TL;DR
Coinbase’s Quantum Advisory Council published a report on post-quantum migration and abandoned coins.
The report estimates that millions of Bitcoin may eventually be exposed through legacy address formats and address reuse.
The risk is future-oriented; the report does not say quantum computers can break Bitcoin today.
Coinbase Flags Long-Term Quantum Exposure
Coinbase’s Quantum Advisory Council has published a report examining how Bitcoin could approach a future post-quantum migration, including the problem of coins tied to exposed public keys, legacy P2PK addresses, and reused addresses.
The report estimates that roughly 7 million Bitcoin could face some form of future quantum exposure, including about 1.7 million BTC in legacy P2PK addresses and around 5 million BTC tied to address reuse.
The concern is not that Bitcoin is currently broken. The report is focused on long-term planning for a world in which sufficiently powerful quantum computers may one day thr
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