Glowing cyan data streams across a dark server room
// what attesto does

An evidence layer that does not ask you to trust it.

Attesto is an evidence layer. It does not replace your logging; it makes it provable to a third party.

6 primitives Anchored Offline-verifiable
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// the pipeline

Six primitives. One deterministic pipeline.

Each step is independently inspectable and replaceable. Nothing about the design asks you to trust Attesto.

  1. 01 / 06

    Capture

    Ingest events from inference, infrastructure and operational systems.

  2. 02 / 06

    Canonicalise

    Normalise to a deterministic representation so the same event hashes the same way everywhere.

  3. 03 / 06

    Hash

    Commit each event to a content-addressed digest. The hash is the identity.

  4. 04 / 06

    Checkpoint

    Aggregate hashes into Merkle checkpoints at fixed intervals.

  5. 05 / 06

    Anchor

    Anchor checkpoints externally with public timestamps and optional chains.

  6. 06 / 06

    Verify

    Re-derive the proof offline. No call back to Attesto is required.

// architecture

Proofs you can carry. Data that never leaves.

A receipt is a small, self-contained artefact. Hand it to a regulator, an insurer or an opposing counsel — they verify it offline, against a public anchor, without ever touching your raw data.

Language-agnostic SDKs
Drop-in libraries for the runtimes you already ship — Python, TypeScript, Go, Rust, Java.
Bring your own storage
Evidence lives in your S3, Azure Blob or on-prem object store. Attesto holds proofs, not payloads.
EU-sovereign control plane
Hosted in the EU, operated under EU contracts. Optional notarised mirror across jurisdictions.
Zero-knowledge by default
We never see your raw events. Hashes and Merkle commitments only.
Cryptographic merkle tree visualisation
// receipt · anatomy

What a verifiable receipt looks like.

{
  "v": 1,
  "event_id":   "evt_2qZk9P…",
  "captured_at":"2026-03-04T09:12:47Z",
  "canonical":  "sha256:7f3a8b2c…b91c",
  "merkle_path":[
    "sha256:a14e…",
    "sha256:9d22…",
    "sha256:c0ff…"
  ],
  "checkpoint": {
    "root":     "sha256:0e1d…4a7b",
    "anchored": "2026-03-04T09:15:00Z",
    "anchors": [
      { "kind": "eu_ts_authority", "id": "QTS-NL-…"},
      { "kind": "public_chain",    "tx": "0x6ab1…"}
    ]
  },
  "verifier_url":"https://verify.attesto.eu/r/…"
}
  • canonical
    Deterministic byte representation of the event.
  • merkle_path
    Sibling hashes needed to reconstruct the checkpoint root.
  • checkpoint
    Anchored to EU qualified time-stamp authorities and an optional public chain.
  • verifier_url
    Anyone can reproduce the verification independently.
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