{
  "manageEntity": {
    "action": "Save",
    "entityId": "1957896021",
    "entityType": "Track",
    "nonce": "0x2a967ed4ed0383b3c2fee56db3d1fd9dcdb9d611946087cd8ca67ee751335cf8",
    "signature": "0xc213a8ce9113703933e1cfe730a4d55a00060bba0cf8a39219a4d7b7e7465baa5aec9fa6cc8931fb468d098aa9d45a76c61f0e76c59591fdea2c50d63231e26e1b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}