Armorstack · ArmorSign
ArmorSign: tamper-evident e-signatures built by a cybersecurity company
ArmorSign is Armorstack's e-signature product, built to satisfy the U.S. ESIGN Act and UETA. Every signed document is sealed with a SHA-256 hash and recorded in an append-only audit log, and each signer gets a Certificate of Completion.
How it works
1. Upload your document
Drag in any PDF. No templates required, though you can save them.
2. Place fields and send
Drop signature, date, text, and checkbox fields anywhere, then email it to your signers.
3. Get a defensible record
Signers complete it on a branded page. Everyone gets a tamper-evident PDF and a verify link.
Why security teams like ArmorSign
Certificate of Completion
Every signed document gets a trust page with signer, consent, IP, timestamps, and the document hash.
Tamper-evident integrity
Documents are hashed with SHA-256 and recorded in an append-only, hash-chained audit log, so alteration is detectable.
Secure link signing
Signers get a single-use secure link and sign on a clean, branded page. No account required.
Public verification
Anyone with the verify link can confirm a document is authentic and unaltered, with no login and no PII exposed.
7-year immutable archive
Completed records are kept in object-locked storage for up to seven years.
Isolation and encryption
Per-account data isolation and encrypted transport.
Built for every agreement
Common uses
NDAs and contracts, sales agreements, HR and onboarding, consent forms, real estate, and vendor agreements and MSAs.
Frequently asked questions
Are ArmorSign signatures legally binding?
ArmorSign is built to satisfy the U.S. ESIGN Act and UETA by capturing intent, consent, and a tamper-evident integrity record. Each signed document includes a Certificate of Completion you can present as evidence.
Do my signers need an account?
No. Signers receive a secure single-use link by email and sign on a branded page.
How do you prove a document was not altered?
A SHA-256 hash of the signed document is recorded in an append-only, hash-chained audit log. Anyone with the verify link can confirm the document is authentic and unchanged.
How long are signed documents kept?
Completed records are stored in immutable, object-locked storage for up to seven years.
Is there a free trial?
Yes. ArmorSign offers a 14-day free trial with no card needed, and you can cancel anytime. See armorsign.ai for current pricing.