Show HN: AgentSign – Open-source zero trust engine for AI agents https://ift.tt/T8v5iEW

Show HN: AgentSign – Open-source zero trust engine for AI agents Hi HN. This week Meta acquired Moltbook (agent social network), OpenAI acquired Promptfoo (agent testing), and Mandiant's founder raised $190M for Armadin. Agent infrastructure is clearly where things are heading. We built AgentSign -- a zero trust engine for AI agents. The problem: agents are operating without any identity infrastructure. Moltbook went viral for fake posts because there was zero verification on who or what was posting. AgentSign gives every agent a cryptographic identity certificate, signs every action into an execution chain, and runs runtime code attestation before anything executes. There's also an MCP Trust Layer for agent-to-MCP server verification, and a Stripe-powered Trust Gate for agent payments. 5 subsystems: identity certs, execution chain verification, runtime code attestation, output tamper detection, and cryptographic trust scoring. Free and open source. Built in London. SDK: https://ift.tt/XQ5vUD9 Happy to answer questions. https://ift.tt/ugfpoAB March 11, 2026 at 09:57AM