Bitcoin Forum

26.1 Release Notes

Bitcoin Core version 26.1 is now available from:

https://bitcoincore.org/bin/bitcoin-core-26.1/ (https://bitcoincore.org/bin/bitcoin-core-26.1/)

This release includes 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 (https://github.com/bitcoin/bitcoin/issues)

To receive security and update notifications, please subscribe to:

https://bitcoincore.org/en/list/announcements/join/ (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, 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

Wallet

• #28994 (https://github.com/bitcoin/bitcoin/pull/28994) wallet: skip BnB when SFFO is enabled
• #28920 (https://github.com/bitcoin/bitcoin/pull/28920) wallet: birth time update during tx scanning
• #29176 (https://github.com/bitcoin/bitcoin/pull/29176) wallet: Fix use-after-free in WalletBatch::EraseRecords
• #29510 (https://github.com/bitcoin/bitcoin/pull/29510) wallet: getrawchangeaddress and getnewaddress failures should not affect keypools for descriptor wallets

RPC

• #29003 (https://github.com/bitcoin/bitcoin/pull/29003) rpc: fix getrawtransaction segfault
• #28784 (https://github.com/bitcoin/bitcoin/pull/28784) rpc: keep .cookie file if it was not generated

Logs

• #29227 (https://github.com/bitcoin/bitcoin/pull/29227) log mempool loading progress

P2P and network changes

• #29200 (https://github.com/bitcoin/bitcoin/pull/29200) net: create I2P sessions using both ECIES-X25519 and ElGamal encryption
• #29412 (https://github.com/bitcoin/bitcoin/pull/29412) p2p: Don't process mutated blocks
• #29524 (https://github.com/bitcoin/bitcoin/pull/29524) p2p: Don't consider blocks mutated if they don't connect to known prev block

Build

• #29127 (https://github.com/bitcoin/bitcoin/pull/29127) Use hardened runtime on macOS release builds.
• #29195 (https://github.com/bitcoin/bitcoin/pull/29195) build: Fix -Xclang -internal-isystem option

CI

• #28992 (https://github.com/bitcoin/bitcoin/pull/28992) ci: Use Ubuntu 24.04 Noble for asan,tsan,tidy,fuzz
• #29080 (https://github.com/bitcoin/bitcoin/pull/29080) ci: Set HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK to avoid unrelated failures
• #29610 (https://github.com/bitcoin/bitcoin/pull/29610) ci: Fix "macOS native" job

Miscellaneous

• #28391 (https://github.com/bitcoin/bitcoin/pull/28391) refactor: Simplify CTxMempool/BlockAssembler fields, remove some external mapTx access
• #29179 (https://github.com/bitcoin/bitcoin/pull/29179) test: wallet rescan with reorged parent + IsFromMe child in mempool
• #28791 (https://github.com/bitcoin/bitcoin/pull/28791) snapshots: don't core dump when running -checkblockindex after loadtxoutset
• #29357 (https://github.com/bitcoin/bitcoin/pull/29357) test: Drop x modifier in fsbridge::fopen call for MinGW builds
• #29529 (https://github.com/bitcoin/bitcoin/pull/29529) fuzz: restrict fopencookie usage to Linux & FreeBSD

Credits

Thanks to everyone who directly contributed to this release:

• dergoegge
• fanquake
• furszy
• glozow
• Greg Sanders
• Hennadii Stepanov
• Jon Atack
• MarcoFalke
• Mark Friedenbach
• Martin Zumsande
• Murch
• Roman Zeyde
• stickies-v
• UdjinM6

As well as to everyone that helped with translations on
Transifex (https://www.transifex.com/bitcoin/bitcoin/).