This enables users of the parameters to verify block chains back to genesis.
The genesis blocks for mainnet and the global testnet are fixed values. Regtest is a bit messier because it's fixed in zcashd, but I believe Zebra uses a different regtest genesis block because they use different PoW parameters (but also don't validate regtest PoW at all, so maybe this difference can be eliminated).
This enables users of the parameters to verify block chains back to genesis.
The genesis blocks for mainnet and the global testnet are fixed values. Regtest is a bit messier because it's fixed in
zcashd, but I believe Zebra uses a different regtest genesis block because they use different PoW parameters (but also don't validate regtest PoW at all, so maybe this difference can be eliminated).