Bitcoin TLDR

#83

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Summary

Jun 24 - Jun 30, 2025

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

Ava Chow announced the release of Bitcoin Core 28.2, which introduces new features, bug fixes, and performance enhancements, aiming to make the software more accessible globally. This version, available for download on the Bitcoin Core website, maintains compatibility with older wallet versions and supports a wide range of operating systems. It emphasizes the importance of community contributions, acknowledging individuals like 0xB10C, achow101, and Sjors Provoost for their roles in the development process. Significant changes include improved build processes, compatibility adjustments, and documentation updates, with detailed instructions provided for upgrading from older versions.

In a separate discussion, roasbeef proposes reimagining onion messaging within the Lightning Network (LN) to address limitations of the current model by establishing an overlay layer bootstrapped using the LN gossip layer. This approach aims to enhance deployment speed, privacy, and payment efficiency by reducing reliance on the channel graph, allowing for incremental adoption and facilitating key management improvements. The technical foundation for the overlay involves a series of TLV-based handshake messages for secure onion messaging link establishment, promising better scalability, flexibility, and innovation in LN communications. The proposal, detailed at Delving Bitcoin, highlights the potential for a more efficient and private messaging infrastructure within the LN ecosystem.

Active Discussions

CTV + CSFS: a letter

63 replies

By Saint Wenhao

Involving James OBeirne, Matt Corallo+21 others

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Original post on June 9, 2025 11:40 UTC

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Last reply on June 28, 2025 16:13 UTC

bitcoin-dev

  • Bitcoin development critiques BIP-300 for complexity, suggesting simpler Script-based solutions.

  • A proposed method involves a Proof of Work mechanism in transaction outputs, adjustable by size.

  • This could enable decentralized sidechains without consensus changes, further research on merged mining needed.

What's a good stopping point? Making the case for the capabilities enabled by CTV+CSFS

7 replies

By Harsha Goli

Involving Antoine Poinsot, Chris Stewart+4 others

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Original post on June 23, 2025 13:14 UTC

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Last reply on July 10, 2025 14:33 UTC

bitcoin-dev

  • Matt Corallo initiated a discussion on Bitcoin's transaction capabilities.

  • The focus is on implementing commitments and signature verifications for transactions.

  • Community feedback is sought to refine these proposals, impacting future Bitcoin forks.

Sybil resistance in different coinjoin implementations

3 replies

By /dev /fd0

Involving waxwing/ AdamISZ

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Original post on May 27, 2025 14:29 UTC

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Last reply on June 25, 2025 12:53 UTC

bitcoin-dev

  • A new UTXO value calculation formula has been proposed, drawing both praise and suggestions for improvement.

  • The strategy discusses deterring Sybil attacks and explores vulnerabilities within fidelity bond systems.

  • The ongoing dialogue calls for refining economic deterrents to thwart sophisticated attacks in the cryptocurrency ecosystem.

Who will run the CoinJoin coordinators?

22 replies

By 1440000bytes

Involving AdamISZ, kravens+3 others

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Original post on June 2, 2024 10:01 UTC

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Last reply on June 24, 2025 00:46 UTC

delvingbitcoin

  • A new whirlpool coordinator raises security concerns in the crypto community.

  • Identified vulnerabilities could endanger user security and privacy.

  • The community discusses solutions to enhance the coordinator's security framework.

How CTV+CSFS improves BitVM bridges

21 replies

By Chris_Stewart_5

Involving JeremyRubin, ajtowns+7 others

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Original post on April 10, 2025 14:28 UTC

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Last reply on June 25, 2025 19:39 UTC

delvingbitcoin

  • OP_CTV enhances Bitcoin transaction security by linking two inputs securely.

  • Initial tests showed a loophole by substituting a second input, revealing a vulnerability.

  • Efforts to refine generated complexity in creating valid signatures, facing technical barriers.

Correcting the error in getnetwork - hashrateps

12 replies

By zawy

Involving sipa

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Original post on June 2, 2025 10:53 UTC

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Last reply on July 12, 2025 10:32 UTC

delvingbitcoin

  • The email debates the efficiency of hashrate versus work in Proof of Work protocols.

  • It reveals a scenario where different difficulty levels in mining yield equal work but vary in hashrate efficiency.

  • A million-trial simulation to examine hashrate and work discrepancy suggests alternative methods for better accuracy.

Fee-Based Spam Prevention For Lightning

12 replies

By ClaraShk

Involving JohnLaw, harding

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Original post on March 14, 2025 23:58 UTC

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Last reply on July 14, 2025 13:26 UTC

delvingbitcoin

  • The email examines opportunity cost for a payment channel slot locked for two weeks.

  • It calculates this cost as 10,000 sats, using the formula for two-minute intervals over two weeks.

  • This demonstrates the economic impact of long-duration payment resolutions on node efficiency.

Fingerprinting nodes via addr requests

8 replies

By 0xB10C

Involving Crypt-iQ, danielabrozzoni+2 others

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Original post on June 23, 2025 13:31 UTC

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Last reply on June 30, 2025 10:13 UTC

delvingbitcoin

  • A method suggests identifying Sybil nodes by analyzing IPv4 address responses to enhance security.

  • Analyzing addr responses may reveal vulnerabilities and attempts at network exploitation.

  • Continuous cybersecurity innovation is essential for defending against sophisticated network threats.

Why CTV+CSFS and not TXHASH

1 reply

By ProofOfKeags

Involving arshbot

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Original post on June 18, 2025 18:11 UTC

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Last reply on June 24, 2025 19:12 UTC

delvingbitcoin

  • TXHASH complements CSFS, indicating unique roles in their technological ecosystem.

  • TXHASH fully replaces CTV, suggesting advancements or enhanced features over CTV.

  • These relationships impact decisions on system architecture and development.

Where does the 33.33% threshold for selfish mining come from?

1 reply

By zawy

Involving AntoineP

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Original post on June 5, 2025 20:26 UTC

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Last reply on July 25, 2025 14:04 UTC

delvingbitcoin

  • Achieving secure consensus in blockchain requires more than a 51% majority, ideally 66.67%.

  • Bitcoin's approach to timestamps and digital signing does not fully meet security criteria.

  • Stricter timestamp regulations and a timeout system are proposed to enhance consensus security.

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