code: def from_genesis_header(cls,
                              base_db: BaseDB,
                              genesis_header: BlockHeader) -> 'BaseHeaderChain':
          
          headerdb = cls.get_headerdb_class()(cast(BaseAtomicDB, base_db))
          headerdb.persist_header(genesis_header)
          return cls(base_db, genesis_header)
docs: Initializes the chain from the genesis header.