Sadly or not the biggest communities for Counter Strike: Global Offensive betting are on Reddit and members there aren't often well versed into crypto and/or provable fairness. CS:GO gambling became popular a few years ago with case opening simulator sites, most of which were rigged anyway so it has a bad reputation. In terms of betting on matches, there's another huge Reddit comunity you should take into account also though. See here: https://www.reddit.com/r/csgobetting/
It's worth looking at Reddit as that's where the biggest CS:GO community is anyway and the site is also very friendly to discussion of betting unlike other gaming communities. Here's a nice "starter's guide" posted on Reddit to get you started:
https://telegra.ph/Betting-guide-101-06-06

The community itself is very active. Best to take part with an account. Don't get sucked into Reddit though.