-"A tangent: it'd be neat if there was a company that let you register a set of these tests to enable the release of something like a one-time private signing k

-"A tangent: it'd be neat if there was a company that let you register a set of these tests to enable the release of something like a one-time private signing key held in escrow. " I think I smell a start-up. Seriously. There will be some difficult questions to address, like how to finance an indefinite escrow and still charge a price low enough that you can draw customers and how to store the escrow in such a manner as to make it impractical for TLAs to bulk mine the whole thing but I think you have a good idea.