Bitcoin TLDR

#84

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Summary

Jun 30 - Jul 6, 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

Antoine Poinsot highlighted concerns over the potential denial-of-service (DoS) risks associated with activating BIP54 in Bitcoin, given the existence of 2500 legacy signature operations that could be invalidated and lead to non-compliance under current standards. This scenario underscores the fragility in the network's defenses against DoS attacks by unupgraded miners. To mitigate these risks, a proposal has been made to deem such transactions as non-standard, delaying BIP54's activation until there is significant assurance of network-wide hash rate support. This cautious approach, captured in Bitcoin Core PR 32521, aims for inclusion in the upcoming 30.0 release, reflecting a proactive stance on network security and stability. More details

In another discussion, a 16-year-old Bitcoin enthusiast, referred to as BitMan, proposed developing a fully open-source, community-driven satellite communication system akin to Elon Musk's Starlink for Bitcoin. This ambitious project aims to allow users to broadcast transactions and update the blockchain independently of centralized internet service providers, enhancing Bitcoin's resilience and censorship resistance. Despite acknowledging the significant financial and technical hurdles, the proposal is driven by a vision of true decentralization and global accessibility for Bitcoin, striving for operation almost entirely off-grid. Read more

Lastly, Josh introduced a new library inspired by a comment from @sjors on a Bitcoin pull request, aimed at reducing QR code sizes for wallets by 30-40% through more efficient encoding of descriptors, including those with private keys. This advancement enhances QR and NFC communication reliability, facilitating easier sharing and storage of complex multisig configurations. The library, which supports a wide range of descriptors and features a straightforward API for encoding and decoding, signifies a step forward in making Bitcoin wallet coordination more efficient and user-friendly. The encoder's development is a testament to the community's ongoing efforts to improve Bitcoin's usability and accessibility, with further information and documentation available on GitHub and docs.rs. Explore the library

Active Discussions

Unbreaking testnet4

32 replies

By Garlo Nicon

Involving Saint Wenhao, Sjors Provoost+9 others

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Original post on March 18, 2025 14:29 UTC

cyclic icon

Last reply on July 5, 2025 04:31 UTC

bitcoin-dev

  • A proposal suggests increasing Bitcoin's block time from 10 to 20 minutes to improve mining issues.

  • It aims to balance CPU and ASIC mining, enhancing network decentralization and security.

  • Techniques for better time synchronization across the network are also introduced.

DahLIAS: Discrete Logarithm-Based Interactive Aggregate Signatures

11 replies

By Tim Ruffing

Involving waxwing/ AdamISZ, Jonas Nick

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Original post on April 17, 2025 16:27 UTC

cyclic icon

Last reply on July 17, 2025 13:15 UTC

bitcoin-dev

  • Utilizing a singular ephemeral identifier in digital signatures enhances operational efficiency.

  • This method allows distinguishing participants without direct public key uniqueness checks.

  • Despite limited disruption detection, secure communication aids in participant verification.

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

10 replies

By Anthony Towns

Involving Antoine Poinsot, Antoine Riard+6 others

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Original post on June 23, 2025 13:14 UTC

cyclic icon

Last reply on July 10, 2025 14:33 UTC

bitcoin-dev

  • The Bitcoin Development Mailing List explores advanced scripting for Bitcoin enhancements.

  • Chris Stewart demonstrated bllsh's introspection with a potential for a different approach through Rusty's OP_TX.

  • Shared code ensures UTXO spends only with its sibling output, advancing transaction verification methods.

OP_CAT Enables Winternitz Signatures

2 replies

By Anthony Towns

Involving conduition

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Original post on June 8, 2025 03:20 UTC

cyclic icon

Last reply on July 8, 2025 08:07 UTC

bitcoin-dev

  • Anthony Towns suggests a new method for efficient four-bit to eight-bit conversion.

  • He addresses handling special values and a recent server issue affecting transactions.

  • For further Bitcoin development discussions, he directs to the Bitcoin Development Mailing List.

CTV+CSFS: Can we reach consensus on a first step towards covenants?

79 replies

By ajtowns

Involving instagibbs, jamesob+14 others

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Original post on March 10, 2025 22:58 UTC

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Last reply on July 14, 2025 13:13 UTC

delvingbitcoin

  • Per-hop blinding increases privacy in transactions through unique constants per transaction hop.

  • It uses `R1` and `R2` values, with `R2` generated from `R1` plus a constant and public key.

  • This method secures fund claims and maintains transaction anonymity without revealing value links on the blockchain.

CTV, APO, CAT activity on signet

20 replies

By ajtowns

Involving 1440000bytes, fiatjaf+3 others

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Original post on November 14, 2024 17:34 UTC

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Last reply on July 3, 2025 08:10 UTC

delvingbitcoin

  • Exploration of simple-ctv-spacechain shows innovative CTV blockchain transactions with varied lengths.

  • December observed `CHECKSIGVERIFY CTV DROP` experiments; April had a unique `IF 1 CSV DROP CTV ELSE CTV ENDIF` transaction.

  • Ongoing CTV experimentation from November to April indicates evolving blockchain transaction capabilities.

Fee-Based Spam Prevention For Lightning

14 replies

By JohnLaw

Involving ClaraShk, 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

  • Understanding router economics in cryptocurrency needs a broad view of costs and risks.

  • Capital utilization myths inflate expected earnings, overlooking realistic financial returns.

  • Transaction chains amplify costs, requiring significant capital staking for efficiency.

Correcting the error in getnetwork - hashrateps

13 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 refined blockchain calculation method offers more accurate hashrate and work measurements.

  • The new formula considers actual timespan across blocks, enhancing accuracy without outdated corrections.

  • This approach aids in accurately comparing blockchain tips and determining the leading tip's effort.

Reimagining Onion Messages as an Overlay Layer

9 replies

By roasbeef

Involving MattCorallo, ZmnSCPxj+2 others

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Original post on June 28, 2025 01:56 UTC

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Last reply on July 8, 2025 23:04 UTC

delvingbitcoin

  • LN nodes store `node_announcement` only for actively maintained channels.

  • `Onion_link_proof` requires both involved nodes to have active channels for network acceptance.

  • LN's integration of onion routing leverages channel graph structure for privacy and efficiency.

Fingerprinting nodes via addr requests

8 replies

By danielabrozzoni

Involving 0xB10C, Crypt-iQ+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

  • The blog explores a fingerprint attack on nodes across networks, emphasizing privacy and network threats.

  • Research in January 2025 studied Bitcoin Core nodes, revealing significant IPv4 and Tor address response differences.

  • Proposed mitigation includes randomizing `ADDR` message timestamps, with community input sought to improve privacy and security.

Understanding and Mitigating a OP_CTV Footgun: The Unsatisfiable UTXO

5 replies

By Chris_Stewart_5

Involving 1440000bytes, instagibbs+1 other

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Original post on July 3, 2025 20:09 UTC

cyclic icon

Last reply on July 10, 2025 20:13 UTC

delvingbitcoin

  • Vaults combined with notification services offer a nuanced method for transaction management using `OP_CTV`.

  • Traditional watchtower roles are limited, necessitating pre-informed monitoring to preempt amount mismatches.

  • Proposing a shift to templates committing to multiple inputs enhances corrective measures for fund safety.

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

4 replies

By zawy

Involving AntoineP, ajtowns

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Original post on June 5, 2025 20:26 UTC

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Last reply on July 24, 2025 08:35 UTC

delvingbitcoin

  • Handling of timestamps is crucial for the integrity of blockchain operations.

  • Proof of Work resolves disputes by identifying the majority's computational effort.

  • Strategies like selfish mining exploit block timing for unfair advantages.

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