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Jonas Nick of Blockstream has developed post-quantum signing algorithms like "shrinks and shrimps" that are hash-based, offering security against quantum attacks but resulting in significantly larger transaction signatures and potentially reduced transactions per second.
Jonas Nick details Shrimps, a post-quantum hash-based signature scheme where signatures are 350 bytes on a primary stateful device. If that device is lost, imported devices produce 2.5 kilobyte signatures, with a final 8 kilobyte fallback for catastrophic failure.
Shrimps and its predecessor Shrinks require wallets to be stateful, tracking an incrementing integer for each public key to count signatures. If this state is lost or corrupted, security breaks and the wallet must use a large fallback signature.
Black says Jonas Nick's Shrimps advance makes Shrinks Plus more compatible with Bitcoin's wallet recovery model.
Blockstream's Shrimps scheme creates stateless 2500-byte signatures for recovery scenarios, trading larger size for no required off-chain data.
Blockstream researcher Jonas Nick presented Shrimps, a post-quantum signature scheme for Bitcoin that supports multi-device signing.
Shrimps signatures are around 2.5 kilobytes, compared to SLH-DSA's 7.8 kilobytes, offering a compactness advantage.