I quite like technologies / ideas / concepts like Merkle-Trees, DHT's, P2P and have them on my CV. Those companies that know what they're doing engage me on these topics. When somebody talks about blockchain I usually leave the room though. When I was still on LinkedIn I made the mistake to have blockchain in addition to those mentioned above in my profile and got bombarded with ICO scams and people adding me with "blockchain" in their titles. (the type that used to do SEO or growth-hacking before but have no idea about anything). Removing blockchain from the list dramatically reduced these requests.

Although I can't say if it was just that or whether I simply exhausted the pool of those that harassed me by trolling them back. Here is some fun I had: I made an extra 400-600 every other month by emailing people who spammed me with ICO crap. They always first connected on LinkedIn then exported their data to mailchimp abusing the Mailchimp ToS (and back then upcoming GDPR too) I sent them a requests for immediate removal from their system and an invoice. This required a little research on my part on the type of spam e.g. by filtering for those in my legal jurisdiction and getting names of people involved in their scam ... The invoice was a modest fee just above €100,- to reimburse me for my time wasted. I also attached all smtp headers, accompanied by a strongly worded letter that it would be handed over to my lawyer if the money wasn't paid within 7 days. The invoice came from an EU based Ltd operating under the same jurisdiction (no point in going after companies weak EU jurisdictions with very long legal process, ... but France, Germany, Holland, etc worked well). Only 2 of the spammers didn't pay up immediately and they got referred to my lawyer which then ensured I got the money within a month and without further fights. It did cost me around ~30-40 mins in time spent (some considerably longer but this was on average) to prepare the invoice and do the actual research on the people behind the corp (little bit of social engineering with those that seemed to be faceless and dangle some investment did the trick). It wasn't really a way of earning money but I enjoyed the extra thrill and exposing these idiots. Good times and great fun to waste a little bit of my time with figuring out how they worked (or how big they were compared to how big they claimed their operation was on social media ...)