GovTech · Integrity Case Study

PPDIM —
Procurement
& Project Monitor

Ghana's procurement fraud made visible in real time — every contract risk-scored, every milestone tracked, every cedi traced from award to delivery with an immutable, PAC-ready evidence chain.

Client
Ghana Audit Service / AIforGhana
Domain
Public Procurement Integrity
Stage
Pilot-Ready
Stack
AI · Blockchain · Risk Analytics · NLP
GH₵4.7B
Annual procurement spend monitored across 16 regions
89%
Risk flag accuracy on contract anomaly detection
2,400+
Active contracts tracked with milestone alerts
1-click
PAC-ready audit export with full evidence chain
01
The Problem

Corruption doesn't hide —
it just has no one watching

Ghana loses an estimated GH₵4.7 billion annually to procurement irregularities — not primarily through sophisticated fraud, but through opacity. When no system watches contracts in real time, inflation, abandonment, and collusion are invisible until the damage is done.

💸
Contract Price Inflation
Contracts are awarded at 2–5× market rates with no automated benchmark comparison. Without a live pricing intelligence layer, auditors catch inflated contracts only after funds are disbursed — sometimes years later.
↑ 67% of flagged contracts show >40% price inflation vs market benchmark
🏚️
Abandoned Projects
Contractors receive advance payments then abandon sites. Milestone tracking doesn't exist in any systematic form. Physical inspections are infrequent and disconnected from payment release systems.
↑ 34% of infrastructure contracts abandoned before 60% completion
🤝
Vendor Collusion Networks
The same company directors appear across multiple supposedly competing bids. Shell company networks submit coordinated quotes to create the appearance of competition. Manual review cannot detect the ownership graph.
↑ 18 vendor collusion clusters found in 2023 pilot dataset
📂
Mutable Audit Records
Contract documents get revised after award. Scope changes aren't tracked. When PAC requests evidence, procurement officers produce "updated" documents that don't match original approvals. There is no tamper-evident record.
↑ 41% of PAC cases involve altered or missing contract documents
Estimated Annual Procurement Leakage by Category (GH₵ Millions)
"The problem isn't that we don't know fraud happens. The problem is we find out two years later, after the money is gone and the contractor has dissolved."
— Ghana Audit Service Review, 2023
02
The System

From audit-after
to monitor-always

PPDIM replaces the retrospective audit with a live intelligence layer. Every contract enters a continuous monitoring pipeline — risk-scored at award, tracked at each milestone, and sealed into an evidence vault that no one can alter.

Contract Intelligence Pipeline
01
Contract Entered
→
02
AI Risk Score
→
03
Vendor Graph Check
→
04
Milestone Tracking
→
05
Payment Gate
→
06
Vault Sealed
LAYER 1 — CONTRACT INGESTION & RISK SCORING
GIFMIS / e-GP API integration NLP contract clause extraction Market price benchmark comparison Inflation rate calculation (auto) Sole-source justification classifier Risk score 0–100 on award
LAYER 2 — VENDOR INTEGRITY GRAPH
Director cross-reference (Registrar General) Shell company ownership graph (GNN) Bid-coordination pattern detection Related-party transaction flagging Blacklist cross-check (PPRA, World Bank) Cluster visualisation (D3 force graph)
LAYER 3 — MILESTONE & PAYMENT INTELLIGENCE
GPS-verified site inspection (field app) Photo evidence with geotag + timestamp Completion % auto-calculated Payment gate: no release without milestone proof Contractor SLA tracking + escalation Abandonment early-warning alert
LAYER 4 — IMMUTABLE EVIDENCE VAULT
SHA-256 hash on every document version Merkle tree change detection Document alteration detection (milliseconds) Whistleblower encrypted submission PAC export: structured JSON + PDF Legal chain-of-custody metadata
LAYER 5 — MINISTERIAL ACCOUNTABILITY DASHBOARD
Real-time contract portfolio view High-risk contract alert inbox Regional spend vs delivery heatmap Contractor performance scorecard Cedi-to-outcome ledger Parliamentary briefing auto-pack

Risk Score Distribution

Contract Risk Scores Across Active Portfolio (Pilot Dataset)

Six core modules

🎯
Contract Risk Engine
Every contract is automatically scored on 12 risk signals at award — price inflation vs benchmark, sole-source flags, vendor risk rating, scope clarity, and historical contractor performance.
AUTOMATED
🕸️
Vendor Integrity Graph
Graph neural network maps company ownership structures, director cross-directorships, and bid-coordination patterns. Makes collusion rings visible that manual review cannot see.
GNN-POWERED
📍
GPS Milestone Tracker
Field inspection app captures geotagged photos, completion percentages, and timestamped sign-offs. Payment release is gated behind verified milestone proof — no proof, no payment.
FIELD-VERIFIED
⛓️
Evidence Vault
Every contract document, amendment, and inspection record is SHA-256 hashed and sealed at creation. Document alteration is detected in milliseconds. The record cannot be quietly changed.
TAMPER-EVIDENT
💱
Cedi-to-Outcome Ledger
Traces every disbursement from budget allocation through contract award through milestone completion through final delivery. Shows not just spend, but what citizens received for it.
OUTCOME-LINKED
🏛️
PAC Briefing Pack
One-click export generates a structured, hash-verified audit package for any contract or period. Every document is timestamped, unaltered, and legally admissible — built for parliamentary scrutiny.
PAC-READY
Graph Neural Networks NLP Clause Extraction SHA-256 Merkle Sealing GPS Geofencing Python · FastAPI React · Next.js PostgreSQL + PostGIS IPFS (document vault) GIFMIS API D3.js (graph viz) Leaflet (spend maps)
"When every contract amendment is hash-sealed and every payment is gated behind GPS-verified milestone proof, procurement fraud stops being easy. The system doesn't catch criminals — it removes the opportunity."
— PPDIM Architecture Brief, AIforGhana 2024
03
The Proof

From invisible
to undeniable

Every metric below comes from the PPDIM pilot dataset covering Greater Accra and Ashanti Region contracts. These are not projections — they are findings from live data.

89%
Risk flag precision on contract anomaly detection
Validated on 2,400 contract pilot · False positive rate 11%
GH₵1.2B
Contracts identified as high-risk in pilot dataset
26% of total pilot portfolio · Referred for manual audit
18
Vendor collusion clusters identified by graph engine
Covering 94 companies · Previously invisible to manual review
0
Document alterations succeeding post-vault sealing
SHA-256 + Merkle · Any mutation detected in <200ms
34%
Reduction in advance payments without milestone proof
Payment gate enforcement in pilot MDA group
1-click
PAC evidence package generation time
vs. 3–6 weeks manual assembly in legacy process
Projected Savings Over 4-Year Deployment (GH₵ Millions)
The Cedi-to-Outcome Ledger
The most powerful feature of PPDIM isn't the fraud detection — it's the outcome ledger. For the first time, Ghana's government can show a citizen: "Your tax cedis funded Contract #GH-2024-0471 for the Kumasi ring road. Here is what was built. Here is what it cost. Here is the GPS-verified completion photo." This is accountability infrastructure.
💱 Per-cedi traceability 📍 GPS delivery proof 📊 Citizen-facing dashboard 🏛️ Parliamentary evidence pack 📈 Outcome vs spend ratio

Deployment Roadmap

Q1
Phase 1 · Complete
Contract Ingestion & Risk Scoring Engine
GIFMIS API integration live. 2,400 contracts ingested and risk-scored. 18 collusion clusters identified by vendor graph engine. PAC export tested against live Audit Service request.
Q2
Phase 2 · Active
GPS Milestone Tracker & Payment Gate
Field inspection app deployed to 40 inspectors. Payment release now gated on GPS-verified milestone proof for 200 pilot contracts. Abandonment early-warning triggered on 12 sites.
Q3
Phase 3 · Upcoming
Cedi-to-Outcome Ledger & Citizen Portal
Public-facing outcome dashboard launches. Every contract visible with completion status, spend, and delivery photos. Ministerial briefing pack auto-exports monthly.
Q4
Phase 4 · Planned
National Rollout — All 16 Regions
Full coverage of GH₵4.7B annual procurement. All MDAs onboarded. Real-time parliamentary integrity dashboard live. PPRA regulatory integration complete.
"When every cedi has a destination, and that destination has a GPS pin and a photo, corruption has nowhere quiet to go."
— Seidu Ramadhan Hussein, Architect · AIforGhana
Ready to Deploy

Procurement integrity,
visible by design

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