# L2 — 策略引擎 OPA

## 设计

* **链上**：`PolicyRegistry` 存 policyHash + 元数据
* **链下**：`baby-opa-policy` Rust crate (mini-Rego evaluator) 评估 policy against BehaviorSpec context
* **绑定**：`PoBRegistry.submitBatchWithPolicy()` 强制 batch.policyHash 等于 PoBRegistry.configuredPolicyHash

## 真链 e2e (chain 391)

3 case 全绿：

* **Compliant**: 满足 EU AI Act 5 项要求 → allow
* **Denied**: 缺少 human\_oversight → deny
* **NonCompliant**: 触发 prohibited\_practice (social\_scoring) → deny

详见：[PolicyRegistry 确权](/registries-que-quan/policy-registry.md) + [Rego 算法](/algorithms/opa-rego-policy-evaluation.md) + [EU AI Act 模板](/protocol-mechanics/regulatory-anchor.md) + [L2 OPA SDK e2e devlog](https://github.com/leeleeEcho/babyDriver_Layer2/blob/main/docs/devlog/2026-Q2/2026-04-30-DAY-SUMMARY.md)。


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