doc: 28.0 Release Notes

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-See https://github.com/bitcoin-core/bitcoin-devwiki/wiki/28.0-Release-Notes-Draft
+Bitcoin Core version 28.0 is now available from:
+
+  <https://bitcoincore.org/bin/bitcoin-core-28.0/>
+
+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.
+
+Running bitcoin core binaries on macOS requires self signing.
+```
+cd /path/to/bitcoin-core/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
+```
+
+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
+frequently tested on them. It is not recommended to use Bitcoin Core on
+unsupported systems.
+
+Notable changes
+===============
+
+Testnet4/BIP94 support
+-----
+
+Support for Testnet4 as specified in [BIP94](https://github.com/bitcoin/bips/blob/master/bip-0094.mediawiki)
+has been added. The network can be selected with the `-testnet4` option and
+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.
+
+Windows Data Directory
+----------------------
+
+The default data directory on Windows has been moved from `C:\Users\Username\AppData\Roaming\Bitcoin`
+to `C:\Users\Username\AppData\Local\Bitcoin`. Bitcoin Core will check the existence
+of the old directory first and continue to use that directory for backwards
+compatibility if it is present. (#27064)
+
+P2P and network changes
+-----------------------
+
+- Previously if Bitcoin Core was listening for P2P connections, either using
+  default settings or via `bind=addr:port` it would always also bind to
+  `127.0.0.1:8334` to listen for Tor connections. It was not possible to switch
+  this off, even if the node didn't use Tor. This has been changed and now
+  `bind=addr:port` results in binding on `addr:port` only. The default behavior
+  of binding to `0.0.0.0:8333` and `127.0.0.1:8334` has not been changed.
+
+  If you are using a `bind=...` configuration without `bind=...=onion` and rely
+  on the previous implied behavior to accept incoming Tor connections at
+  `127.0.0.1:8334`, you need to now make this explicit by using
+  `bind=... bind=127.0.0.1:8334=onion`. (#22729)
+
+- Bitcoin Core will now fail to start up if any of its P2P binds fail, rather
+  than the previous behaviour where it would only abort startup if all P2P
+  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)
+
+- unix socket paths are now accepted for `-zmqpubrawblock` and `-zmqpubrawtx` with
+the format `-zmqpubrawtx=unix:/path/to/file`
+
+- Additional flags "in" and "out" have been added to `-whitelist` to control whether
+  permissions apply to incoming connections and/or manual (default: incoming only).
+
+- 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)
+
+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
+  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
+  (#29873). These restrictions simplify the assessment of incentive compatibility of accepting or
+  replacing TRUC transactions, thus ensuring any replacements are more profitable for the node and
+  making fee-bumping more reliable.
+
+- Pay To Anchor (P2A) is a new standard witness output type for spending,
+  a newly recognised output template. This allows for key-less anchor
+  outputs, with compact spending conditions for additional efficiencies on
+  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.
+
+- 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.
+
+- `mempoolfullrbf=1` is now set by default.
+
+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.
+
+- 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 `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.
+
+- 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.
+
+- 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)
+
+- `maxfeerate` and `maxburnamount` arguments are added to submitpackage.
+
+Changes to wallet related RPCs can be found in the Wallet section below.
+
+New RPCs
+--------
+
+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)
+
+Build System
+------------
+
+- GCC 11.1 or later, or Clang 16.0 or later,
+are now required to compile Bitcoin Core.
+
+- 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.
+
+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)
+
+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.
+
+- 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.
+
+- 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 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.
+
+- 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.
+
+- 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.
+
+GUI changes
+-----------
+
+- The "Migrate Wallet" menu allows users to migrate any legacy wallet in their wallet
+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
+=================
+
+RPC
+---
+
+Tests
+-----
+
+- The BIP94 timewarp attack mitigation is now active on the `regtest` network
+
+- `-testdatadir` is added to `test_bitcoin` to allow specifying the location for unit test data directories.
+
+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.
+
+Credits
+=======
+
+Thanks to everyone who directly contributed to this release:
+- 0xb10c
+- Alfonso Roman Zubeldia
+- Andrew Toth
+- AngusP
+- Anthony Towns
+- Antoine Poinsot
+- Anton A
+- Ava Chow
+- Ayush Singh
+- Ben Westgate
+- Brandon Odiwuor
+- brunoerg
+- bstin
+- Charlie
+- Christopher Bergqvist
+- Cory Fields
+- crazeteam
+- Daniela Brozzoni
+- David Gumberg
+- dergoegge
+- Edil Medeiros
+- Epic Curious
+- Fabian Jahr
+- fanquake
+- furszy
+- glozow
+- Greg Sanders
+- hanmz
+- Hennadii Stepanov
+- Hernan Marino
+- Hodlinator
+- ishaanam
+- ismaelsadeeq
+- Jadi
+- Jon Atack
+- josibake
+- jrakibi
+- kevkevin
+- kevkevinpal
+- Konstantin Akimov
+- laanwj
+- Larry Ruane
+- Lőrinc
+- Luis Schwab
+- Luke Dashjr
+- MarcoFalke
+- marcofleon
+- Marnix
+- Martin Saposnic
+- Martin Zumsande
+- Matt Corallo
+- Matthew Zipkin
+- Matt Whitlock
+- Max Edwards
+- Michael Dietz
+- Murch
+- nanlour
+- pablomartin4btc
+- Peter Todd
+- Pieter Wuille
+- @RandyMcMillan
+- RoboSchmied
+- Roman Zeyde
+- Ryan Ofsky
+- Sebastian Falbesoner
+- Sergi Delgado Segura
+- Sjors Provoost
+- spicyzboss
+- StevenMia
+- stickies-v
+- stratospher
+- Suhas Daftuar
+- sunerok
+- tdb3
+- TheCharlatan
+- umiumi
+- Vasil Dimov
+- virtu
+- willcl-ark
+
+As well as to everyone that helped with translations on
+[Transifex](https://www.transifex.com/bitcoin/bitcoin/).