Bitcoin Core v30 and libbitcoinkernel with The Charlatan (bitcoin core dev) | SLP696

Oct 24, 2025

In this discussion, The Charlatan, a Bitcoin Core developer and project lead for the Bitcoin Kernel initiative, dives into the highlights of Bitcoin Core version 30. He shares insights on removing the legacy wallet to cut technical debt and the aims of the Bitcoin Kernel project for modular code. They explore the ongoing data carrier size controversy and its balance with network performance, plus enhancements in initial block download times. The conversation also touches on evolving fee policies and the importance of competition among different Bitcoin implementations.

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INSIGHT

Stratum v2 Integration Made Native

Bitcoin Core v30 introduces a new mining IPC interface designed for Stratum v2 integration and live reconfiguration of block templates.
The interface enables miners to run Bitcoin Core alongside dedicated mining software for flexible, real-time mining setups.

ADVICE

Migrate Legacy Wallets Now

Upgrade legacy wallets to descriptor format using provided GUI tools or CLI commands to avoid running unsupported old binaries.
Do not keep running very old Bitcoin Core releases long-term because you miss security and maintenance updates.

INSIGHT

Preparing For The Great Consensus Cleanup

Bitcoin Core is pre-applying some policy changes to mimic parts of the Great Consensus Cleanup to prevent exploits now.
These pre-cleanups protect nodes and help avoid miners generating invalid block templates later.

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In this episode, Stephan Livera discusses the latest developments in Bitcoin Core with The Charlatan, focusing on the significant updates in version 30, including the removal of the legacy wallet, preparations for the Great Consensus Cleanup, and the introduction of the Bitcoin Kernel project.

The conversation also covers the implications of alternative implementations, the ongoing data carrier size controversy, evolving fee rate policies, and improvements in initial block download times. Additionally, they touch on the future of the Bitcoin Core GUI and the importance of competition in the Bitcoin ecosystem.

Takeaways:

🔸Bitcoin Core version 30 introduces significant updates, including a new mining IPC interface.

🔸The legacy wallet is being removed to reduce technical debt and improve code maintenance.

🔸Preparations for the Great Consensus Cleanup are underway to address long-standing bugs.

🔸The Bitcoin Kernel project aims to separate consensus code for better modularity.

🔸Alternative implementations of Bitcoin are encouraged to foster competition and innovation.

🔸The data carrier size controversy highlights the balance between spam prevention and network performance.

🔸Fee rate policies are evolving in response to market dynamics and miner behavior.

🔸Improvements in initial block download times are ongoing, enhancing user experience.

🔸Address indexing features are being considered to improve wallet usability.

🔸The Bitcoin Core GUI is undergoing updates to better serve user needs.

Timestamps:

(00:00) - Intro

(01:30) - Major updates in Bitcoin Core version 30.0

(04:58) - Why is the legacy wallet being removed?

(09:07) - The preparation for the Great Consensus Cleanup

(13:25) - What is the libbitcoinkernel project?

(17:36) - Alternate Bitcoin node implementations

(23:46) - Sponsors

(25:09) - What is the future of competing Bitcoin clients?

(31:56) - Charlatan’s views on controversies surrounding Data carrier size

(37:50) - Is Bitcoin Core serving the interests of few?

(45:45) - What is the impact of Fee Rate Policies?

(53:00) - Dust limits & DOS concerns

(54:45) - What are the enhancements for Lightning Network transactions?

(57:16) - How bad could mining centralization get if left unchecked?; Libre relay and Transaction filtering

(1:03:00) - What are the concerns of illegal content in Bitcoin?

(1:05:45) - What is the most underappreciated aspect of Bitcoin development?

(1:11:10) - Reducing dependencies in Bitcoin Core

(1:14:00) - What are the possible future developments in Bitcoin Core?

(1:22:42) - What will be the role of competition in Bitcoin implementations?

(1:26:00) - Address indexing & Wallet improvements

(1:30:08) - Closing thoughts

Links:

https://x.com/the_charlatan_

Sponsor:

CoinKite.com (code LIVERA)

Stephan Livera links: