Agent-to-Agent Trust, Identity, and Verifiable Provenance

This document defines a trust model for agent-to-agent (A2A) interactions in multi-agent AI systems. It specifies how agents obtain verifiable identities via CA-signed templates, how spawn chains are cryptographically established and validated, how dynamic policies are governed under a dual-signature model, and how cross- organizational agent interactions are explicitly authorized. The model applies existing PKI primitives (X.509, CRL, CSR) and established identity patterns (OAuth 2.0, On-Behalf-Of) to the problem of agent provenance. This document does not address agent- to-resource access control, human-in-the-loop orchestration, or agent behavior, as those concerns belong to the resource enforcement layer and the orchestration layer respectively.