Hi OP, love the concept! I have a clarification question. Will the minimum required gas for a successful call to Mine() increase as the number of calls to Mine() increase? If not, then will the minimum required gas be determined by the instantaneous largest gas limit set by the current competing Txs? Also, if two wallets invoke Mine() with the same gas limit at the same time, is it possible for both invocations to return true or will only one of them return true? Thank you for advising.