Project Eleven Warns Bitcoin’s Quantum Migration May Already Be Too Late

Bitcoin uses elliptic-curve cryptography to protect assets and communications, but sufficiently powerful quantum computers could eventually break its current encryption. Experts say the more immediate danger is a “harvest now, decrypt later” strategy, in which attackers intercept and store large volumes of encrypted communications today, then recover sensitive historical data once the technology matures. The threat extends beyond wallet private keys.

Security experts and an early-stage venture investor have recently warned that historical communications and infrastructure data across the Bitcoin ecosystem may already be targets for quantum attacks. Ethereum has begun work on a post-quantum migration, but as of this report, neither Bitcoin nor related companies had publicly committed to specific safeguards, disclosed investment amounts or set completion dates. The upgrade timetable and division of responsibility therefore remain unclear.

Bitcoin currently protects assets with ECDSA and Schnorr signatures. If a large-scale quantum computer could run Shor’s algorithm, it might be able to derive private keys from public keys that have already been exposed. Project Eleven estimates that about $2.3 trillion in assets is at risk, making a post-quantum migration critical to the security of the entire wallet, exchange and custody ecosystem.

Project Eleven CEO Alex Pruden told CoinDesk’s Consensus Miami on May 6, 2026, that Bitcoin developers should immediately move post-quantum signatures from research into production. The Taproot upgrade took about five years and migration was voluntary. A new approach would require participation from all holders, wallets, exchanges and institutions, while BIP-360 has already laid the groundwork for a quantum-resistant output type.

Bitcoin currently relies on ECDSA and Schnorr signatures to secure asset ownership. A sufficiently powerful quantum computer could eventually use Shor’s algorithm to derive private keys from exposed public keys. Although the threat remains confined to laboratory experiments, migrating the network’s wallets, software and users would take considerable time, making early development of quantum-resistant safeguards critical to asset security.

Speaking at Paris Blockchain Week on April 16, 2026, Blockstream CEO Adam Back advocated introducing an optional upgrade first and giving users 10 years to move funds to quantum-resistant addresses. He estimated that a real threat remains at least 20 years away. Blockstream’s research division proposed a hash-based signature scheme in December 2025. The migration could also clarify whether the roughly 500,000 to 1 million Bitcoin attributed to Satoshi Nakamoto can still be moved.