Signim creates a tamper-proof certificate the moment you upload — sealed permanently on the blockchain so any dispute has a clear, undeniable answer.
Your file never leaves your device. We hash it client-side and anchor that fingerprint to the blockchain — permanently.
Choose any file — PDF, Word, image, audio, video — or paste any URL. Processed entirely in your browser. Nothing sent to our servers.
A cryptographic hash is created and anchored to the Constellation Network blockchain — immutable, decentralized, and tamper-proof forever.
Get a permanent certificate link you can share with clients, courts, or colleagues. Anyone can verify — no account needed.
Every certificate is permanent, shareable, and verifiable by anyone — no account required to verify.
Files are hashed in your browser. Only the fingerprint ever leaves your device — we never see your content.
Every fingerprint is permanently recorded on Constellation's DAG — immutable, decentralized, verifiable forever.
A permanent certificate link you can share with anyone. Anyone can verify — no account needed.
No setup. No integrations. Upload and your certificate is live on the blockchain in under a minute.
PDFs, Word docs, images, audio, video — if you can upload it, Signim can certify it.
Certify any web page as it exists right now. Preserve news articles, contracts, or any online content permanently.