BIP322, TCP hole punching, ecosystem software - Bitcoin Optech Newsletter #406

Bitcoin Optech newsletter #406 is here:

- links to a discussion of updates to BIP322’s generic signed message format
- describes an idea to use TCP hole punching to help Bitcoin nodes behind NATs accept inbound connections
- summarizes changes to services/client software
- Optech Newsletter #406 Podcast
https://bitcoinops.org/en/newsletters/2026/05/22/

Oliver Gugger posted to the Bitcoin-Dev mailing list about his ideas on how to round out BIP322...
https://bitcoinops.org/en/newsletters/2026/05/22/#significant-updates-to-bip322-generic-signed-message-format

0xB10C posted to Delving Bitcoin about an idea to make more nodes behind a home router NAT accept inbound connections...
https://bitcoinops.org/en/newsletters/2026/05/22/#tcp-hole-punching-for-bitcoin-nodes-behind-nats

Changes to services and client software:

- Ibis Wallet announced
- LDK Server announced
- Mempool.space v3.3.0 released
- peer-observer P2P monitoring tooling
https://bitcoinops.org/en/newsletters/2026/05/22/#changes-to-services-and-client-software

Bitcoin Optech will host an audio recap discussion of this newsletter streaming live on X/Twitter Tuesday at 16:30 UTC.