Evidence connected.
History traceable.
Integrity verifiable.
Evidence Link is a cryptographic evidence service for any record that has to hold up. Inspections, audits, repairs, approvals, assessments: whatever the work is, every event is sealed the moment it is recorded, chained to the event before it, checkpointed with a signature and a Bitcoin anchored timestamp, and exportable as one file that anyone you authorize can verify independently.
What it keeps
A subject can be anything with a history worth proving: a website, a building, a vehicle, a device, a property, a process. Evidence Link keeps the same three things for all of them.
A timeline that cannot quietly change
Every event records who acted, what happened, when the source says it happened, and when Evidence Link sealed it. History is append-only: corrections arrive as new events, never as edits.
Originals, preserved byte for byte
Reports, photos, exports, and documents are stored as originals under their own fingerprints. What was sealed is exactly what comes back.
Before and after, proven
Versioned snapshots describe the state of a subject at each step. The change between any two snapshots is computed, not narrated: what appeared, what resolved, what is still open.
The cryptography
No proprietary black box. Evidence Link is built from standard, publicly understood methods, applied in a strict order.
SHA-256 fingerprints
Every artifact is hashed with SHA-256 and stored under its own digest. Change a single byte and the fingerprint no longer matches, so altered evidence identifies itself.
Canonical manifests
Each event carries a manifest of its artifacts, serialized as canonical JSON: sorted keys, fixed encoding. The same content always produces the same hash, on any machine, at any time.
Hash chains
Every event's hash is computed over the event itself plus the hash of the event before it, per subject. Delete, reorder, or rewrite an entry and the chain breaks at exactly that point.
Signed checkpoints
The head of every chain is periodically signed with Ed25519, and copies of the signed checkpoints are anchored outside the database. Even replacing the whole database cannot quietly rewrite a signed history.
Offline verification
Every export ships with a small, dependency-free verifier. Counsel, an auditor, or an independent expert can recompute every fingerprint, link, and signature locally. No account, no network, and no trust in Evidence Link required.
Bitcoin anchored timestamps
Every signed checkpoint hash is submitted to the Bitcoin blockchain through OpenTimestamps. Only the hash ever leaves our servers, never the evidence. Once the anchor confirms, anyone can prove the checkpoint existed by that block time, without taking our word for it.
The Case File
One download holds the originals, the full event history, the state snapshots and their diffs, attestations, the signed checkpoint, and the verifier. Helpful and adverse records alike, in full.
In production: Outfielder
Evidence Link powers the record behind Outfielder, where it seals accessibility assessments, fixes, and verifications for businesses, and the public face of each record is a status page at AAccessibility.com. Same ledger, same methods, ready for the next field that needs its history to hold up.