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0.21.1 Release Notes
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====================
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Bitcoin Core version 0.21.1 is now available from:
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<https://bitcoincore.org/bin/bitcoin-core-0.21.1/>
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This minor release includes 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 Mac)
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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, macOS 10.12+, 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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From Bitcoin Core 0.20.0 onwards, macOS versions earlier than 10.12 are no
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longer supported. Additionally, Bitcoin Core does not yet change appearance
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when macOS "dark mode" is activated.
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Notable changes
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===============
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RPC
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---
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0.21.1 change log
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=================
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### Consensus
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- #21377 Speedy trial support for versionbits (ajtowns)
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- #21686 Speedy trial activation parameters for Taproot (achow101)
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### P2P protocol and network code
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- #20852 allow CSubNet of non-IP networks (vasild)
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- #21043 Avoid UBSan warning in ProcessMessage(…) (practicalswift)
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### Wallet
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- #21166 Introduce DeferredSignatureChecker and have SignatureExtractorClass subclass it (achow101)
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- #21083 Avoid requesting fee rates multiple times during coin selection (achow101)
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### RPC and other APIs
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- #21201 Disallow sendtoaddress and sendmany when private keys disabled (achow101)
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### Build system
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- #21486 link against -lsocket if required for `*ifaddrs` (fanquake)
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- #20983 Fix MSVC build after gui#176 (hebasto)
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### Tests and QA
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- #21380 Add fuzzing harness for versionbits (ajtowns)
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- #20812 fuzz: Bump FuzzedDataProvider.h (MarcoFalke)
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- #20740 fuzz: Update FuzzedDataProvider.h from upstream (LLVM) (practicalswift)
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- #21446 Update vcpkg checkout commit (sipsorcery)
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- #21397 fuzz: Bump FuzzedDataProvider.h (MarcoFalke)
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- #21081 Fix the unreachable code at `feature_taproot` (brunoerg)
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- #20562 Test that a fully signed tx given to signrawtx is unchanged (achow101)
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- #21571 Make sure non-IP peers get discouraged and disconnected (vasild, MarcoFalke)
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- #21489 fuzz: cleanups for versionbits fuzzer (ajtowns)
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### Miscellaneous
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- #20861 BIP 350: Implement Bech32m and use it for v1+ segwit addresses (sipa)
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### Documentation
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- #21384 add signet to bitcoin.conf documentation (jonatack)
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- #21342 Remove outdated comment (hebasto)
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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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- Aaron Clauson
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- Andrew Chow
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- Anthony Towns
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- Bruno Garcia
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- Fabian Jahr
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- fanquake
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- Hennadii Stepanov
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- Jon Atack
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- Luke Dashjr
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- MarcoFalke
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- Pieter Wuille
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- practicalswift
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- randymcmillan
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- Sjors Provoost
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- Vasil Dimov
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- W. J. van der Laan
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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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