使用 OpenID 验证回访用户的良好替代方法是什么？
I was looking into claimed identifiers, but they seem to have some issues with some providers, evidently? What about an attribute exchange request for an account's email address or something like that? Would that be a good alternative?
Advice much appreciated.
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通过“验证返回用户”，我假设您只是指检测用户何时返回您的帐户并登录？
属性交换数据由用户提供，并且是可选的且易于更改，因此不能依赖于与帐户安全远程相关的任何内容。
Google 的 OpenID 标识符对于每个域来说都是唯一的 - 解决方法就是使用单个域进行身份验证。这是假设您有多个域。如果您只有一个域，那么就不会有任何问题。
By "verify return users", I assume you just mean detect when a user returns to your account and log them in?
Attribute exchange data is provided by users, and is both optional and easily changed, so it can't be relied on for anything that is remotely related to account security.
Google's OpenID identifier is only unique per-domain — the workaround is just to have a single domain used for authentication. And that's assuming you have multiple domains. If you only have one domain, then there aren't any problems.