Signing Skill Provides cryptographic message signing for the Stacks and Bitcoin ecosystems. Four signing standards are supported: - SIP-018 — Structured Clarity data signing. Signatures are verifiable both off-chain and by on-chain smart contracts via . - Stacks messages — SIWS-compatible plain-text signing. Used for wallet authentication and proving address ownership. - Bitcoin messages — BIP-137/BIP-322 hybrid. BIP-137 for legacy (1...) and wrapped SegWit (3...) addresses; BIP-322 "simple" for native SegWit (bc1q) and Taproot (bc1p) addresses. Compatible with Electrum, Bitcoin Core, and mod…