The round was led by M13 Ventures, Republic Labs, Gumi Crypto and an early Uber investor Shervin Pishevar.
The one-tap miner now supports ethereum, zcash, grin, and monero alongside BTC.
Mining innovator Balaji Srinivasan pivoted away from that business in 2017, but now believes the time is right for a home miner.
A new firm called Coinmine has announced a device aimed at enthusiasts who'd like to mine crypto, but don't want to learn a new technical skill set.