Blind Signatures Explained: Getting Something Signed Without Revealing It (opens in new tab)

Imagine handing a notary a sealed envelope with carbon paper inside, having them stamp the outside, and walking away with their signature pressed onto a document they never read. That is a blind signature — and it is the cryptographic foundation for anonymous tokens, untraceable digital cash, and credentials that prove you are authorized without revealing who you are. A blind signature, introduced by cryptographer David Chaum in 1982, is a form of digital signature where the signer does not s...