Bitcoin's Quantum Problem: Three Ways Researchers Are Trying to Fix It
Quantum computers remain a hypothetical but serious long-term threat to Bitcoin because Shor’s algorithm could derive private keys from exposed public keys and steal funds. No machine can do this today, but concern is rising as timelines appear to shrink. This week highlighted three response paths: 1) **Workarounds under current Bitcoin rules**: StarkWare said the cost of a quantum-safe mainnet transaction fell from about $320 to $67 after an open competition. These transactions are nonstandard and only protect coins whose public keys are still hidden. 2) **Protocol upgrades**: A durable fix would be a Bitcoin soft fork to adopt post-quantum signatures, but that will take years of design, testing, and consensus. 3) **Custody defenses**: Coinbase described post-quantum custody plans for its roughly $250 billion in assets, including a possible hardware fallback. Privacy work is converging with quantum-resistant design, including a new shielded-transfer proposal. Overall, Bitcoin is not quantum-safe yet, but preparation is shifting from theory to implementation.
