01
No quantum computer today can break Bitcoin - but Coinbase says the fix needs to start years before one can.
02
On October 13, 2026, Coinbase published a proposal pushing Bitcoin to begin a multi-year migration to quantum-resistant signatures.
03
Glassnode estimates 6.26 million BTC, about 31.2 percent of all bitcoin, sit in addresses with exposed public keys.
04
Project Eleven's higher estimate puts the exposed figure near 7.1 million BTC, including old Satoshi-era coins.
05
The risk is to digital signatures, not mining - proof-of-work stays safe from quantum attacks for decades.
06
Coinbase backs BIP-360 and P2TRv2 as building blocks, plus hybrid wallets that work with both old and new keys.
07
Nothing has been adopted. This is a proposal for discussion, not an approved Bitcoin upgrade.
08
For now: don't reuse Bitcoin addresses, and don't panic - but don't expect this debate to go away either.