Methods and systems to control mining pools configured to mine more than one blockchain network. A pool controller may automatically select a candidate block generated for one of the blockchain networks for mining by the mining units. The selection may be based on determining an expectation value associated with each current candidate block generated for the respective blockchain networks and which of them is the highest. The expectation value may be based, at least in part, on a current coinbase value and a current difficulty setting for that blockchain network. The pool control may perform the selection with the generation of each new candidate block for any of the blockchain networks.