ECO/CPO-DAG Contradiction Benchmark v1.0

A frozen, versioned, seed-reproducible set of synthetic GS1 EPCIS 2.0-style supply-chain events with labelled injected contradictions, for benchmarking contradiction detectors independently of any implementation. Version 1.0 contains 3,480 events over 500 subjects with 240 labelled contradictions (211 determinate-slash, 29 honest/bottom) spanning all five constraint classes (spatial, temporal, quantity, quality, regulatory), deterministic from seed 0. Includes events.jsonld (an EPCIS-2.0-style JSON-LD event list), labels.json (ground-truth contradictions), a MANIFEST with SHA-256 checksums, a standard-library scorer, and a reference detector. Accompanies the paper "ECO/CPO-DAG: A Contradiction-Based Accountability Layer for Adversarial Supply Chains." Traces are synthetic; generator parameters are recorded in the manifest.