{
  "manageEntity": {
    "action": "Save",
    "entityId": "512616750",
    "entityType": "Track",
    "nonce": "0x74f97ca87224e1ee81ef7234ae166afeb508f6cc11fd74364ba056c156713588",
    "signature": "0x8d6565099b7a5c531ea8fb089f5c7f66e592600f45f486deaa32d5c2582ffba1720fd9d6aff1f9804c541f522a3c75d344816c017631099c263144cf929e233b1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}