We have tags for cryptocurrency and bitcoin. Presumably, the bitcoin tag would be used for questions that are specific to Bitcoin only, but not to any other cryptocurrency. I understand that Bitcoin is about as old as our site, and when the tag was created, there was no other cryptocurrency. However, in the context of our site, I would think that anything on-topic here regarding cryptocurrency (taxes, investing, etc.) should apply to all cryptocurrency. Any question that is specific to Bitcoin and not to the other cryptocurrencies (mining, wallets, network, etc.) is probably not on-topic here (but may be on-topic on bitcoin.SE).
Should we make bitcoin a synonym tag for cryptocurrency?