Bitcoin mining firms are deepening their financial war chests as speculation arises around potential spot bitcoin ETF decisions early next year.

Twitter co-founder and longtime bitcoin bull Jack Dorsey led a $6.2 million seed round in Mummolin, the company supporting the launch of a decentralized bitcoin mining pool called OCEAN. 

Meanwhile, the Canadian mining company Bitfarms closed a private $60 million share sale with US institutional investors. 

OCEAN is a non-custodial mining pool, meaning miners can lend computing power with ASIC interfaces and receive rewards directly from the bitcoin network without the company taking custody of the mined bitcoins. 

“It went back to the…

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