solid is dumb. and something that only makes sense for a comp sci from the 60s. everyone else who reads the project in simple english will see how dumb it is today.

in simple english: It is the dream project of whoever come up with cookies. basically cookies as first party data that you can download, upload, shared. All while having either the trouble of hosting a lot of infrastructure (just like the creators of email protocol thought everyone would do, ha!) or relaying all that info to a 3rd party like google or facebook. The nightmare scenario to everyone saying 3rd party cookies are bad.