def update(self, key, value):
assert len(key) == 20
self.root = _update(self.db, self.root, encode_bin(key), value)
def get(self, key):
assert len(key) == 20
return _get(self.db, self.root, encode_bin(key))
def get_branch(self, key):
o = _get_branch(self.db, self.root, encode_bin(key))
assert _verify_branch(o, self.root, encode_bin(key), self.get(key))
return o
def get_prefix_witness(self, key):
return _get_prefix_witness(self.db, self.root, encode_bin(key))