Location

The event will be hosted at Waitabit Coffee Collective:

Map

Announcements

Join us on our Bitcoin Socratic Seminar #27. 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

---

MC: Brandon

• Bitcoin Core 31.0rc4 — fourth release candidate; community testing window open
• BIP 361: Post-Quantum Migration and Legacy Signature Sunset — proposes sunsetting ECDSA/Schnorr key-path spending in a future soft fork; builds on BIP 360 P2MR
  • BIP 360 P2QRH: ongoing protocol design discussion
  • BIP Draft: Witness Version 3 — ML-DSA-65 Post-Quantum Key-Path Spending — alternative PQ address type using NIST ML-DSA-65
  • SHRIMPS: 2.5 KB post-quantum signatures across multiple stateful devices
• Commit-Reveal for PQ Migration — Jeremy Rubin proposes soft-fork-free PQ protection via pre-committed hashes
• Active Sweeping of Vulnerable Outputs after Q-day — how exposed pubkey coins could be handled when quantum threat materialises
• Utreexod 0.5 — SwiftSync for IBD with dramatically reduced UTXO download requirements
  • Floresta 0.9.0 — BIP183 alignment and Bitcoin Kernel integration for a utreexo-based node
• Binary Fuse Filters as an alternative to BIP 158 GCS — more space-efficient compact block filter encoding
• Eltoo State Chain on Signet: CSFS+CTV with rekey and ladder, no CAT — working two-transaction settlement demo on signet
• How CTV+CSFS improves BitVM bridges — Robin Linus shows covenant opcodes eliminate trusted operators in BitVM bridge design
• Formal Verification of secp256k1 Modular Scalar Multiplication — machine-checked proof of correctness for secp256k1 scalar operations
• Coldcard 6.5.0 — adds MuSig2, BIP322, miniscript, and taproot key-path features

Mining

---

MC: Simon

• Difficulty slides 2.43% to 135.59T on April 17 — hashprice up 13.65%; faster blocks point to upward adjustment by April 30
• Challenge: Covenants for Braidpool — Bob McElrath on which covenant proposal best enables decentralised share accounting for mining pools

Lightning Network

---

MC: Isaack

• Towards a K-of-N Lightning Network Node — ZmnSCPxj proposes nested MuSig2 to split a single LN node’s keys across multiple machines
  • Paper: Nested MuSig2 for threshold Lightning signing
• Core Lightning 26.04rc3 — April 2026 release candidate
  • CLN #9021: Splicing enabled by default
  • CLN #9046: Keysend CLTV expiry raised to 42 blocks
• LND #9985: Simple taproot channels in production — taproot channel support graduates from experimental flag
• LDK #4515: Zero-fee anchor commitments to production
• Onion Message Jamming in the Lightning Network — DoS vectors via onion messages and proposed mitigations
• Eclair #3269: Automatic idle channel liquidity reclamation

Ecash

---

MC: Okjodom

• Compact Isogeny PQC: post-quantum replacement for HD wallet key-tweaking and silent payment scanning — has direct implications for how Cashu mints and Fedimint federations derive keys
• Cashu ecosystem — CDK, nutshell, eNuts, cashu-ts, cdk-go — multiple projects pushed updates mid-April 2026; check individual release pages for details
• Frigate 1.4.0 — Nostr client adds silent payment address scanning with GPU acceleration
• Stealth Addresses Using Nostr — proposal to use Nostr relays as the notification layer for silent payment coordination

Upcoming Events & Announcements

---

MC: Sharon

• Btrust Builders Pathways
• bitcoin++ open source edition
• Adopting Bitcoin Nairobi
• Africa Bitcoin Conference 2026

---

Submit suggestions for next meeting!

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