Hi ! A while ago a mr gleason made a bridge between fedi and nostr. So the networks are linked (in a patchy way)
You can always make a fedi account on other instance

Also mitm is not applicable in your desvribzd case afaik. Your session would already be hijacked upon connecting to nerdica if there really was a mitm going on. 
 

https://soapbox.pub/blog/mostr-fediverse-nostr-bridge/ 

 Thanks, yeah I do use the Mostr bridge but a lot of servers block the bridge so I had s separate account for the occasional reply or something similar. Looking forward to Ditto soon.

 Probably not compromised, but mostly just extra caution since I wasn't signed in and page minus login keeps giving me an error.