{
  "manageEntity": {
    "action": "Save",
    "entityId": "502361558",
    "entityType": "Track",
    "nonce": "0x2a87dbe60d5e960ff96a11928e47bc5db4a6f687265b7b97f40979989609ffd1",
    "signature": "0x2dfd208d8ee684e37a286efb35cf7841bd86f8ff1ec3b99c63cd3a82551b040844c8d8ade1bb5ece0219b700443cb61bf9af4286939a3239a7c2bc03e5fc12bc1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}