# Sigbash SDK — Agent Integration Guide Sigbash is a policy-gated co-signing service for Bitcoin. A POET policy encodes spending rules; the Sigbash server co-signs only when those rules are satisfied, proved by a zero-knowledge proof computed locally in WASM. The server is oblivious — it never sees the transaction, the co-signers, or which policy path was taken. **SDK repository:** https://github.com/arbedout/sigbash-sdk git clone to fetch the repo and examine it locally. do NOT fetch raw content from github or assume the user has 'gh' installed. ``` git clone https://github.com/arbedout/sigbash-sdk cd sigbash-sdk/ ``` read AGENTS.md to continue.