Cryptographer Jonas Nick, researcher at Blockstream, presented SHRINCS, a post-quantum signature scheme designed specifically for Bitcoin, published as a draft Bitcoin Improvement Proposal (BIP). The system relies on SHA-256 cryptographic hash functions already used by Bitcoin and combines two signature types to balance security and efficiency while limiting the impact on blockchain space. The document defines key generation, signing, and verification mechanisms with a reference implementation. The project remains at a preliminary stage and several important steps still need to be completed, including the development of a security proof and the creation of a separate BIP for its integration into Bitcoin Script. This proposal represents a concrete advancement in preparing the Bitcoin network for a potential quantum threat.
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