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 cb23687cda..e9b01836c4 100644
--- a/apps/explorer/lib/explorer/smart_contract/solidity/code_compiler.ex
+++ b/apps/explorer/lib/explorer/smart_contract/solidity/code_compiler.ex
@@ -61,6 +61,8 @@ defmodule Explorer.SmartContract.Solidity.CodeCompiler do
       }
   """
   def run(name, compiler_version, code, optimize, external_libs \\ %{}) do
+    external_libs_string = Jason.encode!(external_libs)
+
     {response, _status} =
       System.cmd(
         "node",
@@ -69,16 +71,15 @@ defmodule Explorer.SmartContract.Solidity.CodeCompiler do
           code,
           compiler_version,
           optimize_value(optimize),
-          @new_contract_name
+          @new_contract_name,
+          external_libs_string
         ]
       )
 
     with {:ok, contracts} <- Jason.decode(response),
          %{"abi" => abi, "evm" => %{"deployedBytecode" => %{"object" => bytecode}}} <-
            get_contract_info(contracts, name) do
-      bytecode_with_libraries = add_library_addresses(bytecode, external_libs)
-
-      {:ok, %{"abi" => abi, "bytecode" => bytecode_with_libraries, "name" => name}}
+      {:ok, %{"abi" => abi, "bytecode" => bytecode, "name" => name}}
     else
       {:error, %Jason.DecodeError{}} ->
         {:error, :compilation}
@@ -105,16 +106,6 @@ defmodule Explorer.SmartContract.Solidity.CodeCompiler do
     end
   end
 
-  defp add_library_addresses(bytecode, external_libs) do
-    Enum.reduce(external_libs, bytecode, fn {library_name, address}, acc ->
-      placeholder = String.replace(@new_contract_name, ".", "\.") <> ":" <> library_name
-      regex = Regex.compile!("_+#{placeholder}_+")
-      address = String.replace(address, "0x", "")
-
-      String.replace(acc, regex, address)
-    end)
-  end
-
   def parse_error(%{"error" => error}), do: {:error, [error]}
   def parse_error(%{"errors" => errors}), do: {:error, errors}
   def parse_error({:error, _} = error), do: error
diff --git a/apps/explorer/priv/compile_solc.js b/apps/explorer/priv/compile_solc.js
index 17c2c8bd8e..3c4bd0b78b 100755
--- a/apps/explorer/priv/compile_solc.js
+++ b/apps/explorer/priv/compile_solc.js
@@ -6,6 +6,7 @@ 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 compiled_code = solc.loadRemoteVersion(version, function (err, solcSnapshot) {
   if (err) {
@@ -24,6 +25,9 @@ var compiled_code = solc.loadRemoteVersion(version, function (err, solcSnapshot)
           enabled: optimize == '1',
           runs: 200
         },
+        libraries: {
+          [newContractName]: externalLibraries
+        },
         outputSelection: {
           '*': {
             '*': ['*']
diff --git a/apps/explorer/priv/repo/migrations/20190208113202_add_unique_index_to_rewards.exs b/apps/explorer/priv/repo/migrations/20190208113202_add_unique_index_to_rewards.exs
new file mode 100644
index 0000000000..cd306c7977
--- /dev/null
+++ b/apps/explorer/priv/repo/migrations/20190208113202_add_unique_index_to_rewards.exs
@@ -0,0 +1,12 @@
+defmodule Explorer.Repo.Migrations.AddUniqueIndexToRewards do
+  use Ecto.Migration
+
+  def change do
+    create(
+      unique_index(
+        :block_rewards,
+        [:address_hash, :block_hash, :address_type]
+      )
+    )
+  end
+end
diff --git a/apps/indexer/lib/indexer/block/reward/fetcher.ex b/apps/indexer/lib/indexer/block/reward/fetcher.ex
index 7e89166c74..0c190f9719 100644
--- a/apps/indexer/lib/indexer/block/reward/fetcher.ex
+++ b/apps/indexer/lib/indexer/block/reward/fetcher.ex
@@ -177,14 +177,18 @@ defmodule Indexer.Block.Reward.Fetcher do
       |> Enum.map(& &1.block_hash)
       |> Chain.gas_payment_by_block_hash()
 
-    Enum.map(beneficiaries_params, fn %{block_hash: block_hash} = beneficiary ->
-      case gas_payment_by_block_hash do
-        %{^block_hash => gas_payment} ->
-          {:ok, minted} = Wei.cast(beneficiary.reward)
-          %{beneficiary | reward: Wei.sum(minted, gas_payment)}
-
-        _ ->
-          beneficiary
+    Enum.map(beneficiaries_params, fn %{block_hash: block_hash, address_type: address_type} = beneficiary ->
+      if address_type == :validator do
+        case gas_payment_by_block_hash do
+          %{^block_hash => gas_payment} ->
+            {:ok, minted} = Wei.cast(beneficiary.reward)
+            %{beneficiary | reward: Wei.sum(minted, gas_payment)}
+
+          _ ->
+            beneficiary
+        end
+      else
+        beneficiary
       end
     end)
   end