Newsletters: add 399 (2026-04-03)

Author: bitschmidty

_posts/en/newsletters/2026-04-03-newsletter.md

@@ -0,0 +1,51 @@
+---
+title: 'Bitcoin Optech Newsletter #399'
+permalink: /en/newsletters/2026/04/03/
+name: 2026-04-03-newsletter
+slug: 2026-04-03-newsletter
+type: newsletter
+layout: newsletter
+lang: en
+---
+This week's newsletter describes how wallet fingerprinting can damage
+payjoin privacy and summarizes a proposal for a wallet backup metadata
+format. Also included are our regular sections summarizing proposals
+and discussion about changing Bitcoin's consensus rules, announcing new
+releases and release candidates, and describing notable changes to
+popular Bitcoin infrastructure software.
+
+## News
+
+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="2026-04-07 16:30" %}
+{% include references.md %}
+{% include linkers/issues.md v=2 issues="" %}