diff --git a/src/config.ts b/src/config.ts
index ebd5c47c..6d8979b3 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -222,11 +222,14 @@ export function getBountyEnsureBytecode(
     inputToEthPrice: BigNumber,
     outputToEthPrice: BigNumber,
     minimumExcepted: BigNumber,
+    sender: string,
 ): string {
     const inputPrice = inputToEthPrice.toHexString().substring(2).padStart(64, "0");
     const outputPrice = outputToEthPrice.toHexString().substring(2).padStart(64, "0");
     const minimum = minimumExcepted.toHexString().substring(2).padStart(64, "0");
+    const msgSender = sender.substring(2).padStart(64, "0").toLowerCase();
     // rainlang bytecode:
+    // :ensure(sender context<0 0>()),
     // :ensure(
     //   greater-than-or-equal-to(
     //     add(
@@ -237,7 +240,7 @@ export function getBountyEnsureBytecode(
     //   )
     //   \"minimum sender output\"
     // );
-    return `0x0000000000000000000000000000000000000000000000000000000000000004${inputPrice}${outputPrice}${minimum}956d696e696d756d2073656e646572206f757470757400000000000000000000000000000000000000000000000000000000000000000000000000000000003b0100000d06000203100001011000003d12000003100101011000013d120000011000030110000200100001001000002b120000211200001d020000`;
+    return `0x0000000000000000000000000000000000000000000000000000000000000006${msgSender}8e756e6b6e6f776e2073656e6465720000000000000000000000000000000000${inputPrice}${outputPrice}${minimum}956d696e696d756d2073656e646572206f7574707574000000000000000000000000000000000000000000000000000000000000000000000000000000000047010000100500000110000103100000011000001e1200001d020000011000050110000403100101011000033d12000003100001011000023d1200002b120000211200001d020000`;
 }
 
 /**
@@ -260,6 +263,7 @@ export function getWithdrawEnsureBytecode(
     inputToEthPrice: BigNumber,
     outputToEthPrice: BigNumber,
     minimumExcepted: BigNumber,
+    sender: string,
 ): string {
     const bot = botAddress.substring(2).padStart(64, "0");
     const input = inputToken.substring(2).padStart(64, "0");
@@ -269,7 +273,9 @@ export function getWithdrawEnsureBytecode(
     const inputPrice = inputToEthPrice.toHexString().substring(2).padStart(64, "0");
     const outputPrice = outputToEthPrice.toHexString().substring(2).padStart(64, "0");
     const minimum = minimumExcepted.toHexString().substring(2).padStart(64, "0");
+    const msgSender = sender.substring(2).padStart(64, "0").toLowerCase();
     // rainlang bytecode:
+    // :ensure(sender context<0 0>()),
     // :ensure(
     //   greater-than-or-equal-to(
     //     add(
@@ -280,7 +286,7 @@ export function getWithdrawEnsureBytecode(
     //   )
     //   \"minimumSenderOutput\"
     // );
-    return `0x0000000000000000000000000000000000000000000000000000000000000009${input}${bot}${inputBalance}${inputPrice}${output}${outputBalance}${outputPrice}${minimum}936d696e696d756d53656e6465724f757470757400000000000000000000000000000000000000000000000000000000000000000000000000000000000000530100001307000001100008011000070110000601100005011000010110000411120000471200003d1200000110000301100002011000010110000011120000471200003d1200002b120000211200001d020000`;
+    return `0x000000000000000000000000000000000000000000000000000000000000000b${msgSender}8e756e6b6e6f776e2073656e6465720000000000000000000000000000000000${input}${bot}${inputBalance}${inputPrice}${output}${outputBalance}${outputPrice}${minimum}936d696e696d756d53656e6465724f75747075740000000000000000000000000000000000000000000000000000000000000000000000000000000000000067010000180700000110000103100000011000001e1200001d0200000110000a011000090110000801100007011000030110000611120000471200003d1200000110000501100004011000030110000211120000471200003d1200002b120000211200001d020000`;
 }
 
 /**
diff --git a/src/modes/interOrderbook.ts b/src/modes/interOrderbook.ts
index d85bdd05..8132d278 100644
--- a/src/modes/interOrderbook.ts
+++ b/src/modes/interOrderbook.ts
@@ -94,6 +94,7 @@ export async function dryrun({
                           ethers.utils.parseUnits(inputToEthPrice),
                           ethers.utils.parseUnits(outputToEthPrice),
                           ethers.constants.Zero,
+                          signer.account.address,
                       ),
         },
         signedContext: [],
@@ -149,6 +150,7 @@ export async function dryrun({
             ethers.utils.parseUnits(inputToEthPrice),
             ethers.utils.parseUnits(outputToEthPrice),
             gasCost.mul(headroom).div("100"),
+            signer.account.address,
         );
         rawtx.data = arb.interface.encodeFunctionData("arb3", [
             orderPairObject.orderbook,
@@ -168,6 +170,7 @@ export async function dryrun({
                 ethers.utils.parseUnits(inputToEthPrice),
                 ethers.utils.parseUnits(outputToEthPrice),
                 gasCost.mul(config.gasCoveragePercentage).div("100"),
+                signer.account.address,
             );
             rawtx.data = arb.interface.encodeFunctionData("arb3", [
                 orderPairObject.orderbook,
diff --git a/src/modes/intraOrderbook.ts b/src/modes/intraOrderbook.ts
index 6314f1a8..4021b6b8 100644
--- a/src/modes/intraOrderbook.ts
+++ b/src/modes/intraOrderbook.ts
@@ -67,6 +67,7 @@ export async function dryrun({
                 ethers.utils.parseUnits(inputToEthPrice),
                 ethers.utils.parseUnits(outputToEthPrice),
                 ethers.constants.Zero,
+                signer.account.address,
             ),
         },
         signedContext: [],
@@ -152,6 +153,7 @@ export async function dryrun({
             ethers.utils.parseUnits(inputToEthPrice),
             ethers.utils.parseUnits(outputToEthPrice),
             gasCost.mul(headroom).div("100"),
+            signer.account.address,
         );
         withdrawOutputCalldata = obInterface.encodeFunctionData("withdraw2", [
             orderPairObject.sellToken,
@@ -180,6 +182,7 @@ export async function dryrun({
                 ethers.utils.parseUnits(inputToEthPrice),
                 ethers.utils.parseUnits(outputToEthPrice),
                 gasCost.mul(config.gasCoveragePercentage).div("100"),
+                signer.account.address,
             );
             withdrawOutputCalldata = obInterface.encodeFunctionData("withdraw2", [
                 orderPairObject.sellToken,
diff --git a/src/modes/routeProcessor.ts b/src/modes/routeProcessor.ts
index b961123f..69a2d858 100644
--- a/src/modes/routeProcessor.ts
+++ b/src/modes/routeProcessor.ts
@@ -169,6 +169,7 @@ export async function dryrun({
                               ethers.utils.parseUnits(ethPrice),
                               ethers.constants.Zero,
                               ethers.constants.Zero,
+                              signer.account.address,
                           ),
             },
             signedContext: [],
@@ -228,6 +229,7 @@ export async function dryrun({
                 ethers.utils.parseUnits(ethPrice),
                 ethers.constants.Zero,
                 gasCost.mul(headroom).div("100"),
+                signer.account.address,
             );
             rawtx.data = arb.interface.encodeFunctionData("arb3", [
                 orderPairObject.orderbook,
@@ -253,6 +255,7 @@ export async function dryrun({
                     ethers.utils.parseUnits(ethPrice),
                     ethers.constants.Zero,
                     gasCost.mul(config.gasCoveragePercentage).div("100"),
+                    signer.account.address,
                 );
                 rawtx.data = arb.interface.encodeFunctionData("arb3", [
                     orderPairObject.orderbook,
diff --git a/test/findOpp.test.js b/test/findOpp.test.js
index 2c899f02..d82feca7 100644
--- a/test/findOpp.test.js
+++ b/test/findOpp.test.js
@@ -88,6 +88,7 @@ describe("Test find opp", async function () {
                     ethers.utils.parseUnits(inputToEthPrice),
                     ethers.constants.Zero,
                     gasLimitEstimation.mul(gasPrice),
+                    signer.account.address,
                 ),
             },
             signedContext: [],
@@ -184,6 +185,7 @@ describe("Test find opp", async function () {
                     ethers.utils.parseUnits(inputToEthPrice),
                     ethers.utils.parseUnits(outputToEthPrice),
                     gasLimitEstimation.mul(gasPrice),
+                    signer.account.address,
                 ),
             },
             signedContext: [],
@@ -258,6 +260,7 @@ describe("Test find opp", async function () {
                     ethers.utils.parseUnits(inputToEthPrice),
                     ethers.utils.parseUnits(outputToEthPrice),
                     gasLimitEstimation.mul(gasPrice),
+                    signer.account.address,
                 ),
             },
             signedContext: [],
diff --git a/test/mode-interOrderbook.test.js b/test/mode-interOrderbook.test.js
index 17d6c5f3..24ac4a2d 100644
--- a/test/mode-interOrderbook.test.js
+++ b/test/mode-interOrderbook.test.js
@@ -85,6 +85,7 @@ describe("Test inter-orderbook dryrun", async function () {
                     ethers.utils.parseUnits(inputToEthPrice),
                     ethers.utils.parseUnits(outputToEthPrice),
                     gasLimitEstimation.mul(gasPrice),
+                    signer.account.address,
                 ),
             },
             signedContext: [],
@@ -219,6 +220,7 @@ describe("Test inter-orderbook find opp", async function () {
                     ethers.utils.parseUnits(inputToEthPrice),
                     ethers.utils.parseUnits(outputToEthPrice),
                     gasLimitEstimation.mul(gasPrice),
+                    signer.account.address,
                 ),
             },
             signedContext: [],
@@ -314,6 +316,7 @@ describe("Test inter-orderbook find opp", async function () {
                         ethers.utils.parseUnits(inputToEthPrice),
                         ethers.utils.parseUnits(outputToEthPrice),
                         ethers.constants.Zero,
+                        signer.account.address,
                     ),
                 },
                 signedContext: [],
diff --git a/test/mode-intraOrderbook.test.js b/test/mode-intraOrderbook.test.js
index e2647c24..0718e23d 100644
--- a/test/mode-intraOrderbook.test.js
+++ b/test/mode-intraOrderbook.test.js
@@ -65,6 +65,7 @@ describe("Test intra-orderbook dryrun", async function () {
                     ethers.utils.parseUnits(inputToEthPrice),
                     ethers.utils.parseUnits(outputToEthPrice),
                     gasLimitEstimation.mul(gasPrice),
+                    signer.account.address,
                 ),
             },
             signedContext: [],
@@ -195,6 +196,7 @@ describe("Test intra-orderbook find opp", async function () {
                     ethers.utils.parseUnits(inputToEthPrice),
                     ethers.utils.parseUnits(outputToEthPrice),
                     gasLimitEstimation.mul(gasPrice),
+                    signer.account.address,
                 ),
             },
             signedContext: [],
@@ -296,6 +298,7 @@ describe("Test intra-orderbook find opp", async function () {
                                 ethers.utils.parseUnits(inputToEthPrice),
                                 ethers.utils.parseUnits(outputToEthPrice),
                                 ethers.constants.Zero,
+                                signer.account.address,
                             ),
                         },
                         signedContext: [],
diff --git a/test/mode-routeProcessor.test.js b/test/mode-routeProcessor.test.js
index 8040e646..1dbdce30 100644
--- a/test/mode-routeProcessor.test.js
+++ b/test/mode-routeProcessor.test.js
@@ -86,6 +86,7 @@ describe("Test route processor dryrun", async function () {
                     ethers.utils.parseUnits(ethPrice),
                     ethers.constants.Zero,
                     gasLimitEstimation.mul(gasPrice),
+                    signer.account.address,
                 ),
             },
             signedContext: [],
@@ -203,6 +204,7 @@ describe("Test route processor dryrun", async function () {
                         ethers.utils.parseUnits(ethPrice),
                         ethers.constants.Zero,
                         ethers.constants.Zero,
+                        signer.account.address,
                     ),
                 },
                 signedContext: [],
@@ -285,6 +287,7 @@ describe("Test route processor find opp", async function () {
                     ethers.utils.parseUnits(ethPrice),
                     ethers.constants.Zero,
                     gasLimitEstimation.mul(gasPrice),
+                    signer.account.address,
                 ),
             },
             signedContext: [],
@@ -367,6 +370,7 @@ describe("Test route processor find opp", async function () {
                     ethers.utils.parseUnits(ethPrice),
                     ethers.constants.Zero,
                     gasLimitEstimation.mul(gasPrice),
+                    signer.account.address,
                 ),
             },
             signedContext: [],
@@ -450,6 +454,7 @@ describe("Test route processor find opp", async function () {
                         ethers.utils.parseUnits(ethPrice),
                         ethers.constants.Zero,
                         ethers.constants.Zero,
+                        signer.account.address,
                     ),
                 },
                 signedContext: [],
@@ -566,6 +571,7 @@ describe("Test find opp with retries", async function () {
                     ethers.utils.parseUnits(ethPrice),
                     ethers.constants.Zero,
                     gasLimitEstimation.mul(gasPrice),
+                    signer.account.address,
                 ),
             },
             signedContext: [],
@@ -646,6 +652,7 @@ describe("Test find opp with retries", async function () {
                         ethers.utils.parseUnits(ethPrice),
                         ethers.constants.Zero,
                         ethers.constants.Zero,
+                        signer.account.address,
                     ),
                 },
                 signedContext: [],