{
  "manageEntity": {
    "action": "Save",
    "entityId": "647510224",
    "entityType": "Track",
    "nonce": "0x8eda9b77f767605d0535413997a5c389798705914ef0e2976d59f833876b8589",
    "signature": "0x71d5c97fc94aae6886e2ff49d1b08177a3084bbf2d3414cbf1eea55d2e2517f36637b168147cad77218128fc9f466c45a5534a9d87b0aa63b3abae52c86d0fa41b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}