Let's Seal

Open standard and tool for proving any file is real, unaltered, and sealed by a date.

Servicefree

An open standard and free tool for proving that files are authentic, unaltered, and sealed to a specific date. It provides a way to attach verifiable content credentials and timestamped digital signatures for publishers, developers, archivists, and organizations that need tamper-evident proof of file provenance.

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Full match profile

Behind the summary, Matchbox keeps a richer profile of Let's Seal - the signals our matcher actually reads to decide when to surface it. It stays private; claim the listing to see and control it.

Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

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