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| *After branching off for a major version release of Bitcoin Core, use this | ||
| template to create the initial release notes draft.* | ||
| Please edit the release notes here: | ||
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| *The release notes draft is a temporary file that can be added to by anyone. See | ||
| [/doc/developer-notes.md#release-notes](/doc/developer-notes.md#release-notes) | ||
| for the process.* | ||
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| *Create the draft, named* "*version* Release Notes Draft" | ||
| *(e.g. "0.20.0 Release Notes Draft"), as a collaborative wiki in:* | ||
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| https://github.com/bitcoin-core/bitcoin-devwiki/wiki/ | ||
| https://github.com/bitcoin-core/bitcoin-devwiki/wiki/0.20.0-Release-Notes-Draft | ||
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| *Before the final release, move the notes back to this git repository.* | ||
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| *version* Release Notes Draft | ||
| =============================== | ||
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| Bitcoin Core version *version* is now available from: | ||
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| <https://bitcoincore.org/bin/bitcoin-core-*version*/> | ||
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| This release includes new features, various bug fixes and performance | ||
| improvements, as well as updated translations. | ||
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| Please report bugs using the issue tracker at GitHub: | ||
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| <https://github.com/bitcoin/bitcoin/issues> | ||
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| To receive security and update notifications, please subscribe to: | ||
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| <https://bitcoincore.org/en/list/announcements/join/> | ||
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| How to Upgrade | ||
| ============== | ||
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| If you are running an older version, shut it down. Wait until it has completely | ||
| shut down (which might take a few minutes for older versions), then run the | ||
| installer (on Windows) or just copy over `/Applications/Bitcoin-Qt` (on Mac) | ||
| or `bitcoind`/`bitcoin-qt` (on Linux). | ||
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| Upgrading directly from a version of Bitcoin Core that has reached its EOL is | ||
| possible, but it might take some time if the datadir needs to be migrated. Old | ||
| wallet versions of Bitcoin Core are generally supported. | ||
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| Compatibility | ||
| ============== | ||
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| Bitcoin Core is supported and extensively tested on operating systems using | ||
| the Linux kernel, macOS 10.12+, and Windows 7 and newer. It is not recommended | ||
| to use Bitcoin Core on unsupported systems. | ||
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| Bitcoin Core should also work on most other Unix-like systems but is not | ||
| as frequently tested on them. | ||
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| From Bitcoin Core 0.20.0 onwards, macOS versions earlier than 10.12 are no | ||
| longer supported. Additionally, Bitcoin Core does not yet change appearance | ||
| when macOS "dark mode" is activated. | ||
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| In addition to previously supported CPU platforms, this release's pre-compiled | ||
| distribution provides binaries for the RISC-V platform. | ||
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| Notable changes | ||
| =============== | ||
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| P2P and network changes | ||
| ----------------------- | ||
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| #### Removal of reject network messages from Bitcoin Core (BIP61) | ||
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| The command line option to enable BIP61 (`-enablebip61`) has been removed. | ||
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| This feature has been disabled by default since Bitcoin Core version 0.18.0. | ||
| Nodes on the network can not generally be trusted to send valid ("reject") | ||
| messages, so this should only ever be used when connected to a trusted node. | ||
| Please use the recommended alternatives if you rely on this deprecated feature: | ||
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| * Testing or debugging of implementations of the Bitcoin P2P network protocol | ||
| should be done by inspecting the log messages that are produced by a recent | ||
| version of Bitcoin Core. Bitcoin Core logs debug messages | ||
| (`-debug=<category>`) to a stream (`-printtoconsole`) or to a file | ||
| (`-debuglogfile=<debug.log>`). | ||
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| * Testing the validity of a block can be achieved by specific RPCs: | ||
| - `submitblock` | ||
| - `getblocktemplate` with `'mode'` set to `'proposal'` for blocks with | ||
| potentially invalid POW | ||
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| * Testing the validity of a transaction can be achieved by specific RPCs: | ||
| - `sendrawtransaction` | ||
| - `testmempoolaccept` | ||
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| * Wallets should not use the absence of "reject" messages to indicate a | ||
| transaction has propagated the network, nor should wallets use "reject" | ||
| messages to set transaction fees. Wallets should rather use fee estimation | ||
| to determine transaction fees and set replace-by-fee if desired. Thus, they | ||
| could wait until the transaction has confirmed (taking into account the fee | ||
| target they set (compare the RPC `estimatesmartfee`)) or listen for the | ||
| transaction announcement by other network peers to check for propagation. | ||
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| The removal of BIP61 REJECT message support also has the following minor RPC | ||
| and logging implications: | ||
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| * `testmempoolaccept` and `sendrawtransaction` no longer return the P2P REJECT | ||
| code when a transaction is not accepted to the mempool. They still return the | ||
| verbal reject reason. | ||
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| * Log messages that previously reported the REJECT code when a transaction was | ||
| not accepted to the mempool now no longer report the REJECT code. The reason | ||
| for rejection is still reported. | ||
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| Updated RPCs | ||
| ------------ | ||
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| - `testmempoolaccept` and `sendrawtransaction` no longer return the P2P REJECT | ||
| code when a transaction is not accepted to the mempool. See the Section | ||
| _Removal of reject network messages from Bitcoin Core (BIP61)_ for details on | ||
| the removal of BIP61 REJECT message support. | ||
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| - A new descriptor type `sortedmulti(...)` has been added to support multisig scripts where the public keys are sorted lexicographically in the resulting script. | ||
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| - `walletprocesspsbt` and `walletcreatefundedpsbt` now include BIP 32 derivation paths by default for public keys if we know them. This can be disabled by setting `bip32derivs` to `false`. | ||
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| Build System | ||
| ------------ | ||
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| - OpenSSL is no longer used by Bitcoin Core. The last usage of the library | ||
| was removed in #17265. | ||
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| - glibc 2.17 or greater is now required to run the release binaries. This | ||
| retains compatibility with RHEL 7, CentOS 7, Debian 8 and Ubuntu 14.04 LTS. | ||
| Further details can be found in #17538. | ||
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| New RPCs | ||
| -------- | ||
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| New settings | ||
| ------------ | ||
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| - RPC Whitelist system. It can give certain RPC users permissions to only some RPC calls. | ||
| It can be set with two command line arguments (`rpcwhitelist` and `rpcwhitelistdefault`). (#12763) | ||
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| - A new `-asmap` configuration option has been added to enable IP-to-ASN mapping | ||
| for bucketing of the network peers to diversify the network connections. The | ||
| legacy /16 prefix mapping remains the default. See [issue | ||
| #16599](https://github.com/bitcoin/bitcoin/issues/16599), [PR | ||
| #16702](https://github.com/bitcoin/bitcoin/pull/16702), and the `bitcoind | ||
| help` for more information. This option is experimental and subject to changes | ||
| or removal in future releases. | ||
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| Updated settings | ||
| ---------------- | ||
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| Importing blocks upon startup via the `bootstrap.dat` file no longer occurs by default. The file must now be specified with `-loadblock=<file>`. | ||
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| - The `-debug=db` logging category has been renamed to `-debug=walletdb`, to distinguish it from `coindb`. | ||
| `-debug=db` has been deprecated and will be removed in the next major release. | ||
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| GUI changes | ||
| ----------- | ||
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| - The "Start Bitcoin Core on system login" option has been removed on macOS. | ||
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| Wallet | ||
| ------ | ||
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| - The wallet now by default uses bech32 addresses when using RPC, and creates native segwit change outputs. | ||
| - The way that output trust was computed has been fixed in #16766, which impacts confirmed/unconfirmed balance status and coin selection. | ||
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| - The RPC gettransaction, listtransactions and listsinceblock responses now also | ||
| includes the height of the block that contains the wallet transaction, if any. | ||
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| - RPC `getaddressinfo` changes: | ||
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| - the `label` field has been deprecated in favor of the `labels` field and | ||
| will be removed in 0.21. It can be re-enabled in the interim by launching | ||
| with `-deprecatedrpc=label`. | ||
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| - the `labels` behavior of returning an array of JSON objects containing name | ||
| and purpose key/value pairs has been deprecated in favor of an array of | ||
| label names and will be removed in 0.21. The previous behavior can be | ||
| re-enabled in the interim by launching with `-deprecatedrpc=labelspurpose`. | ||
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| Low-level changes | ||
| ================= | ||
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| Command line | ||
| ------------ | ||
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| Command line options prefixed with main/test/regtest network names like | ||
| `-main.port=8333` `-test.server=1` previously were allowed but ignored. Now | ||
| they trigger "Invalid parameter" errors on startup. | ||
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| Tests | ||
| ----- | ||
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| - It is now an error to use an unqualified `walletdir=path` setting in the config file if running on testnet or regtest | ||
| networks. The setting now needs to be qualified as `chain.walletdir=path` or placed in the appropriate `[chain]` | ||
| section. (#17447) | ||
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| - `-fallbackfee` was 0 (disabled) by default for the main chain, but 0.0002 by default for the test chains. Now it is 0 | ||
| by default for all chains. Testnet and regtest users will have to add `fallbackfee=0.0002` to their configuration if | ||
| they weren't setting it and they want it to keep working like before. (#16524) | ||
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| Credits | ||
| ======= | ||
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| Thanks to everyone who directly contributed to this release: | ||
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| As well as to everyone that helped with translations on | ||
| [Transifex](https://www.transifex.com/bitcoin/bitcoin/). |