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Matt Corallo 16e95bda86 Move maximum timewarp attack threshold back to 600s from 7200s
In 6bfa26048d the testnet4 timewarp
attack fix block time variation was increased from the Great
Consensus Cleanup value of 600s to 7200s on the thesis that this
allows miners to always create blocks with the current time. Sadly,
doing so does allow for some nonzero inflation, even if not a huge
amount.

While it could be that some hardware ignores the timestamp provided
to it over Stratum and forces the block header timestamp to the
current time, I'm not aware of any such hardware, and it would also
likely suffer from random invalid blocks due to relying on NTP
anyway, making its existence highly unlikely.

This leaves the only concern being pools, but most of those rely on
work generated by Bitcoin Core (in one way or another, though when
spy mining possibly not), and it seems likely that they will also
not suffer any lost work. While its possible that a pool does
generate invalid work due to spy mining or otherwise custom logic,
it seems unlikely that a substantial portion of hashrate would do
so, making the difference somewhat academic (any pool that screws
this up will only do so once and the network would come out just
fine).

Further, while we may end up deciding these assumptions were
invalid and we should instead use 7200s, it seems prudent to try
with the value we "want" on testnet4, giving us the ability to
learn if the compatibility concerns are an issue before we go to
mainnet.
2024-08-13 18:21:03 +00:00
.github ci: Silent Homebrew's reinstall warnings 2024-08-05 17:14:33 +01:00
.tx qt: Bump Transifex slug for 28.x 2024-07-30 16:14:19 +01:00
build-aux/m4 qt, build: Drop QT_STATICPLUGIN macro 2024-08-01 14:01:07 +01:00
build_msvc build: remove check for __declspec(dllexport) 2024-08-05 14:54:56 +01:00
ci lint: Find function calls in default arguments 2024-08-09 08:11:16 +02:00
contrib Merge bitcoin/bitcoin#30246: contrib: asmap-tool - Compare ASMaps with respect to specific addresses 2024-08-12 16:17:42 -04:00
depends Revert "depends: Fetch miniupnpc sources from an alternative website" 2024-08-07 15:31:45 -04:00
doc Merge bitcoin/bitcoin#30580: doc: Add note about distro's g++-mingw-w64-x86-64-posix version 2024-08-12 11:40:22 +01:00
share contrib: rpcauth.py - Add new option (-j/--json) to output text in json format 2024-04-25 08:32:28 -05:00
src Move maximum timewarp attack threshold back to 600s from 7200s 2024-08-13 18:21:03 +00:00
test Merge bitcoin/bitcoin#30607: contrib: support reading XORed blocks in linearize-data.py script 2024-08-12 15:03:35 -04:00
.cirrus.yml Squashed 'src/secp256k1/' changes from 4af241b320..642c885b61 2024-08-02 11:32:47 +01:00
.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 Squashed 'src/secp256k1/' changes from 4af241b320..642c885b61 2024-08-02 11:32:47 +01:00
.python-version Bump .python-version from 3.9.17 to 3.9.18 2023-10-24 18:51:24 +02:00
.style.yapf Update .style.yapf 2023-06-01 23:35:10 +05:30
autogen.sh build: make sure we can overwrite config.{guess,sub} 2023-06-13 14:58:43 +02:00
configure.ac Merge bitcoin/bitcoin#30590: build: Remove unused visibility checks 2024-08-06 17:44:43 +01:00
CONTRIBUTING.md Squashed 'src/secp256k1/' changes from 4af241b320..642c885b61 2024-08-02 11:32:47 +01:00
COPYING doc: upgrade Bitcoin Core license to 2024 2024-01-10 16:29:01 -06:00
INSTALL.md doc: Added hyperlink for doc/build 2021-09-09 19:53:12 +05:30
Makefile.am Squashed 'src/secp256k1/' changes from 4af241b320..642c885b61 2024-08-02 11:32:47 +01:00
README.md Squashed 'src/secp256k1/' changes from 4af241b320..642c885b61 2024-08-02 11:32:47 +01:00
SECURITY.md Update security.md contact for achow101 2023-12-14 18:14:54 -05:00

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/.

What is Bitcoin Core?

Bitcoin Core connects to the Bitcoin peer-to-peer network to download and fully validate blocks and transactions. It also includes a wallet and graphical user interface, which can be optionally built.

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

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.