{
  "manageEntity": {
    "action": "Save",
    "entityId": "1896389841",
    "entityType": "Track",
    "nonce": "0x5404d677e753491b342cec4f2b35c7c1bb187c30b25effe7431b980c27087722",
    "signature": "0x1568aff95a4a9b4dfcba431cffb423edf06561d204bb11fa1b89d6dcf791f85574e4abd61465cc5d34ef4f109b30ec4f0f9d84682382fed2f43a6d17018190701b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}