diff --git a/core/base.py b/core/base.py
new file mode 100644
index 0000000..d0bab2e
--- /dev/null
+++ b/core/base.py
@@ -0,0 +1,42 @@
+from pydantic import BaseModel
+from typing import List
+from sqlite3 import Row
+
+
+class BasePoint(BaseModel):
+    """Named BasePoint because it conflicts with ecc.curve.Point"""
+
+    x: int
+    y: int
+
+
+class Proof(BaseModel):
+    amount: int
+    C: BasePoint
+    secret: str
+
+    @classmethod
+    def from_row(cls, row: Row):
+        return dict(
+            amount=row[0],
+            C=dict(
+                x=int(row[1]),
+                y=int(row[2]),
+            ),
+            secret=row[3],
+        )
+
+
+class MintPayload(BaseModel):
+    amount: int
+    B_: BasePoint
+
+
+class MintPayloads(BaseModel):
+    payloads: List[MintPayload] = []
+
+
+class SplitPayload(BaseModel):
+    proofs: List[Proof]
+    amount: int
+    output_data: MintPayloads