Bitcoin Optech newsletter #395 is here: - describes a standard for verifying VTXOs across different Ark implementations - links to a draft BIP for expanding the miner-usable nonce space in the block header’s nVersion field - points to extensions to standard tooling for TEMPLATEHASH-CSFS-IK support - summarizes updates to the Hourglass V2 proposal - examines perspectives on cryptographic algorithm agility for Bitcoin - Optech Newsletter #395 Podcast https://bitcoinops.org/en/newsletters/2026/03/06/ Jgmcalpine posted to Delving Bitcoin about his proposal for V-PACK, a stateless VTXO verification standard, which aims to provide a mechanism to independently verify and visualize VTXOs in the Ark ecosystem... https://bitcoinops.org/en/newsletters/2026/03/06/#a-stand… Matt Corallo posted to the Bitcoin-Dev mailing list a draft BIP to increase the number of bits available in nVersion’s nonce space for miners from 16 to 24... https://bitcoinops.org/en/newsletters/2026/03/06/#draft-b… Antoine Poinsot wrote on the Bitcoin-Dev mailing list about his preliminary work to integrate the taproot-native OP_TEMPLATEHASH soft fork proposal into miniscript and PSBTs... https://bitcoinops.org/en/newsletters/2026/03/06/#extensi… Mike Casey posted an update to the Bitcoin-Dev mailing list for the Hourglass protocol to mitigate the market impact of quantum attacks against certain lost coins... https://bitcoinops.org/en/newsletters/2026/03/06/#hourgla… Ethan Heilman wrote on the Bitcoin-Dev mailing list regarding the potential need for RFC7696 Cryptographic Algorithm Agility in Bitcoin... https://bitcoinops.org/en/newsletters/2026/03/06/#algorit… Pieter Wuille wrote to the Bitcoin-Dev mailing list about the limitations of the cryptographic agility... https://bitcoinops.org/en/newsletters/2026/03/06/#the-lim… Bitcoin Optech will host an audio recap discussion of this newsletter streaming live on X/Twitter Tuesday at 17:30 UTC.