An ASIL-M Profile for Multi-Root Evidence Synthesis in RATS

This document defines an application profile for Remote ATtestation procedureS (RATS) deployments in which authorization decisions depend on evidence from multiple independent trust roots. The profile is intended for AI inference systems that require explicit cross-root appraisal before execution is authorized. The document specifies three related artifacts: * an Attestation Evidence Synthesis Protocol for combining multiple evidence sets into one deterministic appraisal outcome; * the Twin Attestation Policy Language (TAPL), a constrained policy language for deterministic multi-root appraisal; and * the Canonical Attestation Record (CAR), an audit-oriented envelope that binds evidence references, appraisal outputs, freshness information, and replay-verification metadata. CAR is not a replacement for Evidence or Attestation Results as used in the RATS architecture. Instead, it is a higher-layer profile for packaging multi-root appraisal state and application-specific bindings for replay and audit.