A new proof-of-concept funded by Project Eleven shows that Bitcoin wallets using hierarchical deterministic (HD) key derivation can resist quantum attacks—but the network’s most famous stash remains unprotected. The demonstration runs in just 243 milliseconds on a standard laptop, leveraging the wallet’s BIP32 derivation path as a second authentication factor. If a quantum adversary forges the original public-key signature, the legitimate owner can still reclaim the coins by proving knowledge of the master seed and the exact derivation path.
The tool does not help the oldest addresses, however. Early pay-to-public-key (P2PK) outputs—including the 1.1 million BTC attributed to Satoshi Nakamoto—were created without any HD structure. Those coins remain locked in a pre-BIP32 world, making the recovery mechanism useless for them. The development underscores the asymmetric quantum threat: any address whose public key is exposed on-chain is a target, and roughly 7 million BTC (about 35% of the supply) sit in such visible-key positions.
Separately, a breakthrough at Aalto University shows quantum hardware itself is advancing. Researchers built a microscopic heat engine that cools a qubit to near absolute zero, completing an entire quantum Otto cycle inside a superconducting circuit. While the engine is a physics milestone, its practical implication is that more efficient, scalable quantum computers inch closer to reality. Google’s Quantum AI unit already projected in 2026 that a device with about 500,000 physical qubits could crack Bitcoin’s elliptic curve—well beyond today’s machines (1,000–1,500 qubits) but within sight between 2029 and 2035 if error correction keeps improving.
Rolling out the recovery concept would require a soft fork or broad consensus—something Bitcoin’s governance rarely delivers fast. The proof is a step toward quantum resilience, but only for coins in modern HD wallets. Satoshi’s fortune remains the network’s silent exception, a permanent test case as the quantum clock ticks.
