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Three pages, in order.

• What Permafrost is, and is not — the properties, each linked to the guide that exercises it.
• The testnet instance — what runs at testnet.permafrost.live, what is proven there, what is not, and when it is up.
• Quickstart — a bucket, a byte-equal round trip, a certified blob id, a multipart upload, a custody object incinerated to a certificate, and a keyless verify.

Then the Guides for each surface, the Reference for the exact routes, headers and limits, and the Explanation pages for why it is shaped this way.