Independent Anchor Verification

Verify compliance evidence without contacting the vendor, installing software, or exposing sensitive data.

Executes entirely in your browser. No data is transmitted. No telemetry. View source to confirm.
Try it now with a real example

This demo anchor is pre-loaded. Click Verify Anchor below to see verification in action. Then change any number and verify again to see the tamper detection.

What is This?

When an organization monitors a compliance control, the SWT3 protocol records three numbers as evidence:

A
The Standard -- what the rule requires.
B
The Evidence -- what was actually measured.
C
The Context -- additional detail (often 0).

These numbers, plus the control identifier and a timestamp, produce a SHA-256 fingerprint. If anyone changes even a single number after the fact, the fingerprint will not match.

Verify an Anchor

Enter the anchor token and the evidence factors. This page recomputes the fingerprint locally and compares it.

Advanced: Paste JSON Bundles
Fingerprint Formula SHA256("WITNESS:" + tenant + ":" + procedure + ":" + A + ":" + B + ":" + C + ":" + timestamp_ms)[0:12]

Identical implementation across Python, TypeScript, Rust, C#, Ruby, Swift, and Go.

This tool performs independent cryptographic verification of SWT3 Witness Anchors. Verification confirms mathematical integrity of the fingerprint only. It does not constitute a legal opinion, audit finding, or compliance determination.