24.0.1 Release Notes Due to last-minute issues (#26616), 24.0, although tagged, was never fully announced or released. Bitcoin Core version 24.0.1 is now available from: https://bitcoincore.org/bin/bitcoin-core-24.0.1/ 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, macOS 10.15+, 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. Notice of new option for transaction replacement policies This version of Bitcoin Core adds a new mempoolfullrbf configuration option which allows users to change the policy their individual node will use for relaying and mining unconfirmed transactions. The option defaults to the same policy that was used in previous releases and no changes to node policy will occur if everyone uses the default. Some Bitcoin services today expect that the first version of an unconfirmed transaction that they see will be the version of the transaction that ultimately gets confirmed---a transaction acceptance policy sometimes called "first-seen". The Bitcoin Protocol does not, and cannot, provide any assurance that the first version of an unconfirmed transaction seen by a particular node will be the version that gets confirmed. If there are multiple versions of the same unconfirmed transaction available, only the miner who includes one of those transactions in a block gets to decide which version of the transaction gets confirmed. Despite this lack of assurance, multiple merchants and services today still make this assumption. There are several benefits to users from removing this first-seen simplification. One key benefit, the ability for the sender of a transaction to replace it with an alternative version paying higher fees, was realized in Bitcoin Core 0.12.0 (February 2016) with the introduction of BIP125 opt-in Replace By Fee (RBF). Since then, there has been discussion about completely removing the first-seen simplification and allowing users to replace any of their older unconfirmed transactions with newer transactions, a feature called full-RBF. This release includes a mempoolfullrbf configuration option that allows enabling full-RBF, although it defaults to off (allowing only opt-in RBF). Several alternative node implementations have already enabled full-RBF by default for years, and several contributors to Bitcoin Core are advocating for enabling full-RBF by default in a future version of Bitcoin Core. As more nodes that participate in relay and mining begin enabling full-RBF, replacement of unconfirmed transactions by ones offering higher fees may rapidly become more reliable. Contributors to this project strongly recommend that merchants and services not accept unconfirmed transactions as final, and if they insist on doing so, to take the appropriate steps to ensure they have some recourse or plan for when their assumptions do not hold. Notable changes P2P and network changes

To address a potential denial-of-service, the logic to download headers from peers
has been reworked. This is particularly relevant for nodes starting up for the
first time (or for nodes which are starting up after being offline for a long time).

Whenever headers are received from a peer that have a total chainwork that is either
less than the node's -minimumchainwork value or is sufficiently below the work at
the node's tip, a "presync" phase will begin, in which the node will download the
peer's headers and verify the cumulative work on the peer's chain, prior to storing
those headers permanently. Once that cumulative work is verified to be sufficiently high,
the headers will be redownloaded from that peer and fully validated and stored.

This may result in initial headers sync taking longer for new nodes starting up for
the first time, both because the headers will be downloaded twice, and because the effect
of a peer disconnecting during the presync phase (or while the node's best headers chain has less
than -minimumchainwork), will result in the node needing to use the headers presync mechanism
with the next peer as well (downloading the headers twice, again). (#25717)
With I2P connections, a new, transient address is used for each outbound
connection if -i2pacceptincoming=0. (#25355)

Updated RPCs

The -deprecatedrpc=softforks configuration option has been removed. The
RPC getblockchaininfo no longer returns the softforks field, which was
previously deprecated in 23.0. (#23508) Information on soft fork status is
now only available via the getdeploymentinfo RPC.
The deprecatedrpc=exclude_coinbase configuration option has been removed.
The receivedby RPCs (listreceivedbyaddress, listreceivedbylabel,
getreceivedbyaddress and getreceivedbylabel) now always return results
accounting for received coins from coinbase outputs, without an option to
change that behaviour. Excluding coinbases was previously deprecated in 23.0.
(#25171)
The deprecatedrpc=fees configuration option has been removed. The top-level
fee fields fee, modifiedfee, ancestorfees and descendantfees are no
longer returned by RPCs getmempoolentry, getrawmempool(verbose=true),
getmempoolancestors(verbose=true) and getmempooldescendants(verbose=true).
The same fee fields can be accessed through the fees object in the result.
The top-level fee fields were previously deprecated in 23.0. (#25204)
The getpeerinfo RPC has been updated with a new presynced_headers field,
indicating the progress on the presync phase mentioned in the
"P2P and network changes" section above.

Changes to wallet related RPCs can be found in the Wallet section below. New RPCs

The sendall RPC spends specific UTXOs to one or more recipients
without creating change. By default, the sendall RPC will spend
every UTXO in the wallet. sendall is useful to empty wallets or to
create a changeless payment from select UTXOs. When creating a payment
from a specific amount for which the recipient incurs the transaction
fee, continue to use the subtractfeefromamount option via the
send, sendtoaddress, or sendmany RPCs. (#24118)
A new gettxspendingprevout RPC has been added, which scans the mempool to find
transactions spending any of the given outpoints. (#24408)
The simulaterawtransaction RPC iterates over the inputs and outputs of the given
transactions, and tallies up the balance change for the given wallet. This can be
useful e.g. when verifying that a coin join like transaction doesn't contain unexpected
inputs that the wallet will then sign for unintentionally. (#22751)

Updated REST APIs

The /headers/ and /blockfilterheaders/ endpoints have been updated to use
a query parameter instead of path parameter to specify the result count. The
count parameter is now optional, and defaults to 5 for both endpoints. The old
endpoints are still functional, and have no documented behaviour change.

For /headers, use
GET /rest/headers/<BLOCK-HASH>.<bin|hex|json>?count=<COUNT=5>
instead of
GET /rest/headers/<COUNT>/<BLOCK-HASH>.<bin|hex|json> (deprecated)

For /blockfilterheaders/, use
GET /rest/blockfilterheaders/<FILTERTYPE>/<BLOCK-HASH>.<bin|hex|json>?count=<COUNT=5>
instead of
GET /rest/blockfilterheaders/<FILTERTYPE>/<COUNT>/<BLOCK-HASH>.<bin|hex|json> (deprecated)

(#24098)

Build System

Guix builds are now reproducible across architectures (x86_64 & aarch64). (#21194)

New settings

A new mempoolfullrbf option has been added, which enables the mempool to
accept transaction replacement without enforcing BIP125 replaceability
signaling. (#25353)

Wallet

The -walletrbf startup option will now default to true. The
wallet will now default to opt-in RBF on transactions that it creates. (#25610)
The replaceable option for the createrawtransaction and
createpsbt RPCs will now default to true. Transactions created
with these RPCs will default to having opt-in RBF enabled. (#25610)
The wsh() output descriptor was extended with Miniscript support. You can import Miniscript
descriptors for P2WSH in a watchonly wallet to track coins, but you can't spend from them using
the Bitcoin Core wallet yet.
You can find more about Miniscript on the reference website. (#24148)
The tr() output descriptor now supports multisig scripts through the multi_a() and
sortedmulti_a() functions. (#24043)
To help prevent fingerprinting transactions created by the Bitcoin Core wallet, change output
amounts are now randomized. (#24494)
The listtransactions, gettransaction, and listsinceblock
RPC methods now include a wtxid field (hash of serialized transaction,
including witness data) for each transaction. (#24198)
The listsinceblock, listtransactions and gettransaction output now contain a new
parent_descs field for every "receive" entry. (#25504)
A new optional include_change parameter was added to the listsinceblock command.
RPC getreceivedbylabel now returns an error, "Label not found
in wallet" (-4), if the label is not in the address book. (#25122)

Migrating Legacy Wallets to Descriptor Wallets An experimental RPC migratewallet has been added to migrate Legacy (non-descriptor) wallets to Descriptor wallets. More information about the migration process is available in the documentation. GUI changes

A new menu item to restore a wallet from a backup file has been added (gui#471).
Configuration changes made in the bitcoin GUI (such as the pruning setting,
proxy settings, UPNP preferences) are now saved to <datadir>/settings.json
file rather than to the Qt settings backend (windows registry or unix desktop
config files), so these settings will now apply to bitcoind, instead of being
ignored. (#15936, gui#602)
Also, the interaction between GUI settings and bitcoin.conf settings is
simplified. Settings from bitcoin.conf are now displayed normally in the GUI
settings dialog, instead of in a separate warning message ("Options set in this
dialog are overridden by the configuration file: -setting=value"). And these
settings can now be edited because settings.json values take precedence over
bitcoin.conf values. (#15936)

Low-level changes RPC

The deriveaddresses, getdescriptorinfo, importdescriptors and scantxoutset commands now
accept Miniscript expression within a wsh() descriptor. (#24148)
The getaddressinfo, decodescript, listdescriptors and listunspent commands may now output
a Miniscript descriptor inside a wsh() where a wsh(raw()) descriptor was previously returned. (#24148)

Credits Thanks to everyone who directly contributed to this release:

/dev/fd0
0xb10c
Adam Jonas
akankshakashyap
Ali Sherief
amadeuszpawlik
Andreas Kouloumos
Andrew Chow
Anthony Towns
Antoine Poinsot
Antoine Riard
Aurèle Oulès
avirgovi
Ayush Sharma
Baas
Ben Woosley
BrokenProgrammer
brunoerg
brydinh
Bushstar
Calvin Kim
CAnon
Carl Dong
chinggg
Cory Fields
Daniel Kraft
Daniela Brozzoni
darosior
Dave Scotese
David Bakin
dergoegge
dhruv
Dimitri
dontbyte
Duncan Dean
eugene
Eunoia
Fabian Jahr
furszy
Gleb Naumenko
glozow
Greg Weber
Gregory Sanders
gruve-p
Hennadii Stepanov
hiago
Igor Bubelov
ishaanam
Jacob P.
Jadi
James O'Beirne
Janna
Jarol Rodriguez
Jeremy Rand
Jeremy Rubin
jessebarton
João Barbosa
John Newbery
Jon Atack
Josiah Baker
Karl-Johan Alm
KevinMusgrave
Kiminuo
klementtan
Kolby Moroz
kouloumos
Kristaps Kaupe
Larry Ruane
Luke Dashjr
MarcoFalke
Marnix
Martin Leitner-Ankerl
Martin Zumsande
Michael Dietz
Michael Folkson
Michael Ford
Murch
mutatrum
muxator
Oskar Mendel
Pablo Greco
pasta
Patrick Strateman
Pavol Rusnak
Peter Bushnell
phyBrackets
Pieter Wuille
practicalswift
randymcmillan
Robert Spigler
Russell Yanofsky
S3RK
Samer Afach
Sebastian Falbesoner
Seibart Nedor
Shashwat
Sjors Provoost
Smlep
sogoagain
Stacie
Stéphan Vuylsteke
Suhail Saqan
Suhas Daftuar
t-bast
TakeshiMusgrave
Vasil Dimov
W. J. van der Laan
w0xlt
whiteh0rse
willcl-ark
William Casarin
Yancy Ribbens

As well as to everyone that helped with translations on Transifex.

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