Special thanks to Chaincode Labs and NYU Blockchain Digital Asset Forum for food, refreshments and event space.

Presentation

• 0xB10C - Mempool Observer

ML and Bitcoin Optech

• Bech32 Sending Support
• Newsletter 46
• Newsletter 47
• Newsletter 48
• Newsletter 49
• Newsletter 50

Network Data

• Mempool Space
• 0.18.x adoption
• P2SH outputs store 34% of all BTC
• New ATH in addresses holding at least .1 BTC
• Largest equal-sized output coinjoin

CVEs and Research

Research

• Utreexo: A dynamic hash-based accumulator optimized for the Bitcoin UTXO set
• A2L: Anonymous Atomic Locks for Scalability and Interoperability in Payment Channel Hubs
• Atomic Multi-Channel Updates with Constant Collateral in Bitcoin-Compatible Payment-Channel Networks
• Bandwidth-Efficient Transaction Relay for Bitcoin discussion
• Lattice RingCT v2.0 with Multiple Input and Output Wallets
• SoK: A Taxonomy for Layer-2 Scalability Related Protocols for Cryptocurrencies
• Spartan: Efficient and general-purpose zkSNARKs without trusted setup
• Statechains: Non-custodial Off-chain Bitcoin Transfer
• A Deep Dive into Bitcoin Mining Pools: An Empirical Analysis of Mining Shares
• Lot49A lightweight protocol to incentivize mobile peer-to-peercommunication
• A Closer Look at Submarine Swaps in the Lightning Network
• Invoiceless Lightning Payments with Circular Route
• On the Difficulty of Hiding the Balanceof Lightning Network Channels
• Timed Signatures and Zero-Knowledge Proofs–Timestamping in the Blockchain Era–
• Homomorphic Time-Lock Puzzlesand Applications

InfoSec

• RAMBLEED
• iPhone Use-after-free in IMAP NAMESPACE processing - project-zero
• Key generation vulnerability found on WalletGenerator.net
• The Most Expensive Lesson of My Life: Details of SIM port hack
• MakerDAO Critical Vulnerability Notice
• The Bitcoin Cash Hardfork – Three Interrelated Incidents -Inside Monero’s ‘Last Ditch Effort’ to Block Crypto Mining ASICs

Pull Requests

Bitcoin Core review club

Bitcoin Core

• #15930: Add getbalances RPC
• #15939: Remove build target for win32
• #14802: Speed up getblockstats RPC
• Version 2 P2P:
  • #14047: Add HKDF_HMAC256_L32 and method to negate a private key
  • #15512: Add ChaCha20 encryption option (XOR)
  • #15649: Add ChaCha20Poly1305@Bitcoin AEAD
  • Jonas Schnelli’s presentation at Breaking Bitcoin

lnd

• #3098: fundingmanager: bump max non-initiator funding timeout to 2 weeks
• #2985: Broadcast gossip announcements in sub batches
• #2802: routing: probability based path finding. See Joost’s presentation at Breaking Bitcoin
• #3140: sweep+rpc: add support to bump fee of inputs/transactions
• #2455: [WIP] multi: add new draft key send mode for spontaneous payments
• #2926: routing: tracking visited nodes in findPath

c-lightning

• #2650: Channel fund hook
• #2644: Final gossip store optimization

eclair

• #965: API: optionally use a user supplied preimage when creating invoices

Breaking Bitcoin talks

• Chris Belcher - Breaking Bitcoin Privacy: video, transacript
• Carl Dong - Bitcoin Build System Security: video, transacript
• Jonas Nick - Secure Protocols on bip-taproot video, transcript
• Charles Guillemet - Extracting Seeds from Hardware Wallets: video, transcript
• Omer Shlomovits - Cryptographic Vulnerabilities in Threshold Wallets: video

The month in Lapps

• watchtower example demo
• loop
• Joule allowances

Events

• Breaking Bitcoin 2019 Transcripts
• Breaking Bitcoin 2019 Stream
• Bitcoin Core Dev Tech 2019 Transcripts
• LND 0.6 Beta Deep-Dive
• Estimating the capacity of the ant routing algorithm for the Bitcoin lightning network