Sign

Sign,
with evidence.

Create a multi-party signing record around a document hash, built for auditability instead of opaque document storage.

Signing flow
01

Upload

Choose temporary encrypted upload, or sign a local hash without uploading the document.

02

Invite

Each signer gets a unique link to verify and sign.

03

Sign

Ed25519 signatures bind each signer to the document hash.

04

Anchor

The final signature record is anchored to Bitcoin via OpenTimestamps.

Useful for

Built for
audit trails.

Common signing patterns where hash-level evidence and signer metadata matter more than storing the full file.

Agreements

Founder agreements and board records.

Research

Research approvals and invention disclosures.

Partners

Partner documents where hash-level evidence is enough.

Audit

Independently verifiable signature metadata.

Signature evidence workspace

Create and track signing requests.

Upload temporarily or keep documents local, invite parties, and produce a verifiable signature package.

Local hash option Ed25519 signatures Bitcoin anchored record
01 / Signing request

New request

Create a signing package, choose delivery mode, and invite parties to sign cryptographically.

Drop file here or click to browse
Document encrypted at rest. You'll receive email confirmation when it's purged with a deletion receipt.
Advanced Options
Override the auto-generated download link with your own external document URL.

Signing Parties

Trusted identity requirements are unavailable until issuer integration is enabled.

You'll receive status updates and the final signature package
✓

Signing Request Created!

Invitations have been sent to all parties.

Bookmark this link to track signing progress

View Status
02 / Request ledger

History

Track signing requests created from this browser and reopen their status pages. Stored in this browser only.

No signing requests yet.

When you create signing requests, they'll appear here for easy access.

03 / Local identity

Browser keys

Manage your Ed25519 signing keys. Stored locally in your browser.

Key: Your private key is stored in this browser only. Export and backup your keys.