Enforcement Kernel v0.1
Schema-validated tokens. Fixed-order policy rules. Append-only hash-chain ledger. Every decision recorded, every re-entry quarantined, every hop counted.
Foundation
Every decision is recorded with its evidence. The ledger feeds back into the system as proof that enforcement occurred. No silent drops, no unlogged denials.
Tokens carry their own labels, lineage, and constraints. The enforcement boundary (PEP) never inspects payload content directly. Policy acts on metadata, not meaning.
Every token knows its parent, its sequence number, and how many hops remain. Re-entry triggers quarantine. The chain of custody is cryptographically verifiable.
Architecture
Schema-validated data envelope with labels, lineage, and provenance hash
Policy Enforcement Point constructs context and submits to the decision engine
Policy Decision Point evaluates 14 ingress rules in fixed order, returns admit/deny/quarantine
Append-only hash chain records every decision with cryptographic binding to the policy that produced it
Applications
SCADA and process control systems where every register read, setpoint change, and telemetry export must be admitted through a custody chain. Seldon enforces what crosses the boundary.
Regulated data flows (CFR 21 Part 11, IEC 62443) where every decision must be audit-provable. The ledger provides tamper-evident evidence that enforcement occurred at every step.
AI pipelines where data passes through multiple processing stages. Seldon tokens track lineage, enforce hop budgets, and quarantine re-entry attempts from untrusted domains.
Positioning