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Bitcoin's quantum risk higher than thought; public keys exposed beyond blockchain records

Market News
28 Sep 2026
Tokenpost
View Source
Neutral
Bitcoin's quantum risk higher than thought; public keys exposed beyond blockchain records

Ledger CTO Charles Guillemet challenged the belief that only about 30% of Bitcoin is vulnerable to quantum computing attacks. He explained that public keys, which are critical for Bitcoin's security, can be exposed in many places beyond the blockchain, such as devices, backups, and partially signed transactions. This means the actual exposure risk is higher than the 30.2% on-chain figure suggests. Although a quantum computer capable of breaking Bitcoin's cryptography in minutes does not yet exist, Guillemet warned that Bitcoin will eventually need to adopt post-quantum cryptography to remain secure in the future.

Ledger CTO's comments on Bitcoin quantum risk provide context as of Sep 28, 2026 21:27 WIB. For readers following major cryptocurrencies, here is Pluang's market snapshot: of 50 priced major cryptocurrencies tradable on Pluang, 10 rose and 39 fell today. Notable movers include SXP (Solar) at Rp37 with a 1-day change of -46.27%, ALGO (Algorand) at Rp2.393 up 14.66%, and ONE (Harmony) at Rp45 up 13.08%.

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