{
  "manageEntity": {
    "action": "Save",
    "entityId": "1501966363",
    "entityType": "Track",
    "nonce": "0x2fb8a9d6ee48ca754a5f50aaf30b6227e71e2ebb35e28521f837ab58e8cb604f",
    "signature": "0x052f4cb18282597a69cd7339a38039ac15e06e7ef7e62c29b3b29c6f4836d9383f4b631f41dd9603ffb8e4606b81412ada87c8fee836b639eea2980920327d951c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}