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What is Attesto?
Attesto is a verifier-first evidence platform for AI and compliance workflows. It records important events as ordered evidence streams, returns receipts, creates portable verifier bundles, and lets external parties check integrity without trusting a private dashboard session.
What is an evidence stream?
An evidence stream is an append-only history for one tenant use case: for example one AI system, one policy, one product line, or one monitored process. Every event has a sequence number, a previous event hash, a payload commitment, and a resulting stream head.
That structure lets a verifier ask stronger questions than “does this event exist?” The verifier can also ask whether history was removed, inserted, reordered, replayed, or replaced after the fact.
Why verifier-first compliance matters
Traditional compliance tooling often creates reports that must be trusted because the system says so. Attesto is designed around the opposite posture: the report should carry enough evidence for a recipient to verify it independently.
- Receipts prove event acceptance and stream-head evolution.
- Windows and checkpoints summarize event ranges.
- Witness statements prove observed checkpoint progression.
- Fork evidence makes conflicting history visible.
- Anchors bind epoch commitments outside the application database.
- Verifier bundles package the material for offline inspection.
How the platform is organized
| Surface | Purpose | Primary users |
|---|---|---|
| Tenant dashboard | Systems, keys, streams, exports, webhooks, connectors, billing. | Operators and compliance teams. |
| Public API | Server-side ingest, Proofstream actions, public verification. | Developers and integrators. |
| SDKs | Python and TypeScript helpers for production event logging and verification. | Application teams. |
| Verifier bundles | Portable evidence packs that can be checked without backend access. | Auditors, counterparties, assurance teams. |
| Local Vault | Outbound-only customer edge relay, encrypted spool, source attestations, optional witness mode. | Enterprise customers. |
What Attesto does not prove by itself
Attesto provides evidence support for compliance controls. It does not certify legal compliance by itself, decide whether a business decision was correct, or prove that a source system supplied true data. It proves integrity, order, receipt, witness/quorum, anchor, and tamper-detection evidence for the material it receives.