Sandbox · end-to-end · real SHA-256 · localStorage

See the whole loop live.

This sandbox runs the entire HashCare attestation + validation flow end-to-end in your browser. Submit content as any of five portfolio personas, cryptographically sign it (real SHA-256 via SubtleCrypto), watch it land in the registry, switch personas to peer-validate it, and see the append-only audit trail grow. Nothing leaves this browser — the registry lives in localStorage. Clear the state anytime to start fresh.

Scenario library · 100 use cases across the portfolio

Every scenario runs the full end-to-end flow: a persona submits content, real SHA-256 is computed, the artifact lands in the registry, and a second persona appends a signed validation. Click any card to run one. Or use Seed 50 random below to flood the registry and explore the audit-trail patterns at scale.

Filter:

To submit manually: (1) pick a persona below, (2) type or paste content, (3) click Sign & submit. Or just click any scenario above to auto-run the whole flow.

Acting as: — pick a persona below —

1. Submit an artifact

create

Artifact type Content to attest Metadata (one per line, key: value)

2. Append a validation

validate

Target artifact hash Validation kind

Rationale (public)

Artifact registry

0 artifacts

Hash (click to validate)	Type	Signed by	Signed at	Validations

No artifacts yet. Submit one above or click a preloaded scenario.

Event stream

No events yet. Submit an artifact or run a scenario.