Signed in minutes.
Provable forever.
LedgerSign seals every completed document with a cryptographic fingerprint on a public blockchain. Anyone can verify it. No one can rewrite it.
- Blockchain verification
- Tamper-evident audit trail
- ESIGN & UETA consent capture
- Encrypted storage
Anchored on-chain
sha-256 · 7f3a…e04d
Every signature leaves a
permanent fingerprint
A signed PDF from anyone else is just a file. A signed PDF from LedgerSign carries mathematical proof of what was signed, by whom, and when.
Fingerprint
sha-256(document)
The moment signing completes, the final PDF is hashed with SHA-256. That hash is a unique cryptographic fingerprint of exactly what everyone agreed to.
Anchor
tx 0x8c3d…f21a
That fingerprint is written to a public blockchain with a timestamp. Once anchored, the record is permanent. No one, including us, can alter it.
Verify
match ✓ verified
Anyone can re-hash the document and compare it against the on-chain record. If a single byte changed, the fingerprints won’t match.
Everything you need to sign
with confidence
Built for teams that answer to auditors, regulators, and courts, without slowing down the deal.
Blockchain Verification
Every completed document is hashed with SHA-256 and anchored to a public blockchain. The result is independently verifiable proof of integrity that no vendor, including us, can quietly change.
Verification certificate
sha-2567f3a…e04d- Status
- ✓ verified
- Network
- public ledger
- Record
- immutable
Tamper-Proof Documents
Change a single byte and the fingerprint no longer matches. Alterations reveal themselves instantly.
Multi-Party Signing
Sequential or parallel workflows, signing order, and automatic reminders for every stakeholder.
Audit Trails
Who signed, when, and from where. Every action is captured in a court-ready audit log.
Enterprise-Grade Security
Encryption in transit and at rest, role-based access, and secure presigned document delivery.
Security detailsAPI-First Platform
REST API and webhooks to fold signing and verification into your own product and workflows.
For developersFrom upload to on-chain proof
in five steps
A signing flow your counterparties will actually finish. Verification happens automatically at the end.
See the full tour- 01
Upload your document
Drag and drop a PDF, or start from a saved template. Your file is encrypted from the first byte.
- 02
Add recipients and fields
Place signature, date, and text fields exactly where they belong. Set signing order for multi-party agreements.
- 03
Share secure signing links
Each signer gets a unique, access-controlled link by email. No account required to sign.
- 04
Fingerprinted and anchored
When the last signature lands, the document is hashed and anchored to the blockchain automatically.
- 05
Download proof that lasts
Get the signed PDF and its verification certificate. Anyone can check it, at any time, without asking us.
Make your next signature
impossible to dispute
Start free and send your first blockchain-verifiable document in minutes.
No credit card required · Free plan includes 5 documents to try · Cancel anytime