• 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

• BitDevs around the world
• LDK moving away from GitHub
  • New Forgejo instance
  • Announcement

Bitcoin (Core, protocol, wallets)

• OP_RETURN usage before and after Bitcoin Core v30
• BIP-110 aftermath
  • The minority-chain fork
  • BIP 110 status changed to Closed
  • Discussion to mark BIP 110 as Closed
  • Proposal to adopt a new proof-of-work algorithm
  • Motion to remove Luke Dashjr from the BIP editors
  • Replay protection and safe coin splitting
• Can parts of Bitcoin consensus be formally verified?

Privacy / Cryptography / Research / Security

• Coldcard seed-generation entropy failure
  • Disclosure and technical discussion
  • Bug summary
  • Official security status
• Wasabi Wallet command injection and the “backdoor” allegation
  • Summary
• Boltz take over
• Bitcoin Red Team
• BTCPay Server LND macaroon exfiltration
  • Security advisory
  • Announcement
• Twin memory-exhaustion DoS vulnerabilities in Core Lightning

Lightning and L2 - Bonus

• LDK async payments: receiving while offline
• Agent-to-agent payments
• Ark unilateral exits from Noah wallet
• 0-conf for Elements and Liquid: a technical explainer
• The Deadly Race: a formal threat model for wrench attacks

• 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

• RadarChat
  • EU Chat Control
• Bitcoin Learning Graph
• BIP-110 madness
  • Fork Countdown
  • Description and counter arguments
  • Anti Bitcoin Core Report

Bitcoin (Core, protocol, wallets)

• CTV-only Vault Concept v0.1.0 release
• Fountain Codes: a way to reduce blockchain storage costs

Lightning and L2

• Spark developments
  • Blink adoption
  • Pending unilateral exit
  • Unilateral exit case study
  • Spark Opacity
• 2 vulnerabilities in Bark to steal funds
• LND: Zero-Timestamp Gossip DoS disclosure
• Vulnerability Disclosure: Assertion DoS in Core Lightning

Privacy / Cryptography / Research / Security

• Intersection Attacks on CoinJoin Anonymity

• 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

• Welcoming conduition
• Public Pool added Stratum V2 support
• Zenobank: Crypto Payment Gateway Architecture

Bitcoin (Core, protocol, wallets)

• Bitcoin Core 31.0 release notes
• Private Broadcast may reveal sender IP address in Bitcoin Core 31.0
• Security analysis of Bitcoin’s V2 transport protocol

Lightning and L2

• Bark now on Bitcoin mainnet
  • Bark changelog
  • Noah Wallet
• Ark: Offchain Transaction Batching in Bitcoin
• Cube: Ark + ZK
  • Cube gist

Privacy / Cryptography / Research / Security

• Zcash Orchard bug: possible undetectable inflation
• Trezor TROPIC01 chip vulnerability disclosure
• Bitcoin Optech #408: making BIP324 quantum secure

• 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

• Btrust announces new board
• Influence of Bitcoin developers
• Wallet passphrase recovery using Claude + btcrecover
• Galtland Index

Bitcoin (Core, protocol, wallets)

• BIP450: Formosa, seed encoding by themed mnemonic stories Implementation
• TCP hole punching for Bitcoin nodes behind NATs

Lightning and L2

• Introducing Mosaic: Glock’s final piece
  • BitVM3
• Dog Park: Privacy in Bark

Privacy / Cryptography / Research / Security

• QCAP: A Bitcoin-Native Quantum Canary Alert (paper)
• Bisq Protocol Exploit, 11 BTC stolen
• CVE-2024-52911: Script Interpreter Remote Crash

• Respect the privacy of participants
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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

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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

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• 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