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MarcoFalke 7060d2d97a
Merge #18350: test: Fix mining to an invalid target + ensure that a new block has the correct hash internally 
7a6627ae87 Fix mining to an invalid target + ensure that a new block has the correct hash internally in Python tests (Samer Afach)

Pull request description:

  Test with block 47 in the `feature_block.py` creates a block with a hash higher than the target, which is supposed to fail. Now two issues exist there, and both have low probability of showing up:

  1. The creation is done with `while (hash < target)`, which is wrong, because hash = target is a valid mined value based on the code in the function `CheckProofOfWork()` that validates the mining target:
  ```
      if (UintToArith256(hash) > bnTarget)
          return false;
  ```
  2. As we know the hash stored in CBlock class in Python is stateful, unlike how it's in C++, where calling `CBlock::GetHash()` will actively calculate the hash and not cache it anywhere. With this, blocks that come out of the method `next_block` can have incorrect hash value when `solve=False`. This is because the `next_block` is mostly used with `solve=True`, and solving does call the function `rehash()` which calculates the hash of the block, but with `solve=False`, nothing calls that method. And since the work to be done in regtests is very low, the probably of this problem showing up is very low, but it practically happens (well, with much higher probability compared to issue No. 1 above).

  This PR fixes both these issues.

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Tree-SHA512: f3b54d18f5073d6f1c26eab89bfec78620dda4ac1e4dde4f1d69543f1b85a7989d64c907e091db63f3f062408f5ed1e111018b842819ba1a5f8348c7b01ade96
2020-03-16 16:31:42 -04:00
.github Remove GitHub Actions CI workflow. 2020-01-30 18:45:28 +00:00
.tx tx: Bump transifex slug to 020x 2020-03-16 10:52:55 +01:00
build-aux/m4 build: remove Boost Chrono detection from build system 2020-03-07 08:34:31 +08:00
build_msvc build: remove Boost Chrono detection from build system 2020-03-07 08:34:31 +08:00
ci Merge #18304: ci: Enable all functional tests in valgrind 2020-03-11 08:39:09 -04:00
contrib guix: Remove now-unnecessary gcc make flag 2020-03-11 16:16:31 -04:00
depends build: remove chrono package from depends Boost 2020-03-07 08:34:30 +08:00
doc Merge #18208: rpc: Change RPCExamples to bech32 2020-03-11 12:42:47 -04:00
share Merge #17660: build: remove deprecated key from macOS Info.plist 2020-02-05 14:26:00 +01:00
src Merge #18346: rpc: Document an RPCResult for all calls; Enforce at compile time 2020-03-16 18:04:08 +01:00
test Merge #18350: test: Fix mining to an invalid target + ensure that a new block has the correct hash internally 2020-03-16 16:31:42 -04:00
.appveyor.yml Updated appveyor job to checkout a specific vcpkg commit ID. 2020-01-25 19:07:03 +00:00
.cirrus.yml ci: remove OpenSSL installation 2019-11-18 08:56:48 -05:00
.gitattributes
.gitignore Merge #18108: Fix .gitignore policy in build_msvc directory 2020-02-15 10:40:44 -08:00
.python-version .python-version: Specify full version 3.5.6 2019-03-02 12:06:26 -05:00
.style.yapf test: .style.yapf: Set column_limit=160 2019-03-04 18:28:13 -05:00
.travis.yml ci: Run fuzz testing test cases under valgrind 2020-02-18 06:56:26 +00:00
autogen.sh scripted-diff: Bump copyright of files changed in 2019 2019-12-30 10:42:20 +13:00
configure.ac Merge #18290: build: Set minimum Automake version to 1.13 2020-03-11 16:31:38 +01:00
CONTRIBUTING.md Merge #18283: doc: Explain rebase policy in CONTRIBUTING.md 2020-03-11 16:01:25 +01:00
COPYING doc: Update license year range to 2020 2019-12-26 23:11:21 +01:00
INSTALL.md Update INSTALL landing redirection notice for build instructions. 2016-10-06 12:27:23 +13:00
libbitcoinconsensus.pc.in build: remove libcrypto as internal dependency in libbitcoinconsensus.pc 2019-11-19 15:03:44 +01:00
Makefile.am build: Add LCOV exception for crc32c 2020-01-28 17:01:48 +01:00
README.md doc: Fix some misspellings 2019-11-04 04:22:53 -05:00
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

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, as well as an immediately usable, binary version of the Bitcoin Core software, see https://bitcoincore.org/en/download/, or read the original 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 and tested, but is not guaranteed to be completely stable. Tags are created regularly to indicate new official, stable release versions of Bitcoin Core.

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, that are run automatically on the build server. These tests can be run (if the test dependencies are installed) with: test/functional/test_runner.py

The Travis CI system makes 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.

Translators should also subscribe to the mailing list.