offset
@@ -2702,7 +2721,7 @@ defmodule Explorer.Chain do
       from(
         address in Address,
         where: not is_nil(address.contract_code),
-        preload: [:smart_contract, :decompiled_smart_contract],
+        preload: [:smart_contract, :decompiled_smart_contracts],
         order_by: [asc: address.inserted_at],
         limit: ^limit,
         offset: ^offset
@@ -2719,7 +2738,7 @@ defmodule Explorer.Chain do
         on: smart_contract.address_hash == address.hash,
         where: not is_nil(address.contract_code),
         where: is_nil(smart_contract.address_hash),
-        preload: [{:smart_contract, smart_contract}, :decompiled_smart_contract],
+        preload: [{:smart_contract, smart_contract}, :decompiled_smart_contracts],
         order_by: [asc: address.inserted_at],
         limit: ^limit,
         offset: ^offset
@@ -2732,11 +2751,16 @@ defmodule Explorer.Chain do
     query =
       from(
         address in Address,
+        where:
+          fragment(
+            "NOT EXISTS (SELECT 1 FROM decompiled_smart_contracts WHERE decompiled_smart_contracts.address_hash = ?)",
+            address.hash
+          ),
         left_join: smart_contract in SmartContract,
         on: smart_contract.address_hash == address.hash,
         left_join: decompiled_smart_contract in DecompiledSmartContract,
         on: decompiled_smart_contract.address_hash == address.hash,
-        preload: [smart_contract: smart_contract, decompiled_smart_contract: decompiled_smart_contract],
+        preload: [:smart_contract, :decompiled_smart_contracts],
         where: not is_nil(address.contract_code),
         where: is_nil(smart_contract.address_hash),
         where: is_nil(decompiled_smart_contract.address_hash),
diff --git a/apps/explorer/lib/explorer/chain/address.ex b/apps/explorer/lib/explorer/chain/address.ex
index 7fd71d6af6..d4b5bc8174 100644
--- a/apps/explorer/lib/explorer/chain/address.ex
+++ b/apps/explorer/lib/explorer/chain/address.ex
@@ -78,7 +78,6 @@ defmodule Explorer.Chain.Address do
     field(:has_decompiled_code?, :boolean, virtual: true)
 
     has_one(:smart_contract, SmartContract)
-    has_one(:decompiled_smart_contract, DecompiledSmartContract)
     has_one(:token, Token, foreign_key: :contract_address_hash)
 
     has_one(
diff --git a/apps/explorer/lib/explorer/chain/smart_contract.ex b/apps/explorer/lib/explorer/chain/smart_contract.ex
index a117a77353..937c1d422f 100644
--- a/apps/explorer/lib/explorer/chain/smart_contract.ex
+++ b/apps/explorer/lib/explorer/chain/smart_contract.ex
@@ -209,8 +209,8 @@ defmodule Explorer.Chain.SmartContract do
     field(:constructor_arguments, :string)
     field(:abi, {:array, :map})
 
-    has_one(
-      :decompiled_smart_contract,
+    has_many(
+      :decompiled_smart_contracts,
       DecompiledSmartContract,
       foreign_key: :address_hash
     )
@@ -227,7 +227,7 @@ defmodule Explorer.Chain.SmartContract do
   end
 
   def preload_decompiled_smart_contract(contract) do
-    Repo.preload(contract, :decompiled_smart_contract)
+    Repo.preload(contract, :decompiled_smart_contracts)
   end
 
   def changeset(%__MODULE__{} = smart_contract, attrs) do

From 9dbf51db94e88563460a6ea0bf85bec92ef12132 Mon Sep 17 00:00:00 2001
From: goodsoft <goodsoft@goodsoft.lv>
Date: Fri, 29 Mar 2019 16:34:14 +0200
Subject: [PATCH 24/28] Remove obsolete ConsensusEnsurer

As a result of #1657 out-of-place parent blocks are marked as non-consensus
more reliably, i.e. they will eventually be fetched even if first attempt is
unsuccessful.

The `ConsensusEnsurer` module, on the contrary, only tried refetching block
once, and left it as-is if the refetch failed. Now it is not needed anymore.
---
 .../block/realtime/consensus_ensurer.ex       | 34 -------------------
 .../lib/indexer/block/realtime/fetcher.ex     |  9 ++---
 2 files changed, 2 insertions(+), 41 deletions(-)
 delete mode 100644 apps/indexer/lib/indexer/block/realtime/consensus_ensurer.ex

diff --git a/apps/indexer/lib/indexer/block/realtime/consensus_ensurer.ex b/apps/indexer/lib/indexer/block/realtime/consensus_ensurer.ex
deleted file mode 100644
index 816f1d76bf..0000000000
--- a/apps/indexer/lib/indexer/block/realtime/consensus_ensurer.ex
+++ /dev/null
@@ -1,34 +0,0 @@
-defmodule Indexer.Block.Realtime.ConsensusEnsurer do
-  @moduledoc """
-  Triggers a refetch if a given block doesn't have consensus.
-
-  """
-  require Logger
-
-  alias Explorer.Chain
-  alias Explorer.Chain.Hash
-  alias Indexer.Block.Realtime.Fetcher
-
-  def perform(_, number, _) when not is_integer(number) or number < 0, do: :ok
-
-  def perform(%Hash{byte_count: unquote(Hash.Full.byte_count())} = block_hash, number, block_fetcher) do
-    case Chain.hash_to_block(block_hash) do
-      {:ok, %{consensus: true} = _block} ->
-        :ignore
-
-      _ ->
-        Logger.info(fn ->
-          [
-            "refetch from consensus was found on block (",
-            to_string(number),
-            "). A reorg initiated."
-          ]
-        end)
-
-        # trigger refetch if consensus=false or block was not found
-        Fetcher.fetch_and_import_block(number, block_fetcher, true)
-    end
-
-    :ok
-  end
-end
diff --git a/apps/indexer/lib/indexer/block/realtime/fetcher.ex b/apps/indexer/lib/indexer/block/realtime/fetcher.ex
index 49787ad675..fe486f62c2 100644
--- a/apps/indexer/lib/indexer/block/realtime/fetcher.ex
+++ b/apps/indexer/lib/indexer/block/realtime/fetcher.ex
@@ -27,7 +27,7 @@ defmodule Indexer.Block.Realtime.Fetcher do
   alias Explorer.Chain.TokenTransfer
   alias Explorer.Counters.AverageBlockTime
   alias Indexer.{AddressExtraction, Block, TokenBalances, Tracer}
-  alias Indexer.Block.Realtime.{ConsensusEnsurer, TaskSupervisor}
+  alias Indexer.Block.Realtime.TaskSupervisor
   alias Timex.Duration
 
   @behaviour Block.Fetcher
@@ -269,12 +269,7 @@ defmodule Indexer.Block.Realtime.Fetcher do
   @decorate span(tracer: Tracer)
   defp do_fetch_and_import_block(block_number_to_fetch, block_fetcher, retry) do
     case fetch_and_import_range(block_fetcher, block_number_to_fetch..block_number_to_fetch) do
-      {:ok, %{inserted: inserted, errors: []}} ->
-        for block <- Map.get(inserted, :blocks, []) do
-          args = [block.parent_hash, block.number - 1, block_fetcher]
-          Task.Supervisor.start_child(TaskSupervisor, ConsensusEnsurer, :perform, args)
-        end
-
+      {:ok, %{inserted: _, errors: []}} ->
         Logger.debug("Fetched and imported.")
 
       {:ok, %{inserted: _, errors: [_ | _] = errors}} ->

From 89430a5b5341d12d32b0b086f4c1aa24dffcaece Mon Sep 17 00:00:00 2001
From: goodsoft <goodsoft@goodsoft.lv>
Date: Fri, 29 Mar 2019 17:04:11 +0200
Subject: [PATCH 25/28] Expand non-consensus block regression test to test for
 race conditions

Consider a root block `A`, old chain `-- B -- C` and new one `-- B' -- C'`.
Due to asynchronous nature of realtime fetcher it is possible for block
`B` to be imported _later_ than the entire chain `-- B' -- C'`.

In this case we should discard block `C'` and let it be refetched.
When that happens, block `B` gets discarded to make sure block `B'` gets
eventually fetched and the chain becomes consistent.
---
 .../chain/import/runner/blocks_test.exs       | 40 ++++++++++---------
 1 file changed, 21 insertions(+), 19 deletions(-)

diff --git a/apps/explorer/test/explorer/chain/import/runner/blocks_test.exs b/apps/explorer/test/explorer/chain/import/runner/blocks_test.exs
index 3d6fd912cc..ecf1d71dfb 100644
--- a/apps/explorer/test/explorer/chain/import/runner/blocks_test.exs
+++ b/apps/explorer/test/explorer/chain/import/runner/blocks_test.exs
@@ -261,34 +261,36 @@ defmodule Explorer.Chain.Import.Runner.BlocksTest do
     end
 
     # Regression test for https://github.com/poanetwork/blockscout/issues/1644
-    test "discards parent block if it isn't related to the current one because of reorg",
+    test "discards neighbouring blocks if they aren't related to the current one because of reorg and/or import timeout",
          %{consensus_block: %Block{number: block_number, hash: block_hash, miner_hash: miner_hash}, options: options} do
-      old_block = insert(:block, parent_hash: block_hash, number: block_number + 1)
-      insert(:block, parent_hash: old_block.hash, number: old_block.number + 1)
+      old_block1 = params_for(:block, miner_hash: miner_hash, parent_hash: block_hash, number: block_number + 1)
 
-      new_block1 = params_for(:block, parent_hash: block_hash, number: block_number + 1, miner_hash: miner_hash)
+      new_block1 = params_for(:block, miner_hash: miner_hash, parent_hash: block_hash, number: block_number + 1)
+      new_block2 = params_for(:block, miner_hash: miner_hash, parent_hash: new_block1.hash, number: block_number + 2)
 
-      new_block2 =
-        params_for(:block, parent_hash: new_block1.hash, number: new_block1.number + 1, miner_hash: miner_hash)
+      range = block_number..(block_number + 2)
 
-      %Ecto.Changeset{valid?: true, changes: block_changes} = Block.changeset(%Block{}, new_block2)
-      changes_list = [block_changes]
+      insert_block(new_block1, options)
+      insert_block(new_block2, options)
+      assert Chain.missing_block_number_ranges(range) == []
 
-      Multi.new()
-      |> Blocks.run(changes_list, options)
-      |> Repo.transaction()
+      insert_block(old_block1, options)
+      assert Chain.missing_block_number_ranges(range) == [(block_number + 2)..(block_number + 2)]
 
-      assert Chain.missing_block_number_ranges(block_number..new_block2.number) == [old_block.number..old_block.number]
+      insert_block(new_block2, options)
+      assert Chain.missing_block_number_ranges(range) == [(block_number + 1)..(block_number + 1)]
 
-      %Ecto.Changeset{valid?: true, changes: block_changes} = Block.changeset(%Block{}, new_block1)
-      changes_list = [block_changes]
+      insert_block(new_block1, options)
+      assert Chain.missing_block_number_ranges(range) == []
+    end
+  end
 
-      Multi.new()
-      |> Blocks.run(changes_list, options)
-      |> Repo.transaction()
+  defp insert_block(block_params, options) do
+    %Ecto.Changeset{valid?: true, changes: block_changes} = Block.changeset(%Block{}, block_params)
 
-      assert Chain.missing_block_number_ranges(block_number..new_block2.number) == []
-    end
+    Multi.new()
+    |> Blocks.run([block_changes], options)
+    |> Repo.transaction()
   end
 
   defp count(schema) do

From 6450c3ac61049f7cddc6f33da9109685fb2de417 Mon Sep 17 00:00:00 2001
From: goodsoft <goodsoft@goodsoft.lv>
Date: Fri, 29 Mar 2019 17:39:17 +0200
Subject: [PATCH 26/28] Discard child block with parent_hash not matching hash
 of imported block

Consider a root block `A`, old chain `-- B -- C` and new one `-- B' -- C'`.
Due to asynchronous nature of realtime fetcher it is possible for block
`B` to be imported _later_ than the entire chain `-- B' -- C'`.

In this case we should discard block `C'` and let it be refetched.
When that happens, block `B` gets discarded to make sure block `B'` gets
eventually fetched and the chain becomes consistent.
---
 CHANGELOG.md                                  |  1 +
 .../explorer/chain/import/runner/blocks.ex    | 28 +++++++++++++------
 2 files changed, 20 insertions(+), 9 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index a729aa7bad..2d2255cf86 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@
  - [#1691](https://github.com/poanetwork/blockscout/pull/1691) - decrease token metadata update interval
  - [#1688](https://github.com/poanetwork/blockscout/pull/1688) - do not fail if failure reason is atom
  - [#1692](https://github.com/poanetwork/blockscout/pull/1692) - exclude decompiled smart contract from encoding
+ - [#1684](https://github.com/poanetwork/blockscout/pull/1684) - Discard child block with parent_hash not matching hash of imported block
 
 ### Chore
 
diff --git a/apps/explorer/lib/explorer/chain/import/runner/blocks.ex b/apps/explorer/lib/explorer/chain/import/runner/blocks.ex
index 100f120290..209d5d2fa6 100644
--- a/apps/explorer/lib/explorer/chain/import/runner/blocks.ex
+++ b/apps/explorer/lib/explorer/chain/import/runner/blocks.ex
@@ -46,7 +46,7 @@ defmodule Explorer.Chain.Import.Runner.Blocks do
       |> Map.put(:timestamps, timestamps)
 
     ordered_consensus_block_numbers = ordered_consensus_block_numbers(changes_list)
-    where_invalid_parent = where_invalid_parent(changes_list)
+    where_invalid_neighbour = where_invalid_neighbour(changes_list)
     where_forked = where_forked(changes_list)
 
     multi
@@ -70,8 +70,8 @@ defmodule Explorer.Chain.Import.Runner.Blocks do
     |> Multi.run(:lose_consensus, fn repo, _ ->
       lose_consensus(repo, ordered_consensus_block_numbers, insert_options)
     end)
-    |> Multi.run(:lose_invalid_parent_consensus, fn repo, _ ->
-      lose_invalid_parent_consensus(repo, where_invalid_parent, insert_options)
+    |> Multi.run(:lose_invalid_neighbour_consensus, fn repo, _ ->
+      lose_invalid_neighbour_consensus(repo, where_invalid_neighbour, insert_options)
     end)
     |> Multi.run(:delete_address_token_balances, fn repo, _ ->
       delete_address_token_balances(repo, ordered_consensus_block_numbers, insert_options)
@@ -316,13 +316,13 @@ defmodule Explorer.Chain.Import.Runner.Blocks do
     end
   end
 
-  defp lose_invalid_parent_consensus(repo, where_invalid_parent, %{
+  defp lose_invalid_neighbour_consensus(repo, where_invalid_neighbour, %{
          timeout: timeout,
          timestamps: %{updated_at: updated_at}
        }) do
     query =
       from(
-        block in where_invalid_parent,
+        block in where_invalid_neighbour,
         update: [
           set: [
             consensus: false,
@@ -338,7 +338,7 @@ defmodule Explorer.Chain.Import.Runner.Blocks do
       {:ok, result}
     rescue
       postgrex_error in Postgrex.Error ->
-        {:error, %{exception: postgrex_error, where_invalid_parent: where_invalid_parent}}
+        {:error, %{exception: postgrex_error, where_invalid_neighbour: where_invalid_neighbour}}
     end
   end
 
@@ -581,12 +581,22 @@ defmodule Explorer.Chain.Import.Runner.Blocks do
     end)
   end
 
-  defp where_invalid_parent(blocks_changes) when is_list(blocks_changes) do
+  defp where_invalid_neighbour(blocks_changes) when is_list(blocks_changes) do
     initial = from(b in Block, where: false)
 
-    Enum.reduce(blocks_changes, initial, fn %{consensus: consensus, parent_hash: parent_hash, number: number}, acc ->
+    Enum.reduce(blocks_changes, initial, fn %{
+                                              consensus: consensus,
+                                              hash: hash,
+                                              parent_hash: parent_hash,
+                                              number: number
+                                            },
+                                            acc ->
       if consensus do
-        from(block in acc, or_where: block.number == ^(number - 1) and block.hash != ^parent_hash)
+        from(
+          block in acc,
+          or_where: block.number == ^(number - 1) and block.hash != ^parent_hash,
+          or_where: block.number == ^(number + 1) and block.parent_hash != ^hash
+        )
       else
         acc
       end

From 0e15873fbcf4de2f399f5032d86b9afc238227bb Mon Sep 17 00:00:00 2001
From: goodsoft <goodsoft@goodsoft.lv>
Date: Fri, 29 Mar 2019 20:16:48 +0200
Subject: [PATCH 27/28] Remove obsolete InvalidConsensus.Worker

This worker only handled one of invalid consensus cases, i.e. when a parent
block lost consensus, but the child one didn't.
Even then it worked only when all blocks are reliably and sequentially
imported (certainly not our case), and only once on indexer launch.

Now this particular case is covered by previous commit, and we don't need
this worker at all.
---
 apps/explorer/lib/explorer/chain.ex           | 18 ----
 apps/explorer/test/explorer/chain_test.exs    | 21 ----
 .../block/invalid_consensus/supervisor.ex     | 45 ---------
 .../indexer/block/invalid_consensus/worker.ex | 99 -------------------
 apps/indexer/lib/indexer/block/supervisor.ex  |  3 +-
 .../block/invalid_consensus/worker_test.exs   | 87 ----------------
 6 files changed, 1 insertion(+), 272 deletions(-)
 delete mode 100644 apps/indexer/lib/indexer/block/invalid_consensus/supervisor.ex
 delete mode 100644 apps/indexer/lib/indexer/block/invalid_consensus/worker.ex
 delete mode 100644 apps/indexer/test/indexer/block/invalid_consensus/worker_test.exs

diff --git a/apps/explorer/lib/explorer/chain.ex b/apps/explorer/lib/explorer/chain.ex
index 34f755f276..d882e56b51 100644
--- a/apps/explorer/lib/explorer/chain.ex
+++ b/apps/explorer/lib/explorer/chain.ex
@@ -2648,24 +2648,6 @@ defmodule Explorer.Chain do
   @spec data() :: Dataloader.Ecto.t()
   def data, do: DataloaderEcto.new(Repo)
 
-  @doc """
-  Returns a list of block numbers with invalid consensus.
-  """
-  @spec list_block_numbers_with_invalid_consensus :: [integer()]
-  def list_block_numbers_with_invalid_consensus do
-    query =
-      from(
-        block in Block,
-        join: parent in Block,
-        on: parent.hash == block.parent_hash,
-        where: block.consensus == true,
-        where: parent.consensus == false,
-        select: parent.number
-      )
-
-    Repo.all(query, timeout: :infinity)
-  end
-
   def list_decompiled_contracts(limit, offset, not_decompiled_with_version \\ nil) do
     query =
       from(
diff --git a/apps/explorer/test/explorer/chain_test.exs b/apps/explorer/test/explorer/chain_test.exs
index c408716afd..ebb4b880dd 100644
--- a/apps/explorer/test/explorer/chain_test.exs
+++ b/apps/explorer/test/explorer/chain_test.exs
@@ -3667,27 +3667,6 @@ defmodule Explorer.ChainTest do
     end
   end
 
-  describe "list_block_numbers_with_invalid_consensus/0" do
-    test "returns a list of block numbers with invalid consensus" do
-      block1 = insert(:block)
-      block2_with_invalid_consensus = insert(:block, parent_hash: block1.hash, consensus: false)
-      _block2 = insert(:block, parent_hash: block1.hash, number: block2_with_invalid_consensus.number)
-      block3 = insert(:block, parent_hash: block2_with_invalid_consensus.hash)
-      block4 = insert(:block, parent_hash: block3.hash)
-      block5 = insert(:block, parent_hash: block4.hash)
-      block6_without_consensus = insert(:block, parent_hash: block5.hash, consensus: false)
-      block6 = insert(:block, parent_hash: block5.hash, number: block6_without_consensus.number)
-      block7 = insert(:block, parent_hash: block6.hash)
-      block8_with_invalid_consensus = insert(:block, parent_hash: block7.hash, consensus: false)
-      _block8 = insert(:block, parent_hash: block7.hash, number: block8_with_invalid_consensus.number)
-      block9 = insert(:block, parent_hash: block8_with_invalid_consensus.hash)
-      _block10 = insert(:block, parent_hash: block9.hash)
-
-      assert Chain.list_block_numbers_with_invalid_consensus() ==
-               [block2_with_invalid_consensus.number, block8_with_invalid_consensus.number]
-    end
-  end
-
   describe "block_combined_rewards/1" do
     test "sums the block_rewards values" do
       block = insert(:block)
diff --git a/apps/indexer/lib/indexer/block/invalid_consensus/supervisor.ex b/apps/indexer/lib/indexer/block/invalid_consensus/supervisor.ex
deleted file mode 100644
index cca692a76c..0000000000
--- a/apps/indexer/lib/indexer/block/invalid_consensus/supervisor.ex
+++ /dev/null
@@ -1,45 +0,0 @@
-defmodule Indexer.Block.InvalidConsensus.Supervisor do
-  @moduledoc """
-  Supervises process for ensuring blocks with invalid consensus get queued for
-  indexing.
-  """
-
-  use Supervisor
-
-  alias Indexer.Block.InvalidConsensus.Worker
-
-  def child_spec([]) do
-    child_spec([[]])
-  end
-
-  def child_spec([init_arguments]) do
-    child_spec([init_arguments, [name: __MODULE__]])
-  end
-
-  def child_spec([_init_arguments, _gen_server_options] = start_link_arguments) do
-    spec = %{
-      id: __MODULE__,
-      start: {__MODULE__, :start_link, start_link_arguments},
-      restart: :transient,
-      type: :supervisor
-    }
-
-    Supervisor.child_spec(spec, [])
-  end
-
-  def start_link(init_arguments, gen_server_options \\ []) do
-    Supervisor.start_link(__MODULE__, init_arguments, gen_server_options)
-  end
-
-  @impl Supervisor
-  def init(_) do
-    children = [
-      {Worker, [[supervisor: self()], [name: Worker]]},
-      {Task.Supervisor, name: Indexer.Block.InvalidConsensus.TaskSupervisor}
-    ]
-
-    opts = [strategy: :one_for_all]
-
-    Supervisor.init(children, opts)
-  end
-end
diff --git a/apps/indexer/lib/indexer/block/invalid_consensus/worker.ex b/apps/indexer/lib/indexer/block/invalid_consensus/worker.ex
deleted file mode 100644
index cbe93c604b..0000000000
--- a/apps/indexer/lib/indexer/block/invalid_consensus/worker.ex
+++ /dev/null
@@ -1,99 +0,0 @@
-defmodule Indexer.Block.InvalidConsensus.Worker do
-  @moduledoc """
-  Finds blocks with invalid consensus and queues them up to be refetched. This
-  process does this once, after the application starts up.
-
-  A block has invalid consensus when it is referenced as the parent hash of a
-  block with consensus while not having consensus (consensus=false). Only one
-  block can have consensus at a given height (block number).
-  """
-
-  use GenServer
-
-  require Logger
-
-  alias Explorer.Chain
-  alias Indexer.Block.Catchup.Fetcher
-  alias Indexer.Block.InvalidConsensus.TaskSupervisor
-
-  def child_spec([init_arguments]) do
-    child_spec([init_arguments, []])
-  end
-
-  def child_spec([_init_arguments, _gen_server_options] = start_link_arguments) do
-    spec = %{
-      id: __MODULE__,
-      start: {__MODULE__, :start_link, start_link_arguments},
-      restart: :transient,
-      type: :worker
-    }
-
-    Supervisor.child_spec(spec, [])
-  end
-
-  def start_link(init_arguments, gen_server_options \\ []) do
-    GenServer.start_link(__MODULE__, init_arguments, gen_server_options)
-  end
-
-  def init(opts) do
-    sup_pid = Keyword.fetch!(opts, :supervisor)
-    retry_interval = Keyword.get(opts, :retry_interval, 10_000)
-
-    send(self(), :scan)
-
-    state = %{
-      block_numbers: [],
-      retry_interval: retry_interval,
-      sup_pid: sup_pid,
-      task_ref: nil
-    }
-
-    {:ok, state}
-  end
-
-  def handle_info(:scan, state) do
-    block_numbers = Chain.list_block_numbers_with_invalid_consensus()
-
-    case block_numbers do
-      [] ->
-        Supervisor.stop(state.sup_pid, :normal)
-        {:noreply, state}
-
-      block_numbers ->
-        Process.send_after(self(), :push_front_blocks, state.retry_interval)
-        {:noreply, %{state | block_numbers: block_numbers}}
-    end
-  end
-
-  def handle_info(:push_front_blocks, %{block_numbers: block_numbers} = state) do
-    %Task{ref: ref} = async_push_front(block_numbers)
-    {:noreply, %{state | task_ref: ref}}
-  end
-
-  def handle_info({ref, :ok}, %{task_ref: ref, sup_pid: sup_pid}) do
-    Process.demonitor(ref, [:flush])
-    Supervisor.stop(sup_pid, :normal)
-    {:stop, :shutdown}
-  end
-
-  def handle_info({ref, {:error, reason}}, %{task_ref: ref, retry_interval: millis} = state) do
-    case reason do
-      :queue_unavailable -> :ok
-      _ -> Logger.error(fn -> inspect(reason) end)
-    end
-
-    Process.demonitor(ref, [:flush])
-    Process.send_after(self(), :push_front_blocks, millis)
-
-    {:noreply, %{state | task_ref: nil}}
-  end
-
-  def handle_info({:DOWN, ref, :process, _, _}, %{task_ref: ref, retry_interval: millis} = state) do
-    Process.send_after(self(), :push_front_blocks, millis)
-    {:noreply, %{state | task_ref: nil}}
-  end
-
-  defp async_push_front(block_numbers) do
-    Task.Supervisor.async_nolink(TaskSupervisor, Fetcher, :push_front, [block_numbers])
-  end
-end
diff --git a/apps/indexer/lib/indexer/block/supervisor.ex b/apps/indexer/lib/indexer/block/supervisor.ex
index 2bab786f18..50b24a6dd5 100644
--- a/apps/indexer/lib/indexer/block/supervisor.ex
+++ b/apps/indexer/lib/indexer/block/supervisor.ex
@@ -4,7 +4,7 @@ defmodule Indexer.Block.Supervisor do
   """
 
   alias Indexer.Block
-  alias Indexer.Block.{Catchup, InvalidConsensus, Realtime, Reward, Uncle}
+  alias Indexer.Block.{Catchup, Realtime, Reward, Uncle}
   alias Indexer.Temporary.{AddressesWithoutCode, FailedCreatedAddresses}
 
   use Supervisor
@@ -50,7 +50,6 @@ defmodule Indexer.Block.Supervisor do
            %{block_fetcher: block_fetcher, block_interval: block_interval, memory_monitor: memory_monitor},
            [name: Catchup.Supervisor]
          ]},
-        {InvalidConsensus.Supervisor, [[], [name: InvalidConsensus.Supervisor]]},
         {Realtime.Supervisor,
          [
            %{block_fetcher: realtime_block_fetcher, subscribe_named_arguments: realtime_subscribe_named_arguments},
diff --git a/apps/indexer/test/indexer/block/invalid_consensus/worker_test.exs b/apps/indexer/test/indexer/block/invalid_consensus/worker_test.exs
deleted file mode 100644
index a6fa07f0d3..0000000000
--- a/apps/indexer/test/indexer/block/invalid_consensus/worker_test.exs
+++ /dev/null
@@ -1,87 +0,0 @@
-defmodule Indexer.Block.InvalidConsensus.WorkerTest do
-  use Explorer.DataCase
-
-  alias Indexer.Sequence
-  alias Indexer.Block.InvalidConsensus.{Worker, TaskSupervisor}
-
-  @moduletag :capture_log
-
-  describe "start_link/1" do
-    test "starts the worker" do
-      assert {:ok, _pid} = Worker.start_link(supervisor: self())
-    end
-  end
-
-  describe "init/1" do
-    test "sends message to self" do
-      pid = self()
-      assert {:ok, %{task_ref: nil, block_numbers: [], sup_pid: ^pid}} = Worker.init(supervisor: self())
-      assert_received :scan
-    end
-  end
-
-  describe "handle_info with :scan" do
-    test "sends shutdown to supervisor" do
-      state = %{task_ref: nil, block_numbers: [], sup_pid: self()}
-      Task.async(fn -> Worker.handle_info(:scan, state) end)
-      assert_receive {_, _, {:terminate, :normal}}
-    end
-
-    test "sends message to self when blocks with invalid consensus are found" do
-      block1 = insert(:block)
-      block2_with_invalid_consensus = insert(:block, parent_hash: block1.hash, consensus: false)
-      _block2 = insert(:block, parent_hash: block1.hash, number: block2_with_invalid_consensus.number)
-      _block3 = insert(:block, parent_hash: block2_with_invalid_consensus.hash)
-
-      block_number = block2_with_invalid_consensus.number
-
-      expected_state = %{task_ref: nil, block_numbers: [block_number], retry_interval: 1}
-      state = %{task_ref: nil, block_numbers: [], retry_interval: 1}
-
-      assert {:noreply, ^expected_state} = Worker.handle_info(:scan, state)
-      assert_receive :push_front_blocks
-    end
-  end
-
-  describe "handle_info with :push_front_blocks" do
-    test "starts a task" do
-      task_sup_pid = start_supervised!({Task.Supervisor, name: TaskSupervisor})
-      start_supervised!({Sequence, [[ranges: [], step: -1], [name: :block_catchup_sequencer]]})
-
-      state = %{task_ref: nil, block_numbers: [1]}
-      assert {:noreply, %{task_ref: task_ref}} = Worker.handle_info(:push_front_blocks, state)
-      assert is_reference(task_ref)
-
-      refute_receive {^task_ref, {:error, :queue_unavailable}}
-      assert_receive {^task_ref, :ok}
-
-      stop_supervised(task_sup_pid)
-    end
-  end
-
-  describe "handle_info with task ref tuple" do
-    test "sends shutdown to supervisor on success" do
-      ref = Process.monitor(self())
-      state = %{task_ref: ref, block_numbers: [], sup_pid: self()}
-      Task.async(fn -> assert Worker.handle_info({ref, :ok}, state) end)
-      assert_receive {_, _, {:terminate, :normal}}
-    end
-
-    test "sends message to self to try again on failure" do
-      ref = Process.monitor(self())
-      state = %{task_ref: ref, block_numbers: [1], sup_pid: self(), retry_interval: 1}
-      expected_state = %{state | task_ref: nil}
-      assert {:noreply, ^expected_state} = Worker.handle_info({ref, {:error, :queue_unavailable}}, state)
-      assert_receive :push_front_blocks
-    end
-  end
-
-  describe "handle_info with failed task" do
-    test "sends message to self to try again" do
-      ref = Process.monitor(self())
-      state = %{task_ref: ref, block_numbers: [1], sup_pid: self(), retry_interval: 1}
-      assert {:noreply, %{task_ref: nil}} = Worker.handle_info({:DOWN, ref, :process, self(), :EXIT}, state)
-      assert_receive :push_front_blocks
-    end
-  end
-end

From 1f05f67fe45d02c98e673446a5f93ebdb2855c74 Mon Sep 17 00:00:00 2001
From: zachdaniel <zachary.s.daniel@gmail.com>
Date: Wed, 27 Mar 2019 18:22:14 -0400
Subject: [PATCH 28/28] feat: verify contracts via an RPC endpoint

---
 CHANGELOG.md                                  |   1 +
 .../api/rpc/contract_controller.ex            |  85 +++++++++
 .../lib/block_scout_web/etherscan.ex          | 166 +++++++++++++++++-
 .../views/api/rpc/contract_view.ex            |   4 +
 .../api/rpc/contract_controller_test.exs      |  97 ++++++++++
 .../smart_contract/compiler_tests.json        |  13 ++
 6 files changed, 365 insertions(+), 1 deletion(-)
 create mode 100644 apps/block_scout_web/test/support/fixture/smart_contract/compiler_tests.json

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2d2255cf86..a046a1a134 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
  - [#1662](https://github.com/poanetwork/blockscout/pull/1662) - allow specifying number of optimization runs
  - [#1654](https://github.com/poanetwork/blockscout/pull/1654) - add decompiled code tab
  - [#1661](https://github.com/poanetwork/blockscout/pull/1661) - try to compile smart contract with the latest evm version
+ - [#1665](https://github.com/poanetwork/blockscout/pull/1665) - Add contract verification RPC endpoint.
 
 ### Fixes
 
diff --git a/apps/block_scout_web/lib/block_scout_web/controllers/api/rpc/contract_controller.ex b/apps/block_scout_web/lib/block_scout_web/controllers/api/rpc/contract_controller.ex
index d2aa6fb07b..146626cce5 100644
--- a/apps/block_scout_web/lib/block_scout_web/controllers/api/rpc/contract_controller.ex
+++ b/apps/block_scout_web/lib/block_scout_web/controllers/api/rpc/contract_controller.ex
@@ -4,6 +4,24 @@ defmodule BlockScoutWeb.API.RPC.ContractController do
   alias BlockScoutWeb.API.RPC.Helpers
   alias Explorer.Chain
   alias Explorer.Chain.SmartContract
+  alias Explorer.SmartContract.Publisher
+
+  def verify(conn, %{"addressHash" => address_hash} = params) do
+    with {:params, {:ok, fetched_params}} <- {:params, fetch_verify_params(params)},
+         {:params, external_libraries} <-
+           {:params, fetch_external_libraries(params)},
+         {:publish, {:ok, smart_contract}} <-
+           {:publish, Publisher.publish(address_hash, fetched_params, external_libraries)},
+         preloaded_smart_contract <- SmartContract.preload_decompiled_smart_contract(smart_contract) do
+      render(conn, :verify, %{contract: preloaded_smart_contract, address_hash: address_hash})
+    else
+      {:publish, _} ->
+        render(conn, :error, error: "Something went wrong while publishing the contract.")
+
+      {:params, {:error, error}} ->
+        render(conn, :error, error: error)
+    end
+  end
 
   def listcontracts(conn, params) do
     with pagination_options <- Helpers.put_pagination_options(%{}, params),
@@ -155,4 +173,71 @@ defmodule BlockScoutWeb.API.RPC.ContractController do
 
     {:contract, result}
   end
+
+  defp fetch_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, "optimization", "optimization")
+    |> required_param(params, "contractSourceCode", "contract_source_code")
+    |> optional_param(params, "evmVersion", "evm_version")
+    |> optional_param(params, "constructorArguments", "constructor_arguments")
+    |> optional_param(params, "optimizationRuns", "optimization_runs")
+    |> parse_optimization_runs()
+  end
+
+  defp parse_optimization_runs({:ok, %{"optimization_runs" => runs} = opts}) when is_bitstring(runs) do
+    {:ok, Map.put(opts, "optimization_runs", 200)}
+  end
+
+  defp parse_optimization_runs({:ok, %{"optimization_runs" => runs} = opts}) when is_integer(runs) do
+    {:ok, opts}
+  end
+
+  defp parse_optimization_runs({:ok, opts}) do
+    {:ok, Map.put(opts, "optimization_runs", 200)}
+  end
+
+  defp parse_optimization_runs(other), do: other
+
+  defp fetch_external_libraries(params) do
+    Enum.reduce(1..5, %{}, fn number, acc ->
+      case Map.fetch(params, "library#{number}Name") do
+        {:ok, library_name} ->
+          library_address = Map.get(params, "library#{number}Address")
+
+          acc
+          |> Map.put("library#{number}_name", library_name)
+          |> Map.put("library#{number}_address", library_address)
+
+        :error ->
+          acc
+      end
+    end)
+  end
+
+  defp required_param({:error, _} = error, _, _, _), do: error
+
+  defp required_param({:ok, map}, params, key, new_key) do
+    case Map.fetch(params, key) do
+      {:ok, value} ->
+        {:ok, Map.put(map, new_key, value)}
+
+      :error ->
+        {:error, "#{key} is required."}
+    end
+  end
+
+  defp optional_param({:error, _} = error, _, _, _), do: error
+
+  defp optional_param({:ok, map}, params, key, new_key) do
+    case Map.fetch(params, key) do
+      {:ok, value} ->
+        {:ok, Map.put(map, new_key, value)}
+
+      :error ->
+        {:ok, map}
+    end
+  end
 end
diff --git a/apps/block_scout_web/lib/block_scout_web/etherscan.ex b/apps/block_scout_web/lib/block_scout_web/etherscan.ex
index 07b7b5056b..d68f0c95c7 100644
--- a/apps/block_scout_web/lib/block_scout_web/etherscan.ex
+++ b/apps/block_scout_web/lib/block_scout_web/etherscan.ex
@@ -328,6 +328,49 @@ defmodule BlockScoutWeb.Etherscan do
     "result" => nil
   }
 
+  @contract_verify_example_value %{
+    "status" => "1",
+    "message" => "OK",
+    "result" => %{
+      "SourceCode" => """
+      pragma solidity >0.4.24;
+
+      contract Test {
+      constructor() public { b = hex"12345678901234567890123456789012"; }
+      event Event(uint indexed a, bytes32 b);
+      event Event2(uint indexed a, bytes32 b);
+      function foo(uint a) public { emit Event(a, b); }
+      bytes32 b;
+      }
+      """,
+      "ABI" => """
+      [{
+      "type":"event",
+      "inputs": [{"name":"a","type":"uint256","indexed":true},{"name":"b","type":"bytes32","indexed":false}],
+      "name":"Event"
+      }, {
+      "type":"event",
+      "inputs": [{"name":"a","type":"uint256","indexed":true},{"name":"b","type":"bytes32","indexed":false}],
+      "name":"Event2"
+      }, {
+      "type":"function",
+      "inputs": [{"name":"a","type":"uint256"}],
+      "name":"foo",
+      "outputs": []
+      }]
+      """,
+      "ContractName" => "Test",
+      "CompilerVersion" => "v0.2.1-2016-01-30-91a6b35",
+      "OptimizationUsed" => "1"
+    }
+  }
+
+  @contract_verify_example_value_error %{
+    "status" => "0",
+    "message" => "There was an error verifying the contract.",
+    "result" => nil
+  }
+
   @contract_getsourcecode_example_value %{
     "status" => "1",
     "message" => "OK",
@@ -1747,6 +1790,126 @@ defmodule BlockScoutWeb.Etherscan do
     ]
   }
 
+  @contract_verify_action %{
+    name: "verify",
+    description: "Verify a contract with its source code and contract creation information.",
+    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: "optimization",
+        placeholder: false,
+        type: "boolean",
+        description: "Whether or not compiler optimizations were enabled."
+      },
+      %{
+        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."
+      },
+      %{
+        key: "evmVersion",
+        placeholder: "evmVersion",
+        type: "string",
+        description: "The EVM version for the contract."
+      },
+      %{
+        key: "optimizationRuns",
+        placeholder: "optimizationRuns",
+        type: "integer",
+        description: "The number of optimization runs used during compilation"
+      },
+      %{
+        key: "library1Name",
+        type: "string",
+        description: "The name of the first library used."
+      },
+      %{
+        key: "library1Address",
+        type: "string",
+        description: "The address of the first library used."
+      },
+      %{
+        key: "library2Name",
+        type: "string",
+        description: "The name of the second library used."
+      },
+      %{
+        key: "library2Address",
+        type: "string",
+        description: "The address of the second library used."
+      },
+      %{
+        key: "library3Name",
+        type: "string",
+        description: "The name of the third library used."
+      },
+      %{
+        key: "library3Address",
+        type: "string",
+        description: "The address of the third library used."
+      },
+      %{
+        key: "library4Name",
+        type: "string",
+        description: "The name of the fourth library used."
+      },
+      %{
+        key: "library4Address",
+        type: "string",
+        description: "The address of the fourth library used."
+      },
+      %{
+        key: "library5Name",
+        type: "string",
+        description: "The name of the fourth library used."
+      },
+      %{
+        key: "library5Address",
+        type: "string",
+        description: "The address of the fourth library used."
+      }
+    ],
+    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.",
@@ -1976,7 +2139,8 @@ defmodule BlockScoutWeb.Etherscan do
     actions: [
       @contract_listcontracts_action,
       @contract_getabi_action,
-      @contract_getsourcecode_action
+      @contract_getsourcecode_action,
+      @contract_verify_action
     ]
   }
 
diff --git a/apps/block_scout_web/lib/block_scout_web/views/api/rpc/contract_view.ex b/apps/block_scout_web/lib/block_scout_web/views/api/rpc/contract_view.ex
index c2c593a313..27e049dfc3 100644
--- a/apps/block_scout_web/lib/block_scout_web/views/api/rpc/contract_view.ex
+++ b/apps/block_scout_web/lib/block_scout_web/views/api/rpc/contract_view.ex
@@ -22,6 +22,10 @@ defmodule BlockScoutWeb.API.RPC.ContractView do
     RPCView.render("error.json", assigns)
   end
 
+  def render("verify.json", %{contract: contract, address_hash: address_hash}) do
+    RPCView.render("show.json", data: prepare_source_code_contract(contract, address_hash))
+  end
+
   defp prepare_source_code_contract(nil, address_hash) do
     %{
       "Address" => to_string(address_hash),
diff --git a/apps/block_scout_web/test/block_scout_web/controllers/api/rpc/contract_controller_test.exs b/apps/block_scout_web/test/block_scout_web/controllers/api/rpc/contract_controller_test.exs
index d299d6bc73..632809863f 100644
--- a/apps/block_scout_web/test/block_scout_web/controllers/api/rpc/contract_controller_test.exs
+++ b/apps/block_scout_web/test/block_scout_web/controllers/api/rpc/contract_controller_test.exs
@@ -1,5 +1,6 @@
 defmodule BlockScoutWeb.API.RPC.ContractControllerTest do
   use BlockScoutWeb.ConnCase
+  alias Explorer.Factory
 
   describe "listcontracts" do
     setup do
@@ -413,4 +414,100 @@ defmodule BlockScoutWeb.API.RPC.ContractControllerTest do
       assert response["message"] == "OK"
     end
   end
+
+  describe "verify" do
+    test "with an address that doesn't exist", %{conn: conn} do
+      contract_code_info = Factory.contract_code_info()
+
+      contract_address = insert(:contract_address, contract_code: contract_code_info.bytecode)
+
+      params = %{
+        "module" => "contract",
+        "action" => "verify",
+        "addressHash" => to_string(contract_address.hash),
+        "name" => contract_code_info.name,
+        "compilerVersion" => contract_code_info.version,
+        "optimization" => contract_code_info.optimized,
+        "contractSourceCode" => contract_code_info.source_code
+      }
+
+      response =
+        conn
+        |> get("/api", params)
+        |> json_response(200)
+
+      expected_result = %{
+        "Address" => to_string(contract_address.hash),
+        "SourceCode" => contract_code_info.source_code,
+        "ABI" => Jason.encode!(contract_code_info.abi),
+        "ContractName" => contract_code_info.name,
+        "CompilerVersion" => contract_code_info.version,
+        "DecompiledSourceCode" => "Contract source code not decompiled.",
+        "DecompilerVersion" => "",
+        "OptimizationUsed" => "0"
+      }
+
+      assert response["status"] == "1"
+      assert response["result"] == expected_result
+      assert response["message"] == "OK"
+    end
+
+    test "with external libraries", %{conn: conn} do
+      contract_data =
+        "#{File.cwd!()}/test/support/fixture/smart_contract/compiler_tests.json"
+        |> File.read!()
+        |> Jason.decode!()
+        |> List.first()
+
+      %{
+        "compiler_version" => compiler_version,
+        "external_libraries" => external_libraries,
+        "name" => name,
+        "optimize" => optimize,
+        "contract" => contract_source_code,
+        "expected_bytecode" => expected_bytecode
+      } = contract_data
+
+      contract_address = insert(:contract_address, contract_code: "0x" <> expected_bytecode)
+
+      params = %{
+        "module" => "contract",
+        "action" => "verify",
+        "addressHash" => to_string(contract_address.hash),
+        "name" => name,
+        "compilerVersion" => compiler_version,
+        "optimization" => optimize,
+        "contractSourceCode" => contract_source_code
+      }
+
+      params_with_external_libraries =
+        external_libraries
+        |> Enum.with_index()
+        |> Enum.reduce(params, fn {{name, address}, index}, acc ->
+          name_key = "library#{index + 1}Name"
+          address_key = "library#{index + 1}Address"
+
+          acc
+          |> Map.put(name_key, name)
+          |> Map.put(address_key, address)
+        end)
+
+      response =
+        conn
+        |> get("/api", params_with_external_libraries)
+        |> json_response(200)
+
+      assert response["status"] == "1"
+      assert response["message"] == "OK"
+
+      result = response["result"]
+
+      assert result["Address"] == to_string(contract_address.hash)
+      assert result["SourceCode"] == contract_source_code
+      assert result["ContractName"] == name
+      assert result["DecompiledSourceCode"] == "Contract source code not decompiled."
+      assert result["DecompilerVersion"] == ""
+      assert result["OptimizationUsed"] == "1"
+    end
+  end
 end
diff --git a/apps/block_scout_web/test/support/fixture/smart_contract/compiler_tests.json b/apps/block_scout_web/test/support/fixture/smart_contract/compiler_tests.json
new file mode 100644
index 0000000000..f74cd3d707
--- /dev/null
+++ b/apps/block_scout_web/test/support/fixture/smart_contract/compiler_tests.json
@@ -0,0 +1,13 @@
+[
+    {
+      "compiler_version": "v0.4.11+commit.68ef5810",
+      "contract": "pragma solidity ^0.4.11;\n/**\n * @title ERC20Basic\n * @dev Simpler version of ERC20 interface\n * @dev see https://github.com/ethereum/EIPs/issues/179\n */\ncontract ERC20Basic {\n  uint256 public totalSupply;\n  function balanceOf(address who) public constant returns (uint256);\n  function transfer(address to, uint256 value) public returns (bool);\n  event Transfer(address indexed from, address indexed to, uint256 value);\n}\n/**\n * @title Ownable\n * @dev The Ownable contract has an owner address, and provides basic authorization control\n * functions, this simplifies the implementation of \"user permissions\".\n */\ncontract Ownable {\n  address public owner;\n  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);\n  /**\n   * @dev The Ownable constructor sets the original `owner` of the contract to the sender\n   * account.\n   */\n  function Ownable() {\n    owner = msg.sender;\n  }\n  /**\n   * @dev Throws if called by any account other than the owner.\n   */\n  modifier onlyOwner() {\n    require(msg.sender == owner);\n    _;\n  }\n  /**\n   * @dev Allows the current owner to transfer control of the contract to a newOwner.\n   * @param newOwner The address to transfer ownership to.\n   */\n  function transferOwnership(address newOwner) onlyOwner public {\n    require(newOwner != address(0));\n    OwnershipTransferred(owner, newOwner);\n    owner = newOwner;\n  }\n}\n// Temporarily have SafeMath here until all contracts have been migrated to SafeMathLib version from OpenZeppelin\n/**\n * Math operations with safety checks\n */\ncontract SafeMath {\n  function safeMul(uint a, uint b) internal returns (uint) {\n    uint c = a * b;\n    assert(a == 0 || c / a == b);\n    return c;\n  }\n  function safeDiv(uint a, uint b) internal returns (uint) {\n    assert(b > 0);\n    uint c = a / b;\n    assert(a == b * c + a % b);\n    return c;\n  }\n  function safeSub(uint a, uint b) internal returns (uint) {\n    assert(b <= a);\n    return a - b;\n  }\n  function safeAdd(uint a, uint b) internal returns (uint) {\n    uint c = a + b;\n    assert(c>=a && c>=b);\n    return c;\n  }\n  function max64(uint64 a, uint64 b) internal constant returns (uint64) {\n    return a >= b ? a : b;\n  }\n  function min64(uint64 a, uint64 b) internal constant returns (uint64) {\n    return a < b ? a : b;\n  }\n  function max256(uint256 a, uint256 b) internal constant returns (uint256) {\n    return a >= b ? a : b;\n  }\n  function min256(uint256 a, uint256 b) internal constant returns (uint256) {\n    return a < b ? a : b;\n  }\n}\n/**\n * This smart contract code is Copyright 2017 TokenMarket Ltd. For more information see https://tokenmarket.net\n *\n * Licensed under the Apache License, version 2.0: https://github.com/TokenMarketNet/ico/blob/master/LICENSE.txt\n */\n/**\n * This smart contract code is Copyright 2017 TokenMarket Ltd. For more information see https://tokenmarket.net\n *\n * Licensed under the Apache License, version 2.0: https://github.com/TokenMarketNet/ico/blob/master/LICENSE.txt\n */\n/**\n * @title ERC20 interface\n * @dev see https://github.com/ethereum/EIPs/issues/20\n */\ncontract ERC20 is ERC20Basic {\n  function allowance(address owner, address spender) public constant returns (uint256);\n  function transferFrom(address from, address to, uint256 value) public returns (bool);\n  function approve(address spender, uint256 value) public returns (bool);\n  event Approval(address indexed owner, address indexed spender, uint256 value);\n}\n/**\n * Standard ERC20 token with Short Hand Attack and approve() race condition mitigation.\n *\n * Based on code by FirstBlood:\n * https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol\n */\ncontract StandardToken is ERC20, SafeMath {\n  /* Token supply got increased and a new owner received these tokens */\n  event Minted(address receiver, uint amount);\n  /* Actual balances of token holders */\n  mapping(address => uint) balances;\n  /* approve() allowances */\n  mapping (address => mapping (address => uint)) allowed;\n  /* Interface declaration */\n  function isToken() public constant returns (bool weAre) {\n    return true;\n  }\n  function transfer(address _to, uint _value) returns (bool success) {\n    balances[msg.sender] = safeSub(balances[msg.sender], _value);\n    balances[_to] = safeAdd(balances[_to], _value);\n    Transfer(msg.sender, _to, _value);\n    return true;\n  }\n  function transferFrom(address _from, address _to, uint _value) returns (bool success) {\n    uint _allowance = allowed[_from][msg.sender];\n    balances[_to] = safeAdd(balances[_to], _value);\n    balances[_from] = safeSub(balances[_from], _value);\n    allowed[_from][msg.sender] = safeSub(_allowance, _value);\n    Transfer(_from, _to, _value);\n    return true;\n  }\n  function balanceOf(address _owner) constant returns (uint balance) {\n    return balances[_owner];\n  }\n  function approve(address _spender, uint _value) returns (bool success) {\n    // To change the approve amount you first have to reduce the addresses`\n    //  allowance to zero by calling `approve(_spender, 0)` if it is not\n    //  already 0 to mitigate the race condition described here:\n    //  https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n    if ((_value != 0) && (allowed[msg.sender][_spender] != 0)) throw;\n    allowed[msg.sender][_spender] = _value;\n    Approval(msg.sender, _spender, _value);\n    return true;\n  }\n  function allowance(address _owner, address _spender) constant returns (uint remaining) {\n    return allowed[_owner][_spender];\n  }\n}\n/**\n * This smart contract code is Copyright 2017 TokenMarket Ltd. For more information see https://tokenmarket.net\n *\n * Licensed under the Apache License, version 2.0: https://github.com/TokenMarketNet/ico/blob/master/LICENSE.txt\n */\n/**\n * This smart contract code is Copyright 2017 TokenMarket Ltd. For more information see https://tokenmarket.net\n *\n * Licensed under the Apache License, version 2.0: https://github.com/TokenMarketNet/ico/blob/master/LICENSE.txt\n */\n/**\n * Upgrade agent interface inspired by Lunyr.\n *\n * Upgrade agent transfers tokens to a new contract.\n * Upgrade agent itself can be the token contract, or just a middle man contract doing the heavy lifting.\n */\ncontract UpgradeAgent {\n  uint public originalSupply;\n  /** Interface marker */\n  function isUpgradeAgent() public constant returns (bool) {\n    return true;\n  }\n  function upgradeFrom(address _from, uint256 _value) public;\n}\n/**\n * A token upgrade mechanism where users can opt-in amount of tokens to the next smart contract revision.\n *\n * First envisioned by Golem and Lunyr projects.\n */\ncontract UpgradeableToken is StandardToken {\n  /** Contract / person who can set the upgrade path. This can be the same as team multisig wallet, as what it is with its default value. */\n  address public upgradeMaster;\n  /** The next contract where the tokens will be migrated. */\n  UpgradeAgent public upgradeAgent;\n  /** How many tokens we have upgraded by now. */\n  uint256 public totalUpgraded;\n  /**\n   * Upgrade states.\n   *\n   * - NotAllowed: The child contract has not reached a condition where the upgrade can bgun\n   * - WaitingForAgent: Token allows upgrade, but we don't have a new agent yet\n   * - ReadyToUpgrade: The agent is set, but not a single token has been upgraded yet\n   * - Upgrading: Upgrade agent is set and the balance holders can upgrade their tokens\n   *\n   */\n  enum UpgradeState {Unknown, NotAllowed, WaitingForAgent, ReadyToUpgrade, Upgrading}\n  /**\n   * Somebody has upgraded some of his tokens.\n   */\n  event Upgrade(address indexed _from, address indexed _to, uint256 _value);\n  /**\n   * New upgrade agent available.\n   */\n  event UpgradeAgentSet(address agent);\n  /**\n   * Do not allow construction without upgrade master set.\n   */\n  function UpgradeableToken(address _upgradeMaster) {\n    upgradeMaster = _upgradeMaster;\n  }\n  /**\n   * Allow the token holder to upgrade some of their tokens to a new contract.\n   */\n  function upgrade(uint256 value) public {\n      UpgradeState state = getUpgradeState();\n      if(!(state == UpgradeState.ReadyToUpgrade || state == UpgradeState.Upgrading)) {\n        // Called in a bad state\n        throw;\n      }\n      // Validate input value.\n      if (value == 0) throw;\n      balances[msg.sender] = safeSub(balances[msg.sender], value);\n      // Take tokens out from circulation\n      totalSupply = safeSub(totalSupply, value);\n      totalUpgraded = safeAdd(totalUpgraded, value);\n      // Upgrade agent reissues the tokens\n      upgradeAgent.upgradeFrom(msg.sender, value);\n      Upgrade(msg.sender, upgradeAgent, value);\n  }\n  /**\n   * Set an upgrade agent that handles\n   */\n  function setUpgradeAgent(address agent) external {\n      if(!canUpgrade()) {\n        // The token is not yet in a state that we could think upgrading\n        throw;\n      }\n      if (agent == 0x0) throw;\n      // Only a master can designate the next agent\n      if (msg.sender != upgradeMaster) throw;\n      // Upgrade has already begun for an agent\n      if (getUpgradeState() == UpgradeState.Upgrading) throw;\n      upgradeAgent = UpgradeAgent(agent);\n      // Bad interface\n      if(!upgradeAgent.isUpgradeAgent()) throw;\n      // Make sure that token supplies match in source and target\n      if (upgradeAgent.originalSupply() != totalSupply) throw;\n      UpgradeAgentSet(upgradeAgent);\n  }\n  /**\n   * Get the state of the token upgrade.\n   */\n  function getUpgradeState() public constant returns(UpgradeState) {\n    if(!canUpgrade()) return UpgradeState.NotAllowed;\n    else if(address(upgradeAgent) == 0x00) return UpgradeState.WaitingForAgent;\n    else if(totalUpgraded == 0) return UpgradeState.ReadyToUpgrade;\n    else return UpgradeState.Upgrading;\n  }\n  /**\n   * Change the upgrade master.\n   *\n   * This allows us to set a new owner for the upgrade mechanism.\n   */\n  function setUpgradeMaster(address master) public {\n      if (master == 0x0) throw;\n      if (msg.sender != upgradeMaster) throw;\n      upgradeMaster = master;\n  }\n  /**\n   * Child contract can enable to provide the condition when the upgrade can begun.\n   */\n  function canUpgrade() public constant returns(bool) {\n     return true;\n  }\n}\n/**\n * This smart contract code is Copyright 2017 TokenMarket Ltd. For more information see https://tokenmarket.net\n *\n * Licensed under the Apache License, version 2.0: https://github.com/TokenMarketNet/ico/blob/master/LICENSE.txt\n */\n/**\n * Define interface for releasing the token transfer after a successful crowdsale.\n */\ncontract ReleasableToken is ERC20, Ownable {\n  /* The finalizer contract that allows unlift the transfer limits on this token */\n  address public releaseAgent;\n  /** A crowdsale contract can release us to the wild if ICO success. If false we are are in transfer lock up period.*/\n  bool public released = false;\n  /** Map of agents that are allowed to transfer tokens regardless of the lock down period. These are crowdsale contracts and possible the team multisig itself. */\n  mapping (address => bool) public transferAgents;\n  /**\n   * Limit token transfer until the crowdsale is over.\n   *\n   */\n  modifier canTransfer(address _sender) {\n    if(!released) {\n        if(!transferAgents[_sender]) {\n            throw;\n        }\n    }\n    _;\n  }\n  /**\n   * Set the contract that can call release and make the token transferable.\n   *\n   * Design choice. Allow reset the release agent to fix fat finger mistakes.\n   */\n  function setReleaseAgent(address addr) onlyOwner inReleaseState(false) public {\n    // We don't do interface check here as we might want to a normal wallet address to act as a release agent\n    releaseAgent = addr;\n  }\n  /**\n   * Owner can allow a particular address (a crowdsale contract) to transfer tokens despite the lock up period.\n   */\n  function setTransferAgent(address addr, bool state) onlyOwner inReleaseState(false) public {\n    transferAgents[addr] = state;\n  }\n  /**\n   * One way function to release the tokens to the wild.\n   *\n   * Can be called only from the release agent that is the final ICO contract. It is only called if the crowdsale has been success (first milestone reached).\n   */\n  function releaseTokenTransfer() public onlyReleaseAgent {\n    released = true;\n  }\n  /** The function can be called only before or after the tokens have been releasesd */\n  modifier inReleaseState(bool releaseState) {\n    if(releaseState != released) {\n        throw;\n    }\n    _;\n  }\n  /** The function can be called only by a whitelisted release agent. */\n  modifier onlyReleaseAgent() {\n    if(msg.sender != releaseAgent) {\n        throw;\n    }\n    _;\n  }\n  function transfer(address _to, uint _value) canTransfer(msg.sender) returns (bool success) {\n    // Call StandardToken.transfer()\n   return super.transfer(_to, _value);\n  }\n  function transferFrom(address _from, address _to, uint _value) canTransfer(_from) returns (bool success) {\n    // Call StandardToken.transferForm()\n    return super.transferFrom(_from, _to, _value);\n  }\n}\n/**\n * This smart contract code is Copyright 2017 TokenMarket Ltd. For more information see https://tokenmarket.net\n *\n * Licensed under the Apache License, version 2.0: https://github.com/TokenMarketNet/ico/blob/master/LICENSE.txt\n */\n/**\n * This smart contract code is Copyright 2017 TokenMarket Ltd. For more information see https://tokenmarket.net\n *\n * Licensed under the Apache License, version 2.0: https://github.com/TokenMarketNet/ico/blob/master/LICENSE.txt\n */\n/**\n * Safe unsigned safe math.\n *\n * https://blog.aragon.one/library-driven-development-in-solidity-2bebcaf88736#.750gwtwli\n *\n * Originally from https://raw.githubusercontent.com/AragonOne/zeppelin-solidity/master/contracts/SafeMathLib.sol\n *\n * Maintained here until merged to mainline zeppelin-solidity.\n *\n */\nlibrary SafeMathLibExt {\n  function times(uint a, uint b) returns (uint) {\n    uint c = a * b;\n    assert(a == 0 || c / a == b);\n    return c;\n  }\n  function divides(uint a, uint b) returns (uint) {\n    assert(b > 0);\n    uint c = a / b;\n    assert(a == b * c + a % b);\n    return c;\n  }\n  function minus(uint a, uint b) returns (uint) {\n    assert(b <= a);\n    return a - b;\n  }\n  function plus(uint a, uint b) returns (uint) {\n    uint c = a + b;\n    assert(c>=a);\n    return c;\n  }\n}\n/**\n * A token that can increase its supply by another contract.\n *\n * This allows uncapped crowdsale by dynamically increasing the supply when money pours in.\n * Only mint agents, contracts whitelisted by owner, can mint new tokens.\n *\n */\ncontract MintableTokenExt is StandardToken, Ownable {\n  using SafeMathLibExt for uint;\n  bool public mintingFinished = false;\n  /** List of agents that are allowed to create new tokens */\n  mapping (address => bool) public mintAgents;\n  event MintingAgentChanged(address addr, bool state  );\n  struct ReservedTokensData {\n    uint inTokens;\n    uint inPercentage;\n  }\n  mapping (address => ReservedTokensData) public reservedTokensList;\n  address[] public reservedTokensDestinations;\n  uint public reservedTokensDestinationsLen = 0;\n  function setReservedTokensList(address addr, uint inTokens, uint inPercentage) onlyOwner {\n    reservedTokensDestinations.push(addr);\n    reservedTokensDestinationsLen++;\n    reservedTokensList[addr] = ReservedTokensData({inTokens:inTokens, inPercentage:inPercentage});\n  }\n  function getReservedTokensListValInTokens(address addr) constant returns (uint inTokens) {\n    return reservedTokensList[addr].inTokens;\n  }\n  function getReservedTokensListValInPercentage(address addr) constant returns (uint inPercentage) {\n    return reservedTokensList[addr].inPercentage;\n  }\n  function setReservedTokensListMultiple(address[] addrs, uint[] inTokens, uint[] inPercentage) onlyOwner {\n    for (uint iterator = 0; iterator < addrs.length; iterator++) {\n      setReservedTokensList(addrs[iterator], inTokens[iterator], inPercentage[iterator]);\n    }\n  }\n  /**\n   * Create new tokens and allocate them to an address..\n   *\n   * Only callably by a crowdsale contract (mint agent).\n   */\n  function mint(address receiver, uint amount) onlyMintAgent canMint public {\n    totalSupply = totalSupply.plus(amount);\n    balances[receiver] = balances[receiver].plus(amount);\n    // This will make the mint transaction apper in EtherScan.io\n    // We can remove this after there is a standardized minting event\n    Transfer(0, receiver, amount);\n  }\n  /**\n   * Owner can allow a crowdsale contract to mint new tokens.\n   */\n  function setMintAgent(address addr, bool state) onlyOwner canMint public {\n    mintAgents[addr] = state;\n    MintingAgentChanged(addr, state);\n  }\n  modifier onlyMintAgent() {\n    // Only crowdsale contracts are allowed to mint new tokens\n    if(!mintAgents[msg.sender]) {\n        throw;\n    }\n    _;\n  }\n  /** Make sure we are not done yet. */\n  modifier canMint() {\n    if(mintingFinished) throw;\n    _;\n  }\n}\n/**\n * A crowdsaled token.\n *\n * An ERC-20 token designed specifically for crowdsales with investor protection and further development path.\n *\n * - The token transfer() is disabled until the crowdsale is over\n * - The token contract gives an opt-in upgrade path to a new contract\n * - The same token can be part of several crowdsales through approve() mechanism\n * - The token can be capped (supply set in the constructor) or uncapped (crowdsale contract can mint new tokens)\n *\n */\ncontract CrowdsaleTokenExt is ReleasableToken, MintableTokenExt, UpgradeableToken {\n  /** Name and symbol were updated. */\n  event UpdatedTokenInformation(string newName, string newSymbol);\n  string public name;\n  string public symbol;\n  uint public decimals;\n  /* Minimum ammount of tokens every buyer can buy. */\n  uint public minCap;\n  /**\n   * Construct the token.\n   *\n   * This token must be created through a team multisig wallet, so that it is owned by that wallet.\n   *\n   * @param _name Token name\n   * @param _symbol Token symbol - should be all caps\n   * @param _initialSupply How many tokens we start with\n   * @param _decimals Number of decimal places\n   * @param _mintable Are new tokens created over the crowdsale or do we distribute only the initial supply? Note that when the token becomes transferable the minting always ends.\n   */\n  function CrowdsaleTokenExt(string _name, string _symbol, uint _initialSupply, uint _decimals, bool _mintable, uint _globalMinCap)\n    UpgradeableToken(msg.sender) {\n    // Create any address, can be transferred\n    // to team multisig via changeOwner(),\n    // also remember to call setUpgradeMaster()\n    owner = msg.sender;\n    name = _name;\n    symbol = _symbol;\n    totalSupply = _initialSupply;\n    decimals = _decimals;\n    minCap = _globalMinCap;\n    // Create initially all balance on the team multisig\n    balances[owner] = totalSupply;\n    if(totalSupply > 0) {\n      Minted(owner, totalSupply);\n    }\n    // No more new supply allowed after the token creation\n    if(!_mintable) {\n      mintingFinished = true;\n      if(totalSupply == 0) {\n        throw; // Cannot create a token without supply and no minting\n      }\n    }\n  }\n  /**\n   * When token is released to be transferable, enforce no new tokens can be created.\n   */\n  function releaseTokenTransfer() public onlyReleaseAgent {\n    mintingFinished = true;\n    super.releaseTokenTransfer();\n  }\n  /**\n   * Allow upgrade agent functionality kick in only if the crowdsale was success.\n   */\n  function canUpgrade() public constant returns(bool) {\n    return released && super.canUpgrade();\n  }\n  /**\n   * Owner can update token information here.\n   *\n   * It is often useful to conceal the actual token association, until\n   * the token operations, like central issuance or reissuance have been completed.\n   *\n   * This function allows the token owner to rename the token after the operations\n   * have been completed and then point the audience to use the token contract.\n   */\n  function setTokenInformation(string _name, string _symbol) onlyOwner {\n    name = _name;\n    symbol = _symbol;\n    UpdatedTokenInformation(name, symbol);\n  }\n}",
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+      "external_libraries": {
+        "SafeMathLibExt": "0x54ca5a7c536dbed5897b78d30a93dcd0e46fbdac"
+      },
+      "name": "CrowdsaleTokenExt",
+      "optimize": true
+    }
+  ]
+  
\ No newline at end of file