@SanakTony Well you need to start from some trusted source that you already know is legit, and find links.
For example, if you think @peterktodd on Twitter is me, then this tweet links that identity to this Mastodon: https://twitter.com/peterktodd/status/1347891977342377984?s=20
Also, note how I'm self hosting. So if you start from the assumption that.the domain petertodd.org is me, then mastodon.petertodd.org is probably me too.
Looking at who follows who helps a bit. But I bet many haven't verified that...
@SanakTony See also: https://en.m.wikipedia.org/wiki/Web_of_trust
Same concept really.