Hash-locked approval sets
Every approval is bound to the exact bytes of the files it covers.
Release-gate SaaS · Duskel product / In production · invite-only
Cairn.
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The product
A release gate that stops engineered-to-order manufacturers from building the wrong revision of an approved design.
The challenge
Built around
the hard part.
Approvals in email and shared drives can drift away from the files they covered, leaving production exposed to an expensive revision mistake.
LaravelReactMulti-tenantSigned URLsAudit trail
No-login customer sign-off
A signed link removes customer friction while preserving attribution.
Automatic void and production block
Any post-approval file change invalidates the release before it reaches the floor.
The outcome
The work kept
working.
Cairn creates a verifiable evidence trail and makes the approved revision an enforced production constraint.
See all work ↗Start with a paragraph, a Figma, or a Loom.
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