Revocable credentials. Another approach is to build credentials that can be revoked in the event of bad behavior. This requires a procedure such that when a particular anonymous user does something bad (posts spam, runs a DOS attack against a website) you can revoke that specific user’s credential — blocking future usage of it, without otherwise learning who they are.
This is a wonderfully designed puzzle game that oozes atmosphere. The game tasks players with exploring a gigantic mansion, but there's a twist. You actually build this mansion as you explore, room by room. This is done by placing what can only be described as magical blueprints.
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