February 6, 2020 Blockstack releases updated consensus mechanism including BTC rewards for miners.

In version 2 of the Stacks blockchain, miners are required to post a BTC bond in order to mine a block. This Proof of Transfer mechanism has two classes of user: miners and stackers. Miners produce blocks and earn STX tokens in exchange for their bonded BTC at a rate of 500 STX per block. The submitted BTC will then be distributed amongst stackers as another reward. This approach differs from Proof of Stake in that submitted BTC cannot be lost through a slashing mechanism. CEO Muneeb Ali estimates that $10k worth of STX will be required to participate as a staker.