A canary is a message that is regularly signed cryptographically by an admin indicating the market/site is under his control and he is not incarcerated.
If the canary expires and is not replaced, then the site should not be visited.
With the Canary you can check when the admin of the market last time online and see that he is still the market under his control has! this is to prevent the LE a market takes over!
Well the function is not quite difficult! A PGP key is needed! With a PGP signature! It is a message with a sign of life and the date often inserted! This message is then signed by PGP this can then be checked by people or by oneself whether it is the authenticity!
i don't know how long you've been active! but every one of these developments helps make this place a little safer! and when you go through things like hansa market! you'll be thankful for things like this!
I love it when I have three options: good morning sativa puffs followed by some 50/50 hybrid strain after lunch. And then some indica dominant strain few hours before bed (used to love Granddaddy Purple for this purpose but cant get it nowhere since a year or so).