Jameson Lopp argues freezing 5.6 million BTC is preferable to letting quantum attackers seize them

Jameson Lopp has reignited Bitcoin’s debate over how to respond if quantum attackers ever gain the ability to break the network’s cryptography. He argued that freezing millions of dormant coins would be preferable to allowing those coins to be seized by an attacker. Lopp said he would rather see an estimated 5.6 million BTC, which he believes are lost or dormant, removed from an attacker’s reach than flow to an entity with little concern for the ecosystem. At current prices, he estimated the value of that stash at roughly $420 billion.

The comments followed the release of BIP-361, a proposal Lopp co-authored that examines how Bitcoin could phase out quantum-vulnerable signatures and, over time, invalidate transactions from wallets that fail to migrate. Lopp said the draft is not being presented as a rule change, but as a contingency plan for a threat that could become existential if ignored. He also described the proposal as a rough idea rather than a finished specification, adding that he does not believe it is necessary right now. His emphasis, he said, is on thinking adversarially before the threat becomes urgent.

What Lopp said about BIP-361

• “I know folks don't like it. I don't like it myself. I wrote it because I like the alternative even less.”
• “It isn't a spec, nor is it proposed for activation. It's a rough idea for a contingency plan that needs more R&D.”
• “I hope it never needs to be…”

The fault line: technical risk versus Bitcoin’s ownership philosophy

Supporters and critics are reacting to the scale of what BIP-361 would imply. Lopp pointed to the fact that roughly 28% of all bitcoin has not moved in more than a decade. He argued that a quantum-enabled recovery of those coins could destabilize both price and trust. In his view, the greater danger would not be a large sell-off by itself, but market panic triggered by signs that vulnerable coins can be credibly recovered using quantum computing. If that confidence breaks, he said rational holders would likely wait until they believe the chain is secured against such attacks.

However, the proposal also collides with one of Bitcoin’s core convictions: ownership should not become conditional. The backlash, according to the discussion, centers on the concern that freezing dormant coins to defend the network could weaken Bitcoin’s promise of unstoppable money. Lopp acknowledged he does not like the proposal and hopes it never needs to be adopted, but argued that economic incentives could outweigh philosophical concerns in an existential scenario.

Why the debate has intensified

The discussion is framed as more than a theoretical exercise because it forces Bitcoin to confront how far it might go to preserve trust before quantum risk becomes real. In that framing, BIP-361 becomes a test of priorities: defending the network under extreme conditions versus maintaining the principle that ownership should not depend on intervention.