diff --git a/py/converter.py b/py/converter.py
index 701d6f9..a325fb9 100644
--- a/py/converter.py
+++ b/py/converter.py
@@ -27,6 +27,7 @@ OTHER DEALINGS IN THE SOFTWARE.
 import json
 from ecdsa import SigningKey, VerifyingKey, SECP256k1
 from ecdsa.util import PRNG
+from base64 import b16decode
 
 f = open('temp.json', 'r')
 request = json.load(f)