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Zero Knowledge Proofs allow proving that you are a part of a certain group without revealing who exactly. This can allow credible whistleblowing. For example, if some ML company issues a list of it's employees linked to ethereum wallets (or any other cryptographic key pair of choice), then any of it's employees would have an option to whistleblow on unsafe practices, while being 100% sure it's impossible to know who made this post.
This seem awesome to me and I wonder if anyone else shares my fascination and think this could be useful