diff --git a/schemas/database/017_comittment_uniqueness_for_identities.down.sql b/schemas/database/017_comittment_uniqueness_for_identities.down.sql
new file mode 100644
index 00000000..491820e8
--- /dev/null
+++ b/schemas/database/017_comittment_uniqueness_for_identities.down.sql
@@ -0,0 +1 @@
+DROP INDEX identities_unique_commitment;
\ No newline at end of file
diff --git a/schemas/database/017_comittment_uniqueness_for_identities.up.sql b/schemas/database/017_comittment_uniqueness_for_identities.up.sql
new file mode 100644
index 00000000..19a4f95e
--- /dev/null
+++ b/schemas/database/017_comittment_uniqueness_for_identities.up.sql
@@ -0,0 +1 @@
+CREATE UNIQUE INDEX identities_unique_commitment on identities(commitment) WHERE commitment != E'\\x0000000000000000000000000000000000000000000000000000000000000000';
\ No newline at end of file