diff --git a/src/families/cosmos/js-buildTransaction.ts b/src/families/cosmos/js-buildTransaction.ts
index fae6e18eb2..c9e3b5e85b 100644
--- a/src/families/cosmos/js-buildTransaction.ts
+++ b/src/families/cosmos/js-buildTransaction.ts
@@ -96,7 +96,7 @@ const buildTransaction = async (
           value: {
             validatorSrcAddress: transaction.cosmosSourceValidator,
             delegatorAddress: account.freshAddress,
-            validatorAddress: transaction.validators[0].address,
+            validatorDstAddress: transaction.validators[0].address,
             amount: {
               denom: account.currency.units[1].code,
               amount: transaction.validators[0].amount.toString(),
diff --git a/src/families/cosmos/js-prepareTransaction.ts b/src/families/cosmos/js-prepareTransaction.ts
index 100c1be426..0bc88f1eb7 100644
--- a/src/families/cosmos/js-prepareTransaction.ts
+++ b/src/families/cosmos/js-prepareTransaction.ts
@@ -42,7 +42,10 @@ const prepareTransaction = async (
     patch.memo = "Ledger Live";
   }
 
-  const unsignedPayload = await buildTransaction(account, transaction);
+  const unsignedPayload = await buildTransaction(account, {
+    ...transaction,
+    ...patch,
+  });
 
   // be sure payload is complete
   if (unsignedPayload) {
diff --git a/src/families/cosmos/js-signOperation.ts b/src/families/cosmos/js-signOperation.ts
index 678b57c7ff..c045ac5b2d 100644
--- a/src/families/cosmos/js-signOperation.ts
+++ b/src/families/cosmos/js-signOperation.ts
@@ -1,4 +1,4 @@
-import { Account, SignOperationEvent } from "../../types";
+import { Account, OperationType, SignOperationEvent } from "../../types";
 import type { Transaction } from "./types";
 import { getAccount, getChainId } from "./api/Cosmos";
 import { Observable } from "rxjs";
@@ -145,24 +145,31 @@ const signOperation = ({
 
         o.next({ type: "device-signature-granted" });
 
-        // build optimistic operation
         const txHash = ""; // resolved at broadcast time
-        const senders = [account.freshAddress];
-        const recipients = [transaction.recipient];
-        const accountId = account.id;
+        const type: OperationType =
+          transaction.mode === "undelegate"
+            ? "UNDELEGATE"
+            : transaction.mode === "delegate"
+            ? "DELEGATE"
+            : transaction.mode === "redelegate"
+            ? "REDELEGATE"
+            : ["claimReward", "claimRewardCompound"].includes(transaction.mode)
+            ? "REWARD"
+            : "OUT";
 
+        // build optimistic operation
         const operation = {
-          id: encodeOperationId(accountId, txHash, "OUT"),
+          id: encodeOperationId(account.id, txHash, type),
           hash: txHash,
-          type: "OUT",
+          type: type,
           value: transaction.amount,
           fee: transaction.fees,
           extra: {},
           blockHash: null,
           blockHeight: null,
-          senders,
-          recipients,
-          accountId,
+          senders: [account.freshAddress],
+          recipients: [transaction.recipient],
+          account: account.id,
           date: new Date(),
         };