Bitcoin Optech newsletter #386 is here:

• summarizes a vault-like scheme using blinded MuSig2
• describes a proposal for Bitcoin clients to announce and negotiate support for new P2P features
• links to 2106 timestamp overflow discussion and considerations around BIP54
• notes a CTV activation meeting and CTV footgun discussion
• summarizes the OP_CHECKCONSOLIDATION proposal
• links to a report of hash-based post-quantum signature schemes
• Optech Newsletter #386 Podcast
  https://bitcoinops.org/en/newsletters/2026/01/02/

Jonathan T. Halseth posted to Delving Bitcoin a prototype of a vault-like scheme using blinded co-signers. Unlike traditional setups using co-signers, this scheme uses a blinded version of MuSig2 to ensure the signers know as little as possible about the funds they are involved in signing...
https://bitcoinops.org/en/newsletters/2026/01/02/#building-a-vault-using-blinded-co-signers

Anthony Towns posted to the Bitcoin-Dev mailing list about a proposal for a new BIP to define a P2P message that would allow peers to announce and negotiate support for new features...
https://bitcoinops.org/en/newsletters/2026/01/02/#peer-feature-negotiation

Asher Haim posted to the Bitcoin-Dev mailing list asking Bitcoin developers to act promptly to prepare for a migration from uint32 to uint64 block timestamps...
https://bitcoinops.org/en/newsletters/2026/01/02/#year-2106-timestamp-overflow-uint64-migration

Josh Doman posted to the Bitcoin-Dev mailing list and Delving Bitcoin asking whether it’s might be worthwhile to modify the consensus cleanup proposal to be more permissive to odd block timestamp behavior to allow a potential soft fork solution to the 2106 block timestamp overflow issue...
https://bitcoinops.org/en/newsletters/2026/01/02/#relax-bip54-timestamp-restriction-for-2106-soft-fork

Chris Stewart posted to Delving Bitcoin a discussion of a “footgun” with OP_CHECKTEMPLATEVERIFY (CTV)...
https://bitcoinops.org/en/newsletters/2026/01/02/#understanding-and-mitigating-a-ctv-footgun

Developer 1440000bytes hosted a CTV (BIP119) activation meeting...
https://bitcoinops.org/en/newsletters/2026/01/02/#ctv-activation-meeting

billymcbip proposed an opcode specifically optimized for consolidations. OP_CHECKCONSOLIDATION (CC) would evaluate to 1 if and only if it’s executed on an input with the same scriptPubKey as an earlier input in the same transaction...
https://bitcoinops.org/en/newsletters/2026/01/02/#op-checkconsolidation-to-enable-cheaper-consolidations

Mikhail Kudinov and Jonas Nick posted to the Bitcoin-Dev mailing list about their work on evaluating hash-based signatures for use in Bitcoin...
https://bitcoinops.org/en/newsletters/2026/01/02/#hash-based-signatures-for-bitcoin-s-post-quantum-future

Bitcoin Optech will host an audio recap discussion of this newsletter on http://Riverside.fm Tuesday at 17:30 UTC. Join us to discuss or ask questions!
https://riverside.com/studio/bitcoin-optech