diff --git a/datatrails-common-api/assets/v2/assets/enums.proto b/datatrails-common-api/assets/v2/assets/enums.proto
index d440135..fe6fe5b 100644
--- a/datatrails-common-api/assets/v2/assets/enums.proto
+++ b/datatrails-common-api/assets/v2/assets/enums.proto
@@ -22,7 +22,7 @@ enum TrackedStatus {
 enum ProofMechanism {
     PROOF_MECHANISM_UNSPECIFIED = 0;
     RESERVED1 = 1;
-    RESERVED2 = 2;
+    SIMPLE_HASH = 2;
     MERKLE_LOG = 3;
 }