Compatibility

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This is a new major version release, including new features, various bugfixes and performance improvements, as well as updated translations. If you are running an older version, shut it down. The first time you run version 0. Note that the block database format also changed in version 0. Upgrading directly from 0. However, as usual, old wallet versions are still supported.

Wallets created in 0. Existing wallets that were created with older versions are not affected by this. Bitcoin Core is extensively tested on multiple operating systems using the Linux kernel, macOS Windows XP is not supported. Bitcoin Core should also work on most other Unix-like systems but is not frequently tested on them.

A new -addresstype argument has been added, which supports legacyp2sh-segwit defaultand bech32 addresses. It controls what kind of addresses are produced by getnewaddressgetaccountaddressand createmultisigaddress. A -changetype argument has also been added, with the same options, and by default equal to -addresstypeto control which kind of change is used.

Note that some RPCs do not yet support segwit addresses. Support for segwit in those RPCs will continue to be added in future versions. This is done to ensure the change output is as indistinguishable from the other outputs as possible in either case. This includes the ability to send to BIP addresses including non-v0 onesand generating these addresses including as default new addresses, see above. A checkbox has been added to the GUI to select whether a Bech32 address or P2SH-wrapped address should be generated when using segwit addresses.

Due to a backward-incompatible change in the wallet database, wallets created with version 0. Note that this only applies to new wallets; wallets made with previous versions will not be upgraded to be HD. There is a checkbox to mark the transaction as final.

The RPC default remains unchanged: Bitcoin Core now has more flexibility in where the wallets directory can be located. Previously wallet database files were stored at the top level of the bitcoin data directory. The behavior is now:. Care should be taken when choosing the wallets directory location, as if it becomes unavailable during operation, funds may be lost. No effort will be made to support older versions of GCC.

See discussion in issue for more information. The minimum version for the Clang compiler is still 3. This would allow pruned nodes to serve the most recent blocks. However, the current change does not yet include support for connecting to these pruned peers.

In previous versions they were enabled using the --enable-experimental-asm flag when building, but are now the default and no longer deemed experimental. A new RPC rescanblockchain has been added to manually invoke a blockchain rescan. The RPC supports start and end-height arguments for the rescan, and can be used in a multiwallet environment to rescan the blockchain at runtime.

Safe mode is a feature that disables a subset of RPC calls - mostly related to the wallet and sending - automatically in case certain problem conditions with the network are detected.

However, developers have come to regard these checks as not reliable enough to act on automatically. Even with safe mode disabled, they will still cause warnings in the warnings field of the getneworkinfo RPC and launch the -alertnotify command.

The value for embedded includes much of the information validateaddress would report if invoked directly on the embedded address. This is a replacement for the existing addresses field which reports the same information but encoded as P2PKH addressesrepresented in a more useful and less confusing way. The addresses field remains present for non-segwit addresses for backward compatibility. In particular, this means that invoking validateaddress on the output of getnewaddress will always report the pubkeyeven when the address type is P2SH-P2WPKH.

As well as everyone that helped translating on Transifex. Bitcoin Core version 0. Please report bugs using the issue tracker at GitHub: Downgrading warning Wallets created in 0. Compatibility Bitcoin Core is extensively tested on multiple operating systems using the Linux kernel, macOS This means that downgrading after creating a segwit address will work, as long as the wallet file is up to date. All segwit keys in the wallet get an implicit redeemscript added, without it being written to the file.

This means recovery of an old backup will work, as long as you use new software. All keypool keys that are seen used in transactions explicitly get their redeemscripts added to the wallet files. This means that downgrading after recovering from a backup that includes a segwit address will work Note that some RPCs do not yet support segwit addresses.

HD-wallets by default Due to a backward-incompatible change in the wallet database, wallets created with version 0. Wallets directory configuration -walletdir Bitcoin Core now has more flexibility in where the wallets directory can be located. The behavior is now: For existing nodes where the data directory already existswallets will be stored in the data directory root by default.

Minimum GCC bumped to 4. The option to reuse a previous address has now been removed. Support for searching by TXID has been added, rather than just address and label. A toggle for unblinding the password fields on the password dialog has been added.

Validateaddress improvements The validateaddress RPC output has been extended with a few new fields, and support for segwit addresses both P2SH and Bech Low-level changes The deprecated RPC getinfo was removed. It is recommended that the more specific RPCs are used: The wallet RPC addwitnessaddress was deprecated and will be removed in version 0. The RPC getblockchaininfo now includes an errors field. A new blockhash parameter has been added to the getrawtransaction RPC which allows for a raw transaction to be fetched from a specific block if known, even without -txindex enabled.

The decoderawtransaction and fundrawtransaction RPCs now have optional iswitness parameters to override the heuristic witness checks if necessary.

Using addresses with the createmultisig RPC is now deprecated, and will be removed in a later version. Public keys should be used instead. The logging RPC has now been made public rather than hidden. An initialblockdownload boolean has been added to the getblockchaininfo RPC to indicate whether the node is currently in IBD or not. The -usehd option has been removed. Segwit is now always active in regtest mode by default. Failure to do this will result in a CheckBlockIndex assertion failure that will look like: Open files read only if requested Elbandi 46d1ebf Document partial validation in ConnectBlock sdaftuar c Make all script validation flags backward compatible sipa f Add a CChainState class to validation.

Options benma 9d31ed2 Split resolve out of connect theuni fef65c4 Ignore getheaders requests for very old side blocks jimpo 5aeaa9c addrman: Add missing lock in Clear CAddrMan practicalswift 5ef3b69 De-duplicate connection eviction logic tjps 1ff Do not send potentially invalid headers in response to getheaders TheBlueMatt aca77a4 Assert state.

Reject arguments to -getinfo laanwj da3 Fix sendrawtransaction hang when sending a tx already in mempool TheBlueMatt 32c9b57 clarify abortrescan rpc use instagibbs ef14f2e Improve help text and behavior of RPC-logging AkioNak 9e38d35 getblockchaininfo: Loop through the bip9 soft fork deployments instead of hard coding achow d0e0 Allow fetching tx directly from specified block in getrawtransaction kallewoof fee Add iswitness parameter to decode- and fundrawtransaction RPCs MeshCollider d16c Add scripts to dumpwallet RPC MeshCollider 9bad8d6 mempoolinfo should take:: Join worker threads before deleting work queue laanwj a41e Bech32 addresses in dumpwallet fivepiece ac1 Make signrawtransaction accept P2SH-P2WSH redeemscripts sipa GUI 64e66bb Pass SendCoinsRecipient bytes by reference practicalswift 5b8af7b Make tabs toolbar no longer have a context menu achow 9c8f Fix typo and access key in optionsdialog.

Poll ShutdownTimer after init is done MarcoFalke daaae36 qt: Make sure splash screen is freed on AppInitMain fail laanwj ad10b90 shutdown: Build with —enable-werror under OS X practicalswift df8c build: Fix Automake warnings when running autogen. Minor fixes and clean-ups fanquake 90d Remove unused variables practicalswift 52f travis: Revert default datadir check MarcoFalke f4ed44a Add a lint check for trailing whitespace MeshCollider 4ce2f3d mininode: Full clone for git subtree check MarcoFalke Documentation Fix inconsistencies and grammar in various files MeshCollider 7db65c3 Add a comment on the use of prevector in script gmaxwell cf Fix Markdown formatting issues in init.

Use testnet RequireStandard for -acceptnonstdtxn default luke-jr 4b65fa5 Comments: Documentation fixes for CVectorWriter ctors danra b Docs: Fix currency unit string in the help text AkioNak 21e2f2f Update developer notes with RPC response guidelines promag bcc8a62 explain how to recompile a modified unit test Sjors f Create dependencies.

Compile with -Wthread-safety-analysis if available practicalswift 0dec4cc Refactor: GetAncestor overloads danra 0ee8 crypto: Load references const ryanofsky Remove unused fQuit var from checkqueue.

Fix launchctl not being able to stop bitcoind OmeGak 6e4e98e Perform a weaker subtree check in Travis sipa [build] Add a script for installing db4 jamesob dd Prefix leveldb debug logging laanwj 24df9af Add -debuglogfile option laanwj c17f11f Shell script cleanups practicalswift a1f Test datadir specified in conf file exists MeshCollider dd Rename rpcuser.

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This is a new minor version release, including activation parameters for the segwit softfork, various bugfixes and performance improvements, as well as updated translations. This means that not even critical security updates will be released anymore. Without security updates, using a bitcoin wallet on a XP machine is irresponsible at least. In addition to that, with 0. It is not clear what the source of these crashes is, but it is likely that upstream libraries such as Qt are no longer being tested on XP.

We do not have time nor resources to provide support for an OS that is end-of-life. Users are suggested to upgrade to a newer version of Windows, or install an alternative OS that is supported. No attempt is made to prevent installing or running the software on Windows XP, you can still do so at your own risk, but do not expect it to work: Segregated witness segwit is a soft fork that, if activated, will allow transaction-producing software to separate segregate transaction signatures witnesses from the part of the data in a transaction that is covered by the txid.

This provides several immediate benefits:. Elimination of unwanted transaction malleability: Segregating the witness allows both existing and upgraded software to calculate the transaction identifier txid of transactions without referencing the witness, which can sometimes be changed by third-parties such as miners or by co-signers in a multisig spend. This solves all known cases of unwanted transaction malleability, which is a problem that makes programming Bitcoin wallet software more difficult and which seriously complicates the design of smart contracts for Bitcoin.

Segwit transactions contain new fields that are not part of the data currently used to calculate the size of a block, which allows a block containing segwit transactions to hold more data than allowed by the current maximum block size. The network will also be able to support more of the advanced-style payments such as multisig than it can support now because of the different weighting given to different parts of a transaction after segwit activates see the following section for details.

Weighting data based on how it affects node performance: Some parts of each Bitcoin block need to be stored by nodes in order to validate future blocks; other parts of a block can be immediately forgotten pruned or used only for helping other nodes sync their copy of the block chain.

Specifically, each byte of a segregated witness is given a weight of 1, each other byte in a block is given a weight of 4, and the maximum allowed weight of a block is 4 million. Weighting the data this way better aligns the most profitable strategy for creating blocks with the long-term costs of block validation.

A simple improvement in the way signatures are generated in segwit simplifies the design of secure signature generators such as hardware wallets , reduces the amount of data the signature generator needs to download, and allows the signature generator to operate more quickly. This is made possible by having the generator sign the amount of bitcoins they think they are spending, and by having full nodes refuse to accept those signatures unless the amount of bitcoins being spent is exactly the same as was signed.

For non-segwit transactions, wallets instead had to download the complete previous transactions being spent for every payment they made, which could be a slow operation on hardware wallets and in other situations where bandwidth or computation speed was constrained. Linear scaling of sighash operations: In a block was produced that required about 25 seconds to validate on modern hardware because of the way transaction signature hashes are performed.

Other similar blocks, or blocks that could take even longer to validate, can still be produced today. Increased security for multisig: For P2PKH addresses, this provides about bits of security—which is beyond what cryptographers believe can be broken today. But because P2SH is more flexible, only about 80 bits of security is provided per address. Although 80 bits is very strong security, it is within the realm of possibility that it can be broken by a powerful adversary.

Segwit enables this capability at the consensus layer, but note that Bitcoin Core does not provide an option to use this capability as of this 0.

Segwit makes it easy for future soft forks to allow Bitcoin users to individually opt-in to almost any change in the Bitcoin Script language when those users receive new transactions. Features currently being researched by Bitcoin Core contributors that may use this capability include support for Schnorr signatures, which can improve the privacy and efficiency of multisig transactions or transactions with multiple inputs , and Merklized Abstract Syntax Trees MAST , which can improve the privacy and efficiency of scripts with two or more conditions.

Other Bitcoin community members are studying several other improvements that can be made using script versioning. Activation for the segwit soft fork is being managed using BIP9 versionbits. After another 2, blocks, segwit will activate. For more information about segwit, please see the segwit FAQ , the segwit wallet developers guide or BIPs , , , and Combined with the segwit soft fork is an additional change that turns a long-existing network relay policy into a consensus rule.

The dummy element is not inspected in any manner, and could be replaced by any value without invalidating the script. Since Bitcoin Core 0. The null dummy soft fork turns this relay rule into a consensus rule both for non-segwit transactions and segwit transactions, so that this method of mutating transactions is permanently eliminated from the network.

Signaling for the null dummy soft fork is done by signaling support for segwit, and the null dummy soft fork will activate at the same time as segwit. For more information, please see BIP Additional detail on the ARM architecture targeted by each is provided below.

ARM builds are still experimental. If you have problems on a certain device or Linux distribution combination please report them on the bug tracker, it may be possible to resolve them.

Note that the device you use must be backward compatible with the architecture targeted by the binary that you use.

The executables are not expected to work out of the box on Android. Detailed release notes follow. This overview includes changes that affect behavior, not code moves, refactors and string updates. For convenience in locating the code changes and accompanying discussion, both the pull request and git merge commit are mentioned. As well as everyone that helped translating on Transifex. Bitcoin Core version 0. Please report bugs using the issue tracker at github: Notable changes Segregated witness soft fork Segregated witness segwit is a soft fork that, if activated, will allow transaction-producing software to separate segregate transaction signatures witnesses from the part of the data in a transaction that is covered by the txid.

This provides several immediate benefits: Null dummy soft fork Combined with the segwit soft fork is an additional change that turns a long-existing network relay policy into a consensus rule. Low-level RPC changes importprunedfunds only accepts two required arguments. Some versions accept an optional third arg, which was always ignored.

Make sure to never pass more than two arguments. Linux ARM builds With the 0. The following extra files can be found in the download directory or torrent: Linux binaries targeting the bit ARMv7-A architecture. Linux binaries targeting the bit ARMv8-A architecture. Update and fix formatting of help luke-jr Block and transaction handling aca Reduce default number of blocks to check at startup sipa 3e80ab7 Add policy: Switch to dumb dbm MarcoFalke dd nulldummy.

Mention curl MarcoFalke b09e13c build,doc: Check for untranslated substitution MarcoFalke Credits Thanks to everyone who directly contributed to this release: