U.S.-based cryptocurrency exchange Coinbase has just announced $300 million in new funding via a Series E round. : According to a blog post, Tuesday, the firm said that the Series E equity round was led by Tiger Global Management, while Y Combinator Continuity, Wellington Management, Andreessen Horowitz, Polychain and more also participated. By its own calculation, the major investment gives the company a "post-money valuation of over $8 billion" as part of its mission to drive adoption of cryptocurrencies and digital assets.