Bitcoin's DahLIAS: New Scheme Enables Full Signature Aggregation
A groundbreaking cryptographic scheme, DahLIAS, has been introduced by researchers from Blockstream and Ledger. This new protocol aims to revolutionize Bitcoin transactions by enabling full aggregation of signatures, a concept long discussed but never fully realized on Bitcoin's security model.
DahLIAS, introduced in a paper by Jonas Nick, Tim Ruffing, and Yannick Seurin, provides the first formal, secure construction of a full constant-size aggregate signature scheme for Bitcoin's native curve, secp256k1. This means multiple signatures across different inputs can be combined into one constant-size, 64-byte signature.
The scheme offers strong cryptographic guarantees, backed by formal security proofs. It reduces the size of complex transactions and speeds up verification, as it's faster than checking each signature individually. DahLIAS allows each signer to authorize different inputs, with all signatures combining into one, but it's not a multisignature protocol like MuSig2 or FROST.
To integrate DahLIAS into Bitcoin, a Bitcoin Improvement Proposal (BIP) would need to be written, detailing the scheme and considering its implications for consensus and implementation. The authors note that DahLIAS adds no significant new assumptions beyond those already relied on by Bitcoin.
The DahLIAS paper, published by Blockstream and Ledger researchers, marks a significant milestone in Bitcoin's cryptographic history. It paves the way for more efficient and complex transactions, potentially improving Bitcoin's scalability and functionality. However, its implementation will require careful consideration and community consensus.
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