Blockchain.com has raised $300 million in a Series C that values the London-based startup at $5.2 billion. Blockchain.com provides a cryptocurrency wallet that lets users buy, store and trade digital currencies. The round was led by partners of DST Global, Lightspeed and VY Capital. The company will use the funds for recruitment and to pursue potential acquisitions. Blockchain.com was valued at $3 billion with a $120 million round in February.