Welcome to IC Sign
Secure digital file signing and verification powered by the Internet Computer
Secure Authentication
Login with Internet Identity for maximum security
Upload Any File
Support for any file type, up to 1GB
Digital Signature
Cryptographically sign files on the blockchain
Please login to start signing documents
Note: File verification is available to everyone without login
Verify Signed Documents
Check if a file has been digitally signed - no login required
Verify Signature
Upload a file to verify if it has been digitally signed on the blockchain
Upload File to Verify
Any file type, up to 1GB
How It Works
- •Upload any file to calculate its SHA-256 hash
- •System checks if signature records exist for this file hash
- •Multiple users can sign the same file - all signatures are preserved
- •If found, you will see all signers' names, file names, timestamps, LinkedIn profiles (if available), X profiles (if available), and Principal IDs (newest first)
- •Verification is available to everyone without login