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W. J. van der Laan b7e3600815
Merge bitcoin/bitcoin#21526: validation: UpdateTip/CheckBlockIndex assumeutxo support 
673a5bd337 test: validation: add unittest for UpdateTip behavior (James O'Beirne)
2705570109 test: refactor: separate CreateBlock in TestChain100Setup (James O'Beirne)
298bf5d563 test: refactor: declare NoMalleation const auto (James O'Beirne)
071200993f move-only: unittest: add test/util/chainstate.h (James O'Beirne)
8f5710fd0a validation: fix CheckBlockIndex for multiple chainstates (James O'Beirne)
5a807736da validation: insert assumed-valid block index entries into candidates (James O'Beirne)
01a9b8fe71 validation: set BLOCK_ASSUMED_VALID during snapshot load (James O'Beirne)
42b2520db9 chain: add BLOCK_ASSUMED_VALID for use with assumeutxo (James O'Beirne)
b217020df7 validation: change UpdateTip for multiple chainstates (James O'Beirne)
665072a36d doc: add comment for g_best_block (James O'Beirne)
ac4051d891 refactor: remove unused assumeutxo methods (James O'Beirne)
9f6bb53935 validation: add chainman ref to CChainState (James O'Beirne)

Pull request description:

  This is part of the [assumeutxo project](https://github.com/bitcoin/bitcoin/projects/11) (parent PR: #15606)

  ---

  Modify UpdateTip and CheckBlockIndex for use with multiple chainstates. Includes a new unittest verifying `g_best_block` behavior (previously untested at the unit level) and various changes necessary for running and testing `ProcessNewBlock()`-like behavior on the background validation chainstate.

  This changeset introduces a new block index `nStatus` flag called `BLOCK_ASSUMED_VALID`, and it is applied to block index entries that are beneath the UTXO snapshot base block upon snapshot load. Once each block is validated (during async background validation), the flag is removed. This allows us to avoid (ab)using `BLOCK_VALID_*` flags for snapshot chain block entries, and preserves the original meaning of those flags.

  Note: this PR previously incorporated changes to `LoadBlockIndex()` and `RewindBlockIndex()` as noted in Russ' comments below, but once I generated the changes necessary to test the UpdateTip change, I decided to split this changes out into another PR due to the size of this one.

ACKs for top commit:
  achow101:
    ACK 673a5bd337
  jonatack:
    Code-review re-ACK 673a5bd337 reviewed diff, rebased to master/debug build/ran unit+functional tests
  naumenkogs:
    ACK 673a5bd337
  fjahr:
    Code review ACK 673a5bd337
  ariard:
    utACK 673a5bd3
  ryanofsky:
    Code review ACK 673a5bd337. Just linker fix and split commit changes mentioned https://github.com/bitcoin/bitcoin/pull/21526#issuecomment-921064563 since last review
  benthecarman:
    ACK 673a5bd337

Tree-SHA512: 0a6dc23d041b27ed9fd0ee1f3e5971b92fb1d2df2fc9b655d5dc48594235321ab1798d06de2ec55482ac3966a9ed56de8d56e9e29cae75bbe8690bafc2dda383
2021-09-23 22:22:07 +02:00
.github doc: Remove label from good first issue template 2020-08-24 09:31:24 +02:00
.tx qt: Bump transifex slug for 22.x 2021-04-21 13:46:41 +02:00
build-aux/m4 build, qt: Fix typo in QtInputSupport check 2021-08-27 17:50:30 +03:00
build_msvc Merge bitcoin/bitcoin#22219: multiprocess: Start using init makeNode, makeChain, etc methods 2021-09-16 08:47:38 +08:00
ci Merge bitcoin/bitcoin#22993: build: set OSX_MIN_VERSION to 10.15 2021-09-21 15:37:12 +08:00
contrib Merge bitcoin/bitcoin#22993: build: set OSX_MIN_VERSION to 10.15 2021-09-21 15:37:12 +08:00
depends build: set OSX_MIN_VERSION to 10.15 2021-09-16 17:50:19 +08:00
doc Merge bitcoin/bitcoin#22993: build: set OSX_MIN_VERSION to 10.15 2021-09-21 15:37:12 +08:00
share build: set OSX_MIN_VERSION to 10.15 2021-09-16 17:50:19 +08:00
src Merge bitcoin/bitcoin#21526: validation: UpdateTip/CheckBlockIndex assumeutxo support 2021-09-23 22:22:07 +02:00
test Merge bitcoin/bitcoin#23036: test: use test_framework.p2p P2P_SERVICES constant in functional tests 2021-09-23 17:13:02 +08:00
.cirrus.yml Merge bitcoin/bitcoin#22993: build: set OSX_MIN_VERSION to 10.15 2021-09-21 15:37:12 +08:00
.editorconfig ci: Drop AppVeyor CI integration 2021-09-07 06:12:53 +03:00
.gitattributes Separate protocol versioning from clientversion 2014-10-29 00:24:40 -04:00
.gitignore build: add *~ to .gitignore 2021-05-12 18:10:47 +02:00
.python-version Bump minimum python version to 3.6 2020-11-09 17:53:47 +10:00
.style.yapf test: .style.yapf: Set column_limit=160 2019-03-04 18:28:13 -05:00
autogen.sh scripted-diff: Bump copyright of files changed in 2019 2019-12-30 10:42:20 +13:00
configure.ac build: Restrict check for CRC32C intrinsic to aarch64 2021-09-21 12:36:46 +02:00
CONTRIBUTING.md Enable TLS in links in documentation 2021-09-16 22:00:20 +00:00
COPYING doc: Update license year range to 2021 2020-12-30 16:24:47 +01:00
INSTALL.md doc: Added hyperlink for doc/build 2021-09-09 19:53:12 +05:30
libbitcoinconsensus.pc.in build: remove libcrypto as internal dependency in libbitcoinconsensus.pc 2019-11-19 15:03:44 +01:00
Makefile.am test: Rename bitcoin-util-test.py to util/test_runner.py 2021-09-02 10:43:19 +02:00
README.md doc: Rework internal and external links 2021-02-17 09:18:46 +01:00
REVIEWERS release: remove gitian 2021-08-31 09:37:23 +08:00
SECURITY.md doc: Remove explicit mention of version from SECURITY.md 2019-06-14 06:39:17 -04:00

README.md

Bitcoin Core integration/staging tree

https://bitcoincore.org

For an immediately usable, binary version of the Bitcoin Core software, see https://bitcoincore.org/en/download/.

Further information about Bitcoin Core is available in the doc folder.

What is Bitcoin?

Bitcoin is an experimental digital currency that enables instant payments to anyone, anywhere in the world. Bitcoin uses peer-to-peer technology to operate with no central authority: managing transactions and issuing money are carried out collectively by the network. Bitcoin Core is the name of open source software which enables the use of this currency.

For more information read the original Bitcoin whitepaper.

License

Bitcoin Core is released under the terms of the MIT license. See COPYING for more information or see https://opensource.org/licenses/MIT.

Development Process

The master branch is regularly built (see doc/build-*.md for instructions) and tested, but it is not guaranteed to be completely stable. Tags are created regularly from release branches to indicate new official, stable release versions of Bitcoin Core.

The https://github.com/bitcoin-core/gui repository is used exclusively for the development of the GUI. Its master branch is identical in all monotree repositories. Release branches and tags do not exist, so please do not fork that repository unless it is for development reasons.

The contribution workflow is described in CONTRIBUTING.md and useful hints for developers can be found in doc/developer-notes.md.

Testing

Testing and code review is the bottleneck for development; we get more pull requests than we can review and test on short notice. Please be patient and help out by testing other people's pull requests, and remember this is a security-critical project where any mistake might cost people lots of money.

Automated Testing

Developers are strongly encouraged to write unit tests for new code, and to submit new unit tests for old code. Unit tests can be compiled and run (assuming they weren't disabled in configure) with: make check. Further details on running and extending unit tests can be found in /src/test/README.md.

There are also regression and integration tests, written in Python. These tests can be run (if the test dependencies are installed) with: test/functional/test_runner.py

The CI (Continuous Integration) systems make sure that every pull request is built for Windows, Linux, and macOS, and that unit/sanity tests are run automatically.

Manual Quality Assurance (QA) Testing

Changes should be tested by somebody other than the developer who wrote the code. This is especially important for large or high-risk changes. It is useful to add a test plan to the pull request description if testing the changes is not straightforward.

Translations

Changes to translations as well as new translations can be submitted to Bitcoin Core's Transifex page.

Translations are periodically pulled from Transifex and merged into the git repository. See the translation process for details on how this works.

Important: We do not accept translation changes as GitHub pull requests because the next pull from Transifex would automatically overwrite them again.