bitcoin optechTaprootTechnical

Bitcoin Optech #141: Signature Delegation And Taproot Activism

This week’s Bitcoin Optech newsletter covers signature delegation, Taproot’s effect on Bitcoin’s resistance to quantum cryptography and moreThe Bitcoin Optech newsletter provides readers with a top-level summary of the most important technical news happening in Bitcoin, along with resources that help them learn more. To help our readers stay up-to-date with Bitcoin, we’re republishing the latest issue of this newsletter below. Remember to subscribe to receive this content straight to your inbox.This week’s newsletter describes a technique for signature delegation under Bitcoin’s existing consensus rules, summarizes a discussion about taproot’s effect on Bitcoin’s resistance to quantum cryptography, and announces a series of weekly meetings to help activate taproot. Also included are our regular sections describing notable changes to services and client software, new releases and release candidates, and notable changes to popular Bitcoin infrastructure software.NewsSigning delegation under existing consensus rules: Imagine Alice wants to give Bob the ability to spend one of her UTXOs without immediately creating an onchain transaction or giving him her private key. This is called delegation and it’s been discussed for years, perhaps most notably in recent times as part of the graftroot proposal. Last week, Jeremy Rubin posted to the Bitcoin-Dev mailing list a description of a technique to accomplish delegation using Bitcoin today.Let’s say Alice has UTXO_A and Bob has UTXO_B. Alice creates a partially signed transaction spending both UTXO_A and UTXO_B. Alice signs for her UTXO using …
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