Nine crypto companies formed a Quantum Alliance on 16 October 2026 to prepare bitcoin for future quantum attacks, days after Google said its Willow chip cut quantum error rates by about 40 times. Anyone holding bitcoin in an old-style wallet should understand why millions of coins may already be exposed.
What actually happened
Google said its Willow chip can prepare quantum states needed for advanced calculations with about 40 times fewer errors, according to CoinDesk. That cuts one of the hardware bottlenecks blocking any future attempt to crack bitcoin wallets. Separately, nine crypto companies launched the Quantum Alliance to coordinate a response, though they disagree on timing and on whether vulnerable BTC should be frozen. The warnings point to roughly 6.4 million bitcoin seen as exposed to a future quantum attack. Bitcoin traded at $81,527 as of 10:30 UTC on 17 October 2026, down -0.53% over 24 hours, after swinging between $80,761 and $82,816. Trading volume reached $24.58 billion.
How we got here
Quantum computing has threatened bitcoin's signature scheme for years, but progress stayed theoretical until error rates fell enough to make real attacks plausible. Satoshi-era wallets, many untouched for over a decade, use older address formats that could be first in line for a future attack. A day earlier, bitcoin had briefly dropped under $80,761 before bouncing back above $82,816, while investors kept pulling money from ether, SOL and ZEC funds, per CoinDesk. Hardware security also made headlines: Chainalysis found a job-scam fraudster lost almost $5 million in bitcoin through a compromised Ledger exploit.
Why this matters for you
For holders, the news is a reminder to check wallet type. Coins sitting in old-format addresses carry more exposure than coins in modern wallets. For builders, the Quantum Alliance signals an industry trying to agree on standards before a crisis forces one, though the freeze question remains unresolved and could split the community if it ever reaches a vote. For readers watching price, today's -0.53% move sits inside a normal daily range, showing little direct link between the quantum headlines and bitcoin's trading. The bigger market story stayed the ETF outflows from altcoin funds, not bitcoin's own supply risk.
The bigger question
If a workable quantum attack ever becomes real, should the community freeze old, vulnerable bitcoin to protect it, or let the original rules of the network stand no matter the cost? The Quantum Alliance has not agreed, and the answer could reshape what immutable actually means for bitcoin's next era.
What to watch
Watch for any concrete proposal from the Quantum Alliance on freezing or migrating old-format coins. TD Cowen raised its price target on Strive by 27%, pointing to easing warrant pressure as the firm plans fresh funding for more bitcoin purchases, a flow worth tracking against the ETF outflows seen elsewhere.
This article is information, not financial advice. Prices are a snapshot and change constantly. Nothing here is a recommendation to buy or sell any asset. Do your own research.
