{
  "manageEntity": {
    "action": "Save",
    "entityId": "865937354",
    "entityType": "Track",
    "nonce": "0x3cdc28db88f90b11bc14933dea0820baa188019161cd8085f70ffeb45bf405eb",
    "signature": "0x02dc72bbd18e51b5b669886ac7d719992126f05860d243ce581efa42b65a72d969af1d79b98af44cd174e86aaa6c6947c3c95815d8aa9868990b8be9ecc7104e1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}