private static MutableWorldState createGenesisForestWorldState() {
    final ForestWorldStateKeyValueStorage stateStorage =
        new ForestWorldStateKeyValueStorage(new InMemoryKeyValueStorage());
    final WorldStatePreimageKeyValueStorage preimageStorage =
        new WorldStatePreimageKeyValueStorage(new InMemoryKeyValueStorage());
    return new ForestMutableWorldState(stateStorage, preimageStorage, EvmConfiguration.DEFAULT);
  }
Creates a Genesis world state using the Forest data storage format.

@return a mutable world state for the Genesis block
ethereum/core/src/main/java/org/hyperledger/besu/ethereum/trie/common/GenesisWorldStateProvider.java