OpenContract

Developer & Auditor Documentation

OpenContract Documentation

Architecture overviews, data schema specifications, smart contract addresses, and integration guides.

REST API Reference

Query procurements, download OCDS records, execute document verification, and access integrity metrics.

Explore APIs

OCDS 1.1 Data Model

Learn how planning, tenders, awards, contracts, amendments, and payment milestones map to OCDS.

View Schema

Document Verifier Guide

How in-browser SHA-256 fingerprinting verifies official PDF documents without uploading raw files.

Try Verifier

Integrity Principles

Understanding institutional limits, review signals vs findings, and responsible civic technology usage.

Read Principles

Smart Contract Reference

OpenContract deploys a tamper-evident event and document registry contract on Base Sepolia:

Network
Base Sepolia (Chain ID: 84532)
Registry Contract
OpenContractRegistry.sol
Contract Standard
Solidity 0.8.28
Foundry Toolchain
forge test --root contracts