Practical Byzantine Fault Tolerance can be a consensus algorithm launched during the late 90s by Barbara Liskov and Miguel Castro. pBFT was designed to work competently in asynchronous(no higher sure on when the response towards the ask for will be obtained) units. It can be optimized for small overhead https://financefeeds.com/altcoin-season-alert-bitcoin-solaris-presale-closing-soon-20-launch-price-confirmed/