SLP400 Jonas Nick & Tim Ruffing - Half Signature Aggregation: What is it and how does it help scale Bitcoin?

<p>Jonas Nick &amp; Tim Ruffing, bitcoin researchers and contributors at Blockstream rejoin me on the show, this time to chat about half signature aggregation. This is a scaling technique that can help scale Bitcoin and enable more transactions inside a block or help with L2 protocols. We discuss:</p> <ul> <li>How this idea came to be</li> <li>What is half aggregation vs ‘full aggregation’?</li> <li>What kind of savings are possible?</li> <li>What are the downsides?</li> <li>How would this work in practice?</li> <li>Is a soft fork required?</li> <li>Next steps for discussion, research, contributors</li> </ul> <p><strong>Links:</strong></p> <ul> <li>Twitter: <a href="https://twitter.com/n1ckler" rel="noreferrer nofollow noopener" target="_blank">@n1ckler</a></li> <li>Twitter: <a href="https://twitter.com/real_or_random" rel="noreferrer nofollow noopener" target="_blank">@real_or_random</a></li> <li>Blog post: <a href="https://blog.blockstream.com/half-aggregation-of-bip-340-signatures/" rel="noreferrer nofollow noopener" target="_blank">Half-Aggregation of BIP 340 Signatures</a></li> <li>CISA github: <a href="https://github.com/ElementsProject/cross-input-aggregation" rel="noreferrer nofollow noopener" target="_blank">Cross-Input Signature Aggregation</a><a href="https://github.com/ElementsProject/cross-input-aggregation" rel="noreferrer nofollow noopener" target="_blank"> </a><a href="https://github.com/ElementsProject/cross-input-aggregation" rel="noreferrer nofollow noopener" target="_blank">(CISA)</a></li> <li>Half aggregation: <a href="https://github.com/ElementsProject/cross-input-aggregation/blob/master/half-aggregation.mediawiki" rel="noreferrer nofollow noopener" target="_blank">Half-Aggregation of BIP 340 signatures</a></li> </ul> <p><strong>Previous Episodes</strong></p> <ul> <li><a href="https://stephanlivera.com/episode/222/" rel="noreferrer nofollow noopener" target="_blank">SLP222 Jonas Nick and Tim Ruffing What’s MuSig2? What Does it Mean for Bitcoin Multisig?</a></li> <li