From 2c69abe268e65034da183fc2b46b5be47c13f542 Mon Sep 17 00:00:00 2001
From: Sean Bowe <ewillbefull@gmail.com>
Date: Fri, 9 Mar 2018 14:17:45 -0700
Subject: [PATCH] Add Uncommitted^Sapling.

---
 src/primitives/mod.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/primitives/mod.rs b/src/primitives/mod.rs
index 6ac1040..2ac43b1 100644
--- a/src/primitives/mod.rs
+++ b/src/primitives/mod.rs
@@ -1,4 +1,5 @@
 use pairing::{
+    Field,
     PrimeField,
     PrimeFieldRepr
 };
@@ -165,6 +166,15 @@ pub struct Note<E: JubjubEngine> {
 }
 
 impl<E: JubjubEngine> Note<E> {
+    pub fn uncommitted() -> E::Fr {
+        // The smallest u-coordinate that is not on the curve
+        // is one.
+        // TODO: This should be relocated to JubjubEngine as
+        // it's specific to the curve we're using, not all
+        // twisted edwards curves.
+        E::Fr::one()
+    }
+
     /// Computes the note commitment, returning the full point.
     fn cm_full_point(&self, params: &E::Params) -> edwards::Point<E, PrimeOrder>
     {