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Bitcoin Core version 27.0 is now available from:
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<https://bitcoincore.org/bin/bitcoin-core-27.0/>
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This release includes new features, various bug fixes and performance
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improvements, as well as updated translations.
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Please report bugs using the issue tracker at GitHub:
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<https://github.com/bitcoin/bitcoin/issues>
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To receive security and update notifications, please subscribe to:
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<https://bitcoincore.org/en/list/announcements/join/>
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How to Upgrade
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==============
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If you are running an older version, shut it down. Wait until it has completely
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shut down (which might take a few minutes in some cases), then run the
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installer (on Windows) or just copy over `/Applications/Bitcoin-Qt` (on macOS)
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or `bitcoind`/`bitcoin-qt` (on Linux).
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Upgrading directly from a version of Bitcoin Core that has reached its EOL is
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possible, but it might take some time if the data directory needs to be migrated. Old
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wallet versions of Bitcoin Core are generally supported.
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Compatibility
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==============
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Bitcoin Core is supported and extensively tested on operating systems
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using the Linux Kernel 3.17+, macOS 11.0+, and Windows 7 and newer. Bitcoin
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Core should also work on most other Unix-like systems but is not as
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frequently tested on them. It is not recommended to use Bitcoin Core on
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unsupported systems.
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Notable changes
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===============
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libbitcoinconsensus
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-------------------
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- libbitcoinconsensus is deprecated and will be removed for v28. This library has
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existed for nearly 10 years with very little known uptake or impact. It has
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become a maintenance burden.
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The underlying functionality does not change between versions, so any users of
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the library can continue to use the final release indefinitely, with the
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understanding that Taproot is its final consensus update.
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In the future, libbitcoinkernel will provide a much more useful API that is
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aware of the UTXO set, and therefore be able to fully validate transactions and
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blocks. (#29189)
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mempool.dat compatibility
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-------------------------
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- The `mempool.dat` file created by -persistmempool or the savemempool RPC will
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be written in a new format. This new format includes the XOR'ing of transaction
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contents to mitigate issues where external programs (such as anti-virus) attempt
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to interpret and potentially modify the file.
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This new format can not be read by previous software releases. To allow for a
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downgrade, a temporary setting `-persistmempoolv1` has been added to fall back
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to the legacy format. (#28207)
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P2P and network changes
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-----------------------
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- BIP324 v2 transport is now enabled by default. It remains possible to disable v2
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by running with `-v2transport=0`. (#29347)
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- Manual connection options (`-connect`, `-addnode` and `-seednode`) will
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now follow `-v2transport` to connect with v2 by default. They will retry with
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v1 on failure. (#29058)
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- Network-adjusted time has been removed from consensus code. It is replaced
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with (unadjusted) system time. The warning for a large median time offset
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(70 minutes or more) is kept. This removes the implicit security assumption of
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requiring an honest majority of outbound peers, and increases the importance
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of the node operator ensuring their system time is (and stays) correct to not
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fall out of consensus with the network. (#28956)
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Mempool Policy Changes
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----------------------
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- Opt-in Topologically Restricted Until Confirmation (TRUC) Transactions policy
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(aka v3 transaction policy) is available for use on test networks when
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`-acceptnonstdtxn=1` is set. By setting the transaction version number to 3, TRUC transactions
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request the application of limits on spending of their unconfirmed outputs. These
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restrictions simplify the assessment of incentive compatibility of accepting or
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replacing TRUC transactions, thus ensuring any replacements are more profitable for
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the node and making fee-bumping more reliable. TRUC transactions are currently
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nonstandard and can only be used on test networks where the standardness rules are
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relaxed or disabled (e.g. with `-acceptnonstdtxn=1`). (#28948)
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External Signing
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----------------
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- Support for external signing on Windows has been disabled. It will be re-enabled
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once the underlying dependency (Boost Process), has been replaced with a different
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library. (#28967)
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Updated RPCs
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------------
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- The addnode RPC now follows the `-v2transport` option (now on by default, see above) for making connections.
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It remains possible to specify the transport type manually with the v2transport argument of addnode. (#29239)
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Build System
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------------
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- A C++20 capable compiler is now required to build Bitcoin Core. (#28349)
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- MacOS releases are configured to use the hardened runtime libraries (#29127)
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Wallet
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------
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- The CoinGrinder coin selection algorithm has been introduced to mitigate unnecessary
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large input sets and lower transaction costs at high feerates. CoinGrinder
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searches for the input set with minimal weight. Solutions found by
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CoinGrinder will produce a change output. CoinGrinder is only active at
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elevated feerates (default: 30+ sat/vB, based on `-consolidatefeerate`×3). (#27877)
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- The Branch And Bound coin selection algorithm will be disabled when the subtract fee
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from outputs feature is used. (#28994)
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- If the birth time of a descriptor is detected to be later than the first transaction
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involving that descriptor, the birth time will be reset to the earlier time. (#28920)
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Low-level changes
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=================
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Pruning
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-------
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- When pruning during initial block download, more blocks will be pruned at each
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flush in order to speed up the syncing of such nodes. (#20827)
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Init
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----
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- Various fixes to prevent issues where subsequent instances of Bitcoin Core would
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result in deletion of files in use by an existing instance. (#28784, #28946)
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- Improved handling of empty `settings.json` files. (#29144)
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Credits
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=======
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Thanks to everyone who directly contributed to this release:
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- 22388o⚡️
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- Aaron Clauson
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- Amiti Uttarwar
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- Andrew Toth
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- Anthony Towns
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- Antoine Poinsot
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- Ava Chow
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- Brandon Odiwuor
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- brunoerg
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- Chris Stewart
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- Cory Fields
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- dergoegge
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- djschnei21
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- Fabian Jahr
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- fanquake
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- furszy
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- Gloria Zhao
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- Greg Sanders
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- Hennadii Stepanov
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- Hernan Marino
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- iamcarlos94
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- ismaelsadeeq
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- Jameson Lopp
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- Jesse Barton
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- John Moffett
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- Jon Atack
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- josibake
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- jrakibi
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- Justin Dhillon
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- Kashif Smith
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- kevkevin
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- Kristaps Kaupe
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- L0la L33tz
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- Luke Dashjr
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- Lőrinc
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- marco
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- MarcoFalke
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- Mark Friedenbach
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- Marnix
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- Martin Leitner-Ankerl
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- Martin Zumsande
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- Max Edwards
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- Murch
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- muxator
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- naiyoma
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- Nikodemas Tuckus
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- ns-xvrn
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- pablomartin4btc
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- Peter Todd
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- Pieter Wuille
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- Richard Myers
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- Roman Zeyde
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- Russell Yanofsky
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- Ryan Ofsky
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- Sebastian Falbesoner
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- Sergi Delgado Segura
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- Sjors Provoost
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- stickies-v
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- stratospher
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- Supachai Kheawjuy
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- TheCharlatan
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- UdjinM6
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- Vasil Dimov
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- w0xlt
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- willcl-ark
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As well as to everyone that helped with translations on
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[Transifex](https://www.transifex.com/bitcoin/bitcoin/).
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