Chaum’s original constructions produce single-use credentials, based on a primitive known as a blind signature scheme. Blind signatures are a variant of digital signatures, with an additional protocol that allows for “blind signing” protocol. Here a User has a message they want to have signed, and the Server holds the signing half of a public/secret keypair. The two parties run an interactive protocol, at the end of which the user obtains a signature on their message. Most critically, the server learns nothing about the message that it signed.
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This will ask Ostrich for a string that does not match our regex, but does match type="email", meaning that the regex is in some sense more restrictive than the default browser validation of email addresses. These regexes would actually do something if attached to an input element with type email, since they would exclude any string that satisfies the constraints.