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Merge bitcoin/bitcoin#31034: [28.x] doc: Sync 28.0 release notes with…
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89d34cf doc: Sync 28.0 release notes with website (Ava Chow)

Pull request description:

  Since there were some changes to the release notes after the tagging, update the in branch release notes to match those that ended up on the website.

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Expand Up @@ -25,9 +25,9 @@ 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.

Running bitcoin core binaries on macOS requires self signing.
Running Bitcoin Core binaries on macOS requires self signing.
```
cd /path/to/bitcoin-core/bin
cd /path/to/bitcoin-28.0/bin
xattr -d com.apple.quarantine bitcoin-cli bitcoin-qt bitcoin-tx bitcoin-util bitcoin-wallet bitcoind test_bitcoin
codesign -s - bitcoin-cli bitcoin-qt bitcoin-tx bitcoin-util bitcoin-wallet bitcoind test_bitcoin
```
Expand All @@ -37,7 +37,7 @@ Compatibility

Bitcoin Core is supported and extensively tested on operating systems
using the Linux Kernel 3.17+, macOS 11.0+, and Windows 7 and newer. Bitcoin
Core should also work on most other Unix-like systems but is not as
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.

Expand All @@ -53,7 +53,7 @@ the section header is also named `[testnet4]`.

While the intention is to phase out support for Testnet3 in an upcoming
version, support for it is still available via the known options in this
release.
release. (#29775)

Windows Data Directory
----------------------
Expand All @@ -63,7 +63,22 @@ to `C:\Users\Username\AppData\Local\Bitcoin`. Bitcoin Core will check the existe
of the old directory first and continue to use that directory for backwards
compatibility if it is present. (#27064)

P2P and network changes
JSON-RPC 2.0 Support
--------------------

The JSON-RPC server now recognizes JSON-RPC 2.0 requests and responds with
strict adherence to the [specification](https://www.jsonrpc.org/specification).
See [JSON-RPC-interface.md](https://github.com/bitcoin/bitcoin/blob/master/doc/JSON-RPC-interface.md#json-rpc-11-vs-20) for details. (#27101)

JSON-RPC clients may need to be updated to be compatible with the JSON-RPC server.
Please open an issue on GitHub if any compatibility issues are found.

libbitcoinconsensus Removal
---------------------------

The libbitcoin-consensus library was deprecated in 27.0 and is now completely removed. (#29648)

P2P and Network Changes
-----------------------

- Previously if Bitcoin Core was listening for P2P connections, either using
Expand All @@ -83,30 +98,30 @@ P2P and network changes
binds had failed. (#22729)

- UNIX domain sockets can now be used for proxy connections. Set `-onion` or `-proxy`
to the local socket path with the prefix `unix:` (e.g. `-onion=unix:/home/me/torsocket`).
(#27375)
to the local socket path with the prefix `unix:` (e.g. `-onion=unix:/home/me/torsocket`).
(#27375)

- unix socket paths are now accepted for `-zmqpubrawblock` and `-zmqpubrawtx` with
the format `-zmqpubrawtx=unix:/path/to/file`
- UNIX socket paths are now accepted for `-zmqpubrawblock` and `-zmqpubrawtx` with
the format `-zmqpubrawtx=unix:/path/to/file` (#27679)

- Additional flags "in" and "out" have been added to `-whitelist` to control whether
permissions apply to incoming connections and/or manual (default: incoming only).
- Additional "in" and "out" flags have been added to `-whitelist` to control whether
permissions apply to inbound connections and/or manual ones (default: inbound only). (#27114)

- Transactions that are too low feerate will be opportunistically paired with their child
transactions and submitted as a package, thus enabling the node to download
1-parent-1-child packages using the existing transaction relay protocol. Combined with
other mempool policies, this allows limited "package relay" when a parent transaction
is below mempool minimum feerate; TRUC parents are additionally allowed to be below
minimum relay feerate (i.e. pay 0 fees). Use the `submitpackage` RPC to submit packages
directly to the node. Warning: this p2p feature is limited (unlike the `submitpackage`
interface, a child with multiple unconfirmed parents is not supported) and not yet
reliable under adversarial conditions. (#28970)
- Transactions having a feerate that is too low will be opportunistically paired with
their child transactions and submitted as a package, thus enabling the node to download
1-parent-1-child packages using the existing transaction relay protocol. Combined with
other mempool policies, this change allows limited "package relay" when a parent transaction
is below the mempool minimum feerate. Topologically Restricted Until Confirmation (TRUC)
parents are additionally allowed to be below the minimum relay feerate (i.e., pay 0 fees).
Use the `submitpackage` RPC to submit packages directly to the node. Warning: this P2P
feature is limited (unlike the `submitpackage` interface, a child with multiple unconfirmed
parents is not supported) and not yet reliable under adversarial conditions. (#28970)

Mempool Policy Changes
----------------------

- Transactions with version number set to 3 are now treated as standard on all networks (#29496),
subject to Opt-in Topologically Restricted Until Confirmation (TRUC) Transactions policy as
subject to opt-in Topologically Restricted Until Confirmation (TRUC) transaction policy as
described in [BIP 431](https://github.com/bitcoin/bips/blob/master/bip-0431.mediawiki). The
policy includes limits on spending unconfirmed outputs (#28948), eviction of a previous descendant
if a more incentive-compatible one is submitted (#29306), and a maximum transaction size of 10,000vB
Expand All @@ -120,129 +135,115 @@ Mempool Policy Changes
top of an equivalent `sh(OP_TRUE)` output, in addition to the txid stability
of the spending transaction.
N.B. propagation of this output spending on the network will be limited
until a sufficient number of nodes on the network adopt this upgrade.
until a sufficient number of nodes on the network adopt this upgrade. (#30352)

- Limited package RBF is now enabled, where the proposed conflicting package would result in
a connected component, aka cluster, of size 2 in the mempool. All clusters being conflicted
against must be of size 2 or lower.
against must be of size 2 or lower. (#28984)

- `mempoolfullrbf=1` is now set by default.
- The default value of the `-mempoolfullrbf` configuration option has been changed from 0 to 1,
i.e. `mempoolfullrbf=1`. (#30493)

Updated RPCs
------------

- The JSON-RPC server now recognizes JSON-RPC 2.0 requests and responds with
strict adherence to the [specification](https://www.jsonrpc.org/specification).
See [JSON-RPC-interface.md](https://github.com/bitcoin/bitcoin/blob/master/doc/JSON-RPC-interface.md#json-rpc-11-vs-20) for details.

- The `dumptxoutset` RPC now returns the UTXO set dump in a new and
improved format. At the same time the `loadtxoutset` RPC now
expects this new format in dumps it tries to load. Dumps with the
old format are no longer supported and need to be recreated using
the new format in order to be usable.
improved format. Correspondingly, the `loadtxoutset` RPC now expects
this new format in the dumps it tries to load. Dumps with the old
format are no longer supported and need to be recreated using the
new format to be usable. (#29612)

- AssumeUTXO mainnet parameters have been added for height 840,000.
This means the `loadtxoutset` RPC can now be used on mainnet with
the matching UTXO set from that height.
the matching UTXO set from that height. (#28553)

- The `warnings` field in `getblockchaininfo`, `getmininginfo` and
`getnetworkinfo` now returns all the active node warnings as an array
of strings, instead of just a single warning. The current behaviour
can temporarily be restored by running bitcoind with configuration
option `-deprecatedrpc=warnings`.

- Previously when using the `sendrawtransaction` rpc and specifying outputs
that are already in the UXTO set an RPC error code `-27` with RPC error
text "Transaction already in block chain" was returned in response.
The help text has been updated to "Transaction outputs already in utxo set"
to more accurately describe the source of the issue.
of strings, instead of a single warning. The current behaviour
can be temporarily restored by running Bitcoin Core with the configuration
option `-deprecatedrpc=warnings`. (#29845)

- The default mode for the `estimatesmartfee` RPC has been updated from `conservative` to `economical`.
which is expected to reduce overestimation for many users, particularly if Replace-by-Fee is an option.
For users that require high confidence in their fee estimates at the cost of potentially overestimating,
the `conservative` mode remains available.
- Previously when using the `sendrawtransaction` RPC and specifying outputs
that are already in the UTXO set, an RPC error code of `-27` with the
message "Transaction already in block chain" was returned in response.
The error message has been changed to "Transaction outputs already in utxo set"
to more accurately describe the source of the issue. (#30212)

- An item of `unspents`, of `scantxoutset`, has two new fields: `blockhash`
and `confirmations`. `blockhash` is the hash of the block where the UTXO was
created. `confirmations` is the number of confirmations of the UTXO. (#30515)
- The default mode for the `estimatesmartfee` RPC has been updated from `conservative` to `economical`,
which is expected to reduce over-estimation for many users, particularly if Replace-by-Fee is an option.
For users that require high confidence in their fee estimates at the cost of potentially over-estimating,
the `conservative` mode remains available. (#30275)

- `maxfeerate` and `maxburnamount` arguments are added to submitpackage.
- RPC `scantxoutset` now returns 2 new fields in the "unspents" JSON array: `blockhash` and `confirmations`.
See the scantxoutset help for details. (#30515)

Changes to wallet related RPCs can be found in the Wallet section below.
- RPC `submitpackage` now allows 2 new arguments to be passed: `maxfeerate` and `maxburnamount`. See the
subtmitpackage help for details. (#28950)

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

Updated REST APIs
-----------------
- Parameter validation for `/rest/getutxos` has been improved by rejecting
truncated or overly large txids and malformed outpoint indices by raising an
HTTP_BAD_REQUEST "Parse error". Previously, these malformed requests would be
silently handled. (#30482, #30444)
truncated or overly large txids and malformed outpoint indices via raising
an HTTP_BAD_REQUEST "Parse error". These requests were previously handled
silently. (#30482, #30444)

Build System
------------

- GCC 11.1 or later, or Clang 16.0 or later,
are now required to compile Bitcoin Core.
are now required to compile Bitcoin Core. (#29091, #30263)

- The minimum required glibc to run Bitcoin Core is now
2.31. This means that RHEL 8 and Ubuntu 18.04 (Bionic)
are no-longer supported. (#29987)

- `--enable-lcov-branch-coverage` has been removed, given
incompatibilities between lcov version 1 & 2. `LCOV_OPTS`
should be used to set any options instead.
should be used to set any options instead. (#30192)

Updated settings
Updated Settings
----------------

- When running with `-alertnotify`, an alert can now be raised multiple
times instead of just once. Previously, it was only raised when unknown
new consensus rules were activated, whereas the scope has now been
increased to include all kernel warnings. Specifically, alerts will now
also be raised when an invalid chain with a large amount of work has
been detected. Additional warnings may be added in the future.
(#30058)
new consensus rules were activated. Its scope has now been increased to
include all kernel warnings. Specifically, alerts will now also be raised
when an invalid chain with a large amount of work has been detected.
Additional warnings may be added in the future. (#30058)

Changes to GUI or wallet related settings can be found in the GUI or Wallet section below.

New settings
------------

Tools and Utilities
-------------------

Wallet
------

- The wallet now detects when wallet transactions conflict with the mempool. Mempool
conflicting transactions can be seen in the `"mempoolconflicts"` field of
`gettransaction`. The inputs of mempool conflicted transactions can now be respent
without manually abandoning the transactions when the parent transaction is dropped
from the mempool, which can cause wallet balances to appear higher.
- The wallet now detects when wallet transactions conflict with the mempool. Mempool-conflicting
transactions can be seen in the `"mempoolconflicts"` field of `gettransaction`. The inputs
of mempool-conflicted transactions can now be respent without manually abandoning the
transactions when the parent transaction is dropped from the mempool, which can cause wallet
balances to appear higher. (#27307)

- A new `max_tx_weight` option has been added to the RPCs `fundrawtransaction`, `walletcreatefundedpsbt`, and `send`.
It specifies the maximum transaction weight. If the limit is exceeded during funding, the transaction will not be built.
The default value is 4,000,000 WU.
The default value is 4,000,000 WU. (#29523)

- A new RPC `createwalletdescriptor` is added which allows users to add new automatically
generated descriptors to their wallet. This can be used to upgrade wallets created prior to
the introduction of a new standard descriptor, such as taproot.
- A new `createwalletdescriptor` RPC allows users to add new automatically generated
descriptors to their wallet. This can be used to upgrade wallets created prior to the
introduction of a new standard descriptor, such as taproot. (#29130)

- A new RPC `gethdkeys` is added which will list all of the BIP 32 HD keys in use by all
of the descriptors in the wallet. These keys can be used in conjunction with `createwalletdescriptor`
to create and add single key descriptors to the wallet for a particular key that the wallet
already knows.
- A new RPC `gethdkeys` lists all of the BIP32 HD keys in use by all of the descriptors in the wallet.
These keys can be used in conjunction with `createwalletdescriptor` to create and add single key
descriptors to the wallet for a particular key that the wallet already knows. (#29130)

- The `sendall` RPC can spend unconfirmed change and will include additional fees as necessary
for the resulting transaction to bump the unconfirmed transactions' feerates to the specified feerate.
- The `sendall` RPC can now spend unconfirmed change and will include additional fees as necessary
for the resulting transaction to bump the unconfirmed transactions' feerates to the specified feerate. (#28979)

- If a `fee_rate` is specified when using the `bumpfee` RPC, the feerate is no longer restricted to
following the wallet's incremental feerate of 5 sat/vb. The feerate must still be at least the sum
of the original fee and the mempool's incremental feerate.
- In RPC `bumpfee`, if a `fee_rate` is specified, the feerate is no longer restricted
to following the wallet's incremental feerate of 5 sat/vb. The feerate must still be
at least the sum of the original fee and the mempool's incremental feerate. (#27969)

GUI changes
GUI Changes
-----------

- The "Migrate Wallet" menu allows users to migrate any legacy wallet in their wallet
Expand All @@ -251,25 +252,36 @@ directory, regardless of the wallets loaded. (gui#824)
- The "Information" window now displays the maximum mempool size along with the
mempool usage. (gui#825)

Low-level changes
Low-level Changes
=================

RPC
---

Tests
-----

- The BIP94 timewarp attack mitigation is now active on the `regtest` network
- The BIP94 timewarp attack mitigation is now active on the `regtest` network. (#30681)

- `-testdatadir` is added to `test_bitcoin` to allow specifying the location for unit test data directories.
- A new `-testdatadir` option has been added to `test_bitcoin` to allow specifying the
location of unit test data directories. (#26564)

Blockstorage
------------

- Block files are now XOR'd by default with a key stored in the blocksdir.
Previous releases of Bitcoin Core or previous external software will not be able to read the blocksdir with a non-zero XOR-key.
Refer to the `-blocksxor` help for more details.
Refer to the `-blocksxor` help for more details. (#28052)

Chainstate
----------

- The chainstate database flushes that occur when blocks are pruned will no longer
empty the database cache. The cache will remain populated longer, which significantly
reduces the time for initial block download to complete. (#28280)

Dependencies
------------

- The dependency on Boost.Process has been replaced with cpp-subprocess, which is contained in source.
Builders will no longer need Boost.Process to build with external signer support. (#28981)

Credits
=======
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