TIL BuyVM offers Anycast VPS's: https://buyvm.net/anycast-vps/
Very tempted to find an excuse to use that. 😂
Anycast works fine for short-lived TCP connections, so it'd probably work fine for scaling up OpenTimestamps infrastructure. I'd really like to avoid being vulnerable to DoS attack, as I've got competitors that are straight up scammers. Currently it wouldn't take that much effort DoS attack OTS into the ground. Wouldn't take much to fix either! But better to be prepared in advance if it can be done cheaply.
So I'm thinking a good setup for DoS attack resistance would be to run the calendar servers themselves on reasonably fast machines to answer calendar db queries quickly (esp cache misses), and maybe use anycast'd on the front end w/ submitted digest aggregation to limit the geographical impact of a DoS attack.
The latter might not be relevant: a fast Rust calendar implementation can probably serve more bandwidth than I can afford on a single reasonably fast box. 😂 Modern hw is amazing.