The canonical endpoint Trezor Suite itself uses is btc.trezor.io
(unnumbered). The numbered mirrors (btc1..btc5) resolve to the same
Cloudflare-fronted backend pool but aren't enumerated in Suite's
defaults, so matching Suite's choice is the lowest-surprise option.
Existing users keep their persisted blockbookBaseUrl; only the
out-of-the-box default and docstrings change.
Alex Gleason
881ddf3c81