Bitcoin Core

This commit fixes a build problem when compiling Bitcoin Core's bundled Qt library on Apple Silicon Macs using a future macOS 26.4 software development kit. It changes the order in which the compiler checks for a low-level CPU 'yield' instruction so that the correct built-in function is chosen, avoiding an 'implicit function declaration' compiler error. There is no runtime security issue here; it is purely a compilation fix.

This commit removes unused software-building helper imports from a Guix packaging manifest. It is a routine cleanup with no security relevance.

This commit is a straightforward internal code cleanup: it changes the ParseDouble helper function to return a C++ std::optional<double> instead of writing a result through a pointer and returning a boolean success flag. The behavior of parsing JSON numbers remains the same, and no security issue is present.

This commit is a straightforward internal code cleanup. It changes one helper function so that it returns a wallet name directly (using std::optional) instead of writing it into a caller-provided variable and returning true/false. There is no change to user-visible behavior, no bug fix, and no security relevance.

This is a clean internal code refactor: a helper function that looks up a log category by name now returns an optional value instead of writing to an output parameter. No behavior changes, no security implications.

This is a one-line fix in a fuzz test (automated randomized test) for Bitcoin Core's coin selection logic. It changes a variable that tracks the 'best waste' amount from a 32-bit signed integer to a 64-bit signed integer type, matching the actual CAmount type. The change prevents a possible integer overflow inside the fuzz test itself, not in the production wallet code that handles real Bitcoin transactions. It does not appear to be a security vulnerability in live Bitcoin Core software.

This commit removes an unused optional flag from a test helper function in Bitcoin Core's internal testing framework. It only affects test code, not the live Bitcoin network or wallet software, and has no security relevance.

This change only touches Bitcoin Core's internal Python test framework. It makes a test helper wait for an old peer connection to fully disappear before creating a new one, reducing flaky test failures. It does not change the actual Bitcoin node software that users run, so it has no direct security impact on the network or on users.

This commit only changes a test file that exercises the setban RPC. It makes the existing test stricter and easier to read by fixing a typo, adding waits for disconnections, moving a node restart outside a debug-log context, and adding an extra assertion. There is no change to production code, so it does not introduce or fix a security vulnerability in Bitcoin Core itself.

This commit adds a small helper function to Bitcoin Core's internal test framework. It lets one test node check whether it is connected to another test node by comparing their network version strings. There is no change to the actual Bitcoin Core software that users run, and no security issue is visible in the code.

This commit updates the libmultiprocess library inside Bitcoin Core. The most important changes are fixes for three race-condition bugs that could crash or destabilize the inter-process communication (IPC) layer when a connection is disconnected while worker threads are starting, running, or finishing. The commit also adds a new way to represent null data values in IPC messages, improves build/CI scripts, and bumps the library version. The race fixes are defensive hardening rather than obviously exploitable vulnerabilities, but they remove real crash paths that could be triggered by an attacker able to disconnect an IPC session at the right moment.

This is a pure code cleanup (refactor) that renames the type used for ping timing variables from std::chrono::microseconds to NodeClock::duration. The commit message explicitly states it does not change behavior, and the diff shows only type aliases and documentation updates. There is no security issue here.

This commit only fixes spelling and wording in code comments. It changes 'criterium' to 'criterion' and rephrases 'round-trip time' to 'round-trip duration' in documentation-style comments. No program logic, behavior, or security properties are changed.

This is a minor code cleanup in Bitcoin Core's graphical user interface. A helper function that turns a time duration into human-readable text now accepts a more precise input type (nanoseconds) but still behaves exactly the same way it did before—any fractional seconds are still ignored. There is no security issue here.

This is a small code cleanup that replaces hand-written time-unit conversions with safer, purpose-built helper functions. It does not change program behavior or fix any security issue.

This is a one-line code cleanup in Bitcoin Core. It replaces an older way of getting the current time with a newer, type-correct equivalent. The commit message explicitly says it does not change behavior, and the diff shows only that single replacement with no logic changes.

This commit is a minor code cleanup with no security relevance. It adds a named alias 'NodeClock::epoch' for the zero time point and a compile-time check that it equals zero. No behavior changes, no bug fixes, and no security impact.

This commit is a test-only cleanup. It removes a custom test logging hook called DEBUG_LOG_OUT and replaces it with Bitcoin Core's existing -printtoconsole=1 command-line option. There is no change to the production wallet, networking, consensus, or node code that ordinary users run.

This commit only adds a new test case to Bitcoin Core's functional test suite. It checks that when a user starts the software with an unusually high fallback transaction fee, the software still works but prints a warning message. There is no code change to the actual Bitcoin Core wallet or fee logic—only a test that verifies existing behavior.

This commit only changes a test file. It improves an existing functional test to verify that Bitcoin Core's wallet correctly fails to send transactions when the fallback fee is unset or set to zero, and succeeds when a fallback fee is configured. There is no change to production code, no security fix, and no vulnerability being patched.

This is a minor test-code cleanup. It renames a test class to match the actual topic (fallback fee), shortens a comment, and pulls three repeated 'sending must fail' checks into a helper function. No production code or security behavior is changed.

This commit only changes Bitcoin Core's internal fuzz testing code, which is used to automatically generate random inputs to find bugs during development. It does not change any production networking, consensus, or wallet code that runs on real Bitcoin nodes. There is no security issue here for end users.

This Bitcoin Core commit tweaks how the node decides whether a privately broadcast transaction is 'stale' and should be re-broadcast. Previously, a transaction could be marked stale just one minute after it was added, even if it had never actually been sent to any peer. Now, transactions that have not yet been picked for sending use a longer five-minute window, while already-sent transactions keep the one-minute window. The commit also exposes the 'time_added' field in an RPC diagnostic so users can see when each transaction entered the private-broadcast queue. There is no claim in the commit that this fixes a security vulnerability; it reads as a robustness/usability improvement.

This commit simply removes two outdated code comments (TODOs) from a Bitcoin Core wallet file related to external signers. No actual code behavior was changed, so it does not fix or introduce any security issue on its own.

This commit removes unused global pointer variables in three test-only fuzzing files. It is a code cleanup change to silence compiler warnings and has no effect on the live Bitcoin Core software that users run.