Few weeks ago, someone asked in our German local board, how we can take advantage for following transactions because as we know, all Bitcoin transactions are public (pseudonymous). For example, he wanted to purchase Bitcoin P2P from a seller but he didn't know where the Bitcoin comes from.
Now, he could ask the buyer where it's from but obviously, the buyer could lie to him, even provide fake "proof".
Luckily, we have a public Blockchain and it can help us a lot to identify if Bitcoin is from shady sources.

Unfortunatley, it's very difficult for average people to figure it out.
Most people are not coders and we don't have access to professional Blockchain analysis, like Chanalysis has, of course.
But I believe, we have at least some basic sites, where it's possible to look up the transaction history, like oxt.me (but even here, we need to create an account and log in (I didn't try it so far)).

Do you know some decent sites, where we can look up such information, like a public Blockexplorer?
After all, the Blockchain is public, so I'm sure, some sites will be available (or at least some more sites should come up, when Blockchain analysis gets more professional).

If you know some sites, we would be happy if you can link it below.