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Subject: [bitcoindev] Bitcoin Core 27.0 released
To: bitcoin-core-dev@lists.linuxfoundation.org, bitcoindev@googlegroups.com
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Bitcoin Core version v27.0 is now available from:
https://bitcoincore.org/bin/bitcoin-core-27.0/
Or through BitTorrent:
magnet:?xt=3Durn:btih:2b2d123e5e831b245fb1dc5b8b71f89de4a90d00&dn=3Dbit=
coin-core-27.0&tr=3Dudp%3A%2F%2Ftracker.openbittorrent.com%3A80&tr=3Dudp%3A=
%2F%2Ftracker.opentrackr.org%3A1337%2Fannounce&tr=3Dudp%3A%2F%2Ftracker.cop=
persurfer.tk%3A6969%2Fannounce&tr=3Dudp%3A%2F%2Ftracker.leechers-paradise.o=
rg%3A6969%2Fannounce&tr=3Dudp%3A%2F%2Fexplodie.org%3A6969%2Fannounce&tr=3Du=
dp%3A%2F%2Ftracker.torrent.eu.org%3A451%2Fannounce&tr=3Dudp%3A%2F%2Ftracker=
.bitcoin.sprovoost.nl%3A6969&ws=3Dhttp%3A%2F%2Fbitcoincore.org%2Fbin%2F
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
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
If you are running an older version, shut it down. Wait until it has comple=
tely
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 mac=
OS)
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
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Bitcoin Core is supported and extensively tested on operating systems
using the Linux Kernel 3.17+, macOS 11.0+, and Windows 7 and newer. 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
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
libbitcoinconsensus
-------------------
- 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 h=
as
become a maintenance burden.
The underlying functionality does not change between versions, so any use=
rs of
the library can continue to use the final release indefinitely, with the
understanding that Taproot is its final consensus update.
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)
mempool.dat compatibility
-------------------------
- 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.
This new format can not be read by previous software releases. To allow f=
or a
downgrade, a temporary setting `-persistmempoolv1` has been added to fall=
back
to the legacy format. (#28207)
P2P and network changes
-----------------------
- BIP324 v2 transport is now enabled by default. It remains possible
to disable v2
by running with `-v2transport=3D0`. (#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)
- Network-adjusted time has been removed from consensus code. It is replace=
d
with (unadjusted) system time. The warning for a large median time offset
(70 minutes or more) is kept. This removes the implicit security assumpti=
on of
requiring an honest majority of outbound peers, and increases the importa=
nce
of the node operator ensuring their system time is (and stays) correct to=
not
fall out of consensus with the network. (#28956)
Mempool Policy Changes
----------------------
- Opt-in Topologically Restricted Until Confirmation (TRUC) Transactions po=
licy
(aka v3 transaction policy) is available for use on test networks when
`-acceptnonstdtxn=3D1` 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 curr=
ently
nonstandard and can only be used on test networks where the
standardness rules are
relaxed or disabled (e.g. with `-acceptnonstdtxn=3D1`). (#28948)
External Signing
----------------
- 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)
Updated RPCs
------------
- 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 (#291=
27)
Wallet
------
- The CoinGrinder coin selection algorithm has been introduced to
mitigate unnecessary
large input sets and lower transaction costs at high feerates. CoinGrinde=
r
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+=E2=80=AFsat/vB, based on
`-consolidatefeerate`=C3=973). (#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
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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, #289=
46)
- Improved handling of empty `settings.json` files. (#29144)
Credits
=3D=3D=3D=3D=3D=3D=3D
Thanks to everyone who directly contributed to this release:
- 22388o=E2=9A=A1=EF=B8=8F
- 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
- Luke Dashjr
- L=C5=91rinc
- 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
- 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/).
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