Certified Purity for Cognitive Workflow Executors: From Static Analysis to Cryptographic Attestation

TL;DR

This paper introduces a cryptographically certified purity architecture for cognitive workflow executors, ensuring effect-free modules through static and runtime verification, including remote attestation.

Contribution

It presents a novel architecture combining static structural constraints, cryptographic certificates, runtime gates, and remote attestation to enforce purity in cognitive workflows.

Findings

Effect-producing instructions are structurally absent in a restricted WebAssembly target.

Cryptographic certificates bind executors to their import classifications.

Runtime verification rejects uncertified executors with minimal latency.

Abstract

We present a certified purity architecture that converts governance enforcement in cognitive workflow systems from a runtime convention into a structural capability boundary. A prior three-layer governance architecture proves governance completeness, provenance completeness, and the impossibility of ungoverned effects, conditional on the pure module constraint: that step executors cannot perform effects. That constraint was enforced by module import graph analysis, which is insufficient against adversarial bypass on the BEAM virtual machine. This paper closes the gap through four mechanisms: (1) a restricted WebAssembly compilation target where effect-producing instructions are structurally absent; (2) purity certificates, cryptographically signed proofs binding executor binaries to their import classifications; (3) a runtime verification gate that rejects uncertified executors before they enter the governance pipeline; and (4) portable governance credentials via remote attestation for cross-organizational verification. We prove four theorems: structural purity by construction, bypass elimination for all five BEAM bypass classes, certificate integrity, and gate completeness. The guarantee holds relative to an explicit Trusted Computing Base. Evaluation on four implemented executors shows verification latency of 39--42 us, full plan cycle under 400 us, runtime overhead under 0.4% of a 100 ms HTTP request, and zero determinism divergences across repeated invocations.