{
  "manageEntity": {
    "action": "Save",
    "entityId": "840434213",
    "entityType": "Track",
    "nonce": "0x0bef8dc2fa680182f9250eb71f76c0c9bd2e3a24263816ea14c5f67f79a8ec2a",
    "signature": "0xa0be8cfea532608a57eb33c9ff20250565a0743895860c501e983bf311889ec30bd9aaec6a7a3f1bde1595b0e134fe5adec513ea2a8252d1b7e83d80f7a9cb021b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}