// Evidence pipeline
Every event.
One proof layer.
Proofstream is the evidence pipeline at the core of Attesto 2.0. It receives events from any source, processes them into tamper-evident proof objects, and makes each one independently verifiable.
// What Attesto proves
Every category of digital event.
AI decisions
Model inference, prompt hash, output hash, model version, human override, policy check, risk classification.
Application activity
API call, process step, approval, access event, configuration change, business process step.
Cyber incidents
Detection, escalation, containment, remediation, approval receipts, recovery milestones.
Data movement
Transfer event, location claim, storage commitment, processing record, deletion proof, retention evidence.
Digital content
C2PA manifest, media hash, edit chain, publication proof, distribution record.
Audit activity
Review event, control evidence, auditor receipt, policy check, compliance milestone.
// How to connect
Four ways to submit events.
SDK
Embed the Attesto SDK directly in your application or AI system to submit events programmatically.
REST API
Submit events via HTTP POST from any platform, script, or system that can make web requests.
Connectors
Install marketplace connectors that forward events from existing tools into Proofstream automatically.
Batch
Import structured batches of historical records or high-volume event streams via bulk upload.
// Full Proofstream lifecycle
From event to independently verifiable bundle.
Event
A system action is submitted to Attesto via SDK, API, or connector.
Receipt
A signed receipt is returned immediately — the first layer of cryptographic verification.
Window
Events are grouped into closed windows with inclusion proofs and window commitments.
Checkpoint
Stream-head commitments capture cryptographic snapshots of the full evidence stream state.
Witness
Independent witnesses attest to checkpoint validity. Conflicting histories produce fork evidence automatically.
Anchor
Checkpoint roots are anchored externally, creating a time-stamped commitment independent of Attesto.
Bundle
A portable Truth Package is assembled: receipts, windows, checkpoints, witness statements, and anchors in one verifiable archive.
// Witness plane
No single party controls your evidence integrity.
The witness plane ensures independent attestation at every checkpoint. When evidence histories conflict, fork evidence is generated automatically — machine-readable proof of what happened, not a hidden dispute.
Single quorum
One witness must attest for checkpoints to be accepted. Simpler configuration for internal or low-risk streams.
Supermajority quorum
Two of three witnesses must agree. Stronger fork detection for regulated or high-stakes evidence streams.
// Fork detection
Conflicting histories become evidence.
If a system attempts to rewrite its evidence history, the witness plane detects the conflict. Instead of a silent disagreement, Attesto generates fork evidence: machine-readable proof of the conflict, who reported it, and when.