It’s designed this way so that real buyers can prove that they’re human in real-time and so that bots don’t have an opportunity to pre-solve Captchas. Mints should not be customized to issue the Captcha token to buyers before the mint begins because the tokens will be invalid.
它是这样设计的，这样真正的买家可以实时证明他们是人，这样机器人就没有机会预先解决验证码问题。造币厂不应定制为在造币厂开始之前向买家发行验证码代币，因为代币将无效。