Newsletters: add 400 (2026-04-10)

_posts/en/newsletters/2026-03-10-newsletter.md

@@ -0,0 +1,48 @@
+---
+title: 'Bitcoin Optech Newsletter #400'
+permalink: /en/newsletters/2026/03/10/
+name: 2026-03-10-newsletter
+slug: 2026-03-10-newsletter
+type: newsletter
+layout: newsletter
+lang: en
+---
+FIXME:bitschmidty
+
+## News
+
+FIXME:bitschmidty
+
+## Bitcoin Core PR Review Club
+
+*In this monthly section, we summarize a recent [Bitcoin Core PR Review
+Club][] meeting, highlighting some of the important questions and
+answers.  Click on a question below to see a summary of the answer from
+the meeting.*
+
+FIXME:stickies-v
+
+## 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="2026-03-14 16:30" %}
+{% include references.md %}
+{% include linkers/issues.md v=2 issues="" %}