{
  "manageEntity": {
    "action": "Save",
    "entityId": "629945776",
    "entityType": "Track",
    "nonce": "0x578f1dabd66a34c5d082132f460ee321bfee5c474006f31b7cdf7457ab248355",
    "signature": "0x6ccd3438eebf41d0ff0e9a12dbfff01345b01849248cdd72796a08518d5939597fc7b11828676145415e972ace7ad83b40a6d4a0948cc8934b5686da0c773c421b",
    "signer": "0x866c9135AB994f6F3351c1ED8F1c3f8bA8eDDafE",
    "userId": "954104006"
  }
}