Crypto miners Riot Platforms and Bitfarms are locked in a corporate dispute, with Riot recently increasing its stake in Bitfarms to 13.1%. This comes after Bitfarms suggested a “poison pill” strategy to prevent Riot from acquiring more than 15% of the company. In other news, Tether plans to invest $1 billion in emerging markets, AI, and biotech over the next year. Ripple Labs has acquired digital asset custodian Standard Custody, a move that could help Ripple launch a US dollar stablecoin. Circle is adding support for the Solana blockchain, and Fireblocks has partnered with Coinbase to expand its trading services.