{
  "manageEntity": {
    "action": "Save",
    "entityId": "854789",
    "entityType": "Track",
    "nonce": "0xb1aa71be0a459e62138d156702828847f1c0cc1e51d557bce8c4485b8f76c9a7",
    "signature": "0xb418e96845db2994388afef0d5d3e505572c20aa0ff8ed5dd22d5f2e6f5729365bd2c8eec0916c8161f63707dc8704ced8b5affe526bb55b82b1c4bb919d37211c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}