Does ProtonMail save your phone number?

ProtonMail 不保存 CAPTCHA 结果。如果您收到电子邮件或短信验证，ProtonMail 只会保存您的电子邮件或电话号码的cryptographic hash，该 hash不会与您创建的帐户永久关联。

cryptographic hash：维基百科解释;百度百科解释

Protonmail FAQ Can the police track ProtonMail? Do I need a phone number to register a ProtonMail mailbox? What does a ProtonMail address look like? Is ProtonMail legal in the US? Is ProtonMail more secure than Gmail? Does Protonmail work in China? What username should I use for ProtonMail?