{
  "manageEntity": {
    "action": "Save",
    "entityId": "615107",
    "entityType": "Track",
    "nonce": "0x6db69c48c7b1d5e7d2a4aaedf476e97ff7e33bf4275f3a4214de91ea99f340f4",
    "signature": "0x01e1d493c43387b58ac9fdfd5ac6666868b4ea78165d2fa7d84bcfe90b0cf0516124b64e315683f25b39ec2bfd35fed814bfd985ac204289bc07fbc12081e6291c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}