{
  "manageEntity": {
    "action": "Save",
    "entityId": "654119641",
    "entityType": "Track",
    "nonce": "0x51a39e2011909e55e9fdc89d53c3c5a602ec07460422538ec199590d89611134",
    "signature": "0xe0589e0a586cd4a60399cb45e93d0ae4ef7a905e1fb911ae3c4886edde155b6d499fb209d8967428e9e28ae427660277bc95d55e19433e925ea8d9e55f2a23051c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}