LetsSeal

Prove files.

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Console’s review

· Reviewed by David Mytton

What we like

Built on an open standard to prove a file exists and is unaltered. Works via the web and through a CLI. Has a GitHub action. Can be self-hosted. Verification is through re-hashing and comparison, with a public transparency log.

Tradeoffs

Although you can verify offline, it still requires writing into a public transparency log (blockchain).

Is LetsSeal a fit?

Based on Console’s review published on 2026-07-30. Summary updated .

Who it’s for

Developers who need to prove file existence and integrity should consider this tool

Why consider it

It allows verification of file existence and integrity through re-hashing and comparison

Keep in mind

It requires writing into a public transparency log, even for offline verification

Console is a free weekly newsletter with short reviews of developer tools, covering strengths and tradeoffs. This review reflects Console’s assessment at publication on 2026-07-30. Features and limitations may have changed since the review date. Read our selection criteria and learn about Console.

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