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Verify a document
Upload a file (or paste a hash) to check integrity against on-chain seals. Verification is free.
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Upload Files
Drag and drop files or click to browse. We'll upload them for server-side hashing and check the blockchain.
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Verify by Hash
Already have a hash? Paste it below to check if it's sealed on-chain.
Tip: You can verify Merkle roots or individual file hashes.
Example: a1b2c3d4...
How Verification Works
- • If you upload files, they are sent to our API for server-side SHA-256 hashing and verification
- • We compute a Merkle tree of the file hashes
- • The Merkle root is checked against the blockchain
- • Prefer not to upload files? Use “Verify by Hash” instead
Need high-volume sealing?
Enterprise plans from £10 for 1,000 seals. Pay as you go or subscribe monthly.
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Office 365 integrationComing Soon
Automatic document sealing for SharePoint & OneDrive.
We're building a first-class Microsoft 365 integration: Graph webhooks, tenant isolation, and a SharePoint UI for one-click verification.
Until then, you can use the public API to seal and verify documents from any system.
Read the Office 365 roadmap →API endpoints
- POST https://api.provable.info /api/seal
- POST https://api.provable.info /api/v1/verify
- POST https://api.provable.info /api/v1/verify/upload
Old links still work: /verify and /office365.