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(note: this is a temporary file, to be added-to by anybody, and moved to
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release-notes at release time)
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Bitcoin Core version *version* is now available from:
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<https://bitcoin.org/bin/bitcoin-core-*version*/>
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This is a new major version release, including new features, various bugfixes
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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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==============
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If you are running an older version, shut it down. Wait until it has completely
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shut down (which might take a few minutes for older versions), then run the
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installer (on Windows) or just copy over `/Applications/Bitcoin-Qt` (on Mac)
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or `bitcoind`/`bitcoin-qt` (on Linux).
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The first time you run version 0.15.0, your chainstate database will be converted to a
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new format, which will take anywhere from a few minutes to half an hour,
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depending on the speed of your machine.
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Note that the block database format also changed in version 0.8.0 and there is no
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automatic upgrade code from before version 0.8 to version 0.15.0. Upgrading
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directly from 0.7.x and earlier without redownloading the blockchain is not supported.
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However, as usual, old wallet versions are still supported.
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Downgrading warning
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-------------------
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The chainstate database for this release is not compatible with previous
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releases, so if you run 0.15 and then decide to switch back to any
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older version, you will need to run the old release with the `-reindex-chainstate`
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option to rebuild the chainstate data structures in the old format.
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If your node has pruning enabled, this will entail re-downloading and
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processing the entire blockchain.
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Compatibility
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==============
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Bitcoin Core is extensively tested on multiple operating systems using
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the Linux kernel, macOS 10.8+, and Windows Vista and later. Windows XP is not supported.
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Bitcoin Core should also work on most other Unix-like systems but is not
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frequently tested on them.
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Notable changes
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===============
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GCC 4.8.x
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--------------
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The minimum version of GCC required to compile Bitcoin Core is now 4.8. No effort will be
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made to support older versions of GCC. See discussion in issue #11732 for more information.
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HD-wallets by default
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---------------------
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Due to a backward-incompatible change in the wallet database, wallets created
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with version 0.16.0 will be rejected by previous versions. Also, version 0.16.0
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will only create hierarchical deterministic (HD) wallets.
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Replace-By-Fee by default in GUI
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--------------------------------
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The send screen now uses BIP-125 RBF by default, regardless of `-walletrbf`.
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There is a checkbox to mark the transaction as final.
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The RPC default remains unchanged: to use RBF, launch with `-walletrbf=1` or
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use the `replaceable` argument for individual transactions.
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Wallets directory configuration (`-walletdir`)
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----------------------------------------------
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Bitcoin Core now has more flexibility in where the wallets directory can be
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located. Previously wallet database files were stored at the top level of the
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bitcoin data directory. The behavior is now:
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- For new installations (where the data directory doesn't already exist),
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wallets will now be stored in a new `wallets/` subdirectory inside the data
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directory by default.
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- For existing nodes (where the data directory already exists), wallets will be
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stored in the data directory root by default. If a `wallets/` subdirectory
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already exists in the data directory root, then wallets will be stored in the
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`wallets/` subdirectory by default.
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- The location of the wallets directory can be overridden by specifying a
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`-walletdir=<path>` option where `<path>` can be an absolute path to a
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directory or directory symlink.
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Care should be taken when choosing the wallets directory location, as if it
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becomes unavailable during operation, funds may be lost.
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Low-level RPC changes
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----------------------
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- The deprecated RPC `getinfo` was removed. It is recommended that the more specific RPCs are used:
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* `getblockchaininfo`
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* `getnetworkinfo`
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* `getwalletinfo`
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* `getmininginfo`
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- The wallet RPC `getreceivedbyaddress` will return an error if called with an address not in the wallet.
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- The wallet RPC `addwitnessaddress` was deprecated and will be removed in version 0.17,
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set the `address_type` argument of `getnewaddress`, or option `-addresstype=[bech32|p2sh-segwit]` instead.
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Changed command-line options
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-----------------------------
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- `-debuglogfile=<file>` can be used to specify an alternative debug logging file.
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Renamed script for creating JSON-RPC credentials
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-----------------------------
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The `share/rpcuser/rpcuser.py` script was renamed to `share/rpcauth/rpcauth.py`. This script can be
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used to create `rpcauth` credentials for a JSON-RPC user.
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- `dumpwallet` now includes hex-encoded scripts from the wallet in the dumpfile, and
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`importwallet` now imports these scripts, but corresponding addresses may not be added
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correctly or a manual rescan may be required to find relevant transactions.
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Credits
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=======
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Thanks to everyone who directly contributed to this release:
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As well as everyone that helped translating on [Transifex](https://www.transifex.com/projects/p/bitcoin/).
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