{
  "manageEntity": {
    "action": "Save",
    "entityId": "325602458",
    "entityType": "Track",
    "nonce": "0x800d90e347cba92c52c6ea1f2982181d6cc56dd31eae60e257ca86a31c58640d",
    "signature": "0xa18ae7ae3bb4d2d8f37d06bcd1f27b23a732fabcf77b32384a2aa5355faa24a05074b8ec1b7987151e5921fadecc2120b686469ed9fb913d8985914fd3bfbbd01c",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}