libsecp256k1 v0.6.0: MuSig2 Support & Other Improvements

• "libsecp256k1 v0.6.0 is out! Featuring the highly anticipated musig module and other improvements," announced ncklr.
• This release adds a musig module, adds a significantly more robust method to clear secrets from the stack, and removes the unused secp256k1_scratch_space functions.

"In particular, the API functions now use a significantly more robust method to clear secrets from the stack before returning. Thanks to our contributors: @achow101, Cheapshot003 @hhebasto, @pwuille, @real_or_random, Russell O'Connor, @theStack, and all reviewers," added the developer.

What's new

• New module musig implements the MuSig2 multisignature scheme according to the BIP 327 specification. See:
  • 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.
• 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 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.

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