@zvava@twtxt.net There would be only one hash for a message. Some to be defined magic date selects which hash to use. If the message creation timestamp is before this epoch, hash it with v1, otherwise hammer it through v2. Eventually, support for v1 could be dropped as nobody interacts with the old stuff anymore. But I’d keep it around in my client, because why not.
If users choose a client which supports the extensions, they don’t have to mess around with v1 and v2 hashing, just like today.
As for the school of thought, personally, I’d prefer something else, too. I’m in camp location-based addressing, or whatever it is called. There more I think about it, a complete redesign of twtxt and its extensions would be necessary in my opinion. Retrofitting has its limits. Of course, this is much more work, though.