diff --git a/pesachat-core/pesachat_core/exceptions.py b/pesachat-core/pesachat_core/exceptions.py
new file mode 100644
index 0000000..fb57542
--- /dev/null
+++ b/pesachat-core/pesachat_core/exceptions.py
@@ -0,0 +1,10 @@
+class PesaChatError(Exception):
+    """Base exception for all PesaChat errors."""
+
+
+class AnchorError(PesaChatError):
+    """Raised when an anchor operation fails."""
+
+
+class AuthError(PesaChatError):
+    """Raised when authentication or authorisation fails."""
\ No newline at end of file