TreeWalker.

src/bsv/object.py

@@ -20,7 +20,10 @@ from dataclasses import dataclass
 
 @dataclass(frozen=True, order=True, slots=True)
 class Digest:
-    digest: bytes
+    digest: bytes = b""
+
+    def __bool__(self) -> bool:
+        return bool(self.digest)
 
     def __repr__(self) -> str:
         return self.digest.hex()