{
  "manageEntity": {
    "action": "Save",
    "entityId": "1490010563",
    "entityType": "Track",
    "nonce": "0xd69888cbba701b75d1aa6c13e5b4ca5320a85e46197e22f5fc6ec7baae81ff9c",
    "signature": "0x9755523ed5722c4f77ddd1934194d5e32391e87437f82ee847bf062d9251384421f7f11b29ec23a40f9ce6381c21a9742b40f0ab63de18abf24cb0850cf9d6781b",
    "signer": "0xDfAC0702040EaBd2d42e773014D4b014C0747D9c",
    "userId": "707937"
  }
}