diff --git a/substrate/consensus/src/weights.rs b/substrate/consensus/src/weights.rs
new file mode 100644
index 00000000..d9d5c405
--- /dev/null
+++ b/substrate/consensus/src/weights.rs
@@ -0,0 +1,21 @@
+// TODO
+
+use tendermint_machine::ext::{BlockNumber, Round, Weights};
+
+const VALIDATORS: usize = 1;
+
+pub(crate) struct TendermintWeights;
+impl Weights for TendermintWeights {
+  type ValidatorId = u16;
+
+  fn total_weight(&self) -> u64 {
+    VALIDATORS.try_into().unwrap()
+  }
+  fn weight(&self, id: u16) -> u64 {
+    [1; VALIDATORS][usize::try_from(id).unwrap()]
+  }
+
+  fn proposer(&self, number: BlockNumber, round: Round) -> u16 {
+    u16::try_from((number.0 + u64::from(round.0)) % u64::try_from(VALIDATORS).unwrap()).unwrap()
+  }
+}