jm Dmì/gþFÝß¾qV¿§|~Ñnß+wµÒLBy looking at 6d byte you can get all Memo related actions from the blockchain (with a bit of 'false positives' that you will later filter out).
https://whatsonchain.com/tx/8e1f8eafbc65fd8247e5f87219ef118e77029442fc2beab237bc866e137ca884