Bitcoin Address Reuse Warning Puts Quantum Risk Back In Focus
Quantum computing is not breaking Bitcoin today, but it is creating a long-term custody planning issue. The main concern is that reused addresses and legacy wallets expose public keys on-chain, which could become vulnerable if future quantum computers can attack current signature schemes. That makes old coins, dormant wallets, and reused addresses potential targets for a future post-quantum migration. This is especially important for institutions, exchanges, and custodians holding large balances, since they need custody systems that can adapt over time. The key challenge is how to migrate safely, including coins controlled by inactive or unreachable owners. The takeaway is not panic, but preparation: Bitcoin’s security is still intact now, yet serious custodians need migration plans before quantum risk becomes urgent.
