Newsletters: add 186 (2022-02-09)

Author: harding

_posts/en/newsletters/2022-02-09-newsletter.md

@@ -0,0 +1,104 @@
+---
+title: 'Bitcoin Optech Newsletter #186'
+permalink: /en/newsletters/2022/02/09/
+name: 2022-02-09-newsletter
+slug: 2022-02-09-newsletter
+type: newsletter
+layout: newsletter
+lang: en
+---
+This week's newsletter describes a discussion about changing relay
+policy for replace-by-fee transactions and includes our regular sections
+with the summary of a Bitcoin Core PR Review Club meeting, announcements
+of new releases and release candidates, and descriptions of notable
+changes to popular Bitcoin infrastructure projects.
+
+## News
+
+- **Discussion about RBF policy:** Gloria Zhao started a
+  [discussion][zhao rbf] on the Bitcoin-Dev mailing list about
+  Replace-by-Fee ([RBF][topic rbf]) policy.  Her email provides
+  background on the current policy, enumerates several problems
+  discovered with it over the years (such as [pinning attacks][topic
+  transaction pinning]), examines how the policy affects wallet user
+  interfaces, and then describes several possible improvements.
+  Significant attention is given to improvement ideas based on
+  considering transactions within the context of the next block
+  template---the proposed block a miner would create and then commit to
+  when attempting to produce a proof of work.  By evaluating the impact
+  of a replacement on the next block template, it's possible to
+  determine for certain, without the use of heuristics, whether or not
+  it will earn the miner of that next block more fee income.  Several
+  developers replied with comments on Zhao's summary and her proposals,
+  including additional or alternative proposals for changes that
+  could be made.
+
+    Discussion appeared to be ongoing as this summary was being written.
+
+## Bitcoin Core PR Review Club
+
+*In this monthly section, we summarize a recent [Bitcoin Core PR Review Club][]
+meeting, highlighting some of the important questions and answers.  Click on a
+question below to see a summary of the answer from the meeting.*
+
+FIXME:glozow
+
+{% include functions/details-list.md
+  q0="FIXME"
+  a0="FIXME"
+  a0link="https://bitcoincore.reviews/23443#l-29"
+%}
+
+## Releases and release candidates
+
+*New releases and release candidates for popular Bitcoin infrastructure
+projects.  Please consider upgrading to new releases or helping to test
+release candidates.*
+
+- [LND 0.14.2-beta][] is the release for a
+  maintenance version that includes several bug fixes and a few minor
+  improvements.
+
+## Notable code and documentation changes
+
+*Notable changes this week in [Bitcoin Core][bitcoin core repo],
+[C-Lightning][c-lightning repo], [Eclair][eclair repo], [LDK][ldk repo],
+[LND][lnd repo], [libsecp256k1][libsecp256k1 repo], [Hardware Wallet
+Interface (HWI)][hwi repo], [Rust Bitcoin][rust bitcoin repo], [BTCPay
+Server][btcpay server repo], [BDK][bdk repo], [Bitcoin Improvement
+Proposals (BIPs)][bips repo], and [Lightning BOLTs][bolts repo].*
+
+- [Bitcoin Core #23508][] Add getdeploymentinfo RPC FIXME:Xekyo
+
+- [Bitcoin Core #21851][] release: support cross-compiling for arm64-apple-darwin FIXME:adamjonas
+
+- [Bitcoin Core #16795][] updates the `getrawtransaction`, `gettxout`,
+  `decoderawtransaction`, and `decodescript` RPCs to return the inferred
+  [output script descriptor][topic descriptors] for any scriptPubKeys
+  that are decoded.
+
+- [LND #6226][] sets 5% as the default fee for payments routed through
+  LN when created using the legacy `SendPayment`, `SendPaymentSync`, and
+  `QueryRoutes` RPCs.  Payments sent using the newer `SendPaymentV2` RPC
+  default to zero fees, essentially requiring users to specify a value.
+  An additional merged PR, [LND #6234][], defaults to 100% fees for
+  payments of less than 1,000 satoshis made with the legacy RPCs.
+
+- [LND #6177][] allows the users of the [HTLC][topic HTLC] interceptor
+  to specify the reason an HTLC was failed, making the interceptor more
+  useful for testing how failures affect software using LND.
+
+- [Rust-Lightning #1227][] Merge pull request #1227 from jkczyz/2021-12-probabilistic-scorer FIXME:dongcarl
+
+- [HWI #549][] adds support for [PSBT][topic psbt] version two as
+  specified in [BIP370][].  When using a device that natively supports
+  version zero PSBT, such as existing Coldcard hardware signing devices,
+  v2 PSBTs are translated to v0 PSBTs.
+
+- [HWI #544][] adds support for receiving and spending [taproot][topic
+  taproot] payments with Trezor hardware signing devices.
+
+{% include references.md %}
+{% include linkers/issues.md v=1 issues="23508,21851,16795,6226,6234,6177,1227,549,544" %}
+[lnd 0.14.2-beta]: https://github.com/lightningnetwork/lnd/releases/tag/v0.14.2-beta
+[zhao rbf]: https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2022-January/019817.html

_topics/en/psbt.md

@@ -177,6 +177,9 @@ optech_mentions:
   - title: "BIPs #1270 updates the PSBT specification to discourage signature placeholders"
     url: /en/newsletters/2022/01/26/#bips-1270
 
+  - title: "HWI #549 adds support for PSBT version 2"
+    url: /en/newsletters/2022/02/09/#hwi-549
+
 ## Optional.  Same format as "primary_sources" above
 see_also:
   - title: Output Script Descriptors

_topics/en/replace-by-fee.md

@@ -92,6 +92,9 @@ optech_mentions:
   - title: Proposal to briefly allow full RBF before using default opt-in RBF
     url: /en/newsletters/2022/01/05/#brief-full-rbf-then-opt-in-rbf
 
+  - title: "Discussion about RBF policy, including suggested changes"
+    url: /en/newsletters/2022/02/09/#discussion-about-rbf-policy
+
 ## Optional.  Same format as "primary_sources" above
 see_also:
   - title: Opt-in RBF FAQ