InkSeal Seal create proof packages
Timestamped proof packages · $2.00 per seal

Seal any file with cryptographic proof.

Drop a file, get an InkSeal v1.0 proof package with an RFC 3161 timestamp. Your file never leaves your browser — only the SHA-256 hash is sent to create the timestamp.

1

Drop your file

SHA-256 hash is computed locally in your browser. The file itself is never uploaded.

2

Pay $2.00

One-time payment via secure checkout. No account needed.

3

Download .proof

Get a portable proof package with manifest and RFC 3161 timestamp evidence.

Select file to seal

Drop a file here
or click to select. Your file stays in your browser.

What you get

  • A portable .proof package (ZIP)
  • Canonical manifest.json with SHA-256 binding
  • RFC 3161 timestamp response (tsr.bin) from FreeTSA.org
  • Verifiable with the InkSeal Verifier

Privacy guarantee

  • Your file never leaves your browser
  • Only the SHA-256 hash is transmitted
  • No account, no tracking, no storage
  • The hash alone cannot reconstruct your file

Evidence details

  • Timestamp authority: FreeTSA.org (free, non-qualified RFC 3161 service)
  • The timestamp binds the SHA-256 hash to a point in time
  • The .proof package is an InkSeal v1.0 base-format package
  • The verifier checks structure, hash match, and evidence presence

What this does not prove

  • Authorship or identity of the creator
  • Legal qualification or court admissibility
  • Regulatory compliance (eIDAS, ZertES, etc.)
  • Trust status of the timestamp service

These outcomes require additional evidence profiles, qualified trust services, and legal evaluation beyond the base standard.