Newsletters: add 386 (2026-01-02)

_posts/en/newsletters/2026-01-02-newsletter.md

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+---
+title: "Bitcoin Optech Newsletter #386"
+permalink: /en/newsletters/2026/01/02/
+name: 2026-01-02-newsletter
+slug: 2026-01-02-newsletter
+type: newsletter
+layout: newsletter
+lang: en
+---
+
+FIXME:bitschmidty
+
+## News
+
+- **Building a vault using blinded co-signers:** Jonathan T. Halseth [posted][halseth post] to
+  Delving Bitcoin a prototype of a [vault][topic vaults] like scheme using Blinded co-signers.
+  Unlike traditional setups using co-signers this setup uses a blinded version
+  of [MuSig][topic musig] to ensure the signers know as little as possible about the funds they
+  are involved signing.
+
+  In order for the signers to not blindly sign what is given to them this scheme
+  attaches a ZK (zero knowledge) proof to the signing request.
+
+  Halseth provided a graph of the scheme which shows four transactions where
+  vault_deposit, vault_recovery, unvault and unvault_recovery will be pre-signed.
+  At the time of unvaulting the co-signers will require a proof that the tx they
+  are signing has the relative time lock set correctly. This gives assurance that
+  the user or a watchtower will have time to sweep the funds in the case of an
+  unauthorized vault.
+
+  Halseth also provided a [prototype implementation][halseth prototype] available for regtest and
+  signer
+
+FIXME:bitschmidty
+
+## Changing consensus
+
+_A monthly section summarizing proposals and discussion about changing Bitcoin's
+consensus rules._
+
+FIXME:bitschmidty
+
+## Releases and release candidates
+
+_New releases and release candidates for popular Bitcoin infrastructure
+projects. Please consider upgrading to new releases or helping to test release
+candidates._
+
+FIXME:Gustavojfe
+
+## Notable code and documentation changes
+
+_Notable recent changes in [Bitcoin Core][bitcoin core repo], [Core
+Lightning][core lightning repo], [Eclair][eclair repo], [LDK][ldk repo],
+[LND][lnd repo], [libsecp256k1][libsecp256k1 repo], [Hardware Wallet Interface
+(HWI)][hwi repo], [Rust Bitcoin][rust bitcoin repo], [BTCPay
+Server][btcpay server repo], [BDK][bdk repo], [Bitcoin Improvement Proposals
+(BIPs)][bips repo], [Lightning BOLTs][bolts repo], [Lightning
+BLIPs][blips repo], [Bitcoin Inquisition][bitcoin inquisition repo], and
+[BINANAs][binana repo]._
+
+FIXME:Gustavojfe
+
+{% include snippets/recap-ad.md when="2026-01-06 17:30" %}
+{% include references.md %} {% include linkers/issues.md v=2 issues="" %}
+[halseth post]: https://delvingbitcoin.org/t/building-a-vault-using-blinded-co-signers/2141
+[halseth prototype]: https://github.com/halseth/blind-vault
+[topic musig]: /en/topics/musig/
+[topic vaults]: /en/topics/vaults/