The blockchain is open source software, and anyone can create a currency based on it. That's why you have dogecoin, litecoin, etc. However, in order for a curre

The blockchain is open source software, and anyone can create a currency based on it. That's why you have dogecoin, litecoin, etc. However, in order for a currency to be valuable, people have to use it, and bitcoin is the only cryptocurrency that has really taken off.