Bitcoin Optech Newsletter #141, Taproot

The Bitcoin Optech newsletter provides readers with a top-level summary of the most important technical news happening in Bitcoin, along with resources that help them learn more. To help our readers stay up-to-date with Bitcoin, we’re republishing the latest issue of this newsletter below. Remember to subscribe to receive this content straight to your inbox.

This week’s newsletter describes a technique for signature delegation under Bitcoin’s existing consensus rules, summarizes a discussion about taproot’s effect on Bitcoin’s resistance to quantum cryptography, and announces a series of weekly meetings to help activate taproot. Also included are our regular sections describing notable changes to services and client software, new releases and release candidates, and notable changes to popular Bitcoin infrastructure software.


Changes to services and client software

In this monthly feature, we highlight interesting updates to Bitcoin wallets and services.

  • OKCoin launches Lightning deposits and withdrawals: A blog post outlines OKCoin’s Lightning deposit and withdrawal support. They also lowered their minimum deposit/withdrawal limit from 0.001 to 0.000001 BTC as a result. At this time, 0.05 BTC is OKCoin’s limit when transacting using LN.
  • BitMEX announces bech32 support: In a blog post, BitMEX detailed the launch plans for bech32 deposit support. BitMEX had previously rolled out bech32 withdrawal (send) support.
  • Specter v1.2.0 released: Specter v1.2.0 includes support for Bitcoin Core descriptor wallets and coin control features.
  • Breez streams audio for Lightning payments: Breez wallet has integrated an audio player which, combined with keysend, allows users to listen to podcasts while streaming payments to the publisher and sending one-off tip payments.
  • Key manager Dux Reserve announced: Thibaud Maréchal announced Dux Reserve, a beta open source desktop key manager supported on MacOS, Windows, and Linux and supporting Ledger, Coldcard, and Trezor hardware wallets.
  • Coldcard now using libsecp256k1: Coldcard’s version 4.0.0, among other features, switches to using Bitcoin Core’s libsecp256k1 library for its cryptographic operations.

Releases and release candidates

New releases and release candidates for popular Bitcoin infrastructure projects. Please consider upgrading to new releases or helping to test release candidates.

Notable code and documentation changes

Notable changes this week in Bitcoin Core, C-Lightning, Eclair, LND, Rust-Lightning, libsecp256k1, Hardware Wallet Interface (HWI), Rust Bitcoin, BTCPay Server, Bitcoin Improvement Proposals (BIPs), and Lightning BOLTs.

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