Blockchain//Consensus

- The rules for who creates the next block and how the network agrees it's valid.

The rules for who creates the next block and how the network agrees it's valid.

PoW (deprecated): compete by mining hash puzzles — enormous energy waste.

PoA (Clique): authorized signers take turns — fast, efficient, permissioned.

PoS (PoS): stake ETH, get randomly selected — energy efficient, open participation.