Add Perfect Audit Crime Challenge (demo row + Challenge dataset group)

README.md

@@ -27,6 +27,7 @@ train, benchmark, and stress-test audit, fraud-detection, and graph-ML systems.
 | 🔗 [**Accounting Network Explorer**](https://huggingface.co/spaces/VynFi/accounting-network-explorer) | Interactive ISO 21378 account-class flow graph — filter by business process, fraud, anomaly, amount, top-N; drill from Level-2 classes into Level-3 sub-classes. |
 | 📊 [**Process Mining Demo**](https://huggingface.co/spaces/VynFi/process-mining-demo) | pm4py directly-follows graphs, variants, and statistics on the supply-chain OCEL 2.0 event log. |
 | 🗂️ [**Data Explorer**](https://huggingface.co/spaces/VynFi/data-explorer) | Browse and inspect the VynFi synthetic datasets. |
+| 🕵️ [**Perfect Audit Crime Challenge**](https://huggingface.co/spaces/VynFi/perfect-audit-crime-challenge) | Two-track community leaderboard — flag the planted fraud in synthetic GLs and help map the *detectability frontier*. **Track A** (ledger only): the *mimetic perfect crime* — fraud drawn from the ledger's own normal distribution — is provably uncatchable. **Track B** (ledger + ISA-520/505 evidence): it becomes catchable. Upload a submission → PR-AUC + per-observability recall on held-out labels. |
 
 ## 📦 Datasets
 
@@ -56,6 +57,11 @@ train, benchmark, and stress-test audit, fraud-detection, and graph-ML systems.
 | [vynfi-ocel-manufacturing](https://huggingface.co/datasets/VynFi/vynfi-ocel-manufacturing) | Manufacturing OCEL 2.0 event log — production-order lifecycle + quality inspections. |
 | [vynfi-supply-chain-ocel](https://huggingface.co/datasets/VynFi/vynfi-supply-chain-ocel) | 5-company manufacturing supply-chain OCEL 2.0 event log for cross-process mining. |
 
+**Challenge**
+| Dataset | Highlights |
+|---|---|
+| [perfect-audit-crime-data](https://huggingface.co/datasets/VynFi/perfect-audit-crime-data) | The ledgers behind the [Perfect Audit Crime Challenge](https://huggingface.co/spaces/VynFi/perfect-audit-crime-challenge) — 3 multi-entity GLs across two tracks (ledger / ledger + ISA-520/505 evidence) with a planted *mimetic perfect-crime* family; labels held out for scoring. |
+
 ## 🤖 Models
 
 | Model | What it is |