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Merge branch 'bitcoin-core-0.11.1'
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_releases/0.11.1.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: 0.11.1
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## Optional release date. May be filled in hours/days after a release
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#optional_date: 2015-07-12
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## Optional title. If not set, default is: Bitcoin Core version %v released
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optional_title: Bitcoin Core version %v released
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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:82f0d2fa100d6db8a8c1338768dcb9e4e524da13&dn=bitcoin-core-0.11.0&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%2Fopen.demonii.com%3A1337&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 0.11.1 is now available from:
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<https://bitcoin.org/bin/bitcoin-core-0.11.1/>
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This is a new minor version release, bringing security fixes. It is recommended
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to upgrade to this version as soon as possible.
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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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Because release 0.10.0 and later makes use of headers-first synchronization and
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parallel block download (see further), the block files and databases are not
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backwards-compatible with pre-0.10 versions of Bitcoin Core or other software:
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* Blocks will be stored on disk out of order (in the order they are
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received, really), which makes it incompatible with some tools or
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other programs. Reindexing using earlier versions will also not work
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anymore as a result of this.
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* The block index database will now hold headers for which no block is
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stored on disk, which earlier versions won't support.
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If you want to be able to downgrade smoothly, make a backup of your entire data
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directory. Without this your node will need start syncing (or importing from
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bootstrap.dat) anew afterwards. It is possible that the data from a completely
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synchronised 0.10 node may be usable in older versions as-is, but this is not
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supported and may break as soon as the older version attempts to reindex.
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This does not affect wallet forward or backward compatibility. There are no
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known problems when downgrading from 0.11.x to 0.10.x.
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Notable changes
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===============
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Fix buffer overflow in bundled upnp
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------------------------------------
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Bundled miniupnpc was updated to 1.9.20151008. This fixes a buffer overflow in
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the XML parser during initial network discovery.
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Details can be found here: http://talosintel.com/reports/TALOS-2015-0035/
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This applies to the distributed executables only, not when building from source or
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using distribution provided packages.
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Test for LowS signatures before relaying
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-----------------------------------------
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Make the node require the canonical 'low-s' encoding for ECDSA signatures when
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relaying or mining. This removes a nuisance malleability vector.
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Consensus behavior is unchanged.
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If widely deployed this change would eliminate the last remaining known vector
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for nuisance malleability on SIGHASH_ALL P2PKH transactions. On the down-side
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it will block most transactions made by sufficiently out of date software.
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Unlike the other avenues to change txids on transactions this
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one was randomly violated by all deployed bitcoin software prior to
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its discovery. So, while other malleability vectors where made
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non-standard as soon as they were discovered, this one has remained
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permitted. Even BIP62 did not propose applying this rule to
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old version transactions, but conforming implementations have become
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much more common since BIP62 was initially written.
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Bitcoin Core has produced compatible signatures since a28fb70e in
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September 2013, but this didn't make it into a release until 0.9
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in March 2014; Bitcoinj has done so for a similar span of time.
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Bitcoinjs and electrum have been more recently updated.
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This does not replace the need for BIP62 or similar, as miners can
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still cooperate to break transactions. Nor does it replace the
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need for wallet software to handle malleability sanely[1]. This
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only eliminates the cheap and irritating DOS attack.
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[1] On the Malleability of Bitcoin Transactions
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Marcin Andrychowicz, Stefan Dziembowski, Daniel Malinowski, Łukasz Mazurek
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http://fc15.ifca.ai/preproceedings/bitcoin/paper_9.pdf
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0.11.1 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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- #6438 `2531438` openssl: avoid config file load/race
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- #6439 `980f820` Updated URL location of netinstall for Debian
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- #6384 `8e5a969` qt: Force TLS1.0+ for SSL connections
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- #6471 `92401c2` Depends: bump to qt 5.5
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- #6224 `93b606a` Be even stricter in processing unrequested blocks
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- #6571 `100ac4e` libbitcoinconsensus: avoid a crash in multi-threaded environments
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- #6545 `649f5d9` Do not store more than 200 timedata samples.
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- #6694 `834e299` [QT] fix thin space word wrap line break issue
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- #6703 `1cd7952` Backport bugfixes to 0.11
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- #6750 `5ed8d0b` Recent rejects backport to v0.11
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- #6769 `71cc9d9` Test LowS in standardness, removes nuisance malleability vector.
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- #6789 `b4ad73f` Update miniupnpc to 1.9.20151008
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- #6785 `b4dc33e` Backport to v0.11: In (strCommand == "tx"), return if AlreadyHave()
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- #6412 `0095b9a` Test whether created sockets are select()able
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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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- Adam Weiss
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- Alex Morcos
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- Casey Rodarmor
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- Cory Fields
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- fanquake
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- Gregory Maxwell
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- Jonas Schnelli
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- J Ross Nicoll
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- Pavel Janík
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- Pavel Vasin
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- Peter Todd
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- Pieter Wuille
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- randy-waterhouse
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- Ross Nicoll
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- Suhas Daftuar
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- tailsjoin
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- ฿tcDrak
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- Tom Harding
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- Veres Lajos
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- Wladimir J. van der Laan
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And those who contributed additional code review and/or security research:
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- timothy on IRC for reporting the issue
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- Vulnerability in miniupnp discovered by Aleksandar Nikolic of Cisco Talos
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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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