def get_block_signature_by_root(self, block_root: Root) -> BLSSignature:
"""
``block_root`` is the hash tree root of a beacon block.
This method provides a way to reconstruct the ``SignedBeaconBlock`` if required.
"""
key = SchemaV1.block_root_to_signature(block_root)
try:
return BLSSignature(self.db[key])
except KeyError:
raise BlockNotFound()
def persist_block(self, signed_block: BaseSignedBeaconBlock) -> None:
block = signed_block.message
block_root = block.hash_tree_root
block_root_to_block = SchemaV1.block_root_to_block(block_root)
self.db[block_root_to_block] = ssz.encode(block)
signature = signed_block.signature
block_root_to_signature = SchemaV1.block_root_to_signature(block_root)
self.db[block_root_to_signature] = signature