Bitcoin Core version 0.11.2 is now available from:
This is a new minor version release, bringing bug fixes, the BIP65
(CLTV) consensus change, and relay policy preparation for BIP113. It is
recommended to upgrade to this version as soon as possible.
Please report bugs using the issue tracker at github:
Upgrading and downgrading
How to Upgrade
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).
Because release 0.10.0 and later makes use of headers-first synchronization and
parallel block download (see further), the block files and databases are not
backwards-compatible with pre-0.10 versions of Bitcoin Core or other software:
Blocks will be stored on disk out of order (in the order they are
received, really), which makes it incompatible with some tools or
other programs. Reindexing using earlier versions will also not work
anymore as a result of this.
The block index database will now hold headers for which no block is
stored on disk, which earlier versions won’t support.
If you want to be able to downgrade smoothly, make a backup of your entire data
directory. Without this your node will need start syncing (or importing from
bootstrap.dat) anew afterwards. It is possible that the data from a completely
synchronised 0.10 node may be usable in older versions as-is, but this is not
supported and may break as soon as the older version attempts to reindex.
This does not affect wallet forward or backward compatibility. There are no
known problems when downgrading from 0.11.x to 0.10.x.
Notable changes since 0.11.1
BIP65 soft fork to enforce OP_CHECKLOCKTIMEVERIFY opcode
This release includes several changes related to the BIP65 soft fork
which redefines the existing OP_NOP2 opcode as OP_CHECKLOCKTIMEVERIFY
(CLTV) so that a transaction output can be made unspendable until a
specified point in the future.
This release will only relay and mine transactions spending a CLTV
output if they comply with the BIP65 rules as provided in code.
This release will produce version 4 blocks by default. Please see the
notice to miners below.
Once 951 out of a sequence of 1,001 blocks on the local node’s best block
chain contain version 4 (or higher) blocks, this release will no
longer accept new version 3 blocks and it will only accept version 4
blocks if they comply with the BIP65 rules for CLTV.
For more information about the soft-forking change, please see
Graphs showing the progress towards block version 4 adoption may be
found at the URLs below:
Notice to miners: Bitcoin Core’s block templates are now for
version 4 blocks only, and any mining software relying on its
getblocktemplate must be updated in parallel to use libblkmaker either
version 0.4.3 or any version from 0.5.2 onward.
If you are solo mining, this will affect you the moment you upgrade
Bitcoin Core, which must be done prior to BIP65 achieving its 951/1001
If you are mining with the stratum mining protocol: this does not
If you are mining with the getblocktemplate protocol to a pool: this
will affect you at the pool operator’s discretion, which must be no
later than BIP65 achieving its 951/1001 status.
Bitcoin transactions currently may specify a locktime indicating when
they may be added to a valid block. Current consensus rules require
that blocks have a block header time greater than the locktime specified
in any transaction in that block.
Miners get to choose what time they use for their header time, with the
consensus rule being that no node will accept a block whose time is more
than two hours in the future. This creates a incentive for miners to
set their header times to future values in order to include locktimed
transactions which weren’t supposed to be included for up to two more
The consensus rules also specify that valid blocks may have a header
time greater than that of the median of the 11 previous blocks. This
GetMedianTimePast() time has a key feature we generally associate with
time: it can’t go backwards.
BIP113 specifies a soft fork (not enforced in this release) that
weakens this perverse incentive for individual miners to use a future
time by requiring that valid blocks have a computed GetMedianTimePast()
greater than the locktime specified in any transaction in that block.
Mempool inclusion rules currently require transactions to be valid for
immediate inclusion in a block in order to be accepted into the mempool.
This release begins applying the BIP113 rule to received transactions,
so transaction whose time is greater than the GetMedianTimePast() will
no longer be accepted into the mempool.
Implication for miners: you will begin rejecting transactions that
would not be valid under BIP113, which will prevent you from producing
invalid blocks if/when BIP113 is enforced on the network. Any
transactions which are valid under the current rules but not yet valid
under the BIP113 rules will either be mined by other miners or delayed
until they are valid under BIP113. Note, however, that time-based
locktime transactions are more or less unseen on the network currently.
Implication for users: GetMedianTimePast() always trails behind the
current time, so a transaction locktime set to the present time will be
rejected by nodes running this release until the median time moves
forward. To compensate, subtract one hour (3,600 seconds) from your
locktimes to allow those transactions to be included in mempools at
approximately the expected time.
Windows bug fix for corrupted UTXO database on unclean shutdowns
Several Windows users reported that they often need to reindex the
entire blockchain after an unclean shutdown of Bitcoin Core on Windows
(or an unclean shutdown of Windows itself). Although unclean shutdowns
remain unsafe, this release no longer relies on memory-mapped files for
the UTXO database, which significantly reduced the frequency of unclean
shutdowns leading to required reindexes during testing.
For more information, see: https://github.com/bitcoin/bitcoin/pull/6917
Other fixes for database corruption on Windows are expected in the
next major release.
0.11.2 Change log
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.
684636b Make CScriptNum() take nMaxNumSize as an argument
4fa7a04 Replace NOP2 with CHECKLOCKTIMEVERIFY (BIP65)
6ea5ca4 Enable CHECKLOCKTIMEVERIFY as a standard script verify flag
5e82e1c Add CHECKLOCKTIMEVERIFY (BIP65) soft-fork logic
ba1da90 Show softfork status in getblockchaininfo
6af25b0 Add BIP65 to getblockchaininfo softforks list
01878c9 Fix locking in GetTransaction
b3eaa30 [Qt] Raise debug window when requested
1e672ae Debian/Ubuntu: Include bitcoin-tx binary
2394f4d Debian/Ubuntu: Split bitcoin-tx into its own package
33d6825 Bugfix: Allow mining on top of old tip blocks for testnet
21e58b8 build: make sure OpenSSL heeds noexecstack
95a5039 Set TCP_NODELAY on P2P sockets.
dfe55bd Do not allow blockfile pruning during reindex.
a1d3c6f Add rules–presently disabled–for using GetMedianTimePast as end point for lock-time calculations
f720c5f Enable policy enforcing GetMedianTimePast as the end point of lock-time constraints
0af5b8e leveldb: Win32WritableFile without memory mapping
4e895b0 Always flush block and undo when switching to new file
Thanks to everyone who directly contributed to this release:
- Alex Morcos
- Chris Kleeschulte
- Daniel Cousens
- Diego Viola
- Eric Lombrozo
- Esteban Ordano
- Gregory Maxwell
- Luke Dashjr
- Marco Falke
- Mark Friedenbach
- Matt Corallo
- Mitchell Cash
- Peter Todd
- Pieter Wuille
- Wladimir J. van der Laan
- Zak Wilcox
And those who contributed additional code review and/or security research.
As well as everyone that helped translating on Transifex.