Practical Byzantine Fault Tolerance is a consensus algorithm introduced within the late 90s by Barbara Liskov and Miguel Castro. pBFT was designed to work effectively in asynchronous(no upper bound on when the reaction for the request will be been given) units. It is actually optimized for very low overhead https://financefeeds.com/best-copyright-presales-before-listings-magacoin-finance-is-still-early-with-major-upside-ahead/