Nope, Ethereum fast sync has to trust that peers don't give it an invalid state (it checks that all it's peers have the same state, but that is much weaker prot

Nope, Ethereum fast sync has to trust that peers don't give it an invalid state (it checks that all it's peers have the same state, but that is much weaker protection). https://github.com/ethereum/go-ethereum/pull/1889 https://github.com/ethereum/go-ethereum/pull/1889