Sign agreements that stand
the test of time.
No account for your counterpart. Sign on any device. Independently verifiable — forever. Secure, blockchain-backed electronic signatures.
Document security for leading organizations.
Firma Sign doesn't just store documents. We create a cryptographically sealed digital proof that lives on a public blockchain. This means you can prove the integrity and existence of any document at any time in the future, without needing to trust us or any third party. It's the new gold standard for digital trust.
From upload to sealed proof in three simple steps.
Send in minutes
Upload any PDF. Add signers. Send a secure link. No registration required for signers, reducing friction to zero.
Sign without friction
Recipients sign on any smartphone, tablet, or desktop. Our interface is designed for speed and clarity.
Seal the proof
The moment everyone signs, the document is sealed and its cryptographic fingerprint is anchored on the blockchain.
Why does blockchain proof matter?
Encryption protects a document while it travels, but it says nothing about which version was signed once the file has been forwarded, renamed, and stored in multiple places. Firma anchors the fingerprint of the sealed PDF on a blockchain. This means the person holding the file can independently prove which bytes were signed long after the deal closed.
Sealed PDF
The PDF itself contains a cryptographic certificate embedded in the metadata.
Anchored
The document's hash is stored on a public ledger that can't be edited or deleted.
Impossible to Fake
Any change to a single pixel of the document invalidates the blockchain proof instantly.
Universal Verification
Verify any document years later using our open verification portal, independent of our system.
How often are agreements and payment instructions faked?
$2.7B
FBI STATS
Business Email Compromise losses involving faked documents in 2022 alone.
100%
VERIFICATION
Confidence that your signed documents haven't been modified since signing.
Often enough that a permanent seal earns its place. The FBI Internet Crime Complaint Center logged nearly 25,000 business email compromise complaints in a single year, with billions in reported losses—fraud that runs on documents looking genuine.
Agreements also leak value without forgery; businesses lose significant value in procurement contracts due to poor document tracking. Firma Sign stops this at the source.
Which documents do people sign with Firma Sign?
Employment Agreements
Onboard new hires securely and professionally with easy signing.
NDAs and Contracts
Protect your intellectual property with legally binding non-disclosures.
Board Minutes
Formalize board decisions with immutable records that last decades.
Offers and Quotes
Close deals faster with frictionless signature links sent to clients.
Shareholders Agreements
Critical governance documents secured by the highest digital standards.
Powers of Attorney
Legal authorization documents that require verifiable authenticity.
Simple, transparent pricing
Choose the plan that fits your needs
Core Plan
For individuals and freelancers
- Unlimited documents
- Blockchain anchoring
- Identity verification
- Email support
Business Plan
For growing teams and startups
- Up to 10 team members
- Custom branding
- Priority support
- Advanced audit logs
Frequently asked questions
About Firma Sign
No, your recipients can review and sign documents securely without ever creating an account, keeping the friction to an absolute minimum.
Yes, all documents are encrypted in transit and at rest. The cryptographic fingerprint (hash) is anchored on the blockchain without ever exposing the document content.
Anyone with the original document can drag and drop it into our verification portal. The system instantly verifies if the cryptographic hash matches the public blockchain ledger.
We currently support Ethereum, Polygon POS, and other EVM-compatible chains for anchoring document proofs.
Still Have Questions?
Our team is here to help! Get personalized answers about how FIRMA can support your business needs.
Contact Us