{
  "manageEntity": {
    "action": "Save",
    "entityId": "783901",
    "entityType": "Track",
    "nonce": "0x097ddc67b5df516716b4474592455b79cb9bccd70312fd9529ee4896033b372e",
    "signature": "0xb74075901e1396c486304af77fa514e0b8618cb9c9df272b6fa0ca15ee2ca3a03d6337485624c957e193c037f69c987156319bd1d7b85a72c70967764bc6001c1c",
    "signer": "0xD967b68365738013c9197659aAb46EB73a488080",
    "userId": "488430169"
  }
}