{
  "manageEntity": {
    "action": "Save",
    "entityId": "747127",
    "entityType": "Track",
    "nonce": "0x2f73e6b7dea71e5195062308ed09bb725cd3cb9882f86d2e44a859f4d5c77e66",
    "signature": "0xacefc8d183ca1e3687b0f96020add024bea34c3e3c5df05738bd73f08d6db9ea4f7ea859de055057bee36a8eaf739a2beb1a23217b300ded9f477edeb5f904751c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}