{
  "manageEntity": {
    "action": "Save",
    "entityId": "472676880",
    "entityType": "Track",
    "nonce": "0xbcd8e9fa4228b90c6625a09e98dbeebac7a3dc1b687b9386e8ab871709663c24",
    "signature": "0xf083954c2bdca663758875645593901185479da6785974dda6f7c2c84494b7a262694fa2dc0dd7721836d37c07d1ec367f34e8a500a10d0caf34a420d7fb170c1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}