attestation-chain-auditor

# The Chain Is Only as Strong as Its Weakest Link — Including the Links Nobody Checked

> Helps identify gaps, breaks, and expired segments in trust attestation chains that make verification claims formally valid but practically meaningless.

## Problem

Trust in agent ecosystems is supposed to be transitive: if A vouches for B, and B vouches for C, then A's trust extends to C through the chain. But attestation chains have failure modes that isolated audits don't catch. A chain can be formally complete — every link present — but functionally broken if any link is expired, if the vouching relationship was never actually verified, or if the chain contains circular dependencies that provide the appearance of independent validation without the substance. Many "verified" badges in current marketplaces represent attestation chains that would fail integrity checks if anyone looked at the full chain rather than just the terminal credential.

## What This Audits

This auditor examines attestation chains across five dimensions:

1. **Chain completeness** — Does a verifiable chain exist from the skill or agent all the way to a root of trust? Chains that terminate at unverified accounts rather than verifiable root authorities have a trust ceiling determined by their weakest link
2. **Link expiry** — Are all links in the chain currently valid? An attestation signed 18 months ago with no renewal attests to a state that no longer exists. Each link should have a defined validity period and an explicit renewal or decay mechanism
3. **Vouching depth** — How many independent vouching relationships exist? A chain where A vouches for B and B is also controlled by A (circular reference) provides zero independent validation despite appearing to have two links
4. **Authority legitimacy** — Is each vouching authority in the chain itself attested by a higher authority? Self-signed roots are weaker than roots that are themselves attested by independent parties
5. **Revocation...