Blockchain document signing Sign it here.
Prove it anywhere.
LedgerSign is e-signature software that fingerprints every completed document and anchors that fingerprint on the Hedera public blockchain. Signers need no wallet and no crypto. Anyone can check the document later, even without us.
How does blockchain document signing work?
Signing works like any e-signature tool you have used. The blockchain step happens once, after the last signature, and asks nothing of your signers.
01
Sign as usual
Upload a PDF, place fields, set the signing order. Signers open a secure link, consent to electronic records, and sign from any device.
02
Fingerprint the result
When the last signature lands, the finished PDF is hashed with SHA-256: a 64-character fingerprint that changes completely if a single byte of the file changes.
03
Anchor it on Hedera
The fingerprint is written to a Hedera Consensus Service topic. The ledger records it with a consensus timestamp that no one, including LedgerSign, can edit afterwards.
04
Verify any time
Anyone holding the PDF can re-hash it and compare it with the anchored value, using our free verify tool or any SHA-256 tool plus a public explorer such as HashScan.
What goes on the blockchain?
Nothing from the document's content is published. Here is where each part of a signed document lives.
| Part of the signed document | Where it lives |
|---|---|
| The document itself (the PDF) | Encrypted storage. Never written to the blockchain. |
| SHA-256 fingerprint of the final PDF | Anchored on Hedera, in a public transaction. |
| Signing metadata for that completion | Included in the same anchor message. |
| Audit trail and consent records | In LedgerSign, and summarised on the Certificate of Completion. |
| Hedera transaction id | Printed on the Certificate of Completion, so anyone can look it up. |
Blockchain e-signature vs. an ordinary e-signature
Both are legally binding for the same reasons. The difference is where the evidence lives, and who you have to trust to check it.
| What you need to prove | Ordinary e-signature | Blockchain e-signature |
|---|---|---|
| Who signed, and that they consented | An audit trail kept by the vendor | The same audit trail, plus a public anchor |
| The document has not changed since signing | Usually the vendor's seal or audit record | Re-hash the PDF and compare it with a public ledger record |
| When it was completed | A timestamp in the vendor's records | A consensus timestamp on a public ledger |
| Checking it without the vendor | Depends on the vendor's certificates and records staying available | Yes: the hash and the ledger record are all you need |
| Who the signer really is | Not proven by the signature alone | Not proven by the blockchain either: identity comes from the signing process |
Why anchor on Hedera?
Hedera is a public ledger governed by a council of large organisations. Transactions reach finality in seconds and fees are fixed in US dollars at a fraction of a cent, which makes anchoring every completed document practical rather than a premium extra.
Its records are readable by anyone through public mirror nodes and explorers such as HashScan. That is what lets a court, an auditor, or a counterparty check a document without an account with us.
Why LedgerSign anchors documents on HederaIs a blockchain-signed document legally binding?
Yes, for the same reasons any e-signature is. In the United States the ESIGN Act and UETA give electronic signatures the same effect as ink when the signer consents and intends to sign, and LedgerSign captures that consent before anything is signed. In the EU, eIDAS says an electronic signature cannot be denied legal effect solely because it is electronic.
The blockchain anchor does not make a signature more legal. It makes it easier to prove: that the document is the executed version, and when it was completed.
Are electronic signatures legally binding?Questions people ask
Do my signers need a crypto wallet or tokens?
No. Signers open a link, consent, and sign in the browser. LedgerSign pays the Hedera fee and handles the anchoring. Nobody needs a wallet, a blockchain account, or any crypto knowledge.
Which plans include blockchain anchoring?
Anchoring on Hedera is included on the Business plan and above. The Free and Growth plans cover the signing workflow without the anchor. See pricing for the full comparison.
Can I verify a document years from now?
Yes. Verification needs only the PDF and the Hedera transaction id from its Certificate of Completion. The check does not depend on LedgerSign being around: the record lives on the public Hedera ledger.
What happens if someone edits the PDF after signing?
Any change, even one character, produces a completely different SHA-256 fingerprint. It no longer matches the anchored value, so the edit is detectable.
Is the document stored on the blockchain?
No. The PDF stays in encrypted storage. What is written to Hedera is an anchor message with the document's fingerprint and the signing metadata for that completion. The document's contents are never published.
Send your first
blockchain-signed document
The free plan includes five documents to try the signing workflow end to end. Anchoring on Hedera starts on Business.
No credit card required · Free plan includes 5 documents · Cancel anytime
Page updated September 29, 2026