Announcements

Until our community can meet again in person, we’ll continue to share all the latest research and development on Bitcoin, Lightning and related technologies through our monthly newsletter.

Mailing Lists and Bitcoin Optech

Mailing Lists

bitcoin-dev

• Bitcoin Core 0.20.1 released
• Detailed protocol design for routed multi-transaction CoinSwap
• On the compatibility of Bech32 and Shamir’s Secret Sharing
• Revisiting squaredness tiebreaker for R point in BIP340
• Generalizing feature negotiation when new p2p connections are setup
• Default Signet, Custom Signets and Resetting Testnet

Optech

• Newsletter #109
• Newsletter #110
• Newsletter #111
• Newsletter #112

Network Data

• “Dusting” of Bitcoin UTXO
• Stale blocks - 1 2
• Coinbase: Reflections on Bitcoin transaction batching
• Increase in BTC stored in OP_RETURN outputs
• Analysis of cryptocurrency transaction volume out of East Asia
• Effects of flooding in China on hashrate video
• DeFi and ETH fees

CVEs and Research

Research

• Bitcoin Covenants: Three Ways to Control the Future
• MAD-HTLC – Because HTLC is Crazy-Cheap to Attack
• Generalized Bitcoin-Compatible Channels
• Discouraging Pool Block Withholding Attacks in Bitcoins
• The Bisq DAO: On the Privacy Cost of Participation
• Cross-Layer Deanonymization Methods in the Lightning Protocol
• Counting Down Thunder: Timing Attacks on Privacy in Payment Channel Networks
• Generalized Bitcoin-Compatible Channels
• Bitcoin-Compatible Virtual Channels

InfoSec

• >23% of the Tor network’s exit capacity has been attacking Tor users
• Web Cache Entanglement: Novel Pathways to Poisoning
• Bugs found in Binance’s tss-lib
• Ledger App isolation bypass
• Ethereum mempool bots
• Ethereum Classic 51% attack
• ETH2 Medalla testnet outage
• Opyn ETH put exploit

Pull Requests and repo updates

Bitcoin Core

• Transactions propagation design goals
• wallet: always do avoid partial spends if fees are within a specified range
• Add loadwallet and createwallet load_on_startup options
• rpc: separate bumpfee’s psbt creation function into psbtbumpfee
• Cache responses to GETADDR to prevent topology leaks
• p2p: Signal support for compact block filters with NODE_COMPACT_FILTERS
• Enable fetching of orphan parents from wtxid peers
• Add txids with non-standard inputs to reject filter
• Allow RPC to fetch all addrman records and add records to addrman
• -maxapsfee follow-up

BIPs

• bip-325: change signature scheme to be tx-based
• BIP174: Clarify that both UTXO types are allowed
• BIP174: add hash preimage fields to inputs

BOLTs

• Anchor outputs
• More conservative cltv_expiry_delta recommendations

eclair

• Eclair v0.4.1
• PostgreSQL Support
• Activate anchor output in channels
• Add API commands to sign & verify arbitrary messages

c-lightning

• C-Lightning v0.9.0: Rat Poison Squared on Steroids
• c-lightning’s summary plugin now shows you how available your peers are
• fundpsbt/utxopsbt: let caller specify locktime, signpsbt: signing restrictions
• pay: Add timestamp of first part to listpays
• Anchor output support (iff EXPERIMENTAL_FEATURES)

lnd

• lnd v0.11.0-beta
• multi: I wumbo, you wumbo, he she wumbo
• multi: enforce conservative minimum for user-chosen CLTV deltas
• multi: add labels to lnd native transactions
• Intercept forward htlc
• lnrpc/invoicesrpc: extend hop hint selection to account for MPP
• tls: add –tlsdisableautofill flag to prevent sensitive data leaks
• add modified greedy topK centrality heuristic to autopilot

joinmarket

• 0.7.0 Release
• bech32 compatability for joinmarket

wasabi

• v1.1.12 Released
• Bug bounty program
• Wasabi-comptabile iOS app

Events and Podcasts

• Block Digest - Chris Belcher
• Stephen Livera - Christian Decker
• Confidential Asset-Based Loans on Liquid Network
• Bitcoin Sydney - Socratic Seminar July
• Bitcoin Sydney - Socratic Seminar August
• London BitDevs - Socratic Seminar on Signet
• Chicago BitDevs - Socratic Seminar 11

Miscellaneous

• This Month in Bitcoin Privacy newsletter - June July August
• Whirlpool + Posmix Spending FAQ
• 2-of-3 inputs using Pay-to-Taproot
• Rust c-lightning client
• Research of patterns in the nonce selection of early blocks
• Antminer S19 Pro vs Whatsminer M30S+ - Part 1 Part 2
• Liquid.Coach developer tool
• Lightning Terminal
• OKCoin Grant - Marco Falke
• Square Crypto Grant for Lloyd Fournier
• Human Rights Foundation Developer Grants
• Bitmain shipping delays
• BlueWallet Desktop
• Ride-The-Lightning Release v0.9.0
• Pool Detective
• Bitcoin Core GUI introductory meeting