SK SAKK
Document Integrity Platform

Cryptographic certification.
Zero server retention.

SAKK issues ECDSA-signed certificates for any document, embeds a verifiable QR seal, and logs every operation to an immutable SQLite audit ledger—without storing a single byte of your files.

< 15ms Signing latency
0 B Files retained
secp256r1 Key curve
SHA-256 Hash function
Open Workspace View Audit Log

Workspace

Live

Authentication required
to issue certificates.

Issue
Issue Certificate
Drop file or click to select
PDF, image, or any document — not stored server-side
Drag the QR badge to your preferred position, then click Issue.
Signing document...
Certificate issued. ECDSA signature verified.
QR seal
Download QR
Hash
Signature
Issued at

Note: The hash above represents the original file before stamping. Use the QR scanner to verify a stamped PDF.

Verify
Verify Document Integrity
Drop the original document here
Verifying signature...
Hash
Scan
Verify Cryptographic Seal
Drop a QR image or stamped PDF
PNG / JPG / PDF — all formats supported
Decoding seal...
File
Issued
Hash
Audit Trail
SQLite — last 15 records
# File SHA-256 (truncated) Signature Timestamp