{
  "manageEntity": {
    "action": "Save",
    "entityId": "439689",
    "entityType": "Track",
    "nonce": "0x559fa806455be342537f8170eb1ff5c8f077e967562b62b6273a4fa097e04c8d",
    "signature": "0x4d8aa0a56c3481b64b7fc6591ab1d9ea98f21694f2cab8815f55ca5f3fe00c0a26e38dadc84bd2f1485bba836f5f1c26f47b09c2512dbe901674926c0e526a111b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}