• Respect the privacy of participants
• Meetups are never recorded. We want everyone to feel comfortable participating and discussing the scheduled topics, anonymously if they wish
• Join our Signal Group

Acknowledgements

• Thanks to Vinteum and Bitcoin Paraguay for the support

Warmup

• Vulnerability Report — BRIX
  • BRIX code

Bitcoin (Core, protocol, wallets)

• In defense of a PQ output type
  • Post-Quantum BIP-86 Recovery via zk-STARK Proof of BIP-32 Seed Knowledge
  • BIP 361 - Quantum Migration and freeze of old coins
• Bitcoin Under Stress: Measuring Infrastructure Resilience 2014-2025
• Block propagation and validation duration during slow-to-validate blocks on Signet
  • BIP54 / Consensus Cleanup

Lightning and L2

• LND adds onion message forwarding on the road to BOLT12 offers
• Core Lightning fixes splice interoperability issues with Eclair

Privacy / Cryptography / Research

• How wallet fingerprints damage payjoin privacy

• Respect the privacy of participants
• Meetups are never recorded. We want everyone to feel comfortable participating and discussing the scheduled topics, anonymously if they wish
• Join our Signal Group

Acknowledgements

• Thanks to Vinteum and Bitcoin Paraguay for the support

Warmup

• Review BTC++
• Bitcoin Mining Hashrate Increases +50% to 1.2 ZH/s
• Open-Source Agents Need to Get Serious About Payments

Bitcoin (Core, protocol, wallets)

• The limitations of cryptographic agility in Bitcoin
  • Quantum-Proofing Bitcoin with P2Q Addresses
• Recent OP_RETURN usage and BIP-110
  • Embedding Images in Bitcoin Blocks Without OP_RETURN via Slipstream
• Using AI tooling for code review

Lightning and L2

• SuperScalar (channel factories / Decker-Wattenhofer timeout tree)
• Mario Kart with LN

Privacy / Cryptography / Research

• I2P network under attack
  • Kimwolf botnet swamps anonymity network I2P
  • US says it disrupted Kimwolf botnet

• Respect the privacy of participants
• Meetups are never recorded. We want everyone to feel comfortable participating and discussing the scheduled topics, anonymously if they wish

Acknowledgements

• Thanks to Vinteum and Bitcoin Paraguay for the support

Warmup

• Boomerang: Bitcoin Cold Storage with Built-In Coercion Resistance
• Epstein created Bitcoin?

Bitcoin (Core, protocol, wallets)

• Drivechain enabled Bluewallet
• BIP 360 merged: Pay-to-Merkle-Root (P2MR) for quantum-resistant outputs

Lightning and L2

• Voltage Credit
• Lightning Labs L402 protocol toolset release for AI agents on Lightning

Privacy / Cryptography / Research

• Market Power and Bitcoin Protocol: How miners are increasing average fees
• Argo: a garbled-circuits scheme for 1000x more efficient off-chain computation
• OP_CAT and Bitcoin’s Path to Quantum Resistance

• Respect the privacy of participants
• Meetups are never recorded. We want everyone to feel comfortable participating and discussing the scheduled topics, anonymously if they wish

Acknowledgements

• Thanks to Vinteum and Bitcoin Paraguay for the support

Warmup

• G‑Bot Federation Setup Service
• Floresta Project
• WOTSearch - Trust-Weighted Search & Discovery for Nostr

Bitcoin (Core, protocol, wallets)

• Bitcoin 30.2

L2

• ARK as a channel factory: compressed liquidity management for improved payment feasibility

Privacy / Cryptography / Research

• Building a vault using blinded co-signers
• Hash Based Signatures for Bitcoin
• Jade Security Disclosure

• Respect the privacy of participants
• Meetups are never recorded. We want everyone to feel comfortable participating and discussing the scheduled topics, anonymously if they wish

Acknowledgements

• Thanks to Vinteum and Bitcoin Paraguay for the support

Warmup

• Cluster Mempool Implementation PR Merged 🚀
• Enabling Lightning Payments with Liquid Swaps in the Blockstream App

Bitcoin (Core, protocol, wallets)

• BIP 89: Chain Code Delegation for Private Collaborative Custody #2004
  • How Bitkey used Chain Code Delegation to create the first private collaborative bitcoin wallet.
  • Chain Code Delegation: Improving privacy in collaborative multisig
• Consensus bug on NBitcoin: out-of-bound issue in Remove()

L2

• Gossip Observer: New project to monitor the Lightning P2P network

Privacy / Cryptography / Research

• Privacy-first watch-only Bitcoin wallet
  • UtxoPocket UI
• What Trezor’s new “quantum-ready” hardware wallet really means for Bitcoin

• Respect the privacy of participants
• Meetups are never recorded. We want everyone to feel comfortable participating and discussing the scheduled topics, anonymously if they wish

Acknowledgements

• Thanks to Vinteum and Bitcoin Paraguay for the support

Warmup

• BTCPay Server new monetization framework
  • How to get robbed in 4BTC (2023)
• PenLock v1.0: Paper-Based Secret Splitting for BIP39 Seed Phrases
  • Website: Penlock v1.0

Bitcoin (Core, protocol, wallets)

• BIP draft: Reduced Data Temporary Softfork
• Calle of cashu argues why transaction fees are the only viable method to prevent spam in bitcoin
• Remove BCashJr’s DNS seed from Bitcoin Core

L2

• ArcadeOS: An operating system for programmable money
• How well does Ark scale bitcoin payments?

Privacy / Cryptography / Research

• “TEEs are bad”
  • What is TEEs
  • Putting trillions on TEEs is very irresponsible
• The State of DIY Bitcoin Hardware Wallets
• An Independent Security Audit of Bitcoin Core

Philosophy

• Bitcoin Embracing MimbleWimble

Releases

• Phoenix Wallet has Taproot channels support

• Respect the privacy of participants
• Meetups are never recorded. We want everyone to feel comfortable participating and discussing the scheduled topics, anonymously if they wish

Acknowledgements

• Thanks to Vinteum and Bitcoin Paraguay for the support

Warmup

• How “filters” started?
• A note on hostility against Bitcoin Core devs
• Zero zero zero transaction

Bitcoin (Core, protocol, wallets)

• What is in Bitcoin Core v30?
  • Notable: Improve TxOrphanage denial of service bounds
• Are all taproot addresses vulnerable to quantum computing
• Draft BIPs for Script Restoration

L2

• Spark/WoS lack of privacy
  • Example: elderdeborah028@walletofsatoshi.com
• Eclair vulnerability that allows an attacker to steal all current funds from a channel

Privacy / Cryptography / Research

• Secure Fountain Codes for Pruned Bitcoin Nodes
  • Fountain code

Releases

• Sparrow wallet 2.3.0 has silent payments support

• Respect the privacy of participants
• Meetups are never recorded. We want everyone to feel comfortable participating and discussing the scheduled topics, anonymously if they wish

Acknowledgements

• Thanks to Vinteum and Bitcoin Paraguay for the support

Warmup

• Conferences
  • Accelerating Bitcoin
  • SatsConf
    • BITDEVS10
• Bitcoin++ Insider
• BIS AML proposal for cryptoassets

Bitcoin (Core, protocol, wallets)

• State of bitcoinfuzz

L2

• Tether to launch USDT on RGB
  • RGB vs Taproot Assets vs Spark vs Liquid
  • RGB vs Taproot Assets vs Spark vs Liquid vs Rootstock vs Citrea

Privacy / Cryptography / Research

• Eclipsing Bitcoin nodes with BGP interception attacks
  • Bitcoin Nodes ASNs
• Ark usage in Riga
• Frost Example
• Waterfalls

• Respect the privacy of participants
• Meetups are never recorded. We want everyone to feel comfortable participating and discussing the scheduled topics, anonymously if they wish

Acknowledgements

• Thanks to Vinteum and Bitcoin Paraguay for the support

Warmup

• Is recycling coins a thing? (bitcoin-dev)
• Running Bitcoin: client comparison (PDF)
• Cat images vs Filters
  • One liner: curl -s "https://mempool.space/api/tx/8a3c63c2e9ff88db03b58dba600e2cb78c77c921928034a709f903b080eeb34f" | jq -r '.vin[0].witness[2]' | tr -d '[:space:]' | grep -o -i -m1 '52494646[0-9a-f]*57454250[0-9a-f]*' | cut -c1-8192 | xxd -r -p > labitbu.webp
  • Labitbu
• Eggstr

Bitcoin (Core, protocol, wallets)

• Changing the minimum relay feerate
  • Delving thread
  • PR
• Utreexo — draft BIPs and request for review
  • Accumulator BIP
  • P2P BIP
  • Validation BIP
• Peer block template sharing — mitigate divergent mempool policies: Delving thread · Optech #366
  • BIP PR
• Chain Code Delegation — collaborative custody without xpub disclosure: Delving post
• Augur — mempool‑based fee estimation lib by Block: Delving post · Optech #365

L2 / Lightning

• BOLT12 in the wild — Alby Hub v1.18 adds offers; Umbrel app: Alby release note · Umbrel app
• Glock — Alpen Labs’ proposal for fast verification using garbled circuits + DV‑SNARKs: Blog
  • Paper

Privacy / Cryptography / Research

• FROSTSnap — ergonomic threshold signing stack: frostsnap.com
• LND gossip DoS vuln (historic) — fixed in 0.18.3; recap for operators: Optech #364

• Respect the privacy of participants
• Meetups are never recorded. We want everyone to feel comfortable participating and discussing the scheduled topics, anonymously if they wish

Acknowledgements

• Thanks to Vinteum and Bitcoin Paraguay for the support

Warmup

• LN native prediction market
• Mesh networks
  • Bluetooth
  • LoRa

Bitcoin

• <1 sat/vB mempool
• Bitcoin Snapshots - signed and pre-synced UTXO Set torrent
• Quantum proposals
  • jlopp’s Post Quantum Migration
  • Changes to BIP 360 - Pay to Quantum-Resistant Hash (P2QRH)

Mining

• Stratum v2 STARK proof demo
• How Stratum V2 Increases Mining Profitability

Privacy / Cryptography

• Zerolink CoinJoin coordinator
  • Security Analysis
  • Response
• wskdf
• White Noise is out!

L2

• Wallet of Satoshi - Self Custodial mode (?)
  • Spark TL;DR
  • Statechains
  • Statechains Deep-Dive
• Garbled circuits and BitVM3
  • BitVM3
  • Good Podcast
  • Potential Attack