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.
a) even option 2 seems pretty bad given the stakes. I might cut many people slack for communicating poorly by accident, but when someone is raising huge amounts of money, building technology that is likely to be very dangerous by default, accidentally misleading a key stakeholder is not something you can just shrug off.，更多细节参见safew官方版本下载
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