EVENT_JSON:{"standard":"nep171","version":"nft-1.0.0","event":"nft_transfer","data":[{"old_owner_id":"0a6b6ccd2cc750a8a536a432c44d3edc5fc34f5ba3563dd37761d64bf1283e85","new_owner_id":"9a639be59c92f25da3089e64294657c6bdea1b88ae45dd7be177a89441eeccea","token_ids":["521"]}]}