SIMD-0215 Homomorphic Hashing of Account State

Authors: Brooks Prumo, Emanuele Cesena, Josh Siegel, Sam Kim

This proposal adds a new hash, Accounts Lattice Hash, that uses homomorphic hashing to maintain a hash of the total account state. The Accounts Lattice Hash is both fast to update, and secure, enabling (1) every block to contain the hash of all accounts, instead of only the accounts changed in that block, and (2) removing the Epoch Accounts Hash.