The checkable subset of Contubernium, served from the project's own domain: enough to
run a witness, check a
receipt offline, and implement the
specification independently against the conformance
vectors. Integrity: curl -sO https://contubernium.io/artifacts/SHA256SUMS && sha256sum -c SHA256SUMS
Everything here is source-available for verification, not open source: audit freely, verify freely, run a witness — those grants are permanent. Use beyond that is reserved; see the Verification License. The specification may be implemented independently, and the vectors test any implementation.
Settled design questions, with the rejected options and reversal conditions preserved.
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