Ask HN: Is there a cryptocurrency-centric version of Hacker News?

Probably r/CryptoCurrency could be considered one.

Reddit is the place for crypto discussions. Though you may want to avoid coin specific subreddits like r/Bitcoin etc. as they don't tolerate any discussion negative to the respective tokens but more general subreddits like r/Cryptocurrency (as @jxub mentioned) and r/Blockchain are good places to start