According to Trezor CTO Tomáš Sušánka, the hardware wallet maker is preparing for post-quantum Bitcoin security challenges by redesigning its user interface for SHRINCS signatures. SHRINCS, the community's leading candidate post-quantum signature scheme, offers two options: smaller, more efficient stateful signatures that carry theft risks if reused beyond a signing budget, and larger, safer stateless signatures. Trezor is considering making stateless signatures the default and placing the riskier stateful option behind advanced settings to reduce user error risk.

Sušánka noted that stateful signatures are 10 times smaller than stateless alternatives, presenting a significant efficiency trade-off. Beyond wallet software, hardware devices themselves require post-quantum upgrades for firmware and authentication, as most currently rely on quantum-vulnerable cryptography for these functions. Trezor is already shipping products like Trezor Safe 7 that support post-quantum cryptography for wallet authentication.

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