diff --git a/app/jobs/update_address_op_return_job.rb b/app/jobs/update_address_op_return_job.rb
new file mode 100644
index 0000000..8fcd79e
--- /dev/null
+++ b/app/jobs/update_address_op_return_job.rb
@@ -0,0 +1,57 @@
+class UpdateAddressOpReturnJob < ApplicationJob
+  queue_as :default
+
+  OP_RETURN_RE = /\AOP_RETURN ([0-9a-fA-F]*)\z/.freeze
+  MIN_CONFIRMATIONS = 1
+
+  def perform(address)
+    return unless address.update_op_return?
+
+    all_tx_datas = JSON.parse %x[dash-cli listtransactions "*" 100]
+
+    tx_datas = all_tx_datas.select do |tx_data|
+      tx_data['address'] == address.value &&
+        tx_data['category'] == 'send' &&
+        tx_data['confirmations'] >= MIN_CONFIRMATIONS
+    end
+
+    tx_ids = tx_datas.map { |tx_data| tx_data['txid'] }.uniq
+
+    tx_full_datas = tx_ids.map do |tx_id|
+      JSON.parse %x[dash-cli getrawtransaction #{tx_id} 1]
+    end
+
+    all_tx_vouts = tx_full_datas.flat_map do |tx_full_data|
+      tx_full_data['vout'].map do |vout|
+        tx_full_data.merge 'vout' => vout
+      end
+    end
+
+    tx_vouts = all_tx_vouts.select do |tx_vout|
+      tx_vout['vout']['scriptPubKey'] != nil &&
+        tx_vout['vout']['scriptPubKey']['asm'] != nil &&
+        tx_vout['vout']['scriptPubKey']['asm'].match?(OP_RETURN_RE)
+    end
+
+    if tx_vouts.empty?
+      address.update! op_return_value: nil,
+                      op_return_updated_at: Time.zone.now
+      return
+    end
+
+    actual_tx_vout = tx_vouts.sort_by do |tx_vout|
+      [
+        tx_vout['confirmations'],
+        -tx_vout['vout']['n'],
+      ]
+    end.first
+
+    asm = actual_tx_vout['vout']['scriptPubKey']['asm']
+    match = OP_RETURN_RE.match asm
+    hex = match[1]
+    ascii = [hex].pack 'H*'
+
+    address.update! op_return_value: ascii,
+                    op_return_updated_at: Time.zone.now
+  end
+end
diff --git a/test/jobs/update_address_op_return_job_test.rb b/test/jobs/update_address_op_return_job_test.rb
new file mode 100644
index 0000000..1d7ed38
--- /dev/null
+++ b/test/jobs/update_address_op_return_job_test.rb
@@ -0,0 +1,7 @@
+require "test_helper"
+
+class UpdateAddressOpReturnJobTest < ActiveJob::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end