https://www.ccn.com/researchers-unmask-anonymous-tor-users-tracking-bitcoin-transactions/
This is worth a read if you're interested in opsec. I think in the main 99% of people are fine, but this paragraph in particular stood out to me.
"Speaking of the latter, some of these 22 individuals completely neglected OPSEC (operations security) as they were careless enough to publicly disclose their full names, email addresses, locations, ages, and genders. One of them was found to be a teenager when dealing with the dark web service in question. There is a particularly strong reason for 18 of these people to start worrying as their transactions were tied to Bitcoin Talk. The thing is, this forum is being bombarded by subpoenas requesting users' registration details and other confidential information."
don't link your DNM identity - and fucking BTC addresses - to your real identity for fuck's sake
Also, don't use Bitcoin anymore.