diff --git a/tapdb/sqlc/migrations/000020_asset_unique_key.down.sql b/tapdb/sqlc/migrations/000020_asset_unique_key.down.sql
new file mode 100644
index 000000000..d491775ed
--- /dev/null
+++ b/tapdb/sqlc/migrations/000020_asset_unique_key.down.sql
@@ -0,0 +1 @@
+DROP INDEX IF EXISTS assets_genesis_id_script_key_id_anchor_utxo_id_unique;
diff --git a/tapdb/sqlc/migrations/000020_asset_unique_key.up.sql b/tapdb/sqlc/migrations/000020_asset_unique_key.up.sql
new file mode 100644
index 000000000..c5d0f5581
--- /dev/null
+++ b/tapdb/sqlc/migrations/000020_asset_unique_key.up.sql
@@ -0,0 +1,4 @@
+CREATE UNIQUE INDEX assets_genesis_id_script_key_id_anchor_utxo_id_unique
+ON assets (
+    genesis_id, script_key_id, anchor_utxo_id
+);