needed this as well

Author: Yakuhito

bindings/reward_distributor.json

@@ -413,6 +413,14 @@
           "locked_nft": "Nft"
         },
         "return": "RewardDistributorUnstakeResult"
+      },
+      "locked_nft_hint": {
+        "type": "static",
+        "args": {
+          "distributor_launcher_id": "Bytes32",
+          "custody_puzzle_hash": "Bytes32"
+        },
+        "return": "Bytes32"
       }
     }
   }

crates/chia-sdk-bindings/src/action_layer/reward_distributor.rs

@@ -14,8 +14,10 @@ use chia_sdk_driver::{
     RewardDistributorWithdrawIncentivesAction, RoundRewardInfo, RoundTimeInfo, SpendContext,
 };
 use chia_sdk_types::{
-    puzzles::{IntermediaryCoinProof, NftLauncherProof, RewardDistributorSlotNonce},
-    Conditions,
+    puzzles::{
+        IntermediaryCoinProof, NftLauncherProof, NonceWrapperArgs, RewardDistributorSlotNonce,
+    },
+    Conditions, Mod,
 };
 use clvm_utils::{ToTreeHash, TreeHash};
 
@@ -574,4 +576,17 @@ impl RewardDistributor {
             payment_amount,
         })
     }
+
+    pub fn locked_nft_hint(
+        distributor_launcher_id: Bytes32,
+        custody_puzzle_hash: Bytes32,
+    ) -> Result<Bytes32> {
+        Ok(NonceWrapperArgs::<Bytes32, TreeHash> {
+            nonce: custody_puzzle_hash,
+            inner_puzzle: RewardDistributorStakeAction::my_p2_puzzle_hash(distributor_launcher_id)
+                .into(),
+        }
+        .curry_tree_hash()
+        .into())
+    }
 }