Bitcoin TLDR

#129

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Summary

Jul 20 - Jul 26, 2026

Our weekly newsletter is focused on keeping you updated on what's new in Bitcoin, and summarizes the bitcoin-dev, lightning-dev and delving bitcoin mailing lists

The developer community has released the 6th public iteration of the Backbone project, enhancing quality assurance and integrating bitcoind's Python functional tests for a more robust multi-daemon process Backbone project. This version also includes improved CLI control and the use of bitcoind’s testing framework for better network and peer-to-peer testing, with a demo available for Linux users at ./functional-test/p2p_addrelay_connection.py.

Bitcoin Core's latest updates feature versions 30.3 and 29.4, both enhancing system performance through bug fixes and new features, with extended compatibility across modern operating systems Bitcoin Core 30.3 and Bitcoin Core 29.4. Notable improvements include the resolution of a chainstate database issue and the support of old wallet versions, alongside enhancements in transaction handling and network interfaces.

In an exploration of variable difficulty management in mining pools, the deployment of Stratum V2 demonstrates a sophisticated control of difficulty settings across network nodes, optimizing miner contribution tracking and reward distribution Variable difficulty management. This analysis underscores the necessity of placing control loops at network "frontiers" to maintain accurate difficulty adjustments and system integrity.

The release of Bitcoin Inquisition version 29.4 introduces several consensus changes aimed at enhancing transaction security and functionality, with significant updates activated on the default signet Bitcoin Inquisition 29.4. These updates include support for BIP 118 and BIP 119, among others, to improve transaction flexibility and verification processes.

Active Discussions

Quantum Recovery Of Hashed Address Secured Coins With No Confiscatory Risk

4 replies

By shinobimonkey

Involving conduition

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Original post on July 14, 2026 16:39 UTC

cyclic icon

Last reply on July 24, 2026 00:39 UTC

bitcoin-dev

  • The email outlines strategies to enhance coin recovery via layered recovery schemes.

  • Methods include additive encumbrances, commit-reveal schemes, and quantum-safe proofs.

  • It discusses enhancing public key secrecy and seeks feedback on the approach.

BIP draft: CISA for Taproot Key Path Spends

3 replies

By waxwing/ AdamISZ

Involving Fabian, conduition

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Original post on July 18, 2026 12:39 UTC

cyclic icon

Last reply on July 28, 2026 20:18 UTC

bitcoin-dev

  • Participants discussed improving transaction aggregation in blockchain tech.

  • Technical challenges hinder collaborative aggregation, limiting current system flexibility.

  • A proposed 'group ID' in transaction markers could affect privacy by revealing group participants.

The game-theory problems of PQ sunsetting modes

2 replies

By Antoine Riard

Involving conduition

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Original post on July 12, 2026 18:34 UTC

cyclic icon

Last reply on July 26, 2026 23:45 UTC

bitcoin-dev

  • Implementing sunset forks in crypto blockchains with CQRCs presents considerable challenges.

  • Miners may halt work on legitimate chains for potential gains on alternate revisions.

  • Periodic, secure checkpoints could limit blockchain reorganization and enhance security.

Testnet 4 difficulty/hashrate

2 replies

By Ali Sherief

Involving Anthony Towns, Antoine Poinsot

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Original post on June 5, 2026 10:00 UTC

cyclic icon

Last reply on July 26, 2026 00:03 UTC

bitcoin-dev

  • Developers face severe challenges in Bitcoin-related library testing.

  • Transactions delay in testnet4 impacts app development efficiency.

  • Blockchain workflows need enhancements for effective testing environments.

Addressing the Diminishing Block Subsidy

26 replies

By show1225

Involving ajtowns, cmp_ancp+10 others

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Original post on June 23, 2026 15:33 UTC

cyclic icon

Last reply on July 23, 2026 22:49 UTC

delvingbitcoin

  • Concerns about Bitcoin's stability post-2040 arise due to potential decreases in mining rewards.

  • Proposals suggest balancing economic responsibilities between holders and spenders in the Bitcoin ecosystem.

  • The sender advocates for proactive, non-inflationary modifications to Bitcoin's protocol for stability.

A Bitcoin-native LLM: dataset, architecture and open questions

21 replies

By brenorb

Involving Tsua00021, 0xB10C+7 others

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Original post on June 2, 2026 14:11 UTC

cyclic icon

Last reply on July 22, 2026 20:51 UTC

delvingbitcoin

  • The engineer developed Minimaxis and contributed to Liquid support tools at SoS.

  • They're currently focusing on Freedom Skills to enhance instruction-following LLMs.

  • They advocate for specialized datasets to streamline data scientists' workflows.

[Research] A clockless vardiff strands a slowing miner

7 replies

By gimballock

Involving ajtowns, paratoxicdev

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Original post on July 15, 2026 06:12 UTC

cyclic icon

Last reply on July 25, 2026 15:16 UTC

delvingbitcoin

  • Miners connect to pools via a proxy, allowing direct interaction and observation.

  • The proxy's liveness checks every 30 seconds help identify non-responsive miners.

  • Pool system flaws include inaccurate performance estimates for individual miners.

The Four Horsemen

2 replies

By Kruw

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Original post on July 18, 2026 00:23 UTC

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Last reply on July 20, 2026 10:54 UTC

delvingbitcoin

  • The Four Horsemen project has upgraded servers with advanced processors for enhanced performance.

  • Enhanced encryption and firewalls improve data safety as project operations expand.

  • New energy-efficient components aim to reduce the servers' carbon footprint, aligning with organizational goals.

RFC: Block-Range Filters (a.k.a. Hierarchical filters)

1 reply

By nothingmuch

Involving optout

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Original post on July 22, 2026 09:07 UTC

cyclic icon

Last reply on July 22, 2026 16:01 UTC

delvingbitcoin

  • Advanced data structures enhance set membership queries, with quotient filters promising efficiency.

  • Challenges in block querying due to malicious transaction ID collisions necessitate low false positive rates.

  • Innovations in blockchain technology may eventually make current complex systems obsolete.

Post Quantum Recovery Of Hashed Addresses With No Confiscatory Risk

1 reply

By shinobi

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Original post on July 14, 2026 16:55 UTC

cyclic icon

Last reply on July 24, 2026 00:40 UTC

delvingbitcoin

  • The email proposes enhanced security for cryptocurrency with multiple recovery schemes.

  • Strategies include Xpub derivation-based recovery and stateful timestamped proofs.

  • The sender aims for 100% recovery coverage and seeks feedback on the proposal.

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