Which Country are you thinking of? Bitcoin and cryptocurrencies are legal in most Countries.

Let's focus on Bitcoin, here's a link to the legality of Bitcoin by Country/Territory: https://en.wikipedia.org/wiki/Legality_of_bitcoin_by_country_or_territory'

To summarize, here are the Countries where Bitcoin is illegal:

• Algeria
• Morocco
• Bolivia
• Ecuador
• Kyrgystan
• Bangladesh
• Nepal
• Cambodia
• Indonesia - illegal as a payment tool only, not illegal to own

Here's an image from the same source that illustrates legal by Country across the World.