We seek a way to search "the internet" for the newest message signed by a given public key. A simple method is for the signed message to include a timestamp as part of the signed message, and the search engine parses such timestamps.
Vaguely similar previous wanting a search engine to handle cryptographic metadata.
More complicated methods include a cryptographically secure notion of time, perhaps similar to the Bitcoin hash chain.
Motivation was downloading software from sketchy sources.
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