According to @EmberCN, BitMNR deposited 74,880 ETH, approximately USD 219 million, into Ethereum PoS staking about 50 minutes before the report. According to @EmberCN, this is BitMNR's first staking transaction and the firm currently holds 4.066 million ETH. Based on the 3.12 percent APY cited by @EmberCN, the newly staked 74,880 ETH implies roughly 2,336 ETH in annual rewards; fully staking the reported 4.066 million ETH would imply about 126,859 ETH in yearly rewards. Using the per-ETH valuation implied by @EmberCN's figures, roughly USD 2,924 per ETH, those rewards equate to roughly USD 6.8 million for the initial tranche and about USD 371 million if the full holdings were staked.