Title: Open-source C++ secp256k1 library with full Bitcoin stack: Taproot, Silent Payments, MuSig2, FROST, BIP-32/44, and GPU acceleration

I've been building a comprehensive secp256k1 library that covers the full modern Bitcoin protocol stack:

???? Bitcoin-specific:

• Taproot (BIP-341/342) with tweak + Merkle tree
• BIP-352 Silent Payments
• MuSig2 (BIP-327) — 2-round key aggregation
• FROST threshold signatures (t-of-n)
• BIP-32 HD derivation (xprv/xpub, path parsing)
• BIP-44 coin-type derivation
• All address types: P2PKH, P2WPKH, P2TR, Base58Check, Bech32/Bech32m

⚡ Performance:

• x64 assembly with BMI2/ADX (3-5× speedup)
• CUDA GPU batch processing (4.63M key generations/sec)
• GLV endomorphism, precomputation tables
• Zero heap allocations in hot paths

???? Security:

• Constant-time operations (dedicated ct namespace)
• RFC 6979 deterministic nonces
• Low-S normalization
• 200+ tests with known vector verification

Zero external dependencies. MIT licensed.

GitHub: [github.com/shrec/UltrafastSecp256k1](vscode-file://vscode-app/c:/Users/shrek/AppData/Local/Programs/Microsoft%20VS%20Code/b6a47e94e3/resources/app/out/vs/code/electron-browser/workbench/workbench.html)