Bitcoin Quantum Risk: 7M BTC Exposed, BIP-360 Still Just a Proposal [2026]

A little over one-third of all bitcoin in circulation now sits in addresses that a sufficiently powerful quantum computer could theoretically drain, according to wallet-scanning research that has moved from academic sidebar to boardroom agenda item in 2026. Project Eleven, a startup dedicated to tracking Bitcoin’s quantum exposure, put a number on the problem: roughly 6.99 million BTC live in addresses with exposed public keys, out of about 14 million addresses it scanned with non-zero balances. Coinbase’s internal quantum advisory work reached a similar figure, near 7 million BTC, and flagged that much of that exposure sits in active wallets and exchange cold storage, not just coins abandoned since the Satoshi era.

That’s the backdrop for a debate that has split the Bitcoin developer community this year: whether to force through a consensus change, BIP-360, that would give the network a quantum-resistant address format before a “Q-Day” ever arrives. The fight isn’t really about cryptography anymore. It’s about timing, coordination costs, and who moves first when 7 million BTC, worth hundreds of billions of dollars at current prices, is the collateral at stake.

The Numbers Behind Bitcoin’s Quantum Exposure Problem