{
  "manageEntity": {
    "action": "Save",
    "entityId": "1978911843",
    "entityType": "Track",
    "nonce": "0x5774b59e5e860003316aeca300c52656bb24e30d4cec6cc1f9d3f96d3f39420a",
    "signature": "0x8f9fac11998ff78ec7a6eacc98fb7e81fd261a39f3ab36db25d05bb66568577e3d7a9d110e98e88231a5dc348d96bda960232cac9fa572b90fc2ed37a77a00211b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}