Cryptographic proof for digital artifacts.

No blockchain. No ledgers. WTF?

Proof should be a property of creation, not verification.

Try ProofStudioDocumentation

How it works

Three steps, one proof. Your file never leaves your device.

01

Drop your artifact

Drag any file into ProofStudio. It's hashed locally in your browser — nothing is uploaded.

02

Commit

The hash is sent to a trusted execution environment where it's bound to a nonce, counter, and timestamp.

03

Receive proof

You get back a portable proof object — a signed JSON that demonstrates this artifact existed in this exact form at this moment.

Portable, verifiable proof

Every proof is a self-contained JSON object. It includes a content hash, commit metadata, a cryptographic signature, and an optional hardware attestation report. Anyone can verify it independently.

Content-addressed— SHA-256 hash binds the proof to specific bytes.
Timestamped— Independent RFC 3161 timestamps from trusted authorities.
Hardware-attested— AWS Nitro Enclave attestation proves the execution environment.
Device-authorized— Optional biometric authorization ties proof to a specific device key.
{
  "version": "occ/1",
  "artifact": {
    "hashAlg": "sha256",
    "digestB64": "u4eMAiu6Qg..."
  },
  "commit": {
    "nonceB64": "gTME79qH3f...",
    "counter": "277",
    "time": 1741496392841,
    "epochId": "a1b2c3d4..."
  },
  "signer": {
    "publicKeyB64": "MFkwEwYH...",
    "signatureB64": "MEUCIQD..."
  },
  "environment": {
    "enforcement": "measured-tee",
    "attestation": {
      "format": "aws-nitro"
    }
  }
}

Prove anything

Any file or computation result that needs verifiable proof of existence and integrity.

AI Outputs

Prove model responses, generated images, and predictions came from a specific boundary at a specific time.

Software Builds

Prove a build artifact was produced by a specific CI/CD pipeline inside a measured environment.

Media & Journalism

Prove a photo or document existed in its current form at a specific moment — before edits, before distribution.

Scientific Data

Prove sensor readings and instrument output existed at capture time with sequence integrity.

Compliance & Audit

Produce tamper-evident records where any modification breaks the proof chain.

Agent-to-Agent

Pass proofs between systems so each can verify data integrity without trusting the transport.

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OCC — Origin Controlled Computing

ProofStudio is built on the OCC protocol — a cryptographic proof system where proof is produced by the commit event itself. If the proof exists, the commit happened. If it doesn't, it didn't.

Read the protocol documentation →

Try it now

Drop a file, get a proof. Runs in your browser, verifiable by anyone.

Open StudioAPI ReferenceGitHub