var ecip1099FBlockClassic uint64 = 11700000 // classic mainnet
var ecip1099FBlockMordor uint64 = 2520000 // mordor testnet

var hasher = etchash.New(&ecip1099FBlockMordor, nil)

if hasher.Verify(block) {
    ...
}

var hasher = etchash.New(nil, nil)

if hasher.Verify(block) {
    ...
}

var uip1FEpoch uint64 = 22 // ubiq mainnet

var hasher = etchash.New(nil, &uip1FEpoch)

if hasher.Verify(block) {
    ...
}