{
  "manageEntity": {
    "action": "Save",
    "entityId": "1558906981",
    "entityType": "Track",
    "nonce": "0x5d86b11c392e6829f92d4f293262377f48eab2312dfcbbb69bdfbb239f8f1184",
    "signature": "0x99a5610f3ea122fc22455a38c1d4da0fd100d9eb1b242cfe16700efef568cc9752ad4ed9a844732b7be1f775845686e2a3d29a35148e3bef99449bd2b9ad95f11b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}