Evidence is created from the protected content at the time of communication.
Provenance & VerificationMathematical proof.
Mathematical proof.
Independently checkable.
Every message and file sent through WSD comes with cryptographic evidence. Signed content fingerprints bind the exact content to the recorded sender identity and UTC time. Verification checks the signature and whether the content still matches.
A checkable record of the content you shared.
Check the recorded sender identity bound to the evidence rather than trusting appearance alone.
Compare the content with the signed fingerprint to detect a mismatch.
Under the proof
How provenance verification works.
Content prepared
An important message or document enters the protected exchange workflow.
Fingerprint created
A cryptographic hash is generated from the content.
Evidence signed
The digest is signed to bind supported origin and integrity properties to the content.
Recipient verifies
The recipient checks the recorded sender identity in the evidence and whether the content matches.
Independent checks
Supported documents can be checked offline when the original application is unavailable.
Reproduce the checks
Public protocol. Standard cryptography.
WSD signs deterministic JSON evidence using ECDSA P-256 and SHA-256. Once the organisation public key has been obtained from a trusted source, a third party can verify the evidence without the WSD application or original account.
Read the Cryptographic ProtocolWhat the evidence establishes
Origin and integrity—not truthfulness or intent.
WSD verification checks the supported identity and content properties bound to the evidence. It does not prove that statements inside a genuine document are factually correct, and it does not replace controls for compromised accounts or devices.
Sender evidence
Verify the recorded sender identity bound to the evidence.
Exact content
Verify the content against its signed fingerprint.
Integrity status
Detect when protected content no longer matches.
Reading the result
What does a successful check mean?
The file matches the signed evidence and the signature verifies against the trusted public key. The identity and time are the values recorded by WSD; the check does not independently establish a person’s real-world identity or provide a third-party timestamp.
Make your next important exchange verifiable.
Secure messages, protected files and evidence you can retain.
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