Signatrust Sign · documents & approvals

Signatures you can verify — without uploading the document.

Drop a file. We hash it in your browser. We register the hash and seal each signature as a chained, Ed25519-signed Decision Receipt — the same proof engine that signs AI decisions. The file content itself never leaves your machine.

Hashed in your browser (SHA-256) Each signature is an Ed25519 receipt Anyone can verify with the file alone

Sign a document

Step 1 — pick a file. It is hashed locally, nothing is uploaded.

Verify a document

Drop the file you received. We hash it in your browser and look up any signatures recorded against that exact hash. The file is never uploaded.

One proof engine. Many surfaces.

Why we built Signatrust Sign on the same receipts as AI decisions

A signed contract and an AI decision are the same question with different actors: "who did what, when, under what authority — and can anyone prove it later without trusting you?". Sharing the engine means a single ledger, a single trust score, a single compliance report — across human and AI actors.

Zero custody

The document is hashed in your browser via the Web Crypto API. Signatrust stores only the SHA-256 hash and a human-readable title — never the file content.

Independently verifiable

Each signature is a Decision Receipt with an Ed25519 signature anyone can check against the published node key — no Signatrust account required to verify.

Same ledger, same score

Document signatures and AI decisions share the append-only ledger and feed the same Trust Score, Compliance report and Risk Profile.