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Podcast: add 261 recap
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_posts/en/newsletters/2023-07-26-newsletter.md

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No comments on Russell's proposal had been posted to the mailing
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list as of this writing but some initial comments had been posted to
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his [pull request][bolts #1096] with the complete proposal.
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his [pull request][bolts #1096] with the complete proposal. {% assign timestamp="1:03" %}
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- **LN Summit notes:** Carla Kirk-Cohen [posted][kc notes] to the
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Lightning-Dev mailing list a summary of several discussions from the
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recent meeting of LN developers in New York City. Some of the topics
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discussed included:
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discussed included: {% assign timestamp="10:48" %}
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- *Reliable transaction confirmation:* [package relay][topic package
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relay], [v3 transaction relay][topic v3 transaction relay],
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Andrew Poelstra gives an overview of computation-by-hand verification
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techniques, like [codex32][news239 codex32], before walking through how a
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public key could be hand-derived from a private key, a process he estimates would
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take at least 1500 hours, even with process optimizations.
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take at least 1500 hours, even with process optimizations. {% assign timestamp="57:18" %}
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- [Why are there 17 native segwit versions?]({{bse}}118974)
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Murch explains that [segwit][topic segwit] defined 17 values (0-16) for the
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[witness version][bip141 witness program] field because of the existing availability of constant
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opcodes OP_0...OP_16 in [Script][wiki script]. He notes that additional
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numbers would require the use of less data-efficient `OP_PUSHDATA` opcodes.
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numbers would require the use of less data-efficient `OP_PUSHDATA` opcodes. {% assign timestamp="59:43" %}
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- [Does `0 OP_CSV` force the spending transaction to signal BIP125 replaceability?]({{bse}}115586)
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Murch points to a [discussion][rbf csv discussion] confirming that since both
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the `OP_CHECKSEQUENCEVERIFY` (CSV) [timelock][topic timelocks] and
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Replace-by-Fee ([RBF][topic rbf]) are [enforced]({{bse}}87376) using the `nSequence` field, an
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output with `0 OP_CSV` requires the spending transaction to signal
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[BIP125][] replaceability.
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[BIP125][] replaceability. {% assign timestamp="1:03:04" %}
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- [How do route hints affect pathfinding?]({{bse}}118755)
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Christian Decker explains two reasons an LN recipient would provide a sender
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with route hints. One reason is if the recipient is using [unannounced
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channels][topic unannounced channels] and hints are needed to help find a
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route. The other reason is to provide the sender with a list of channels that
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have sufficient balance to complete the payment, a technique he refers to as route boost.
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have sufficient balance to complete the payment, a technique he refers to as route boost. {% assign timestamp="1:08:23" %}
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- [What does it mean that the security of 256-bit ECDSA, and therefore Bitcoin keys, is 128 bits?]({{bse}}118928)
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Pieter Wuille clarifies that due to algorithms that can derive a private key
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from a public key more efficiently than a brute-force search, 256-bit ECDSA
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only provides 128-bit security. He goes on to point out the difference between
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individual key security as compared to [seed][topic bip32] security.
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individual key security as compared to [seed][topic bip32] security. {% assign timestamp="1:12:26" %}
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## Releases and release candidates
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- [HWI 2.3.0][] is a release of this middleware that allows software
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wallets to communicate with hardware signing devices. It adds support
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for DIY Jade devices and a binary for running the main `hwi` program
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on Apple Silicon hardware with MacOS 12.0+.
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on Apple Silicon hardware with MacOS 12.0+. {% assign timestamp="1:15:09" %}
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- [LDK 0.0.116][] is a release of this library for creating LN-enabled
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software. It includes support for [anchor outputs][topic anchor
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outputs] and [multipath payments][topic multipath payments] with
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[keysend][topic spontaneous payments].
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[keysend][topic spontaneous payments]. {% assign timestamp="1:16:37" %}
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## Notable code and documentation changes
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- [Bitcoin Core GUI #740][] updates the [PSBT][topic psbt] operations dialog to mark outputs
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paying your own wallet with “own address”. This eases assessment of an
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imported PSBT’s outcome, especially that the transaction returns change to
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the sender.
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the sender. {% assign timestamp="1:17:18" %}
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{% include references.md %}
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{% include linkers/issues.md v=2 issues="740,1096" %}
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---
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title: 'Bitcoin Optech Newsletter #261 Recap Podcast'
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permalink: /en/podcast/2023/07/27/
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reference: /en/newsletters/2023/07/26/
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name: 2023-07-27-recap
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slug: 2023-07-27-recap
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type: podcast
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layout: podcast-episode
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lang: en
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---
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Mark "Murch" Erhardt and Mike Schmidt are joined by Greg Sanders and Bastien Teinturier to discuss [Newsletter #261]({{page.reference}}).
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{% include functions/podcast-links.md %}
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{% include functions/podcast-player.md url="https://d3ctxlq1ktw2nl.cloudfront.net/staging/2023-6-27/340927362-44100-2-605437ca1324d.m4a" %}
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{% include newsletter-references.md %}
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## Transcription
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_transcription coming soon_
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{% include references.md %}

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