diff --git a/src/sigstore_tsp/base.py b/src/sigstore_tsp/base.py
new file mode 100644
index 0000000..de41dce
--- /dev/null
+++ b/src/sigstore_tsp/base.py
@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+
+class TimestampRequestBuilder:
+    def __init__(self, data: bytes| None = None, hash_algorithm: None = None, req_policy: None = None, nonce: int | None = None, cert_req : bool = False, extensions: None = None):
+        self._data = data
+        self._algorithm = hash_algorithm
+        self._req_policy = req_policy
+        self._nonce = nonce
+        self._cert_req = cert_req
+        self._extensions = extensions
+
+    def data(self, data: bytes) -> TimestampRequestBuilder:
+        if not data:
+            raise ValueError("The data to timestamp cannot be empty.")
+        if self._data is not None:
+            raise ValueError("The data may only be set once.")
+        return TimestampRequestBuilder(
+            data, self._algorithm, self._req_policy, self._nonce, self._cert_req, self._extensions
+        )
+
+    def add_extension(self, extension: None) -> TimestampRequestBuilder:
+        raise NotImplemented("Adding extensions is not yet supported.")
+
+    def build(self):
+        raise NotImplemented("Building is not yet supported.")
\ No newline at end of file
diff --git a/src/sigstore_tsp/bindings/__init__.py b/src/sigstore_tsp/bindings/__init__.py
new file mode 100644
index 0000000..e69de29