Blind Signatures with Georg Fuchsbauer | a16z crypto Research Series
Source: YouTube · a16z crypto · published Nov 17, 2025 · 1:08:39
The video provides a comprehensive tutorial on blind signatures, explaining their cryptographic foundations and applications in blockchain protocols, particularly focusing on privacy-preserving transactions 0:24.
Key Takeaways:
• Blind signatures allow a signer to sign a message without seeing its content, providing both message hiding and unlinkability 0:56
• The RSA-based blind signature scheme uses homomorphic properties to blind messages before signing and then unblind the signature 5:49
• Schnorr signatures can also be adapted for blind signing with perfect blindness using blinding factors alpha and beta 35:26
• Blind signatures enable privacy in blockchain applications like TumbleBit, which prevents linkability in payment channels 15:57
• Applications include e-cash systems, anonymous credentials, private voting, and Bitcoin blind coin swaps 1:55
The tutorial demonstrates both theoretical foundations and practical implementations of blind signatures in modern cryptographic systems.
Sources:
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First 800 characters of the transcript
All right, morning every welcome everyone to today's A16Z crypto research seminar. Uh very happy to introduce George Fushbower from TU Wine uh who's done lots of kind of very deep work in cryptography and today we have the benefit of getting a tutorial from him specifically on blind signatures. So take it away. >> Thanks Tim. So I'll talk about blind signatures and some applications and since this is A16Z I'll focus mainly on applications to blockchain protocols. Okay. So let's start with some basics. What's uh a signature scheme? So we have a signer or a singer called Sai uh who has a verification key and a signing key. and he can use this signing key to produce signatures on any message which can then be verified using uh his verification key. What's a blind signature scheme? So here now…