How many core coins are there?
Could you please enlighten me on a matter that's been puzzling me for some time? I've been hearing a lot about cryptocurrencies, but I'm still not entirely clear on one aspect. Could you tell me, how many core coins are there? I've seen discussions about Bitcoin, Ethereum, and a few others, but I'm not sure if there's a fixed number or if it's constantly changing. Could you clarify this for me? I'm really interested in understanding the fundamental structure of this emerging field.