Bitcoin Optech newsletter #408 is here:

- summarizes ideas to make BIP324 transport encryption quantum secure
- describes a proposal to standardize QR-based signing payloads for miniscript wallets
- links to a CTV-only vault proof of concept
- outlines points from a post-quantum Lightning thread
- summarizes a quantum attack game theory post
- points to discussion of 64-byte transactions and potential uses
- Optech Newsletter #408 Podcast
https://bitcoinops.org/en/newsletters/2026/06/05/

Olaoluwa Osuntokun posted to the Bitcoin-Dev mailing list his thoughts on possible upgrades needed to make BIP324 quantum secure...
https://bitcoinops.org/en/newsletters/2026/06/05/#a-post-quantum-path-for-bip324

Pyth posted to Delving Bitcoin a proposal to standardize the data payloads exchanged between wallet coordinators and air-gapped signing devices over QR codes when using miniscript-based spending policies...
https://bitcoinops.org/en/newsletters/2026/06/05/#discussion-of-qr-signing-payloads-for-miniscript-wallets

Ademan announced on Delving Bitcoin the 0.1.0 release of his CTV (BIP119) vault project called MCCV (More Complicated CTV Vault)...
https://bitcoinops.org/en/newsletters/2026/06/05/#ctv-only-vault-proof-of-concept

Olaoluwa Osuntokun (roasbeef) posted to Delving Bitcoin a breakdown of how a post-quantum Lightning Network might look...
https://bitcoinops.org/en/newsletters/2026/06/05/#post-quantum-lightning-discussion

Jameson Lopp posted to Delving Bitcoin his blog post about the game theory of a quantum attack...
https://bitcoinops.org/en/newsletters/2026/06/05/#quantum-attack-game-theory

Jeremy Rubin wrote to the Bitcoin-Dev mailing list about potential legitimate uses for 64-byte witness-stripped transactions...
https://bitcoinops.org/en/newsletters/2026/06/05/#bip54-64-byte-transactions-and-potential-legitimate-uses

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