BuildSeal

Prove any file in seconds.

Seal a file with cryptographic proof of existence, time, and integrity.

✓ Timestamped
✓ Independently verifiable
✓ No account required
Seal File Now — Drop or click to select
What this means
✓ Exact version recorded
✓ Trusted timestamp attached
✓ Future changes instantly detectable
✓ Anyone can verify it independently
File
Sealed At
Trusted Timestamp
► Advanced Technical Details
Proof ID
File Fingerprint (SHA-256)
Verify File

Verify a file or check a Seal ID.

📄 Drop file here or click to upload
or
✓ Tamper-proof ✓ Timestamped ✓ Private