Dash is a popular open source, peer to peer (P2P), decentralized cryptocurrency that offers a number of advantages over <abbr rel="tooltip" title="Currency that a government has declared to be legal tender, but is not backed by a physical commodity. Bitcoin has been criticized for its use in illegal transactions, its high electricity consumption, price volatility, thefts from exchanges, and the possibility that bitcoin is an economic bubble. Bitcoin has also been used as an investment, although several regulatory agencies have issued investor alerts about bitcoin.