How can a group of mutually distrustful nodes agree on the same ledger? Many people can’t answer!
The “Byzantine Generals Problem” was introduced in a 1982 paper by Lamport, Shostak, and Pease. It examines how to reach consensus in the presence of traitors.
BFT consensus requires multiple rounds of voting and communication between nodes. The more validators there are, the greater the communication overhead, so the number of validators directly participating in consensus is usually capped.
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