{
  "manageEntity": {
    "action": "Save",
    "entityId": "1548742819",
    "entityType": "Track",
    "nonce": "0xdc9ff2d9c47f20d964bfb5d321307063c8edd0ef67e3e5f3d8466046841a19c8",
    "signature": "0xfb18da04965267178988c6fc5aa442fed7bba838ed6023bb00c3c7654bad8155727a1fb617c37c2610be93d0a4e68b5dba9c792780a9cb8680488eed76ad71021c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}