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Merge #1283: Bitcoin Core 0.12.1
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Wladimir J. van der Laan
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_releases/v0.12.1.md
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_releases/v0.12.1.md
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---
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# This file is licensed under the MIT License (MIT) available on
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# http://opensource.org/licenses/MIT.
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# Text originally from Bitcoin Core project
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# Metadata and small formatting changes from Bitcoin.org project
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## Required value below populates the %v variable (note: % needs to be escaped in YAML if it starts a value)
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required_version: 0.12.1
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## Required title.
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title: Bitcoin Core version 0.12.1 released
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## Optional release date. May be filled in hours/days after a release
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optional_date: 2016-04-15
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## Optional magnet link. To get it, open the torrent in a good BitTorrent client
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## and View Details, or install the transmission-cli Debian/Ubuntu package
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## and run: transmission-show -m <torrent file>
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#
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## Link should be enclosed in quotes and start with: "magnet:?
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optional_magnetlink: "magnet:?xt=urn:btih:25c4df2a822e840e972a50a31095632d87efadab&dn=bitcoin-core-0.12.1&tr=udp%3A%2F%2Ftracker.openbittorrent.com%3A80%2Fannounce&tr=udp%3A%2F%2Ftracker.publicbt.com%3A80%2Fannounce&tr=udp%3A%2F%2Ftracker.ccc.de%3A80%2Fannounce&tr=udp%3A%2F%2Ftracker.coppersurfer.tk%3A6969&tr=udp%3A%2F%2Ftracker.leechers-paradise.org%3A6969&ws=https%3A%2F%2Fbitcoin.org%2Fbin%2F"
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## The --- below ends the YAML header. After that, paste the release notes.
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## Warning: this site's Markdown parser commonly requires you make two
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## changes to the release notes from the Bitcoin Core source tree:
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##
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## 1. Make sure both ordered and unordered lists are preceeded by an empty
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## (whitespace only) line, like the empty line before this list item.
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##
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## 2. Place URLs inside angle brackets, like <http://bitcoin.org/bin>
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---
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{% githubify https://github.com/bitcoin/bitcoin %}
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Bitcoin Core version 0.12.1 is now available from:
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<https://bitcoin.org/bin/bitcoin-core-0.12.1/>
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This is a new minor version release, including the BIP9, BIP68 and BIP112
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softfork, various bugfixes and 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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Upgrading and downgrading
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=========================
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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) or
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bitcoind/bitcoin-qt (on Linux).
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Downgrade warning
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-----------------
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### Downgrade to a version < 0.12.0
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Because release 0.12.0 and later will obfuscate the chainstate on every
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fresh sync or reindex, the chainstate is not backwards-compatible with
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pre-0.12 versions of Bitcoin Core or other software.
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If you want to downgrade after you have done a reindex with 0.12.0 or later,
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you will need to reindex when you first start Bitcoin Core version 0.11 or
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earlier.
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Notable changes
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===============
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First version bits BIP9 softfork deployment
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-------------------------------------------
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This release includes a soft fork deployment to enforce [BIP68][],
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[BIP112][] and [BIP113][] using the [BIP9][] deployment mechanism.
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The deployment sets the block version number to 0x20000001 between
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midnight 1st May 2016 and midnight 1st May 2017 to signal readiness for
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deployment. The version number consists of 0x20000000 to indicate version
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bits together with setting bit 0 to indicate support for this combined
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deployment, shown as "csv" in the `getblockchaininfo` RPC call.
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For more information about the soft forking change, please see
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<https://github.com/bitcoin/bitcoin/pull/7648>
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This specific backport pull-request can be viewed at
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<https://github.com/bitcoin/bitcoin/pull/7543>
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[BIP9]: https://github.com/bitcoin/bips/blob/master/bip-0009.mediawiki
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[BIP68]: https://github.com/bitcoin/bips/blob/master/bip-0068.mediawiki
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[BIP112]: https://github.com/bitcoin/bips/blob/master/bip-0112.mediawiki
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[BIP113]: https://github.com/bitcoin/bips/blob/master/bip-0113.mediawiki
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BIP68 soft fork to enforce sequence locks for relative locktime
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---------------------------------------------------------------
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[BIP68][] introduces relative lock-time consensus-enforced semantics of
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the sequence number field to enable a signed transaction input to remain
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invalid for a defined period of time after confirmation of its corresponding
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outpoint.
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For more information about the implementation, see
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<https://github.com/bitcoin/bitcoin/pull/7184>
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BIP112 soft fork to enforce OP_CHECKSEQUENCEVERIFY
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--------------------------------------------------
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[BIP112][] redefines the existing OP_NOP3 as OP_CHECKSEQUENCEVERIFY (CSV)
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for a new opcode in the Bitcoin scripting system that in combination with
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[BIP68][] allows execution pathways of a script to be restricted based
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on the age of the output being spent.
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For more information about the implementation, see
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<https://github.com/bitcoin/bitcoin/pull/7524>
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BIP113 locktime enforcement soft fork
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-------------------------------------
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Bitcoin Core 0.11.2 previously introduced mempool-only locktime
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enforcement using GetMedianTimePast(). This release seeks to
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consensus enforce the rule.
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Bitcoin transactions currently may specify a locktime indicating when
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they may be added to a valid block. Current consensus rules require
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that blocks have a block header time greater than the locktime specified
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in any transaction in that block.
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Miners get to choose what time they use for their header time, with the
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consensus rule being that no node will accept a block whose time is more
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than two hours in the future. This creates a incentive for miners to
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set their header times to future values in order to include locktimed
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transactions which weren't supposed to be included for up to two more
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hours.
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The consensus rules also specify that valid blocks may have a header
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time greater than that of the median of the 11 previous blocks. This
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GetMedianTimePast() time has a key feature we generally associate with
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time: it can't go backwards.
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[BIP113][] specifies a soft fork enforced in this release that
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weakens this perverse incentive for individual miners to use a future
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time by requiring that valid blocks have a computed GetMedianTimePast()
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greater than the locktime specified in any transaction in that block.
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Mempool inclusion rules currently require transactions to be valid for
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immediate inclusion in a block in order to be accepted into the mempool.
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This release begins applying the BIP113 rule to received transactions,
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so transaction whose time is greater than the GetMedianTimePast() will
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no longer be accepted into the mempool.
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**Implication for miners:** you will begin rejecting transactions that
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would not be valid under BIP113, which will prevent you from producing
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invalid blocks when BIP113 is enforced on the network. Any
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transactions which are valid under the current rules but not yet valid
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under the BIP113 rules will either be mined by other miners or delayed
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until they are valid under BIP113. Note, however, that time-based
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locktime transactions are more or less unseen on the network currently.
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**Implication for users:** GetMedianTimePast() always trails behind the
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current time, so a transaction locktime set to the present time will be
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rejected by nodes running this release until the median time moves
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forward. To compensate, subtract one hour (3,600 seconds) from your
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locktimes to allow those transactions to be included in mempools at
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approximately the expected time.
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For more information about the implementation, see
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<https://github.com/bitcoin/bitcoin/pull/6566>
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Miscellaneous
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-------------
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The p2p alert system is off by default. To turn on, use `-alert` with
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startup configuration.
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0.12.1 Change log
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=================
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Detailed release notes follow. This overview includes changes that affect
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behavior, not code moves, refactors and string updates. For convenience in locating
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the code changes and accompanying discussion, both the pull request and
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git merge commit are mentioned.
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### RPC and other APIs
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- #7739 `7ffc2bd` Add abandoned status to listtransactions (jonasschnelli)
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### Block and transaction handling
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- #7543 `834aaef` Backport BIP9, BIP68 and BIP112 with softfork (btcdrak)
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### P2P protocol and network code
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- #7804 `90f1d24` Track block download times per individual block (sipa)
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- #7832 `4c3a00d` Reduce block timeout to 10 minutes (laanwj)
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### Validation
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- #7821 `4226aac` init: allow shutdown during 'Activating best chain...' (laanwj)
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- #7835 `46898e7` Version 2 transactions remain non-standard until CSV activates (sdaftuar)
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### Build system
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- #7487 `00d57b4` Workaround Travis-side CI issues (luke-jr)
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- #7606 `a10da9a` No need to set -L and --location for curl (MarcoFalke)
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- #7614 `ca8f160` Add curl to packages (now needed for depends) (luke-jr)
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- #7776 `a784675` Remove unnecessary executables from gitian release (laanwj)
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### Wallet
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- #7715 `19866c1` Fix calculation of balances and available coins. (morcos)
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### Miscellaneous
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- #7617 `f04f4fd` Fix markdown syntax and line terminate LogPrint (MarcoFalke)
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- #7747 `4d035bc` added depends cross compile info (accraze)
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- #7741 `a0cea89` Mark p2p alert system as deprecated (btcdrak)
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- #7780 `c5f94f6` Disable bad-chain alert (btcdrak)
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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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- accraze
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- Alex Morcos
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- BtcDrak
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- Jonas Schnelli
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- Luke Dashjr
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- MarcoFalke
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- Mark Friedenbach
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- NicolasDorier
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- Pieter Wuille
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- Suhas Daftuar
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- Wladimir J. van der Laan
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As well as everyone that helped translating on [Transifex](https://www.transifex.com/projects/p/bitcoin/).
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{% endgithubify %}
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