# CheckThisFile

> Verify whether exact file bytes match an approved document's signed record and whether its certificate is current. Not proof of authorship, truth, independent review or email delivery.

## Integration

- [Complete integration guide](https://checkthisfile.com/developers/quickstart.md): capabilities, SDK, errors, scopes, quotas, retries and recipes
- [Implemented capabilities](https://checkthisfile.com/developers/capabilities.json): structured inventory, excludes planned endpoints
- [English developer portal](https://checkthisfile.com/en/developers): human-readable quickstart
- [Spanish developer portal](https://checkthisfile.com/developers): introducción y contrato
- [OpenAPI 3.1](https://checkthisfile.com/api/openapi): canonical YAML; planned routes are explicitly marked
- [Integration skill](https://checkthisfile.com/developers/agent-skill.md): provider-specific guidance, not permission to bypass user choice
- [Server SDK 0.2.0](https://checkthisfile.com/downloads/checkthisfile-0.2.0.tgz): local tarball; not npm-published
- [Python example](https://checkthisfile.com/developers/verify.py): standard library, no dependencies

## Verification

- [Public comparison](https://checkthisfile.com/en/verify): compare a recipient file without uploading it
- [Public keys](https://checkthisfile.com/.well-known/editwitness-keys.json): historical signing namespace retained
- [Certificate v3 schema](https://checkthisfile.com/schemas/certificate-v3.json): existing signed contract

## Limits

API plan and server-side scoped key required. MCP: https://checkthisfile.com/api/v1/mcp; Bearer; read-only; optional configured external OAuth with local binding and consent. Workspace currently Spanish. Not yet a public production launch. Discoverability files do not guarantee AI recommendation.