{
  "manageEntity": {
    "action": "Save",
    "entityId": "854767",
    "entityType": "Track",
    "nonce": "0x77cd71b272f78fa6cab4fa7d8c2d707be5b258a24d71a064e0acff9d0de6d3db",
    "signature": "0xe47f97275cdbd2a54b6ca4d081599b054f2e89fb3aa560c9b703dc178e53f08a1cf4bd76391bde21462e4fa9f4bcaf2dc59e6a0cdd9250b87bb67058758c9fe91c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}