CS5 — Public Procurement & Bidding

Setting. A government agency runs competitive tenders with high adversarial pressure.

Design

EPs for submissions; BTC‑only predicate for awards; receipts for clarifications; catalogs for transparency; witnesses for opening ceremony.

Policy Profile

CFS‑BTC‑Only for award; OKB mandatory for vendors; DAVS≥0.7.

Workflow

Vendor submission → EP and anchor intent → clarification receipts → award EP with BTC proof.

Evidence & Verification

Auditors evaluate EPs and BTC proofs offline; catalogs expose timelines for public review.

Cost & Operations

Batch weekly; watchers operated by civil society groups.

Outcomes

Public trust through verifiable, immutable timing without leaking contents.

Risks & Mitigations

Censorship attempts → cross‑jurisdiction watchers; denial‑of‑service → batching with intents.

KPIs

All awards meeting BTC depth≥6; public catalog freshness ≤ 24h.