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    April 20, 2024, 02:12:50 PM
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    27.0 Release Notes

    Bitcoin Core version 27.0 is now available from:

    https://bitcoincore.org/bin/bitcoin-core-27.0/

    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 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

    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 has
      become a maintenance burden.

      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.

      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 for 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=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)
    • 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)

    Mempool Policy Changes
    • 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)

    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 (#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)

    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
    • 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
    • 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.

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