[WIP] doc: release notes for 27.x

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Bitcoin Core version 27.0 is now available from:
Bitcoin Core version 27.x is now available from:
<https://bitcoincore.org/bin/bitcoin-core-27.0/>
<https://bitcoincore.org/bin/bitcoin-core-27.x/>
This release includes new features, various bug fixes and performance
This release includes various bug fixes and performance
improvements, as well as updated translations.
Please report bugs using the issue tracker at GitHub:
@ -37,181 +37,55 @@ unsupported systems.
Notable changes
===============
libbitcoinconsensus
-------------------
### Miniscript
- libbitcoinconsensus is deprecated and will be removed for v28. This library has
existed for nearly 10 years with very little known uptake or impact. It has
become a maintenance burden.
- #29853 sign: don't assume we are parsing a sane TapMiniscript
The underlying functionality does not change between versions, so any users of
the library can continue to use the final release indefinitely, with the
understanding that Taproot is its final consensus update.
### RPC
In the future, libbitcoinkernel will provide a much more useful API that is
aware of the UTXO set, and therefore be able to fully validate transactions and
blocks. (#29189)
- #29869 rpc, bugfix: Enforce maximum value for setmocktime
- #29870 rpc: Reword SighashFromStr error message
mempool.dat compatibility
-------------------------
### Index
- The `mempool.dat` file created by -persistmempool or the savemempool RPC will
be written in a new format. This new format includes the XOR'ing of transaction
contents to mitigate issues where external programs (such as anti-virus) attempt
to interpret and potentially modify the file.
- #29776 Fix #29767, set m_synced = true after Commit()
This new format can not be read by previous software releases. To allow for a
downgrade, a temporary setting `-persistmempoolv1` has been added to fall back
to the legacy format. (#28207)
### Test
P2P and network changes
-----------------------
- #29892 test: Fix failing univalue float test
- BIP324 v2 transport is now enabled by default. It remains possible to disable v2
by running with `-v2transport=0`. (#29347)
- Manual connection options (`-connect`, `-addnode` and `-seednode`) will
now follow `-v2transport` to connect with v2 by default. They will retry with
v1 on failure. (#29058)
### Build
- Network-adjusted time has been removed from consensus code. It is replaced
with (unadjusted) system time. The warning for a large median time offset
(70 minutes or more) is kept. This removes the implicit security assumption of
requiring an honest majority of outbound peers, and increases the importance
of the node operator ensuring their system time is (and stays) correct to not
fall out of consensus with the network. (#28956)
- #29747 depends: fix mingw-w64 Qt DEBUG=1 build
- #29859 build: Fix false positive CHECK_ATOMIC test
- #29985 depends: Fix build of Qt for 32-bit platforms with recent glibc
Mempool Policy Changes
----------------------
### Doc
- Opt-in Topologically Restricted Until Confirmation (TRUC) Transactions policy
(aka v3 transaction policy) is available for use on test networks when
`-acceptnonstdtxn=1` is set. By setting the transaction version number to 3, TRUC transactions
request the application of limits on spending of their unconfirmed outputs. These
restrictions simplify the assessment of incentive compatibility of accepting or
replacing TRUC transactions, thus ensuring any replacements are more profitable for
the node and making fee-bumping more reliable. TRUC transactions are currently
nonstandard and can only be used on test networks where the standardness rules are
relaxed or disabled (e.g. with `-acceptnonstdtxn=1`). (#28948)
- #29934 doc: add LLVM instruction for macOS < 13
External Signing
----------------
### CI
- Support for external signing on Windows has been disabled. It will be re-enabled
once the underlying dependency (Boost Process), has been replaced with a different
library. (#28967)
- #29856 ci: Bump s390x to ubuntu:24.04
Updated RPCs
------------
### Misc
- The addnode RPC now follows the `-v2transport` option (now on by default, see above) for making connections.
It remains possible to specify the transport type manually with the v2transport argument of addnode. (#29239)
Build System
------------
- A C++20 capable compiler is now required to build Bitcoin Core. (#28349)
- MacOS releases are configured to use the hardened runtime libraries (#29127)
Wallet
------
- The CoinGrinder coin selection algorithm has been introduced to mitigate unnecessary
large input sets and lower transaction costs at high feerates. CoinGrinder
searches for the input set with minimal weight. Solutions found by
CoinGrinder will produce a change output. CoinGrinder is only active at
elevated feerates (default: 30+sat/vB, based on `-consolidatefeerate`×3). (#27877)
- The Branch And Bound coin selection algorithm will be disabled when the subtract fee
from outputs feature is used. (#28994)
- If the birth time of a descriptor is detected to be later than the first transaction
involving that descriptor, the birth time will be reset to the earlier time. (#28920)
Low-level changes
=================
Pruning
-------
- When pruning during initial block download, more blocks will be pruned at each
flush in order to speed up the syncing of such nodes. (#20827)
Init
----
- Various fixes to prevent issues where subsequent instances of Bitcoin Core would
result in deletion of files in use by an existing instance. (#28784, #28946)
- Improved handling of empty `settings.json` files. (#29144)
- #29691 Change Luke Dashjr seed to dashjr-list-of-p2p-nodes.us
Credits
=======
Thanks to everyone who directly contributed to this release:
- 22388o⚡
- Aaron Clauson
- Amiti Uttarwar
- Andrew Toth
- Anthony Towns
- Antoine Poinsot
- Ava Chow
- Brandon Odiwuor
- brunoerg
- Chris Stewart
- Cory Fields
- dergoegge
- djschnei21
- Fabian Jahr
- fanquake
- furszy
- Gloria Zhao
- Greg Sanders
- Hennadii Stepanov
- Hernan Marino
- iamcarlos94
- ismaelsadeeq
- Jameson Lopp
- Jesse Barton
- John Moffett
- Jon Atack
- josibake
- jrakibi
- Justin Dhillon
- Kashif Smith
- kevkevin
- Kristaps Kaupe
- L0la L33tz
- laanwj
- Luke Dashjr
- Lőrinc
- marco
- MarcoFalke
- Mark Friedenbach
- Marnix
- Martin Leitner-Ankerl
- Martin Zumsande
- Max Edwards
- Murch
- muxator
- naiyoma
- Nikodemas Tuckus
- ns-xvrn
- pablomartin4btc
- Peter Todd
- Pieter Wuille
- Richard Myers
- Roman Zeyde
- Russell Yanofsky
- Ryan Ofsky
- Sebastian Falbesoner
- Sergi Delgado Segura
- nanlour
- Sjors Provoost
- stickies-v
- stratospher
- Supachai Kheawjuy
- TheCharlatan
- UdjinM6
- Vasil Dimov
- w0xlt
- willcl-ark
As well as to everyone that helped with translations on
[Transifex](https://www.transifex.com/bitcoin/bitcoin/).