diff --git a/types/types.proto b/types/types.proto
index b20441a..1c55c43 100644
--- a/types/types.proto
+++ b/types/types.proto
@@ -91,9 +91,7 @@ message DepositRequest {
 }
 
 message WithdrawalRequest {
-  H160 source_address = 1;
-  bytes validator_pubkey = 2;
-  uint64 amount = 3;
+  bytes request_data = 1;
 }
 
 message ConsolidationRequest {