{
  "manageEntity": {
    "action": "Save",
    "entityId": "888747466",
    "entityType": "Track",
    "nonce": "0x771347f58a36f2d76c87eff701995b45607fa365c021bff20d2da3fb08da781b",
    "signature": "0xb8cbf7708995a5973d838bf5907bbfaf38685cbae8dbc3e1f31058841804eede1e0d08175a8383fb2412b373c36bbabcb647c6ef90596e7faa31d70c593c43751b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}