Charles Guillemet (샤를 기예메), chief technology officer at cryptocurrency hardware wallet maker Ledger, said Bitcoin users do not need to rush to adopt multisig wallets in response to the recent Coldcard incident. On Aug. 4, blockchain outlet U.Today reported that he warned that making wallet structures more complex to boost security can instead create additional risks.

In a post on X, Guillemet stressed that multisig makes wallet recovery and management more difficult. He said many users end up creating cumbersome setups that are hard to recover safely in practice.

He suggested Bitcoin miniscript as an alternative. Miniscript lets users set detailed spending conditions such as inheritance rules, time-locked recovery keys and a 2-of-3 policy requiring approval from 2 of 3 keys. He explained that Ledger's implementation supports "clear signing" on all spending paths, allowing users to verify exactly what they are approving on a hardware wallet.

Guillemet said miniscript also helps developers more easily build customised wallet software. He said he recently used Anthropic's Claude to build a Bitcoin wallet supporting advanced spending policies within hours, and added that Ledger's clear-signing approach made him feel comfortable testing the wallet on the Bitcoin mainnet.

He also mentioned MuSig2 as a cryptographic alternative to existing script-based multisig. He said that, as far as he knows, the only device that currently supports MuSig2 is a Ledger hardware wallet.

Guillemet said he was not dismissing multisig itself. It can still be an appropriate choice for some users, but he stressed that security decisions should be based on individual threat models rather than reactions to recent incidents. For most users, he added, a properly backed-up single-signature hardware wallet remains the most practical option.