Willy Woo Says a Bitcoin Quantum Scare Could Create a Buying Opportunity

Onchain analyst Willy Woo argued that a future quantum-computing scare would not necessarily send Bitcoin (BTC) to zero, framing fear-driven selling as a potential buying opportunity while technical responses remain under discussion.

Woo’s recent post addressed a hypothetical point when quantum computers might threaten cryptography. He said the prospect of such a computer would not by itself mean Bitcoin’s value had to collapse. His comment was a market view, not a technical timeline.

The debate over Bitcoin’s quantum risk centers on whether the network could move to cryptography designed to withstand quantum attacks. Transactions on Bitcoin are authorized with ECDSA or Schnorr signatures. The theoretical concern is that a sufficiently capable quantum computer could derive a private key from a public key visible on-chain.

Coinbase’s Oct. 13 discussion called for preparation well before a quantum computer capable of threatening cryptography is announced, because changing network rules and coordinating the broader ecosystem can take years. One possible design would let the same funds be spent with either a conventional ECDSA or Schnorr key or a post-quantum key. Coinbase described the post as discussion input, not a final company position.

Two draft Bitcoin Improvement Proposals outline different parts of a possible response. BIP-360 proposes Pay-to-Merkle-Root outputs, which would remove Taproot’s key-path spending option and reduce exposure from public keys that remain visible for long periods. The proposal does not add post-quantum signatures or address attacks on transactions waiting in the mempool.

BIP-361 sketches a phased move away from legacy ECDSA and Schnorr signatures, conditional on a post-quantum output format becoming available. Its draft sets Phase A for 160,000 blocks later, estimated at about three years, and Phase B two years after that. Those are proposed timings in a draft, not an adopted Bitcoin schedule.

The timing, if any, of a quantum computer capable of breaking the relevant cryptography remains uncertain. Public-key exposure at rest does not mean funds can be stolen with current technology. Neither proposal is an active Bitcoin rule, and no network-wide migration schedule has been adopted.