Goldman Sachs may have breathed credibility into the digital crypto-currency Bitcoin after it co-lead a $50 million financing round in Circle Internet Financial, a Bitcoin wallet company. Despite widespread exposure, helped in no small part by its integral role in the online drug market SilkRoad, Bitcoin has failed to capture the public imagination. Not to mention the currency’s reputation for wild volatility..

Before Bitcoin’s rabid army of fans get too excited, it’s not the first time that Bitcoin companies have attracted venture capital. Earlier this year DFJ Growth led a $100m investment in Coinbase, another Bitcoin wallet. And we’re still paying for fags with bits of paper…