Why the Path to Quantum Resistance Runs Uphill for Wallet Manufacturers

Bitcoin custody has always involved some degree of risk, but wallet manufacturers like Trezor — which build physical devices designed to keep a user’s private keys secure offline — are preparing for a post-quantum world where new challenges arise. That’s because SHRINCS, the community’s leading candidate for a post-quantum signature scheme, allows users to make transactions using stateful signatures that require rigid state tracking to prevent funds from being stolen, according to Trezor CTO Tomáš Sušánka. SHRINCS was proposed late last year by Blockstream Research Director Jonas Nick and cryptographer Mikhail Kudinov.