Crypto16 April, 20261 min read
Adam Back Urges Bitcoin Quantum Resistance Over Coin Freeze Proposal
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Adam Back advocates optional quantum-resistant upgrades now rather than a forced coin freeze. BIP-361 would phase out current signatures, freezing non-migrated coins for five years.
Quantum Threat Debate
The Bitcoin community is deeply divided over how to address the quantum computing threat. Blockstream CEO Adam Back urged Bitcoiners to build quantum-resistant solutions now, even though the threat remains decades away. He advocated for optional upgrades, arguing that preparation is key.
Back's position contrasts sharply with a proposal to freeze quantum-vulnerable coins on a fixed five-year timeline. The proposal drew sharp criticism from several community members.
Divergent Approaches
The core disagreement is whether the network can respond quickly or needs pre-scheduled strict measures. Back believes developers can coordinate quickly if the threat accelerates.
Lopp's proposal assumes they cannot. Google and Caltech researchers said functional quantum computers could arrive sooner than previously estimated.
Technical and Market Implications
Bitcoin relies on elliptic-curve cryptography vulnerable to quantum attacks. Over 34% of all Bitcoin has exposed a public key on-chain. BIP-361 would phase out quantum-vulnerable addresses over five years and freeze coins that do not migrate.
No prior Bitcoin upgrade has rendered existing transactions invalid. Critics warn that protocol-enforced freezes amount to confiscation.
Back's Rebuttal and Market Response
Back has refuted claims that quantum computers could decipher private keys imminently. Bitcoin does not use encryption but signatures. Addresses do not reveal public keys until they are spent.
The debate has resurfaced, creating friction between developers and investors. The disconnect could weigh on market sentiment.
