Selected Q&A from Bitcoin Stack Exchange:

- What is the purpose of indexing the mempool by these five criteria?
- BIP-341: Should key-path-only P2TR be eschewed altogether?
- Was the addition of OP_NOP codes in Bitcoin 0.3.6 a hard or soft fork?
- What is the largest multisig quorum currently possible?
- What is the difference between blocksonly and block-relay-only in Bitcoin Core?
- Where are BIPs 40 and 41?

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Bitcoin Optech newsletter #206 is here:

- summarizes popular questions and answers from Bitcoin Stack Exchange
- LND 0.15.0-beta, Core Lightning 0.11.2 releases

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Changes to services and client software:

- Zeus adds taproot support
- Wasabi Wallet 2.0 released
- Sparrow adds taproot hardware signing

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Adam “Waxwing” Gibson posted to the Bitcoin-Dev mailing list a proposal for an anti-sybil mechanism that uses the Bitcoin UTXO set and which can provide reasonably good privacy. A user can generate a list of UTXOs where one of the UTXOs belongs to the user and the rest belong to other users...

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A protracted debate on the Bitcoin-Dev mailing list about the design of the Bitcoin-based Open Timestamps (OTS) system seemed to conclude this week. The source of the debate appears to have been the existence of two different designs for time stamping systems...

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A recently disclosed security vulnerability affecting many (perhaps all) popular laptop, desktop, and server CPU processors may allow attackers to discover private keys when those keys are being used to create signatures for Bitcoin transactions (or perform other similar operations)...

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Two pull requests have been opened to add support to Bitcoin Core for full Replace By Fee (RBF) as an option that is off by default. If enabled, any unconfirmed transaction in that node’s mempool could be replaced by an alternative version of that transaction which pays a higher feerate (among other rules)...

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Bitcoin Optech newsletter #205 is here:

- describes a proposed option for Bitcoin Core that would make it easier to enable transaction replacement even for transactions that don’t opt-in to BIP125
- links to information about the Hertzbleed sidechannel vulnerability
- summarizes the conclusion of a discussion about time stamping system design
- examines a new anti-sybil protocol that uses Bitcoin UTXOs
- summarizes changes to services and client software

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Developer ZmnSCPxj posted to the Lightning-Dev mailing list an argument for how optimally cheap and reliable payments could be obtained through game theoretic behavior between spenders and routing nodes...

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A recent draft BIP for package relay (see Newsletter #201) has received additional comments in the past several weeks...

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Bitcoin Optech newsletter #204 is here:

- summarizes continued discussion about adding package relay to the Bitcoin P2P network
- shares a summary of the recent LN developers meeting
- describes an argument for how spenders and routing nodes on LN can optimize for both reliability and low fees in a way that benefits both groups

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Zero-conf channels, also called turbo channels, are new single-funded channels where the funder gives some or all of their initial funds to the acceptor...

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Miniscript support in Output Descriptors is a PR authored by Antoine Poinsot and Pieter Wuille to introduce watch-only support for Miniscript in descriptors...

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Bitcoin Optech newsletter #203 is here:

- recaps the "Miniscript support in Output Descriptors" Bitcoin Core PR Review Club Meeting
- LND 0.15.0-beta.rc4 release
- adds Zero-conf channels topic

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This week, developer w0xlt posted to the Bitcoin-Dev mailing list a tutorial for creating silent payments for the default signet using a proof-of-concept implementation for Bitcoin Core...

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Bitcoin Optech newsletter #202 is here:

- describes experimentation by developers working on silent payments
- HWI 2.1.1 and LND 0.15.0-beta.rc3 releases

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Selected Q&A from Bitcoin Stack Exchange:

- How much entropy is lost alphabetising your mnemonics?
- Taproot signing with PSBT: How to determine signing method?
- How would faster blocks cause mining centralization?
- What does “waste metric” mean in the context of coin selection?
- Why isn’t OP_CHECKMULTISIG compatible with batch verification of schnorr signatures?

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Developer /dev/fd0 posted to the Bitcoin-Dev mailing list a summary of the ninth IRC meeting about OP_CHECKTEMPLATEVERIFY (CTV). Among other topics discussed during that meeting, Jeremy Rubin listed several concerns he’s heard people express about recursive covenants (which CTV does not enable). One of those concerns was creating Miner Extractable Value (MEV)...

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Gloria Zhao posted to the Bitcoin-Dev mailing list a draft BIP for package relay. This is a feature that can make CPFP fee bumping much more reliable at ensuring a child transaction can contribute fees towards getting its parent confirmed. Several contract protocols, including LN, already require reliable CPFP fee bumping, so package relay would improve their security and usability.

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