# Trezor Weighs Stateless Signatures for a Potential Bitcoin Upgrade By Simon Yoon Canonical URL: https://www.tokenpost.com/news/technology/57136 Published: 2026-11-14T02:35:42.000Z Updated: 2026-11-14T02:35:42.000Z Section: Technology > If Bitcoin adopts SHRINCS, Trezor is considering making stateless signatures the default and placing the smaller stateful option in advanced settings. Trezor is weighing a stateless-signature default for its Bitcoin (BTC) wallets if the network adopts SHRINCS, a proposal that could reduce risks from mishandled one-time keys. In that scenario, Trezor is considering making stateless signatures the standard choice and placing the stateful option in advanced settings. The plan responds to the risk of asking users to manage signature state themselves, a task Trezor CTO Tomáš Sušánka said should remain the wallet maker’s responsibility. SHRINCS is a proposed hash-based signature design from Blockstream Research Director Jonas Nick and cryptographer Mikhail Kudinov. It offers stateless signatures, which can be reused, and stateful signatures, which rely on one-time keys arranged in a tree. Accidental reuse of a one-time key can reveal information that lets an attacker create a valid signature and spend the wallet’s funds. Wallet software would need to track those keys carefully and handle potential edge cases. Stateless signatures avoid that reuse hazard, but their larger size can slow signing and affect transaction fees and other efficiency measures. Sušánka said stateful signatures are “10 times smaller,” a size difference he considers significant. He described SHRINCS as a conservative option because it relies on assumptions also used by SHA-256. “It shouldn’t be the user’s job,” Sušánka said of tracking state. He also questioned how the state could be kept aligned across two Trezor devices using the same recovery seed. If the devices do not share an accurate record of used keys, a stateful system can expose the wallet to the risks of accidental key reuse. Most signing devices rely on quantum-vulnerable cryptography for functions such as firmware and device authentication. Trezor is shipping the Trezor Safe 7 with post-quantum cryptography for wallet authentication. That protects authentication on the device, but it does not make Bitcoin transactions quantum-secure. Transactions would gain post-quantum protection only after Bitcoin upgrades its own signature system. Bitcoin has no agreed quantum-resistant upgrade, and [its quantum-resistance proposals remain in draft stage](). Sušánka urged developers to offer migration options early because moving potentially millions of users will take time. He said the transition may require compromises to make progress. ## Links in this article - [its quantum-resistance proposals remain in draft stage](https://www.tokenpost.com/news/technology/39613)