SHA-256 hashing
Every PDF is hashed on upload, client or server side. Modifying a single byte breaks the match instantly.
Proof you can check yourself.
Outsigner relies on standard cryptography and a complete audit trail, so the integrity of a signed document never depends on taking our word for it.
Audit trail certificate
Consolidates IP address, User-Agent, UTC timestamps, recipient verification, and explicit consent in a tamper-proof log.
Personal signing links
Each signer receives a unique link. Only a SHA-256 hash of the link is stored, and links expire after 30 days. Sending a link again invalidates the previous one.
Private storage
Documents are stored in a private bucket and served through short-lived signed URLs. Row-Level Security restricts every envelope to its owner.
Verify it yourself
This clause is sealed with SHA-256. Change a single character and the hash computed in your browser stops matching. Nothing leaves this page.
146 bytes, UTF-8
Sealed hash
0a1b0bc4c77d79ce
e6b55ce326fa45c2
6ebdb9202a8b6647
64f86635045768c3
Computed in your browser
0a1b0bc4c77d79ce
e6b55ce326fa45c2
6ebdb9202a8b6647
64f86635045768c3
Intact. The computed hash matches the sealed hash.
The audit trail certificate
Appended to every sealed PDF, it records who signed, when, from where and with what consent.
audit-trail_env_8f2a41c7.pdfSealed
- Envelope
- env_8f2a41c7
- Document hash (SHA-256)
- 468265f74e9f363ce469041d2a8c55a839282a3b7d9572dc7706d5584cc8992f
- Signer IP
- 203.0.113.42
- User-Agent
- Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 Safari/605.1.15
- Signed at (UTC)
- 2026-11-05T23:57:00Z
- Recipient verification
- Passed via signing link
- Consent
- Explicit consent recorded
Legal value
Outsigner produces simple electronic signatures backed by an audit trail: email-based identification, IP address, UTC timestamps and explicit consent. This level is used for most commercial agreements under eIDAS in the European Union and the ESIGN Act and UETA in the United States. Some documents require an advanced or qualified signature, or a handwritten one. This is not legal advice.
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