Christine D. Kim gives another bi-weekly brief on the important updates in Bitcoin and Ethereum development.

On the Bitcoin side, she covers two new pull requests merged into Bitcoin Core over the past week that will support ongoing benchmarking efforts for the protocol.

On the Ethereum side, she gives an overview of the four proposals being discussed for inclusion in Ethereum’s Hegota upgrade. 

This episode was recorded on February 4, 2026. 

Timestamps: 

(1:25) Bitcoin development updates

(5:18) PR #34207 overview

(6:43) PR #34253 overview

(10:00) Ethereum development updates

(12:46) EIP 8105, Universal Enshrined Encrypted Mempool (EEM)

(14:50) EIP-8141, Frame Transaction

(18:01) EIP-7807, SSZ execution blocks

(20:30) EIP-7805, Fork choice enforced inclusion lists (FOCIL)

(31:50) Next week’s show

Links: 

Bitcoin PR #34207 (https://github.com/bitcoin/bitcoin/pull/34253)

Bitcoin PR #34253 (https://github.com/bitcoin/bitcoin/pull/34207)

Ethereum Magicians Hegota Topic (https://ethereum-magicians.org/tag/hegota)

BTC Before Light Issue #26 (https://christinedkim.substack.com/p/btc-before-light-issue-26)

ACD After Hours ACDE #229 (https://christinedkim.substack.com/p/acde-229)

Titan Builder at 50% marketshare (https://x.com/nero_eth/status/2018989296141701605?s=20)

This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit christinedkim.substack.com/subscribe

Meet Murch, a full-time Bitcoin protocol developer who co-founded his own Bitcoin development company called LocalHost Research.

As part of his day job, Murch is one of six editors who oversee the Bitcoin Improvement Proposal (BIP) process. He recently championed long-overdue changes to the BIP process. 

In my interview with Murch, we discussed his journey as a Bitcoin developer and his most recent work updating the BIP process through BIP-3. 

This interview was recorded on January 16, 2026.

Timestamps:

(2:38) Murch's contributions to Bitcoin

(6:08) Murch's journey as a Bitcoin developer 

(14:18) The vision behind Local Host Research

(17:33) What it takes to become a Bitcoin developer

(21:02) What it takes to become a BIP editor

(25:19) A summary of BIP-3 changes

(30:46) The BIP process vs Bitcoin governance process

(40:02) Ongoing BIP process challenges

(54:03) How BIP-3 was activated

(1:01:10) Rapid-fire questions

Links: 

Murch's X profile (https://x.com/murchandamus)

Bitcoin Optech (https://bitcoinops.org/)

Local Host Research (https://lclhost.org/)

BIP-3 (https://bips.dev/3/)

Blockspace article about BIP-3 (https://x.com/blockspace/status/2011821673184375239)

BTC Before Light issue about BIP-3 (https://christinedkim.substack.com/p/issue-17)

Chaincode BOSS program (https://bosschallenge.xyz/)

BIP-110 (https://bip110.org/)

This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit christinedkim.substack.com/subscribe

In this bi-weekly brief, Christine D. Kim provides updates on the scoping process for the Glamsterdam upgrade. She also highlights updates to the Bitcoin Core and Bitcoin Improvement Proposal (BIP) Github repositories.

Timestamps:

(0:00) Intro

(3:23) Ethereum updates

(15:06) Bitcoin updates

(27:17) Outro

Links:

- Calvin Kim Ready for Merge Interview (https://christinedkim.substack.com/p/podcast-ep-12)

- EIP 8037 (https://eips.ethereum.org/EIPS/eip-8037)

- Glamsterdam EIPs List (https://docs.google.com/spreadsheets/d/1ifXjsiFFzQW8s1gl4Gz3kVDKE2pvTMkPslHuE3U7Nqk/edit?usp=sharing)

- The Charlatan Bio (https://thecharlatan.ch/about/)

Song Credits:

Special thanks to Calios for the music featured in this episode. You can listen to the full track, “Our Lives,” and other songs by Calios on Spotify: https://open.spotify.com/artist/6qs62M8pLHGZuttTwgP6JK.

This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit christinedkim.substack.com/subscribe

Meet Calvin, a Bitcoin protocol developer sponsored by OpenSats, who is working on the Utreexo project.

Utreexo is a hash-based accumulator for the Bitcoin UTXO set. In non-technical terms, it's a way to store and retrieve necessary data about chain state to validate Bitcoin blocks and transactions.

Calvin has been working on Utreexo since 2019.

In this interview, Calvin shares how he came to work on Utreexo full-time and the exciting development milestones he anticipates reaching this year.

This interview was recorded on January 7, 2026.

Timestamps:

(2:45) Utreexo explained in Ethereum terms

(10:26) Utreexo in the Bitcoin governance process

(14:02) How Calvin joined the Utreexo team

(20:29) How the Utreexo project is funded

(25:25) The sustainability of funding for Bitcoin development work

(28:05) What Calvin might do next after Utreexo

(38:01) Utreexo development goals in 2026

(44:22) Rapid-fire questions

Links:

- Utreexo BIPs (https://github.com/utreexo/biptreexo)

- BTC Before Light newsletter on Utreexo (https://christinedkim.substack.com/p/issue-03)

- Floresta (https://github.com/getfloresta/Floresta)

- Summer of Bitcoin (https://www.summerofbitcoin.org/)

- Vinteum (https://x.com/Vinteum_org)

- OpenSats (https://opensats.org/)

This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit christinedkim.substack.com/subscribe

In this bi-weekly brief on Bitcoin and Ethereum protocol development, Christine discusses:

1. The activation of the second Blob Parameter Only (BPO) hard fork on Ethereum

2. Three Bitcoin Improvement Proposals (BIPs) requiring soft fork activation that the Bitcoin community is divided over right now

Timestamps:

(5:05) Ethereum Updates

(22:52) Bitcoin Updates

Links:

Mempirate's analysis on the impacts of Fusaka on Ethereum (https://ethresear.ch/t/block-blob-propagation-with-peerdas/23801)

An explanation of Ethereum's EIP-1559 code change (https://www.galaxy.com/insights/research/ethereum-eip-1559-upgrade-100-days-later)

ACDE #227: Call Minutes + Insights (https://christinedkim.substack.com/p/acde-227)

BTC Before Light newsletter issue on the three Bitcoin code changes requiring soft fork activation that were mentioned in this episode (https://christinedkim.substack.com/p/issue-22)

Song Credits: Special thanks to Calios for the music featured in this episode. You can listen to the full track, “Our Lives,” and other songs by Calios on Spotify: https://open.spotify.com/artist/6qs62M8pLHGZuttTwgP6JK.

This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit christinedkim.substack.com/subscribe

Summary:

In this episode of the Ready for Merge show, Christine D. Kim reviews the most significant code changes in Bitcoin and Ethereum protocol development for the year 2025. She highlights Ethereum's major upgrades, Pectra and Fusaka, which led to substantial Layer-1 and Layer-2 scaling improvements. On the Bitcoin side, the uncapping of the data carrier size sparked controversy within the community. The episode concludes with reflections on the future of both protocols and the challenges they face in 2026.

Timestamps:

06:48 The Most Influential Ethereum Code Merges of 2025

25:45 The Most Influential Bitcoin Code Merges of 2025

Links:

- Nethermind blog post on block gas limit testing improvements in 2025 (https://www.nethermind.io/blog/getting-ethereum-ready-for-gigagas) 

- R4M episode on the controversy of Bitcoin Core v30 (https://www.youtube.com/watch?v=KFg-hU9KXxA) 

- R4M episode on the C-header API (https://www.youtube.com/watch?v=iNLh-flmUdg) 

- R4M episode on the cluster mempool PR (https://www.youtube.com/watch?v=vp8sdOW4Xlk)

- BTC Before Light newsletter post on the nTime overflow problem (https://christinedkim.substack.com/p/issue-21)

This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit christinedkim.substack.com/subscribe

In this guest episode of the Ready for Merge podcast, Christine is joined by EthPandaOps Engineer Barnabas Busa and Prysm Client Developer James He to review the Ethereum Fusaka upgrade from shipping to scoping. Fusaka is the latest hard fork that Ethereum developers have activated on mainnet. It contains several features that will help the protocol scale for more users. Busa and He share their candid thoughts on the main learnings from this upgrade and areas for improvement in the Ethereum protocol development process for the next.

Timestamps:

[1:05] Barnabas and James introductions

[6:57] Was the Fusaka timeline too fast? 

[12:10] The motivation for shipping two forks per year

[21:58] EthPandaOps live custody monitoring tool demo

[30:09] Pending Prysm client optimizations and fixes for Fusaka 

[42:26] Hoodi blob storage calculator demo

[46:16] The expanding role of EthPandaOps in the Ethereum development process

[52:17] Final thoughts on Fusaka

[57:57] Info about next week's R4M show

Links:

- Barnabas' X profile (https://x.com/BarnabasBusa)- James' X profile (https://x.com/jameshe_eth)- EthPandaOps' live blob custody monitoring tool (https://lab.ethpandaops.io/ethereum/data-availability/probes)- Dasmon, live custody monitoring engine for PeerDAS (https://github.com/ethp2p/dasmon)- Hoodi blob storage calculator (https://dora.hoodi.ethpandaops.io/blobs)- Prysm v7.1.0 client release (https://github.com/OffchainLabs/prysm/releases/tag/v7.1.0)

This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit christinedkim.substack.com/subscribe

In this bi-weekly brief on Bitcoin and Ethereum protocol development, Christine discusses two main topics:

1. Bitcoin Core's newly merged Cluster Mempool PR, what it does, and how it benefits Bitcoin miners

2. Ethereum's Fusaka mainnet activation, how to watch it happen, and what to be watching for

Timestamps:

4:09 - Bitcoin Updates

16:54 - Ethereum Updates

41:30 - Show Programming Updates

Links: - Delving Bitcoin Cluster Mempool overview (https://delvingbitcoin.org/t/an-overview-of-the-cluster-mempool-proposal/393)- Christine D. Kim Cluster Mempool Substack post (https://christinedkim.substack.com/p/issue-19) - Fusaka overview and recent client releases (https://christinedkim.substack.com/p/acdt-62)- Ethereum Foundation's Fusaka watch party livestream (https://www.youtube.com/watch?v=upns65rH7mQ)- EthStaker Discord channel (https://discord.com/invite/ethstaker)- Eth R&D Discord channel (https://discord.com/invite/qGpsxSA)- Beacon Chain block explorer (https://beaconcha.in/)- Christine D. Kim subscriber chat (https://christinedkim.substack.com/chat)

Song Credits:Special thanks to Calios for the music featured in this episode. You can listen to the full track, “Our Lives,” and other songs by Calios on Spotify⁠⁠: https://open.spotify.com/artist/6qs62M8pLHGZuttTwgP6JK.

This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit christinedkim.substack.com/subscribe

In this bi-weekly brief on Bitcoin and Ethereum protocol development, Christine discusses four topics:

1. Fusaka mainnet activation on December 3

2. EIP 7918, Blob base fee bounded by execution cost

3. BIP-3, Changes to the Bitcoin Improvement Proposal process

4. Ord V0.2.3 release

Timestamps

2:45 - Ethereum Updates

26:03 - Bitcoin Updates

39:16 - Show Programming Updates

Links

- BTC Before Light issue on Ord V0.2.3 (https://christinedkim.substack.com/p/issue-18)

- BTC Before Light issue on BIP-3 (https://christinedkim.substack.com/p/issue-17)

- ACD After Hours issue on the Glamsterdam FOCIL discussions (https://christinedkim.substack.com/p/acdc-169)

Song Credits

Special thanks to Calios for the music featured in this episode. You can listen to the full track, “Our Lives,” and other songs by Calios on Spotify⁠⁠. See: https://open.spotify.com/artist/6qs62M8pLHGZuttTwgP6JK

This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit christinedkim.substack.com/subscribe

Meet Justin, a Besu developer who works at Consensys.

Justin wasn’t initially a fan of Ethereum. He was first interested in Bitcoin and considered Ethereum a memecoin.

In my interview with Justin, we discussed how he came to work as a full-time client developer for the Besu team and his perspective on the role of client developers within the Ethereum ecosystem.

This interview was recorded on July 16, 2025.

Below are the show notes for the interview, along with the interview transcript.

For more information about the ‘Meet the Devs’ interview series, read this post.

Show Notes

* Justin Florentine

* X: robocopsgonemad

* LinkedIn: Justin Florentine

* GitHub: jflo

* Consensys

* Mission

* Products

* Blog

* Besu

* Official repository

* User documentation

* Good first issues for prospective contributors

This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit christinedkim.substack.com/subscribe