diff --git a/.gitignore b/.gitignore
index 10d6526..b17afa9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -106,6 +106,7 @@ dist
 # TernJS port file
 .tern-port
 artifacts
+deployments
 cache
 .pnp.*
 .yarn/*
diff --git a/packages/contracts/.gitignore b/packages/contracts/.gitignore
index 9f0543b..de153db 100644
--- a/packages/contracts/.gitignore
+++ b/packages/contracts/.gitignore
@@ -1,2 +1 @@
-deployments
 artifacts
diff --git a/packages/contracts/contracts/OffchainResolver.sol b/packages/contracts/contracts/OffchainResolver.sol
index 42df5b1..af33637 100644
--- a/packages/contracts/contracts/OffchainResolver.sol
+++ b/packages/contracts/contracts/OffchainResolver.sol
@@ -6,7 +6,7 @@ import "./IExtendedResolver.sol";
 import "./SignatureVerifier.sol";
 
 interface IResolverService {
-    function resolve(bytes calldata name, bytes calldata data) external view returns(bytes memory result, uint64 expires, bytes memory sig);
+    function resolve(bytes calldata name, bytes calldata data, address verifier) external view returns(bytes memory result, uint64 expires, bytes memory sig);
 }
 
 /**
@@ -39,7 +39,7 @@ contract OffchainResolver is IExtendedResolver, SupportsInterface {
      * @return The return data, ABI encoded identically to the underlying function.
      */
     function resolve(bytes calldata name, bytes calldata data) external override view returns(bytes memory) {
-        bytes memory callData = abi.encodeWithSelector(IResolverService.resolve.selector, name, data);
+        bytes memory callData = abi.encodeWithSelector(IResolverService.resolve.selector, name, data, address(this));
         string[] memory urls = new string[](1);
         urls[0] = url;
         revert OffchainLookup(
@@ -47,7 +47,7 @@ contract OffchainResolver is IExtendedResolver, SupportsInterface {
             urls,
             callData,
             OffchainResolver.resolveWithProof.selector,
-            abi.encode(callData, address(this))
+            callData
         );
     }
 
diff --git a/packages/contracts/contracts/SignatureVerifier.sol b/packages/contracts/contracts/SignatureVerifier.sol
index 8c9ed91..190338e 100644
--- a/packages/contracts/contracts/SignatureVerifier.sol
+++ b/packages/contracts/contracts/SignatureVerifier.sol
@@ -25,8 +25,7 @@ library SignatureVerifier {
      */
     function verify(bytes calldata request, bytes calldata response) internal view returns(address, bytes memory) {
         (bytes memory result, uint64 expires, bytes memory sig) = abi.decode(response, (bytes, uint64, bytes));
-        (bytes memory extraData, address sender) = abi.decode(request, (bytes, address));
-        address signer = ECDSA.recover(makeSignatureHash(sender, expires, extraData, result), sig);
+        address signer = ECDSA.recover(makeSignatureHash(address(this), expires, request, result), sig);
         require(
             expires >= block.timestamp,
             "SignatureVerifier: Signature expired");
diff --git a/packages/contracts/hardhat.config.js b/packages/contracts/hardhat.config.js
index 82fe413..7c75d77 100644
--- a/packages/contracts/hardhat.config.js
+++ b/packages/contracts/hardhat.config.js
@@ -1,28 +1,27 @@
 // const { task } = require('hardhat/config');
-require('@nomiclabs/hardhat-etherscan');
-require('@nomiclabs/hardhat-ethers');
-require('@nomiclabs/hardhat-waffle');
-require('hardhat-deploy');
-require('hardhat-deploy-ethers');
+require("@nomiclabs/hardhat-etherscan");
+require("@nomiclabs/hardhat-ethers");
+require("@nomiclabs/hardhat-waffle");
+require("hardhat-deploy");
+require("hardhat-deploy-ethers");
 
 real_accounts = undefined;
 if (process.env.DEPLOYER_KEY && process.env.OWNER_KEY) {
   real_accounts = [process.env.OWNER_KEY, process.env.DEPLOYER_KEY];
 }
 const gatewayurl =
-  'https://offchain-resolver-example.uc.r.appspot.com/{sender}/{data}.json';
+  "https://offchain-resolver-example.uc.r.appspot.com/{sender}/{data}.json";
 
-let devgatewayurl = 'http://localhost:8080/{sender}/{data}.json';
+let devgatewayurl = "http://localhost:8080/{sender}/{data}.json";
 if (process.env.REMOTE_GATEWAY) {
-  devgatewayurl =
-    `${process.env.REMOTE_GATEWAY}/{sender}/{data}.json`;
+  devgatewayurl = `${process.env.REMOTE_GATEWAY}/{sender}/{data}.json`;
 }
 /**
  * @type import('hardhat/config').HardhatUserConfig
  */
 
 module.exports = {
-  solidity: '0.8.10',
+  solidity: "0.8.10",
   networks: {
     hardhat: {
       throwOnCallFailures: false,
@@ -30,28 +29,35 @@ module.exports = {
     },
     ropsten: {
       url: `https://ropsten.infura.io/v3/${process.env.INFURA_ID}`,
-      tags: ['test', 'demo'],
+      tags: ["test", "demo"],
       chainId: 3,
       accounts: real_accounts,
       gatewayurl,
     },
     rinkeby: {
       url: `https://rinkeby.infura.io/v3/${process.env.INFURA_ID}`,
-      tags: ['test', 'demo'],
+      tags: ["test", "demo"],
       chainId: 4,
       accounts: real_accounts,
       gatewayurl,
     },
     goerli: {
       url: `https://goerli.infura.io/v3/${process.env.INFURA_ID}`,
-      tags: ['test', 'demo'],
+      tags: ["test", "demo"],
       chainId: 5,
       accounts: real_accounts,
       gatewayurl,
     },
+    sepolia: {
+      url: `https://sepolia.infura.io/v3/${process.env.INFURA_ID}`,
+      tags: ["test", "demo"],
+      chainId: 11155111,
+      accounts: real_accounts,
+      gatewayurl,
+    },
     mainnet: {
       url: `https://mainnet.infura.io/v3/${process.env.INFURA_ID}`,
-      tags: ['demo'],
+      tags: ["demo"],
       chainId: 1,
       accounts: real_accounts,
       gatewayurl,
@@ -62,7 +68,7 @@ module.exports = {
   },
   namedAccounts: {
     signer: {
-      default: '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266',
+      default: "0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266",
     },
     deployer: {
       default: 1,
diff --git a/packages/contracts/test/TestOffchainResolver.js b/packages/contracts/test/TestOffchainResolver.js
index 34f520b..2ba1d42 100644
--- a/packages/contracts/test/TestOffchainResolver.js
+++ b/packages/contracts/test/TestOffchainResolver.js
@@ -78,10 +78,9 @@ describe('OffchainResolver', function (accounts) {
         it('resolves an address given a valid signature', async () => {
             // Generate the response data
             const response = defaultAbiCoder.encode(['bytes', 'uint64', 'bytes'], [resultData, expires, hexConcat([sig.r, sig._vs])]);
-            const encodedData = ethers.utils.defaultAbiCoder.encode(['bytes', 'address'], [callData, resolver.address]);
 
             // Call the function with the request and response
-            const [result] = iface.decodeFunctionResult("addr", await resolver.resolveWithProof(response, encodedData));
+            const [result] = iface.decodeFunctionResult("addr", await resolver.resolveWithProof(response, callData));
             expect(result).to.equal(TEST_ADDRESS);
         });
 
diff --git a/packages/gateway-worker/src/server.ts b/packages/gateway-worker/src/server.ts
index a5f5dde..1462c29 100644
--- a/packages/gateway-worker/src/server.ts
+++ b/packages/gateway-worker/src/server.ts
@@ -102,7 +102,7 @@ export function makeServer(
   server.add(IResolverService_abi, [
     {
       type: 'resolve',
-      func: async ([encodedName, data]: Result, request) => {
+      func: async ([encodedName, data, verifier]: Result, request) => {
         const name = decodeDnsName(Buffer.from(encodedName.slice(2), 'hex'));
         // Query the database
         const { result, validUntil } = await query(await db, name, data);
@@ -112,7 +112,7 @@ export function makeServer(
           ['bytes', 'address', 'uint64', 'bytes32', 'bytes32'],
           [
             '0x1900',
-            request?.to,
+            verifier,
             validUntil,
             ethers.utils.keccak256(request?.data || '0x'),
             ethers.utils.keccak256(result),
diff --git a/packages/gateway-worker/test/server.test.ts b/packages/gateway-worker/test/server.test.ts
index 0299eec..4eb3caf 100644
--- a/packages/gateway-worker/test/server.test.ts
+++ b/packages/gateway-worker/test/server.test.ts
@@ -77,6 +77,7 @@ describe('makeServer', () => {
     const outerData = IResolverService.encodeFunctionData('resolve', [
       dnsName(name),
       innerData,
+      TEST_ADDRESS,
     ]);
     // Call the server with address and data
     const { status, body } = await server.call({
diff --git a/packages/gateway/src/server.ts b/packages/gateway/src/server.ts
index ebd0be3..76664f4 100644
--- a/packages/gateway/src/server.ts
+++ b/packages/gateway/src/server.ts
@@ -97,7 +97,7 @@ export function makeServer(signer: ethers.utils.SigningKey, db: Database) {
   server.add(IResolverService_abi, [
     {
       type: 'resolve',
-      func: async ([encodedName, data]: Result, request) => {
+      func: async ([encodedName, data, verifier]: Result, request) => {
         const name = decodeDnsName(Buffer.from(encodedName.slice(2), 'hex'));
         // Query the database
         const { result, validUntil } = await query(db, name, data);
@@ -107,7 +107,7 @@ export function makeServer(signer: ethers.utils.SigningKey, db: Database) {
           ['bytes', 'address', 'uint64', 'bytes32', 'bytes32'],
           [
             '0x1900',
-            request?.to,
+            verifier,
             validUntil,
             ethers.utils.keccak256(request?.data || '0x'),
             ethers.utils.keccak256(result),
diff --git a/packages/gateway/test/server.test.ts b/packages/gateway/test/server.test.ts
index 0299eec..4eb3caf 100644
--- a/packages/gateway/test/server.test.ts
+++ b/packages/gateway/test/server.test.ts
@@ -77,6 +77,7 @@ describe('makeServer', () => {
     const outerData = IResolverService.encodeFunctionData('resolve', [
       dnsName(name),
       innerData,
+      TEST_ADDRESS,
     ]);
     // Call the server with address and data
     const { status, body } = await server.call({