# SPEAudit — Verifiable Integrity Certification

> Cryptographic proof that a file, document, or digital artifact existed in an exact state at a specific moment. Independent, vendor-neutral, and verifiable offline — forever.

## What SPE Is

SPEAudit is a stateless cryptographic proof engine. It generates tamper-evident bundles (ZIP) containing SHA-256 hashes and Ed25519 digital signatures that mathematically prove a file's integrity at a given timestamp.

- **VALID**: The bundle is intact. Evidence is internally coherent.
- **MATCH**: The file matches exactly what was certified. Byte-for-byte.
- **MISMATCH**: A single bit difference breaks the proof. SPE doesn't interpret — it detects.

## What SPE Is NOT

- Not a notary, not a certificate authority, not a legal signature.
- Not blockchain, not distributed ledger, not crypto-tokens.
- Not custody, not backup, not archival storage.
- Not a content quality or truth evaluator.

## Key Properties

- **Stateless**: SPE stores nothing. No files, no hashes, no user data. The ZIP is the user's sole custody.
- **Offline-Verifiable**: Proofs can be verified without any network connection, now or decades later.
- **Vendor-Independent**: If SPEAudit disappears tomorrow, every proof ever generated remains fully verifiable.
- **Cryptography**: SHA-256 Merkle proofs + Ed25519 digital signatures.

## Architecture

- **Backend**: Python / FastAPI, deployed on Railway.
- **Frontend**: Next.js (speaudit.com), deployed on Vercel.
- **Signing**: Ed25519 key pair. Public key published at /signing-info.
- **No Database Storage of Proofs**: Zero-knowledge architecture by design.

## Regional Portals

- English (US): https://api.speaudit.com/usa
- Japanese (JP): https://api.speaudit.com/jp
- Chinese (CN): https://api.speaudit.com/cn
- Swiss (CH): https://api.speaudit.com/ch
- Spanish (ES): https://speaudit.com

## Links

- Global Home: https://api.speaudit.com/
- Commercial App: https://speaudit.com/
- Technical Brief: https://api.speaudit.com/brief
- About & Scope: https://api.speaudit.com/about
- Public Observatory: https://api.speaudit.com/observatory
- Contact: contacto@speaudit.com

## Patent

US Provisional Application No. 63/930,786