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kevacoin/doc/release-notes.md

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Bitcoin Core version 0.13.1 is now available from:

https://bitcoin.org/bin/bitcoin-core-0.13.1/

This is a new major version release, including new features, various bugfixes and performance improvements, as well as updated translations.

Please report bugs using the issue tracker at github:

https://github.com/bitcoin/bitcoin/issues

To receive security and update notifications, please subscribe to:

https://bitcoincore.org/en/list/announcements/join/

Compatibility

Microsoft ended support for Windows XP on April 8th, 2014, an OS initially released in 2001. 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 0.12.x there have been varied reports of Bitcoin Core randomly crashing on Windows XP. 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. From 0.13.0 on, Windows XP is no longer supported. 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: do not report issues about Windows XP to the issue tracker.

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 rest of the data in a transaction, and to allow miners to place those witnesses outside of the traditional block structure. This provides two immediate benefits:

  • Elimination of malleability: Segregating the witness allows both existing software and upgraded software that receives transactions to calculate the transaction identifier (txid) of segwit-using transactions without referencing the witness. This solves all known cases of unwanted third-party 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.

  • Capacity increase: Moving witness data outside of the traditional block structure (but still inside a new-style block structure) means new-style blocks can hold more data than older-style blocks, allowing a modest increase to the amount of transaction data that can fit in a block.

Segwit also simplifies the ability to add new features to Bitcoin and improves the efficiency of full nodes, which will help provide long-term benefits to Bitcoin users.

Activation for the segwit soft fork is being managed using BIP9 versionbits. Segwit's version bit is bit 1, and nodes will begin tracking which blocks signal support for segwit at the beginning of the first retarget period after segwit's start date of 15 November 2016. If 95% of blocks within a 2,016-block retarget period (about two weeks) signal support for segwit, the soft fork will be locked in. After another 2,016 blocks, segwit will activate.

For more information about segwit, please see the segwit FAQ, the segwit wallet developers guide or BIPs 141, 143, 144, and 145. If you're a miner or mining pool operator, please see the versionbits FAQ for information about signaling support for a soft fork.

Null dummy soft fork

Combined with the segwit soft fork is a soft fork that turns a long-existing network relay policy into a consensus rule. The OP_CHECKMULTISIG and OP_CHECKMULTISIGVERIFY opcodes consume an extra stack element ("dummy element") after signature validation. The dummy element is not inspected in any manner, and could be replaced by any value without invalidating the script.

Because any value can be used for this dummy element, it's possible for a third-party to insert data into other people's transactions, changing the transaction's txid (called transaction malleability) and possibly causing other problems.

Since Bitcoin Core 0.10.0, nodes have defaulted to only relaying and mining transactions whose dummy element was a null value (0x00, also called OP_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 BIP147.

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.

0.13.1 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.

Consensus

  • #8636 9dfa0c8 Implement NULLDUMMY softfork (BIP147) (jl2012)
  • #8848 7a34a46 Add NULLDUMMY verify flag in bitcoinconsensus.h (jl2012)
  • #8937 8b66659 Define start and end time for segwit deployment (sipa)

RPC and other APIs

  • #8581 526d2b0 Drop misleading option in importprunedfunds (MarcoFalke)
  • #8699 a5ec248 Remove createwitnessaddress RPC command (jl2012)
  • #8780 794b007 Deprecate getinfo (MarcoFalke)
  • #8832 83ad563 Throw JSONRPCError when utxo set can not be read (MarcoFalke)
  • #8884 b987348 getblockchaininfo help: pruneheight is the lowest, not highest, block (luke-jr)

Block and transaction handling

  • #8611 a9429ca Reduce default number of blocks to check at startup (sipa)
  • #8634 3e80ab7 Add policy: null signature for failed CHECK(MULTI)SIG (jl2012)
  • #8525 1672225 Do not store witness txn in rejection cache (sipa)
  • #8499 9777fe1 Add several policy limits and disable uncompressed keys for segwit scripts (jl2012)
  • #8526 0027672 Make non-minimal OP_IF/NOTIF argument non-standard for P2WSH (jl2012)
  • #8524 b8c79a0 Precompute sighashes (sipa)
  • #8651 b8c79a0 Predeclare PrecomputedTransactionData as struct (sipa)

P2P protocol and network code

  • #8740 42ea51a No longer send local address in addrMe (laanwj)
  • #8427 69d1cd2 Ignore notfound P2P messages (laanwj)
  • #8573 4f84082 Set jonasschnellis dns-seeder filter flag (jonasschnelli)
  • #8712 23feab1 Remove maxuploadtargets recommended minimum (jonasschnelli)
  • #8862 7ae6242 Fix a few cases where messages were sent after requested disconnect (theuni)
  • #8393 fe1975a Support for compact blocks together with segwit (sipa)
  • #8282 2611ad7 Feeler connections to increase online addrs in the tried table (EthanHeilman)
  • #8612 2215c22 Check for compatibility with download in FindNextBlocksToDownload (sipa)
  • #8606 bbf379b Fix some locks (sipa)
  • #8594 ab295bb Do not add random inbound peers to addrman (gmaxwell)
  • #8940 5b4192b Add x9 service bit support to dnsseed.bluematt.me, seed.bitcoinstats.com (TheBlueMatt, cdecker)

Build system

  • #8293 fa5b249 Allow building libbitcoinconsensus without any univalue (luke-jr)
  • #8492 8b0bdd3 Allow building bench_bitcoin by itself (luke-jr)
  • #8563 147003c Add configure check for -latomic (ajtowns)
  • #8626 ea51b0f Berkeley DB v6 compatibility fix (netsafe)
  • #8520 75f2065 Remove check for openssl/ec.h (laanwj)

GUI

  • #8481 d9f0d4e Fix minimize and close bugs (adlawren)
  • #8487 a37cec5 Persist the datadir after option reset (achow101)
  • #8697 41fd852 Fix op order to append first alert (rodasmith)
  • #8678 8e03382 Fix UI bug that could result in paying unexpected fee (jonasschnelli)
  • #8911 7634d8e Translate all files, even if wallet disabled (laanwj)
  • #8540 1db3352 Fix random segfault when closing "Choose data directory" dialog (laanwj)
  • #7579 f1c0d78 Show network/chain errors in the GUI (jonasschnelli)

Wallet

  • #8443 464dedd Trivial cleanup of HD wallet changes (jonasschnelli)
  • #8539 cb07f19 CDB: fix debug output (crowning-)
  • #8664 091cdeb Fix segwit-related wallet bug (sdaftuar)
  • #8693 c6a6291 Add witness address to address book (instagibbs)
  • #8765 6288659 Remove "unused" ThreadFlushWalletDB from removeprunedfunds (jonasschnelli)

Tests and QA

  • #8713 ae8c7df create_cache: Delete temp dir when done (MarcoFalke)
  • #8716 e34374e Check legacy wallet as well (MarcoFalke)
  • #8750 d6ebe13 Refactor RPCTestHandler to prevent TimeoutExpired (MarcoFalke)
  • #8652 63462c2 remove root test directory for RPC tests (yurizhykin)
  • #8724 da94272 walletbackup: Sync blocks inside the loop (MarcoFalke)
  • #8400 bea02dc enable rpcbind_test (yurizhykin)
  • #8417 f70be14 Add walletdump RPC test (including HD- & encryption-tests) (jonasschnelli)
  • #8419 a7aa3cc Enable size accounting in mining unit tests (sdaftuar)
  • #8442 8bb1efd Rework hd wallet dump test (MarcoFalke)
  • #8528 3606b6b Update p2p-segwit.py to reflect correct behavior (instagibbs)
  • #8531 a27cdd8 abandonconflict: Use assert_equal (MarcoFalke)
  • #8667 6b07362 Fix SIGHASH_SINGLE bug in test_framework SignatureHash (jl2012)
  • #8673 03b0196 Fix obvious assignment/equality error in test (JeremyRubin)
  • #8739 cef633c Fix broken sendcmpct test in p2p-compactblocks.py (sdaftuar)
  • #8418 ff893aa Add tests for compact blocks (sdaftuar)
  • #8803 375437c Ping regularly in p2p-segwit.py to keep connection alive (jl2012)
  • #8827 9bbe66e Split up slow RPC calls to avoid pruning test timeouts (sdaftuar)
  • #8829 2a8bca4 Add bitcoin-tx JSON tests (jnewbery)
  • #8834 1dd1783 blockstore: Switch to dumb dbm (MarcoFalke)
  • #8835 d87227d nulldummy.py: Don't run unused code (MarcoFalke)
  • #8836 eb18cc1 bitcoin-util-test.py should fail if the output file is empty (jnewbery)
  • #8839 31ab2f8 Avoid ConnectionResetErrors during RPC tests (laanwj)
  • #8840 cbc3fe5 Explicitly set encoding to utf8 when opening text files (laanwj)
  • #8841 3e4abb5 Fix nulldummy test (jl2012)
  • #8854 624a007 Fix race condition in p2p-compactblocks test (sdaftuar)
  • #8857 1f60d45 mininode: Only allow named args in wait_until (MarcoFalke)
  • #8860 0bee740 util: Move wait_bitcoinds() into stop_nodes() (MarcoFalke)
  • #8882 b73f065 Fix race conditions in p2p-compactblocks.py and sendheaders.py (sdaftuar)
  • #8904 cc6f551 Fix compact block shortids for a test case (dagurval)

Documentation

  • #8754 0e2c6bd Target protobuf 2.6 in OS X build notes. (fanquake)
  • #8461 b17a3f9 Document return value of networkhashps for getmininginfo RPC endpoint (jlopp)
  • #8512 156e305 Corrected JSON typo on setban of net.cpp (sevastos)
  • #8683 8a7d7ff Fix incorrect file name bitcoin.qrc (bitcoinsSG)
  • #8891 5e0dd9e Update bips.md for Segregated Witness (fanquake)
  • #8545 863ae74 Update git-subtree-check.sh README (MarcoFalke)
  • #8607 486650a Fix doxygen off-by-one comments, fix typos (MarcoFalke)
  • #8560 c493f43 Fix two VarInt examples in serialize.h (cbarcenas)
  • #8737 084cae9 UndoReadFromDisk works on undo files (rev), not on block files (paveljanik)
  • #8625 0a35573 Clarify statement about parallel jobs in rpc-tests.py (isle2983)
  • #8624 0e6d753 build: Mention curl (MarcoFalke)
  • #8604 b09e13c build,doc: Update for 0.13.0+ and OpenBSD 5.9 (laanwj)
  • #8939 06d15fb Update implemented bips for 0.13.1 (sipa)

Miscellaneous

  • #8742 d31ac72 Specify Protobuf version 2 in paymentrequest.proto (fanquake)
  • #8414,#8558,#8676,#8700,#8701,#8702 Add missing copyright headers (isle2983, kazcw)
  • #8899 4ed2627 Fix wake from sleep issue with Boost 1.59.0 (fanquake)
  • #8817 bcf3806 update bitcoin-tx to output witness data (jnewbery)
  • #8513 4e5fc31 Fix a type error that would not compile on OSX. (JeremyRubin)
  • #8392 30eac2d Fix several node initialization issues (sipa)
  • #8548 305d8ac Use __func__ to get function name for output printing (MarcoFalke)
  • #8291 a987431 [util] CopyrightHolders: Check for untranslated substitution (MarcoFalke)

Credits

Thanks to everyone who directly contributed to this release:

  • adlawren
  • Alexey Vesnin
  • Anders Øyvind Urke-Sætre
  • Andrew Chow
  • Anthony Towns
  • BtcDrak
  • Chris Stewart
  • Christian Barcenas
  • Christian Decker
  • Cory Fields
  • crowning-
  • Dagur Valberg Johannsson
  • Ethan Heilman
  • fanquake
  • Gaurav Rana
  • Gregory Maxwell
  • instagibbs
  • isle2983
  • Jameson Lopp
  • Jeremy Rubin
  • jnewbery
  • Johnson Lau
  • Jonas Schnelli
  • jonnynewbs
  • Justin Camarena
  • Kaz Wesley
  • leijurv
  • Luke Dashjr
  • MarcoFalke
  • Marty Jones
  • Matt Corallo
  • Michael Ford
  • Pavel Janík
  • Pieter Wuille
  • rodasmith
  • Sev
  • Suhas Daftuar
  • whythat
  • Wladimir J. van der Laan

As well as everyone that helped translating on Transifex.