{
  "manageEntity": {
    "action": "Save",
    "entityId": "628754",
    "entityType": "Track",
    "nonce": "0x01444da1314ae3acf01e55c05301f6b87a470bb631268bc68850efb82e47c238",
    "signature": "0x9fa8480ca336726dee2e1adbb77e92eef82ea014da65045d7657ff7ce22d8fd83a6e06fa491f8bfb6fe4342817d51064445926464ec249d93b759d568c4192c61b",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}