bsv-ruby-sdk 0.15.0

0.15.0 — 2026-04-29

Added

• Extracted secp256k1 elliptic curve operations to the standalone
  secp256k1-native gem, with an optional native C extension providing
  ~22x speedup for field, scalar, and Jacobian point operations (#648)
• Native C extension scaffold with field arithmetic, scalar arithmetic,
  and Jacobian point operations (#627, #628, #629, #630, #631)
• Constant-time Montgomery ladder with branchless conditional swap for
  scalar multiplication; mul is now constant-time by default, with
  mul_vt available for variable-time use cases (#641, #653)
• Wycheproof Bitcoin ECDSA test vectors (463 cases) with explicit
  categorisation of high-S malleability cases as mathematically valid
  but policy-rejected — documenting the layer separation between
  ECDSA verification and Bitcoin's low-S enforcement (#652)
• Wycheproof standard ECDSA test vectors (474 cases), RFC 6979
  compliance suite, and secp256k1 field/scalar/point compliance
  examples (#636, #637, #638)

Fixed

• Carry overflow in schoolbook multiplication (L2) and branchless
  borrow extraction in field reduction (#631)
• Gemspec version floor, docstring, and variable name corrections
  from PR review (#653)

Changed

• Replaced BN hex intermediaries with direct binary construction
  for improved performance (#622)
• Binary byte comparison in SignedMessage verification (#624)