Guide
How to Verify an Electronic Signature
Every Signbee document includes a SHA-256 hash that proves the document hasn't been modified.
Steps
- 1
Open the signed PDF and find the certificate page
- 2
Note the SHA-256 hash on the certificate
- 3
Use the verification link or hash the document content yourself
- 4
Compare hashes — if they match, the document is untampered
- 5
The certificate also shows who signed, when, and from where
Try it with curl
curl -X POST https://signb.ee/api/send \
-H "Content-Type: application/json" \
-d '{
"content": "# Your Document\n\nContent here...",
"senderName": "Your Name",
"senderEmail": "you@email.com",
"recipientName": "Recipient",
"recipientEmail": "recipient@email.com"
}'Legal validity
Electronic signatures are legally binding under the ESIGN Act (US), eIDAS Regulation (EU), and Electronic Communications Act (UK). Every Signbee document includes a SHA-256 tamper-proof certificate.
More details
Every Signbee-signed document includes a certificate page at the end with complete verification information. This page is cryptographically bound to the document — if anyone changes even one character, the hash won't match.
What the certificate page contains: - SHA-256 hash: A unique fingerprint of the document content - Signer details: Name, email, and IP address of each signer - Timestamps: Exact date and time each party signed (UTC) - Verification method: How each signer's identity was confirmed - Document ID: Unique identifier for the signing session
How to verify: 1. Visual check: Open the PDF and review the certificate page 2. Hash verification: Compute the SHA-256 hash of the document content and compare it to the certificate hash 3. Signer verification: Confirm the signer's email and name match 4. Timestamp verification: Check that the signing date matches your records
Why SHA-256 matters: SHA-256 is a cryptographic hash function used by banks, governments, and blockchain systems. A single change to the document produces a completely different hash — mathematical proof the document hasn't been altered.
Frequently asked questions
What is a SHA-256 certificate?
SHA-256 is a cryptographic hash function that creates a unique fingerprint of the document. If even one character changes after signing, the hash won't match — proving tampering.
Can I verify a signature without special software?
Yes. The certificate page is embedded in the PDF itself. Open it in any reader and review signer names, timestamps, and the SHA-256 hash.
Related resources
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