{
  "manageEntity": {
    "action": "Save",
    "entityId": "2978251",
    "entityType": "Track",
    "nonce": "0xa45ed6e40293013a514356a72146cb4d58546a6d7150b2e85f96ba445591ee3e",
    "signature": "0xb8f9ac1492d1a826ff21665ce7ac7ad5fd66b32374b7912c5f3c3228a9eb41fc399efc9b33115e3afa2d05100f40a80e7a5308dbbce354e74d7190043e61c8a31c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}