Bitcoin Optech newsletter #347 is here: - describes upfront and hold fees in LN based on burnable outputs - summarizes discussion about testnets 3 and 4 - announces a plan to relay certain transactions containing taproot annexes - summarizes popular Q&A from Stack Exchange - Bitcoin Core 29.0rc2 - Optech Newsletter #347 Recap bitcoinops.org/en/newsletters/2025/03/28 John Law posted to Delving Bitcoin the summary of a paper he’s written about a protocol nodes can use to charge two additional types of fees for forwarding payments... bitcoinops.org/en/newsletters/2025/03/28/#ln-upfront-and-hold-fees-using-burnable-outputs Sjors Provoost posted to the Bitcoin-Dev mailing list to ask whether anyone was still using testnet3 now that testnet4 has been available for about six months... bitcoinops.org/en/newsletters/2025/03/28/#discussion-of-testnets-3-and-4 Peter Todd announced to the Bitcoin-Dev mailing list his plan to update his Bitcoin Core-based node, Libre Relay, to begin relaying transactions containing taproot annexes if they follow particular rules... bitcoinops.org/en/newsletters/2025/03/28/#plan-to-relay-certain-taproot-annexes Selected Q&A from Bitcoin Stack Exchange: - Why is the witness commitment optional? - Can all consensus valid 64 byte transactions be (third party) malleated to change their size? - How long does it take for a transaction to propagate through the network? - Utility of longterm fee estimation - Why are two anchor outputs are used in the LN? - Why are there no BIPs in the 2xx range? - Why doesn’t Bech32 use the character “b”? - Bech32 error detection and correction reference implementation - How to safely spend/burn dust? - How is the refund transaction in Asymmetric Revocable Commitments constructed? - Which applications use ZMQ with Bitcoin Core? bitcoinops.org/en/newsletters/2025/03/28/#selected-qa-from-bitcoin-stack-exchange Bitcoin Core 29.0rc2 is a release candidate for the next major version of the network’s predominate full node. Please see the version 29 testing guide. github.com/bitcoin-core/bitcoin-devwiki/wiki/29.0-Release-Candidate-Testing-Guide Bitcoin Optech will host an audio recap discussion of this newsletter on Riverside.fm Tuesday at 15:30 UTC. Join us to discuss or ask questions! riverside.fm/studio/bitcoin-optech