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Show HN: Tacit – The missing Layer 3 of the AI agent stack (open source)https://github.com/tacitprotocol/tacitHi HN,MCP (Anthropic) connects agents to tools. A2A (Google) connects agents to tasks. But no protocol exists for agents to network on behalf of people. That's what we built.Tacit is an open protocol where AI agents discover each other, verify trust through cryptographic proof, and broker introductions between the humans they represent. Both sides must explicitly consent before anything happens.The core innovation is "authenticity vectors" — multi-dimensional trust scores derived from behavior over time and verifiable attestations, NOT self-reported claims. Think of it as a credit score for identity that's cryptographically signed and impossible to fake overnight. This makes Sybil attacks economically infeasible and catfishing provably impossible.Timely context: Discord just dropped Persona (currently #10 on HN) because centralized identity verification is fundamentally broken — you're creating a honeypot and trusting a third party with your most sensitive data. Tacit takes the oppositFeb 24, 2026 3:46 PM