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TLDR

Stay up to Date on the Latest in Bitcoin Tech

Weekly summaries of bitcoin-dev, lightning-dev, and Delving Bitcoin mailing lists
Keep your finger on the pulse of bitcoin tech development and conversations
Perfect for bitcoin builders, educators, and contributors to stay on top of a growing field

Bitcoin TLDR

#121

May 18 - May 18, 2026

Catch up on This Week's Activity

This strategic guidance, circulating within a platform dedicated to Bitcoin development, underscores the importance of informed technology choices to enhance project outcomes. This insight supports developers in making decisions that uphold the safety and effectiveness of their technological implementations.

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We focus on enabling devs to learn, practice, and build with bitcoin.

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Bitcoin TLDR

#121

May 18 - May 18, 2026

In the context of peer-to-peer (P2P) networks, it is advised that developers opt for downloads from trusted sources when security is not a paramount concern, emphasizing the alignment of network choices with project-specific security needs. This recommendation is particularly relevant to those working in fields like Bitcoin development, where the integrity and reliability of data sources are crucial. [Read more about the discussion](https://gnusha.org/pi/bitcoindev/CmNC-9nAajMwaJi6dHTdlpgjzLZazPlMjGAxNT8DJXAnyw2sUKCygJJU4BLqaF8OYw3carG_pt1Rriqu66OG3wQ8u2itVlJCFo1AhI3V4es=@protonmail.com/T/#m2deb40377f73901c4e5eaaba7b080fd92e4c5189) This strategic guidance, circulating within a platform dedicated to Bitcoin development, underscores the importance of informed technology choices to enhance project outcomes. This insight supports developers in making decisions that uphold the safety and effectiveness of their technological implementations.

Bitcoin TLDR

#120

May 17 - May 17, 2026

UltrafastSecp256k1 v4.0 introduces a significant upgrade to the cryptographic capabilities of Bitcoin Core, providing an alternative backend that enhances performance without replacing the existing libsecp256k1. The new engine, which integrates seamlessly through a shim layer compatible with the `secp256k1.h` API, allows for easy switching between cryptographic backends during the build process using a simple CMake flag. This compatibility ensures that all previous functionalities of Bitcoin Core are retained, facilitating controlled performance assessments and selective usage under specific conditions. Performance tests on UltrafastSecp256k1 v4.0, using an Intel i5-14400F processor, demonstrate up to 35% faster transaction signing and script verification speeds, and modest improvements in block validation through mixed signature operations. These benchmarks are well-documented, reproducible, and available for review in the project’s repository documentation ([BITCOIN_CORE_BENCH_RESULTS.json](https://github.com/shrec/UltrafastSecp256k1/blob/01164b75e38bf8565c9be7f595f97a60ba1decf6/docs/BITCOIN_CORE_BENCH_RESULTS.json)). In terms of security, the new version scores a perfect 100/100 on the Continuous Audit and Assurance System (CAAS), thoroughly examining each commit against potential attack vectors and CVEs to ensure robustness. Additionally, the adherence to best practices such as deterministic builds and Secure Software Supply Chain (SLSA) provenance marks a significant step towards enhancing transparency and reliability in software development and distribution. Overall, UltrafastSecp256k1 v4.0 represents a substantial enhancement in the security and performance of Bitcoin Core’s cryptographic functions, backed by rigorous documentation and continuous integration across various platforms. This makes it an invaluable asset for developers and researchers within the cryptographic community. For further details, the complete suite of documentation and tools can be accessed on the project’s GitHub page ([UltrafastSecp256k1](https://github.com/shrec/UltrafastSecp256k1)).

Bitcoin TLDR

#119

Mar 16 - Mar 22, 2026

Saint Wenhao proposed a new Bitcoin output type, Pay to Schnorr Key Hash (P2SKH), merging the benefits of P2WPKH and P2TR to optimize transaction efficiency through a compact 22-byte scriptPubKey and a 64-byte Schnorr signature. This approach enhances privacy by not exposing the public key until a transaction occurs, though it introduces computational overhead and necessitates discussions on witness versioning and naming conventions. For more details, see the [full draft](https://github.com/sashabeton/bips/blob/3cb9e07984b571e9510370ab7e7218620be580dc/p2skh.md) and [PoC implementation](https://github.com/bitcoin/bitcoin/pull/34826). Ladder Script, a draft Bitcoin Improvement Proposal, aims to revolutionize Bitcoin transactions by introducing typed, structured spending conditions to simplify the construction of complex conditional logic, enhance script extensibility, and improve privacy. By adopting a ladder logic model and supporting post-quantum signatures, the proposal presents a forward-looking framework for transaction validation that addresses current limitations without requiring new opcodes. Detailed resources and the proposal's code can be found at [https://bitcoinghost.org/labs/](https://bitcoinghost.org/labs/) and [GitHub](https://github.com/defenwycke/ghost-labs-ladder-script). The Bitcoin Transaction Schema Language (BTSL) proposes a novel declarative approach to standardizing PSBT validation, aiming to simplify multi-party transactions by addressing the challenges of trust in coordinator logic. BTSL facilitates a more secure and independent validation process, potentially enhancing hardware wallet implementations by allowing for independent verification of transaction invariants. This experimental proposal, still in the prototype stage, invites community feedback to refine its approach, with further information available at the [BTSL Standard](https://github.com/tsua0002/btsl-standard). UltrafastSecp256k1 v3.3 significantly advances the performance and security of the secp256k1 library, offering substantial improvements in batch operations and security against vulnerabilities. This update, beneficial for various cryptocurrency applications, highlights the project's commitment to enhancing infrastructure through open-source collaboration, with the latest release and further details available at [GitHub](https://github.com/shrec/UltrafastSecp256k1/releases/tag/v3.3). Eddy, a daemon for the Lightning Network, introduces a novel solution for cooperative circular rebalancing without routing fees, fostering a more efficient utilization of network liquidity. Through LND's `RESUME_MODIFIED` feature, Eddy enables fee-free rebalances by allowing nodes to waive fees mutually, a development in its MVP stage seeking community input to enhance its functionality. Interested parties can review and contribute to the project at [GitHub](https://github.com/wactario/eddy). Lastly, a proposal to disable the min-difficulty rule on Testnet4 aims to address the exploitation by CPU miners and improve the network's functionality by enforcing standard difficulty rules. Scheduled for a hard fork at block height 201,600, the proposal seeks to normalize difficulty levels without resetting and has initiated discussions on its implications and the necessity of a Bitcoin Improvement Proposal (BIP). Additional details and community perspectives are available through the proposed [GitHub pull request](https://github.com/bitcoin/bitcoin/pull/34420) and related discussions on developer platforms and forums.

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What People Have to Say

Alex B

@bergealex4

@adamcjonas Very happy someone finally built this.

Have you considered threading the replies/summaries on a single page and nest original posts to avoid navigation back n forth?

satsie

@satsie

@adamcjonas 👏🏼🎉🕺

aljaz

@aaaljaz

This is amazing🎉 https://t.co/yG9cqCKNKQ

calle

@callebtc

This is an amazing project and will help so many more people to participate in the Bitcoin thought process.

🕊️🙏🧡 https://t.co/20JTzruYLM

₿ Steve Lee | #TeamSlowAndSteady

@moneyball

@adamcjonas Really cool! Nice work

calle

@callebtc

@adamcjonas Wow! Fantastic work!

Alyssa Ferris

@mehmehturtle

This is awesome, it's tough trying to stay up to date on all the cool new ideas flowing throw the developer mailing lists. These summaries make following a long a little bit easier.

Side note: show this to anyone who thinks bitcoin isn't innovating 🤪 https://t.co/TujnRCiYXZ

Timechain

@timechain_

This is amazing. Well needed. https://t.co/Ok4jHw2MnQ

Botanix Labs 🕷

@BotanixLabs

@adamcjonas Great idea 👏👏

Simply Bitcoin

@SimplyBitcoinTV

TLDR is a platform summarizing technical discussions from bitcoin-dev and lightning-dev mailing lists; simplifying them for readers and thus making high-signal discussions about #bitcoin and lightning easier to navigate 🧭

Check it out 👇 https://t.co/lCpjQuZPQc @adamcjonas