[bitcoin-core-dev] Bitcoin Core 0.21.1 release candidate 1 available

[W. J. van der Laan]

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Binaries for bitcoin Core version 0.21.1rc1 are available from:

    https://bitcoincore.org/bin/bitcoin-core-0.21.1/test.rc1/

Source code can be found in git under the signed tag

    https://github.com/bitcoin/bitcoin/tree/v0.21.1rc1

This is a release candidate for a new major version release.

Preliminary release notes for the release can be found here:

    https://github.com/bitcoin/bitcoin/blob/0.21/doc/release-notes.md

Release candidates are test versions for releases. When no critical problems
are found, this release candidate will be tagged as 0.21.1.

Please report bugs using the issue tracker at github:

    https://github.com/bitcoin/bitcoin/issues

Change log since 0.21.0:

### Consensus
- - #21377 Speedy trial support for versionbits (ajtowns)
- - #21686 Speedy trial activation parameters for Taproot (achow101)

### P2P protocol and network code
- - #20852 allow CSubNet of non-IP networks (vasild)
- - #21043 Avoid UBSan warning in ProcessMessage(…) (practicalswift)

### Wallet
- - #21166 Introduce DeferredSignatureChecker and have SignatureExtractorClass subclass it (achow101)
- - #21083 Avoid requesting fee rates multiple times during coin selection (achow101)

### RPC and other APIs
- - #21201 Disallow sendtoaddress and sendmany when private keys disabled (achow101)

### Build system
- - #21486 link against -lsocket if required for `*ifaddrs` (fanquake)
- - #20983 Fix MSVC build after gui#176 (hebasto)

### Tests and QA
- - #21380 Add fuzzing harness for versionbits (ajtowns)
- - #20812 fuzz: Bump FuzzedDataProvider.h (MarcoFalke)
- - #20740 fuzz: Update FuzzedDataProvider.h from upstream (LLVM) (practicalswift)
- - #21446 Update vcpkg checkout commit (sipsorcery)
- - #21397 fuzz: Bump FuzzedDataProvider.h (MarcoFalke)
- - #21081 Fix the unreachable code at `feature_taproot` (brunoerg)
- - #20562 Test that a fully signed tx given to signrawtx is unchanged (achow101)
- - #21571 Make sure non-IP peers get discouraged and disconnected (vasild, MarcoFalke)
- - #21489 fuzz: cleanups for versionbits fuzzer (ajtowns)

### Miscellaneous
- - #20861 BIP 350: Implement Bech32m and use it for v1+ segwit addresses (sipa)

### Documentation
- - #21384 add signet to bitcoin.conf documentation (jonatack)
- - #21342 Remove outdated comment (hebasto)
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