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 very old versions of Bitcoin Core or Knots is possible, but it might take some time if the data directory needs to be migrated. Old wallet versions of Bitcoin Knots are generally supported.

Compatibility

Bitcoin Knots is supported on operating systems using the Linux kernel, macOS 13+, and Windows 10+. It is not recommended to use Bitcoin Knots on unsupported systems.

Known Bugs

In various locations, including the GUI's transaction details dialog and the "vsize" result in many RPC results, transaction virtual sizes may not account for an unusually high number of sigops (ie, as determined by the -bytespersigop policy) or datacarrier penalties (ie, -datacarriercost). This could result in reporting a lower virtual size than is actually used for mempool or mining purposes.

Due to disruption of the shared Bitcoin Transifex repository, this release still does not include updated translations, and Bitcoin Knots may be unable to do so until/unless that is resolved.

Notable changes

The low severity service degradation vulnerability CVE-2025-46598 has been fixed.
The default policy for datacarriersize has been increased to allow 83 bytes. While not ideal, some legacy protocols still rely on 83-byte datacarrier outputs, and it is undesirable to risk breaking those as Knots adoption grows. This is expected to be a temporary adjustment until these older applications can be updated to not require extra data, and will be reverted back to 42 in a future version. Users with a preference are encouraged to explicitly set it themselves.
Memory pressure detection is no longer enabled by default. It has been found to misbehave in some configurations. If you wish to re-enable it, you can do so with the -lowmem=<n> configuration option.

Consensus

bitcoin#32473 Introduce per-txin sighash midstate cache for legacy/p2sh/segwitv0 scripts

Policy

Default policy: Increase datacarriersize to 83 bytes

P2P and network changes

bitcoin#33050 net, validation: don't punish peers for consensus-invalid txs
bitcoin#33105 validation: detect witness stripping without re-running Script checks
bitcoin#33738 log,blocks: avoid GetHash() work when logging is disabled
bitcoin#33813 Changing the rpcbind argument being ignored to a pop up warning, instead of a debug log

GUI

bitcoin#8501 GUI: MempoolStats: Use min relay fee when mempool has none
gui#901 qt: add createwallet and createwalletdescriptor to history filter

Wallet

bitcoin#31514 bugfix: disallow label for ranged descriptors & allow external non-ranged descriptors to have label

Block and transaction handling

bitcoin#19873 mempressure: Disable by default for now

Test

bitcoin#33698 test: Use same rpc timeout for authproxy and cli

CI

bitcoin#33639 ci: Only write docker build images to Cirrus cache

Credits

Thanks to everyone who directly contributed to this release:

Ataraxia
/dev/fd0
Anthony Towns
Antoine Poinsot
Lőrinc
Luke Dashjr
MarcoFalke
Pieter Wuille
scgbckbone
WakeTrainDev

bitcoinknots/bitcoin v29.2.knots20251110 Bitcoin Knots v29.2.knots20251110 on GitHub