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.
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