Document Verification
Generate SHA-256 cryptographic fingerprints for any document. Verify file integrity with on-chain attestation on Base L2. Files never leave your device.
Drop files here to generate SHA-256 hash
or click to browse — files never leave your device
Verify a Hash
Paste a SHA-256 hash to check if it matches a previously computed document fingerprint.
On-Chain Attestation
Base L2Register document hashes on the Base L2 blockchain for immutable, timestamped proof of existence. Each attestation costs less than $0.01 in gas fees.
1. Drop Your Document
Drag and drop any file. The SHA-256 hash is computed entirely in your browser — nothing gets uploaded.
2. Cryptographic Fingerprint
Each file produces a unique 256-bit hash. Even a 1-byte change produces a completely different fingerprint.
3. On-Chain Attestation
Optionally register your document hash on Base L2 blockchain for immutable, timestamped proof of existence.
Use Cases
Contract Integrity
Verify that a signed contract has not been modified after execution.
Audit Trail
Create tamper-proof records of financial documents and compliance reports.
Intellectual Property
Timestamp creative works to establish prior art and ownership.
Legal Discovery
Prove that evidence files have not been altered since collection.
Software Distribution
Verify downloaded installers match the publisher's original hash.
Academic Research
Attest dataset integrity for reproducible research and peer review.
Privacy by Design
MiOffice processes all documents in your browser using the Web Crypto API. No files are uploaded. No data leaves your device. The hash is computed locally using the same SHA-256 algorithm used by Bitcoin and TLS.
Part of MiOffice AI Office Suite — 66+ browser-based applications for PDF, Image, Video, and AI processing.