Digital currency exchange Coinbase has joined the unicorn club after raising $100 million in a Series D funding round led by venture capital firm IVP. Coinbase's total funding is now up to $217 million, giving it a valuation in excess of $1 billion, reports Finextra. Founded in 2012, Coinbase has followed bitcoin's soaring valuation and the rise of other cryptocurrencies such as Ethereum helping it exchange over $25 billion for customers. The new money will be used to beef up the engineering and customer support teams, open a New York office for professional trading platform GDAX, and invest in Ethereum network browser Toshi.