diff --git a/db/migrations/00018_ethHeaderCidByBlockNumber.sql b/db/migrations/00018_ethHeaderCidByBlockNumber.sql
new file mode 100644
index 0000000..2f448e5
--- /dev/null
+++ b/db/migrations/00018_ethHeaderCidByBlockNumber.sql
@@ -0,0 +1,11 @@
+-- +goose Up
+CREATE FUNCTION "ethHeaderCidByBlockNumber"(n bigint) returns SETOF eth.header_cids
+    stable
+    language sql
+as
+$$
+SELECT * FROM eth.header_cids WHERE block_number=$1 ORDER BY id
+$$;
+
+-- +goose Down
+DROP FUNCTION "ethHeaderCidByBlockNumber"(bigint);
\ No newline at end of file