Reorganize project structure

checkaddy_app/validators/dash.py

@@ -0,0 +1,18 @@
+from __future__ import annotations
+
+from .common import base58check_verify
+
+
+def validate_dash_address(address: str) -> tuple[bool, str]:
+    address = address.strip()
+    if not (address.startswith("X") or address.startswith("7")):
+        return False, "DASH Base58 addresses must start with X or 7"
+
+    valid, reason, version, payload_len = base58check_verify(address)
+    if not valid:
+        return False, reason
+    if payload_len != 21:
+        return False, "Unexpected Base58 payload length"
+    if version not in (0x4C, 0x10):
+        return False, "Invalid DASH version byte"
+    return True, "Valid Base58Check address"