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Blockstream's research team compared Dilithium, Falcon and Hawk as post-quantum signature candidates for Bitcoin, selecting Falcon-1024 for its compact signatures, verification speed and mature security assumptions. The work evaluates a possible future change to Bitcoin's digital-signature system, not a deployed protocol upgrade.
Why it matters
Bitcoin could adopt a new signature family as quantum threats develop, preserving cryptographic flexibility without changing its core monetary design. Researchers also identified hybrid deployment as a potential future approach, while hash-based signatures remain the more conservative near-term option.
Market impact
Falcon-1024 still faces unfinished standardization, memory constraints on hardware wallets and no workable public-key derivation scheme. There is no immediate effect on Bitcoin's supply, demand or token economics. The signal is long-horizon: Bitcoin's cryptography is being evaluated as an adaptable component rather than a fixed assumption.
Frequently asked questions
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Why did Blockstream select Falcon-1024 over other post-quantum schemes?
Blockstream chose Falcon-1024 for its compact signatures, verification speed and mature security assumptions after comparing Dilithium, Falcon and Hawk.
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Is a quantum-resistant signature upgrade already live on Bitcoin?
No. Falcon-1024 is still a research candidate, with standardization, hardware-wallet memory and public-key derivation hurdles remaining.
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Which near-term signature option does Blockstream view as more conservative?
The researchers describe hash-based signatures as the more conservative near-term option while post-quantum lattice alternatives remain under evaluation.
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What is the proposed role of hybrid signature deployment on Bitcoin?
Researchers identified hybrid deployment as a potential future approach for combining signature schemes, not a protocol change already in place.
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What is the market impact of Blockstream's Bitcoin signature research?
There is no immediate change to Bitcoin's supply, demand or token mechanics. The signal is long-horizon and concerns the protocol's ability to adapt its cryptography.
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