It appears to be main instance according screenshots of the official app.[0] Nicknames would be formed as next: @{nickname}.bsky.social [0] https://apps.

It appears to be main instance according screenshots of the official app.[0] Nicknames would be formed as next: @{nickname}.bsky.social [0] https://apps.apple.com/us/app/bluesky-social/id6444370199 https://apps.apple.com/us/app/bluesky-social/id6444370199