diff --git a/onchain/src/nip01.cairo b/onchain/src/nip01.cairo
new file mode 100644
index 00000000..98b9766a
--- /dev/null
+++ b/onchain/src/nip01.cairo
@@ -0,0 +1,12 @@
+#[derive(Copy, Drop)]
+struct NIP01Event {
+    id: u256,
+    pubkey: u256,
+    created_at: u64,
+    kind: u16,
+    tags: Array<Array<ByteArray>>,
+    content: ByteArray,
+    sig_r: u256,
+    sig_s: u256
+}
+