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   - Header file `include/secp256k1_musig.h` which defines the new API.
   - Document `doc/musig.md` for further notes on API usage.
   - Usage example `examples/musig.c`.
 - New CMake variable `SECP256K1_APPEND_LDFLAGS` for appending linker flags to the build command.

#### Changed
 - API functions now use a significantly more robust method to clear secrets from the stack before returning. However, secret clearing remains a best-effort security measure and cannot guarantee complete removal.
 - Any type `secp256k1_foo` can now be forward-declared using `typedef struct secp256k1_foo secp256k1_foo;` (or also `struct secp256k1_foo;` in C++).
 - Organized CMake build artifacts into dedicated directories (`bin/` for executables, `lib/` for libraries) to improve build output structure and Windows shared library compatibility.

#### Removed
 - Removed the `secp256k1_scratch_space` struct and its associated functions `secp256k1_scratch_space_create` and `secp256k1_scratch_space_destroy` because the scratch space was unused in the API.

#### ABI Compatibility
The symbols `secp256k1_scratch_space_create` and `secp256k1_scratch_space_destroy` were removed.
Otherwise, the library maintains backward compatibility with versions 0.3.x through 0.5.x.

## [0.5.1] - 2024-08-01

#### Added
 - Added usage example for an ElligatorSwift key exchange.

#### Changed
 - The default size of the precomputed table for signing was changed from 22 KiB to 86 KiB. The size can be changed with the configure option `--ecmult-gen-kb` (`SECP256K1_ECMULT_GEN_KB` for CMake).
 - "auto" is no longer an accepted value for the `--with-ecmult-window` and `--with-ecmult-gen-kb` configure options (this also applies to  `SECP256K1_ECMULT_WINDOW_SIZE` and `SECP256K1_ECMULT_GEN_KB` in CMake). To achieve the same configuration as p...

#### Fixed
 - Fixed compilation when the extrakeys module is disabled.

#### ABI Compatibility
The ABI is backward compatible with versions 0.5.0, 0.4.x and 0.3.x.

## [0.5.0] - 2024-05-06

#### Added
 - New function `secp256k1_ec_pubkey_sort` that sorts public keys using lexicographic (of compressed serialization) order.

#### Changed
 - The implementation of the point multiplication algorithm used for signing and public key generation was changed, resulting in improved performance for those operations.
   - The related configure option `--ecmult-gen-precision` was replaced with `--ecmult-gen-kb` (`SECP256K1_ECMULT_GEN_KB` for CMake).
   - This changes the supported precomputed table sizes for these operations. The new supported sizes are 2 KiB, 22 KiB, or 86 KiB (while the old supported sizes were 32 KiB, 64 KiB, or 512 KiB).

#### ABI Compatibility
The ABI is backward compatible with versions 0.4.x and 0.3.x.

## [0.4.1] - 2023-12-21

#### Changed
 - The point multiplication algorithm used for ECDH operations (module `ecdh`) was replaced with a slightly faster one.
 - Optional handwritten x86_64 assembly for field operations was removed because modern C compilers are able to output more efficient assembly. This change results in a significant speedup of some library functions when handwritten x86_64 assembly is...

#### ABI Compatibility
The ABI is backward compatible with versions 0.4.0 and 0.3.x.

## [0.4.0] - 2023-09-04

#### Added
 - New module `ellswift` implements ElligatorSwift encoding for public keys and x-only Diffie-Hellman key exchange for them.
   ElligatorSwift permits representing secp256k1 public keys as 64-byte arrays which cannot be distinguished from uniformly random. See:
   - Header file `include/secp256k1_ellswift.h` which defines the new API.
   - Document `doc/ellswift.md` which explains the mathematical background of the scheme.
   - The [paper](https://eprint.iacr.org/2022/759) on which the scheme is based.
 - We now test the library with unreleased development snapshots of GCC and Clang. This gives us an early chance to catch miscompilations and constant-time issues introduced by the compiler (such as those that led to the previous two releases).

#### Fixed
 - Fixed symbol visibility in Windows DLL builds, where three internal library symbols were wrongly exported.

#### Changed
 - When consuming libsecp256k1 as a static library on Windows, the user must now define the `SECP256K1_STATIC` macro before including `secp256k1.h`.

#### ABI Compatibility
This release is backward compatible with the ABI of 0.3.0, 0.3.1, and 0.3.2. Symbol visibility is now believed to be handled properly on supported platforms and is now considered to be part of the ABI. Please report any improperly exported symbols as...

## [0.3.2] - 2023-05-13
We strongly recommend updating to 0.3.2 if you use or plan to use GCC >=13 to compile libsecp256k1. When in doubt, check the GCC version using `gcc -v`.

#### Security
 - Module `ecdh`: Fix "constant-timeness" issue with GCC 13.1 (and potentially future versions of GCC) that could leave applications using libsecp256k1's ECDH module vulnerable to a timing side-channel attack. The fix avoids secret-dependent control ...

#### Fixed
 - Fixed an old bug that permitted compilers to potentially output bad assembly code on x86_64. In theory, it could lead to a crash or a read of unrelated memory, but this has never been observed on any compilers so far.

#### Changed
 - Various improvements and changes to CMake builds. CMake builds remain experimental.
   - Made API versioning consistent with GNU Autotools builds.
   - Switched to `BUILD_SHARED_LIBS` variable for controlling whether to build a static or a shared library.
   - Added `SECP256K1_INSTALL` variable for the controlling whether to install the build artefacts.
 - Renamed asm build option `arm` to `arm32`. Use `--with-asm=arm32` instead of `--with-asm=arm` (GNU Autotools), and `-DSECP256K1_ASM=arm32` instead of `-DSECP256K1_ASM=arm` (CMake).

#### ABI Compatibility
The ABI is compatible with versions 0.3.0 and 0.3.1.

## [0.3.1] - 2023-04-10
We strongly recommend updating to 0.3.1 if you use or plan to use Clang >=14 to compile libsecp256k1, e.g., Xcode >=14 on macOS has Clang >=14. When in doubt, check the Clang version using `clang -v`.

#### Security
 - Fix "constant-timeness" issue with Clang >=14 that could leave applications using libsecp256k1 vulnerable to a timing side-channel attack. The fix avoids secret-dependent control flow and secret-dependent memory accesses in conditional moves of me...

#### Added
  - Added tests against [Project Wycheproof's](https://github.com/google/wycheproof/) set of ECDSA test vectors (Bitcoin "low-S" variant), a fixed set of test cases designed to trigger various edge cases.

#### Changed
 - Increased minimum required CMake version to 3.13. CMake builds remain experimental.

#### ABI Compatibility
The ABI is compatible with version 0.3.0.

## [0.3.0] - 2023-03-08

#### Added
 - Added experimental support for CMake builds. Traditional GNU Autotools builds (`./configure` and `make`) remain fully supported.
 - Usage examples: Added a recommended method for securely clearing sensitive data, e.g., secret keys, from memory.
 - Tests: Added a new test binary `noverify_tests`. This binary runs the tests without some additional checks present in the ordinary `tests` binary and is thereby closer to production binaries. The `noverify_tests` binary is automatically run as par...

#### Fixed
 - Fixed declarations of API variables for MSVC (`__declspec(dllimport)`). This fixes MSVC builds of programs which link against a libsecp256k1 DLL dynamically and use API variables (and not only API functions). Unfortunately, the MSVC linker now wil...

#### Changed
 - Forbade cloning or destroying `secp256k1_context_static`. Create a new context instead of cloning the static context. (If this change breaks your code, your code is probably wrong.)
 - Forbade randomizing (copies of) `secp256k1_context_static`. Randomizing a copy of `secp256k1_context_static` did not have any effect and did not provide defense-in-depth protection against side-channel attacks. Create a new context if you want to ...