{
  "manageEntity": {
    "action": "Save",
    "entityId": "288379",
    "entityType": "Track",
    "nonce": "0x967ef558ffdaa3e5d1bd58642648757a56a6d06d1ff3fedd1a722f0ae3ecfca9",
    "signature": "0x8583a5668dbf7af40c4c4dbbdd9db44115591aba858a9cf5b3a3c447a6e445b92b05af4a88fc9db95d9b269ab0d9e37783049cb484712579011ee638cd39b7291c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}