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diff --git a/doc/release-notes.md b/doc/release-notes.md index 00dcd64917..5060068328 100644 --- a/doc/release-notes.md +++ b/doc/release-notes.md @@ -1 +1,217 @@ -See https://github.com/bitcoin-core/bitcoin-devwiki/wiki/27.0-Release-Notes-Draft +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](https://www.transifex.com/bitcoin/bitcoin/). |