{
  "manageEntity": {
    "action": "Save",
    "entityId": "1937483553",
    "entityType": "Track",
    "nonce": "0x6dcad0c58f82c5e015b526aab4e84aa898115e67f62b234c0ab874dba500e659",
    "signature": "0xe7fcdb5373e08856e3fe0ea9c7d41c4f3ef7b252173d6fb62d53e2946d9969573ddce16653edfa988189df96231b50741be56b091695032e9ee97d19f4a109aa1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}