{
  "manageEntity": {
    "action": "Save",
    "entityId": "670550",
    "entityType": "Track",
    "nonce": "0x6f86bc1374629eab54e41ca64f5719510dfeed5b17aa1f31d09eb489edb1aef8",
    "signature": "0x10d42f077889003304c0617de7917d54142b6e08b214aa45661749cfc51e675152691f03f6d06da6c968f28273d4c3e9c57a237a128406ed86b3baf26caaf6951c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}