Show HN: Moss – Cryptographic signing for AI agents

I've spent 20 years building identity and security systems (EA, Nexon IPO, two patents in cryptographic auth). Started building multi-agent pipelines last year and hit a problem: when something breaks, there's no way to know which agent produced what.

MOSS gives agents cryptographic identities and signs their outputs. Each signature includes ML-DSA-44 (post-quantum, FIPS 204), a sequence number for replay detection, and a SHA-256 payload hash.

    pip install moss-sdk

    from moss import Subject
    
    agent = Subject.create("moss:myapp:agent-1")
    envelope = agent.sign({"action": "approve", "amount": 500})

Keys stored locally at ~/.moss/keys/. No cloud, no account.

Framework integrations: moss-crewai, moss-autogen, moss-langgraph, moss-langchain

Why post-quantum: audit logs need to stay verifiable for years. Chose ML-DSA-44 over Ed25519 for that reason.

Spec: https://github.com/mosscomputing/moss/blob/main/SPEC.md Site: https://mosscomputing.com

Happy to answer questions on the design.