So much good material in the capability security community, always way ahead of its time. It's heartening to see that at least some of it is trickling into standard industry practice.
Also, fwiw, the post didn't have the (2000) tag when I encountered the expired cert. Crypto isn't my strong suit, so my BS filter uses heuristic shortcuts. These shortcuts are often wrong.
It was also the inspiration for the Cosmos IBC protocol. https://github.com/cosmos/ics/blob/master/ibc/2_IBC_ARCHITEC...