Memo transaction

Post memo 04/22/19 update: https://memo.cash/post/1f8afb31490311fa912d3fca427cc1477dfca7031efe63a19bf59aeb17af969e
Reply to memo e68dbaddbcfcc660d91d60625afe2aa2e3312e863fcf7380611bc8d0ac8a430e