doc: archive release notes for v31.1

doc/release-notes/release-notes-31.1.md

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+v31.1 Release Notes
+===================
+
+Bitcoin Core version 31.1 is now available from:
+
+  <https://bitcoincore.org/bin/bitcoin-core-31.1/>
+
+This release includes new features, various bug fixes and performance
+improvements, as well as updated translations.
+
+Please report bugs using the issue tracker at GitHub:
+
+  <https://github.com/bitcoin/bitcoin/issues>
+
+To receive security and update notifications, please subscribe to:
+
+  <https://bitcoincore.org/en/list/announcements/join/>
+
+How to Upgrade
+==============
+
+If you are running an older version, shut it down. Wait until it has completely
+shut down (which might take a few minutes in some cases), then run the installer
+(on Windows) or just copy over `/Applications/Bitcoin-Qt` (on macOS) or
+`bitcoind`/`bitcoin-qt` (on Linux).
+
+Upgrading directly from a version of Bitcoin Core that has reached its EOL is
+possible, but it might take some time if the data directory needs to be
+migrated. Old wallet versions of Bitcoin Core are generally supported.
+
+Compatibility
+==============
+
+Bitcoin Core is supported and tested on the following operating systems or
+newer: Linux Kernel 3.17, macOS 14, and Windows 10 (version 1903). Bitcoin Core
+should also work on most other Unix-like systems but is not as frequently tested
+on them. It is not recommended to use Bitcoin Core on unsupported systems.
+
+Notable changes
+===============
+
+### PrivateBroadcast
+
+This release fixes an ip address leak when using the -privatebroadcast feature.
+Under certain circumstances connections were being made over clearnet rather than
+the enabled privacy network.
+
+
+### Validation
+
+- #35209 validation: correct lifetime of precomputed tx data
+- #35465 coins: compact chainstate regularly
+
+### Leveldb
+
+- #61(bitcoin-core/leveldb): Disable seek compaction
+
+### P2P
+
+- #35032 net_processing: don't modify addrman for private broadcast connections
+- #35410 net: use the proxy if overriden when doing v2->v1 reconnections
+
+### Wallet
+
+- #35227 wallet: check the final BDB page LSN during migration
+- #35228 wallet: use outpoint when estimating input size
+
+### Musig
+
+- #35316 musig: Reject empty pubkey list in GetMuSig2KeyAggCache
+
+### Build
+
+- #34228 depends: Unset SOURCE_DATE_EPOCH in gen_id script
+
+### Test
+
+- #34425 test: Fix all races after a socket is closed gracefully
+- #34863 test: Clean shutdown in Socks5Server
+- #34991 test: fix feature_index_prune.py bug when using --usecli
+- #35080 test: Add missing self.options.timeout_factor scale in tool_bitcoin_chainstate.py
+- #35218 test: fix P2SH script in coins cache fuzz target
+- #35279 psbt, test: remove address type restrictions in test
+
+### Fuzz
+
+- #35289 fuzz: Fix timeout in txorphan
+
+### Util
+
+- #35384 util: Check write failures before renaming settings.json
+
+### Docs
+
+- #35283 doc: mention -DWITH_ZMQ=ON in BSD build guides
+
+### CI
+
+- #35202 ci: restore sockets in i686, no IPC job
+- #35230 ci: Move --usecli --extended from i386 task to alpine task
+- #35348 ci: switch to GitHub cache for all runners
+- #35378 ci: switch runners from cirrus to warpbuild
+- #35408 ci: 35378 followups
+- #35430 ci: use warp caching on warp runners
+- #35447 ci: use warpbuild cache for docker buildkit cache
+
+### Misc
+
+- #35044 contrib: Fix NameError in signet miner gbt()
+- #35175 multi_index: fix compilation failure with boost >= 1.91
+- #34953 crypto: disable ASan instrumentation of SSE4 SHA256 for GCC
+
+Credits
+=======
+
+Thanks to everyone who directly contributed to this release:
+
+- andrewtoth
+- Cory Fields
+- Crypt-iQ
+- darosior
+- deadmanoz
+- fanquake
+- Greg Sanders
+- Hennadii Stepanov
+- junbyjun1238
+- Lőrinc
+- MarcoFalke
+- marcofleon
+- nervana21
+- optout21
+- Pol Espinasa
+- rkrux
+- Shrey
+- Torkel Rogstad
+- Vasil Dimov
+- willcl-ark
+
+As well as to everyone that helped with translations on
+[Transifex](https://explore.transifex.com/bitcoin/bitcoin/).