{
  "manageEntity": {
    "action": "Save",
    "entityId": "687791660",
    "entityType": "Track",
    "nonce": "0x861aacfbf919056e8851f98220f953b3211918bed835bca81e7d146446f86789",
    "signature": "0xc05b794a1e0a07e0aef17b20d134b3657299c4929662f770c4f5147fe2e6a4220ac05abc8e641e7c34b7158a83521eecbc16db320658adbe633c3b616e7db8521b",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}