{
  "manageEntity": {
    "action": "Save",
    "entityId": "2129435641",
    "entityType": "Track",
    "nonce": "0x2d160d8ec1de8a6d9076734f1b5d6d8e23a807e40077a0ca81a0a4fa13bed50d",
    "signature": "0x0d79837261642dca6338f8a6d1162cb4687f8d2342fcea8aa23d919da155c6ff3426c24b51ff5d17923c0c3948517248635fa92211290766abd802bca33accc41b",
    "signer": "0xA66d5981794A5e084FBD9adBFF28F465924fb9a9",
    "userId": "980224167"
  }
}