Location

The event will be hosted at NodeNBO:

Gigiri, Nairobi

nodenbo.com

Map

Announcements

Join us on our Bitcoin Socratic Seminar #28. A special thank you to our sponsor Btrust for food and refreshments.

Reminders

• We prefer no photos and no videos during the event
• Chatham House Rule
• Leave the meeting space as clean as you found it
• Suggest topics for the next Socratic Seminar! Where to find topics?

Topics

Bitcoin

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MC: Brandon

• TCP hole punching for Bitcoin nodes behind home NATs
• CVE-2024-52911: Bitcoin Core script interpreter remote crash disclosure — use-after-free bug in parallel script validation; affects v0.14.0–28.x, fixed in 29.0
  • CVE-2024-52911 - Script Interpreter Remote Crash
  • Bitcoin Core #35209 — the covert + formal fix
• Fingerprinting nodes: Possible Solutions
• BIP Proposal: UTXO Set Sharing over P2P Network — extends assumeUTXO with a new service bit and 4 P2P messages
  • BIP draft: UTXO set sharing
• BIP-323 merged: 24-bit nVersion nonce space for miners — supersedes BIP-320; reserves bits 5–28 for header-only mining without rolling nTime more than once per second

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MC: Frank

• BIP-376: Spending Silent Payment outputs with PSBTs — how to include SP outputs in a PSBT workflow without leaking the shared secret
• Frigate 1.4.0: GPU-accelerated Silent Payments scanning — experimental Electrum server for SP; uses UltrafastSecp256k1 + GPU; months of blocks scanned in ~0.5s

Mining

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MC: Simon

• Stratum V2 Working Group: Foundry, AntPool, F2Pool, SpiderPool, Block Inc., MARA, DMND join — 7 pools representing ~75% of global hashrate; announced May 7, 2026
  • Key feature: miner-selected block templates — implications for censorship resistance
  • Stratum V2 Working Group

Lightning Network

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MC: Isaack

• Core Lightning 26.04 released — splicing enabled by default; new splicein/spliceout commands including cross-splice mode; removes legacy onion format support; parallel pathfinding improvements in askrene
• Core Lightning 26.06rc1 — new graceful, sendamount, xkeysend RPCs; begins pay deprecation in favour of xpay; adds BOLT12 payer-proof RPC support
• LND v0.21.0-beta.rc1: payment store migration to native SQL — nodes using --db.use-native-sql with SQLite/Postgres will have payment store migrated from KV to SQL; opt-out available
• Nested MuSig2 Lightning Nodes — ZmnSCPxj on k-of-n multisig Lightning nodes via nested MuSig2; motivated by large holders wanting safety guarantees without a single key

Ecash

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MC: Jodom

• Cashu CDK — Go and Rust implementations — cdk-go, eNuts, Numo (Lightning PoS), cashu.me, and orchard (mint management UI) all updated May 2026
• Stateless VTXO Verification: Decoupling Custody from Implementation-Specific Stacks — Ark-related standard for verifying VTXOs across different implementations; also covered in Optech #393

Upcoming Events & Announcements

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MC: Sharon

• Bitcoin Nairobi Conference
• bitcoin++ Open Source Edition
• Africa Bitcoin Conference 2026

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Submit suggestions for next meeting!

Issues on Github: https://github.com/BitDevsNBO/bitdevsnbo.org/issues