6.4 million BTC may face future quantum risk.
A new industry group has been formed to prepare cryptosystems for a threat that does not currently exist on a practical scale:. Quantum attacks. Nine companies created the:. Quantum Alliance.
Coordinate research and preparation for future computers capable of attacking public key cryptography today. The bitcoin number that gets attention is:. This is the estimated amount of bitcoins behind addresses where the public key is already visible on the chain. Why does it matter? Bitcoin ownership relies on cryptographic signatures. A sufficiently powerful future quantum computer could theoretically derive a private key from an exposed public key. This can put some older or previously used Bitcoin addresses at greater risk. important:. Bitcoin is not currently broken by quantum computers. There is currently no known machine capable of stealing these coins in this way. And Bitcoin mining itself is another cryptographic problem. The concern is mainly about: Wallet ownership keys.
Not someone instantly rewrites the Bitcoin blockchain. The most difficult debate may end up being social rather than technical. If old coins become vulnerable:. Should bitcoin freeze them? move them? Or leave the ownership unchanged? The threat is still theoretical. The preparation becomes real.