{
  "manageEntity": {
    "action": "Save",
    "entityId": "698387548",
    "entityType": "Track",
    "nonce": "0x10733bf27791ff21f0019931152a3e4e03abadbbac107a37ed05284a013cd6a9",
    "signature": "0x637ca4cf04bd079d959744cf1e2b2a29375389b388479f9c638b0c0e3030da3b457c42a85994594fabe17f6633cf3bca739b71cfed061fffff3316bce3850b1f1c",
    "signer": "0xC35123bF05ca0B3A7B333c53E47bcd9f9DA864d4",
    "userId": "33896318"
  }
}