{
  "manageEntity": {
    "action": "Save",
    "entityId": "575947",
    "entityType": "Track",
    "nonce": "0x791a6f2a864315041798a189593fbe662f20c15df45ea73148ab574ea8b9ea7c",
    "signature": "0xd4fe74f6508ca03af1a1c2f2c900c6e3cef152b8b4470f07bada477897a8bb322333f4d802721ae649b5f47cdf534b9663bbba93450fe42e461cb97bd2edf0e71c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}