{
  "manageEntity": {
    "action": "Save",
    "entityId": "1173387528",
    "entityType": "Track",
    "nonce": "0xedc87d00c7b61af22c18f9cbe9af69fe7ebaedd7f1ac94698415867fa5492249",
    "signature": "0x899b3bfa310dec1a39253890da426e3c25f09b36ec2457754342441e9202c4ca0539368567d5d774cd0109ec5aa73abdc462e7b4abf47811de1a9a2038f3374f1c",
    "signer": "0x5D012C880480A2E1ab4345f6F374CFf73e040331",
    "userId": "10449019"
  }
}