diff --git a/signoff/ycr_core_top/OPENLANE_VERSION b/signoff/ycr_core_top/OPENLANE_VERSION
new file mode 100644
index 0000000..078e9d2
--- /dev/null
+++ b/signoff/ycr_core_top/OPENLANE_VERSION
@@ -0,0 +1 @@
+openlane 0dc6fb79c91082b94f8ded78d70f8bacbab96bf2
diff --git a/signoff/ycr_core_top/PDK_SOURCES b/signoff/ycr_core_top/PDK_SOURCES
new file mode 100644
index 0000000..b08beb4
--- /dev/null
+++ b/signoff/ycr_core_top/PDK_SOURCES
@@ -0,0 +1 @@
+open_pdks 41c0908b47130d5675ff8484255b43f66463a7d6