Open protocol for AI agent work contracts and verifiable execution. Ed25519-signed authorization, causal evidence chains, offline verification. 2,281 tests. Apache-2.0. MCP connects agents to tools. A2A connects agents. But when your agent says "I ran the tests," nobody can verify that claim at the protocol level — until now. OpenWorkProof is a middleware layer that records every authorization decision, execution receipt, and evidence publication in a cryptographically signed chain.