@simon_brooke @yetiinabox
FWIW, Im a fan of #GeminiProtocol
It has a minimalist style, including for URIs
So for example a link would function like this
=> https://example.com This is a comment
The norm to add date information is this
=> gemini://example.com 1970-12-31 This is a comment
As such one could provide a hash of a page and put the reference with the date and as the comment.
Similar have been proposed for the opening hash of a file to chain this stuff