Newsletters: add 370 (2025-09-05]

Author: harding

_posts/en/newsletters/2025-09-05-newsletter.md

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+---
+title: 'Bitcoin Optech Newsletter #370'
+permalink: /en/newsletters/2025/09/05/
+name: 2025-09-05-newsletter
+slug: 2025-09-05-newsletter
+type: newsletter
+layout: newsletter
+lang: en
+---
+This week's newsletter includes our regular sections summarizing
+discussion about changing Bitcoin's consensus rules, announcing new
+release and release candidates, and describing notable changes to
+popular Bitcoin infrastructure software.
+
+## News
+
+_No significant news this week was found in any of our [sources][optech sources]._
+
+## Changing consensus
+
+_A monthly section summarizing proposals and discussion about changing
+Bitcoin's consensus rules._
+
+- **Details about the design of Simplicity:** Russell O'Connor made
+  three posts ([1][sim1], [2][sim2], [3][sim3]) so far to Delving
+  Bitcoin about "the philosophy and design of the [Simplicity
+  language][topic simplicity]."  The posts examine "the three major
+  forms of composition for transforming basic operations into complex
+  operations," "Simplicity’s type system, combinators, and basic
+  expressions," and "how to build logical operations starting from bits
+  [...up to...] cryptographic operations, such as SHA-256 and Schnorr
+  signature validation, using just our computational Simplicity
+  combinators."
+
+  The most recent post indicates further entries in the series are
+  expected.
+
+- **Draft BIP for adding elliptic curve operations to tapscript:**
+  Olaoluwa Osuntokun [posted][osuntokun ec] to the Bitcoin-Dev mailing
+  list a link to a [draft BIP][osuntokun bip] for adding several opcodes
+  to [tapscript][topic tapscript] that will allow elliptic curve
+  operations to be performed on the script evaluation stack.  The
+  opcodes are intended to be used in combination with introspection
+  opcodes to create or enhance [covenant][topic covenants] protocols in
+  addition to other advances.
+
+  Jeremy Rubin [replied][rubin ec1] to suggest additional opcodes to
+  enable additional features, as well as [other opcodes][rubin ec2] that
+  would make it more convenient to use some features provided by the
+  base proposal.
+
+- **Draft BIP for OP_TWEAKADD:** Jeremy Rubin [posted][rubin ta1] to the
+  Bitcoin-Dev mailing list a link a [draft BIP][rubin bip] to add
+  `OP_TWEAKADD` to [tapscript][topic tapscript].  He separately
+  [posted][rubin ta2] notable examples of scripts enabled by the
+  addition of the opcode, which include a script to reveal a
+  [taproot][topic taproot] tweak, proof of order of signing a
+  transaction (e.g., Alice must have signed before Bob), and [signing
+  delegation][topic signer delegation].
+
+## 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._
+
+- [Core Lightning v25.09][] is a release of a new major
+  version of this popular LN node implementation.  It adds support to
+  the `xpay` command for paying [BIP353][] addresses and simple
+  [offers][topic offers], offers improved bookkeeper support, provides
+  better plugin dependency management, and includes other new features
+  and bug fixes.
+
+- [Bitcoin Core 29.1rc2][] is a release candidate for a maintenance
+  version of the predominant full node software.
+
+## Notable code and documentation changes
+
+_Notable recent changes in [Bitcoin Core][bitcoin core repo], [Core
+Lightning][core 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], [Lightning BOLTs][bolts repo],
+[Lightning BLIPs][blips repo], [Bitcoin Inquisition][bitcoin inquisition
+repo], and [BINANAs][binana repo]._
+
+- [LDK #3726][] Improve privacy for Blinded Message Paths using Dummy Hops
+
+- [LDK #4019][] Integrate Splicing with Quiescence
+
+- [LND #9455][] discovery+lnwire: add support for DNS host name in NodeAnnouncement msg
+
+- [LND #10103][] Rate limit outgoing gossip bandwidth by peer
+
+- [HWI #795][] Fix CI <!-- don't need to mention the CI changes, but please do mention the new hardware supported by this merge -harding -->
+
+{% include snippets/recap-ad.md when="2025-09-09 16:30" %}
+{% include references.md %}
+{% include linkers/issues.md v=2 issues="3726,4019,9455,10103,795" %}
+[bitcoin core 29.1rc2]: https://bitcoincore.org/bin/bitcoin-core-29.1/
+[core lightning v25.09]: https://github.com/ElementsProject/lightning/releases/tag/v25.09
+[sim1]: https://delvingbitcoin.org/t/delving-simplicity-part-three-fundamental-ways-of-combining-computations/1902
+[sim2]: https://delvingbitcoin.org/t/delving-simplicity-part-combinator-completeness-of-simplicity/1935
+[sim3]: https://delvingbitcoin.org/t/delving-simplicity-part-building-data-types/1956
+[osuntokun ec]: https://mailing-list.bitcoindevs.xyz/bitcoindev/CAO3Pvs-Cwj=5vJgBfDqZGtvmoYPMrpKYFAYHRb_EqJ5i0PG0cA@mail.gmail.com/
+[osuntokun bip]: https://github.com/bitcoin/bips/pull/1945
+[rubin ec1]: https://mailing-list.bitcoindevs.xyz/bitcoindev/[email protected]/
+[rubin ec2]: https://mailing-list.bitcoindevs.xyz/bitcoindev/[email protected]/
+[rubin ta1]: https://mailing-list.bitcoindevs.xyz/bitcoindev/[email protected]/
+[rubin ta2]: https://mailing-list.bitcoindevs.xyz/bitcoindev/[email protected]/
+[rubin bip]: https://github.com/bitcoin/bips/pull/1944