diff --git a/.gitignore b/.gitignore
index 918d6e29..3c895cf5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,4 +5,5 @@ node_modules
 coverage
 .env
 *.temp
-~/node_modules
\ No newline at end of file
+~/node_modules
+cache
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..0fbd3435
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,6 @@
+[submodule "forge/lib/forge-std"]
+	path = forge/lib/forge-std
+	url = https://github.com/foundry-rs/forge-std
+[submodule "forge/lib/openzeppelin-contracts"]
+	path = forge/lib/openzeppelin-contracts
+	url = https://github.com/OpenZeppelin/openzeppelin-contracts
diff --git a/.vscode/settings.json b/.vscode/settings.json
index c1ade3fc..12d111f4 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,11 +1,11 @@
 {
-    "editor.codeActionsOnSave": {
-        "source.addMissingImports": true,
-        "source.organizeImports": true,
-        "source.formatDocument": true,
-        "source.fixAll": true
-    },
-    "editor.showUnused": true,
-    "editor.formatOnPaste": true,
-    "editor.formatOnSave": true
+  "editor.codeActionsOnSave": {
+    "source.addMissingImports": true,
+    "source.fixAll": true,
+    "source.formatDocument": true,
+    "source.organizeImports": true
+  },
+  "editor.formatOnPaste": true,
+  "editor.formatOnSave": true,
+  "editor.showUnused": true
 }
diff --git a/forge/.github/workflows/test.yml b/forge/.github/workflows/test.yml
new file mode 100644
index 00000000..9282e829
--- /dev/null
+++ b/forge/.github/workflows/test.yml
@@ -0,0 +1,34 @@
+name: test
+
+on: workflow_dispatch
+
+env:
+  FOUNDRY_PROFILE: ci
+
+jobs:
+  check:
+    strategy:
+      fail-fast: true
+
+    name: Foundry project
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Install Foundry
+        uses: foundry-rs/foundry-toolchain@v1
+        with:
+          version: nightly
+
+      - name: Run Forge build
+        run: |
+          forge --version
+          forge build --sizes
+        id: build
+
+      - name: Run Forge tests
+        run: |
+          forge test -vvv
+        id: test
diff --git a/forge/.gitignore b/forge/.gitignore
new file mode 100644
index 00000000..85198aaa
--- /dev/null
+++ b/forge/.gitignore
@@ -0,0 +1,14 @@
+# Compiler files
+cache/
+out/
+
+# Ignores development broadcast logs
+!/broadcast
+/broadcast/*/31337/
+/broadcast/**/dry-run/
+
+# Docs
+docs/
+
+# Dotenv file
+.env
diff --git a/forge/README.md b/forge/README.md
new file mode 100644
index 00000000..9265b455
--- /dev/null
+++ b/forge/README.md
@@ -0,0 +1,66 @@
+## Foundry
+
+**Foundry is a blazing fast, portable and modular toolkit for Ethereum application development written in Rust.**
+
+Foundry consists of:
+
+-   **Forge**: Ethereum testing framework (like Truffle, Hardhat and DappTools).
+-   **Cast**: Swiss army knife for interacting with EVM smart contracts, sending transactions and getting chain data.
+-   **Anvil**: Local Ethereum node, akin to Ganache, Hardhat Network.
+-   **Chisel**: Fast, utilitarian, and verbose solidity REPL.
+
+## Documentation
+
+https://book.getfoundry.sh/
+
+## Usage
+
+### Build
+
+```shell
+$ forge build
+```
+
+### Test
+
+```shell
+$ forge test
+```
+
+### Format
+
+```shell
+$ forge fmt
+```
+
+### Gas Snapshots
+
+```shell
+$ forge snapshot
+```
+
+### Anvil
+
+```shell
+$ anvil
+```
+
+### Deploy
+
+```shell
+$ forge script script/Counter.s.sol:CounterScript --rpc-url <your_rpc_url> --private-key <your_private_key>
+```
+
+### Cast
+
+```shell
+$ cast <subcommand>
+```
+
+### Help
+
+```shell
+$ forge --help
+$ anvil --help
+$ cast --help
+```
diff --git a/forge/foundry.toml b/forge/foundry.toml
new file mode 100644
index 00000000..25b918f9
--- /dev/null
+++ b/forge/foundry.toml
@@ -0,0 +1,6 @@
+[profile.default]
+src = "src"
+out = "out"
+libs = ["lib"]
+
+# See more config options https://github.com/foundry-rs/foundry/blob/master/crates/config/README.md#all-options
diff --git a/forge/lib/forge-std b/forge/lib/forge-std
new file mode 160000
index 00000000..bb4ceea9
--- /dev/null
+++ b/forge/lib/forge-std
@@ -0,0 +1 @@
+Subproject commit bb4ceea94d6f10eeb5b41dc2391c6c8bf8e734ef
diff --git a/forge/lib/openzeppelin-contracts b/forge/lib/openzeppelin-contracts
new file mode 160000
index 00000000..dbb6104c
--- /dev/null
+++ b/forge/lib/openzeppelin-contracts
@@ -0,0 +1 @@
+Subproject commit dbb6104ce834628e473d2173bbc9d47f81a9eec3
diff --git a/forge/src/NegativeAmountHandler.sol b/forge/src/NegativeAmountHandler.sol
new file mode 100644
index 00000000..6a80ff51
--- /dev/null
+++ b/forge/src/NegativeAmountHandler.sol
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import "openzeppelin-contracts/contracts/utils/cryptography/EIP712.sol";
+import "openzeppelin-contracts/contracts/utils/cryptography/ECDSA.sol";
+
+contract NegativeAmountHandler is EIP712 {
+    string private constant SIGNING_DOMAIN = "NegativeAmountHandler";
+    string private constant SIGNATURE_VERSION = "1";
+
+    struct Data {
+        int256 amount;
+        string message;
+    }
+
+    constructor() EIP712(SIGNING_DOMAIN, SIGNATURE_VERSION) {}
+
+    function verify(Data calldata data, bytes calldata signature) public view returns (bool) {
+        address signer = _verify(_hash(data), signature);
+        return signer == msg.sender;  // Ensure that the signer is the sender of the message
+    }
+
+    function _hash(Data calldata data) internal view returns (bytes32) {
+        return _hashTypedDataV4(keccak256(abi.encode(
+            keccak256("Data(int256 amount,string message)"),
+            data.amount,
+            keccak256(bytes(data.message))
+        )));
+    }
+
+    function _verify(bytes32 digest, bytes memory signature) internal view returns (address) {
+        return ECDSA.recover(digest, signature);
+    }
+}
diff --git a/package-lock.json b/package-lock.json
index 89331cc7..8e48d374 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,6 +13,7 @@
         "@ethereumjs/common": "3.1.2",
         "@ethereumjs/tx": "4.1.2",
         "@ethersproject/abi": "^5.7.0",
+        "@metamask/eth-sig-util": "^7.0.2",
         "@types/uuid": "^9.0.0",
         "aes-js": "^3.1.1",
         "bech32": "^2.0.0",
@@ -23,7 +24,6 @@
         "buffer": "^6.0.3",
         "crc-32": "^1.2.0",
         "elliptic": "6.5.4",
-        "eth-eip712-util-browser": "^0.0.3",
         "hash.js": "^1.1.7",
         "js-sha3": "^0.8.0",
         "rlp": "^3.0.0",
@@ -35,6 +35,7 @@
         "@babel/preset-env": "^7.18.2",
         "@babel/preset-typescript": "^7.17.12",
         "@chainsafe/bls-keystore": "^3.0.0",
+        "@ethersproject/providers": "^5.7.2",
         "@ethersproject/transactions": "^5.5.0",
         "@noble/bls12-381": "^1.3.0",
         "@solana/web3.js": "^1.34.0",
@@ -59,6 +60,7 @@
         "eslint-config-prettier": "^8.5.0",
         "eslint-plugin-prettier": "^4.0.0",
         "ethereumjs-util": "^7.1.4",
+        "ethers": "^5.7.2",
         "jsonc": "^2.0.0",
         "lodash": ">=4.17.21",
         "minimist": ">=0.2.1",
@@ -1968,11 +1970,10 @@
       }
     },
     "node_modules/@ethereumjs/util": {
-      "version": "8.0.6",
-      "resolved": "https://registry.npmjs.org/@ethereumjs/util/-/util-8.0.6.tgz",
-      "integrity": "sha512-zFLG/gXtF3QUC7iKFn4PT6HCr+DEnlCbwUGKGtXoqjA+64T+e0FuqMjlo4bQIY2ngRzk3EtudKdGYC4g31ehhg==",
+      "version": "8.1.0",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/util/-/util-8.1.0.tgz",
+      "integrity": "sha512-zQ0IqbdX8FZ9aw11vP+dZkKDkS+kgIvQPHnSAXzP9pLu+Rfu3D3XEeLbicvoXJTYnhZiPmsZUxgdzXwNKxRPbA==",
       "dependencies": {
-        "@chainsafe/ssz": "^0.11.1",
         "@ethereumjs/rlp": "^4.0.1",
         "ethereum-cryptography": "^2.0.0",
         "micro-ftch": "^0.3.1"
@@ -2146,6 +2147,26 @@
         "@ethersproject/bytes": "^5.7.0"
       }
     },
+    "node_modules/@ethersproject/basex": {
+      "version": "5.7.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/basex/-/basex-5.7.0.tgz",
+      "integrity": "sha512-ywlh43GwZLv2Voc2gQVTKBoVQ1mti3d8HK5aMxsfu/nRDnMmNqaSJ3r3n85HBByT8OpoY96SXM1FogC533T4zw==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://gitcoin.co/grants/13/ethersjs-complete-simple-and-tiny-2"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.buymeacoffee.com/ricmoo"
+        }
+      ],
+      "dependencies": {
+        "@ethersproject/bytes": "^5.7.0",
+        "@ethersproject/properties": "^5.7.0"
+      }
+    },
     "node_modules/@ethersproject/bignumber": {
       "version": "5.7.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/bignumber/-/bignumber-5.7.0.tgz",
@@ -2202,6 +2223,34 @@
         "@ethersproject/bignumber": "^5.7.0"
       }
     },
+    "node_modules/@ethersproject/contracts": {
+      "version": "5.7.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/contracts/-/contracts-5.7.0.tgz",
+      "integrity": "sha512-5GJbzEU3X+d33CdfPhcyS+z8MzsTrBGk/sc+G+59+tPa9yFkl6HQ9D6L0QMgNTA9q8dT0XKxxkyp883XsQvbbg==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://gitcoin.co/grants/13/ethersjs-complete-simple-and-tiny-2"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.buymeacoffee.com/ricmoo"
+        }
+      ],
+      "dependencies": {
+        "@ethersproject/abi": "^5.7.0",
+        "@ethersproject/abstract-provider": "^5.7.0",
+        "@ethersproject/abstract-signer": "^5.7.0",
+        "@ethersproject/address": "^5.7.0",
+        "@ethersproject/bignumber": "^5.7.0",
+        "@ethersproject/bytes": "^5.7.0",
+        "@ethersproject/constants": "^5.7.0",
+        "@ethersproject/logger": "^5.7.0",
+        "@ethersproject/properties": "^5.7.0",
+        "@ethersproject/transactions": "^5.7.0"
+      }
+    },
     "node_modules/@ethersproject/hash": {
       "version": "5.7.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/hash/-/hash-5.7.0.tgz",
@@ -2228,6 +2277,73 @@
         "@ethersproject/strings": "^5.7.0"
       }
     },
+    "node_modules/@ethersproject/hdnode": {
+      "version": "5.7.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/hdnode/-/hdnode-5.7.0.tgz",
+      "integrity": "sha512-OmyYo9EENBPPf4ERhR7oj6uAtUAhYGqOnIS+jE5pTXvdKBS99ikzq1E7Iv0ZQZ5V36Lqx1qZLeak0Ra16qpeOg==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://gitcoin.co/grants/13/ethersjs-complete-simple-and-tiny-2"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.buymeacoffee.com/ricmoo"
+        }
+      ],
+      "dependencies": {
+        "@ethersproject/abstract-signer": "^5.7.0",
+        "@ethersproject/basex": "^5.7.0",
+        "@ethersproject/bignumber": "^5.7.0",
+        "@ethersproject/bytes": "^5.7.0",
+        "@ethersproject/logger": "^5.7.0",
+        "@ethersproject/pbkdf2": "^5.7.0",
+        "@ethersproject/properties": "^5.7.0",
+        "@ethersproject/sha2": "^5.7.0",
+        "@ethersproject/signing-key": "^5.7.0",
+        "@ethersproject/strings": "^5.7.0",
+        "@ethersproject/transactions": "^5.7.0",
+        "@ethersproject/wordlists": "^5.7.0"
+      }
+    },
+    "node_modules/@ethersproject/json-wallets": {
+      "version": "5.7.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/json-wallets/-/json-wallets-5.7.0.tgz",
+      "integrity": "sha512-8oee5Xgu6+RKgJTkvEMl2wDgSPSAQ9MB/3JYjFV9jlKvcYHUXZC+cQp0njgmxdHkYWn8s6/IqIZYm0YWCjO/0g==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://gitcoin.co/grants/13/ethersjs-complete-simple-and-tiny-2"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.buymeacoffee.com/ricmoo"
+        }
+      ],
+      "dependencies": {
+        "@ethersproject/abstract-signer": "^5.7.0",
+        "@ethersproject/address": "^5.7.0",
+        "@ethersproject/bytes": "^5.7.0",
+        "@ethersproject/hdnode": "^5.7.0",
+        "@ethersproject/keccak256": "^5.7.0",
+        "@ethersproject/logger": "^5.7.0",
+        "@ethersproject/pbkdf2": "^5.7.0",
+        "@ethersproject/properties": "^5.7.0",
+        "@ethersproject/random": "^5.7.0",
+        "@ethersproject/strings": "^5.7.0",
+        "@ethersproject/transactions": "^5.7.0",
+        "aes-js": "3.0.0",
+        "scrypt-js": "3.0.1"
+      }
+    },
+    "node_modules/@ethersproject/json-wallets/node_modules/aes-js": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/aes-js/-/aes-js-3.0.0.tgz",
+      "integrity": "sha512-H7wUZRn8WpTq9jocdxQ2c8x2sKo9ZVmzfRE13GiNJXfp7NcKYEdvl3vspKjXox6RIG2VtaRe4JFvxG4rqp2Zuw==",
+      "dev": true
+    },
     "node_modules/@ethersproject/keccak256": {
       "version": "5.7.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/keccak256/-/keccak256-5.7.0.tgz",
@@ -2280,6 +2396,26 @@
         "@ethersproject/logger": "^5.7.0"
       }
     },
+    "node_modules/@ethersproject/pbkdf2": {
+      "version": "5.7.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/pbkdf2/-/pbkdf2-5.7.0.tgz",
+      "integrity": "sha512-oR/dBRZR6GTyaofd86DehG72hY6NpAjhabkhxgr3X2FpJtJuodEl2auADWBZfhDHgVCbu3/H/Ocq2uC6dpNjjw==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://gitcoin.co/grants/13/ethersjs-complete-simple-and-tiny-2"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.buymeacoffee.com/ricmoo"
+        }
+      ],
+      "dependencies": {
+        "@ethersproject/bytes": "^5.7.0",
+        "@ethersproject/sha2": "^5.7.0"
+      }
+    },
     "node_modules/@ethersproject/properties": {
       "version": "5.7.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/properties/-/properties-5.7.0.tgz",
@@ -2298,6 +2434,91 @@
         "@ethersproject/logger": "^5.7.0"
       }
     },
+    "node_modules/@ethersproject/providers": {
+      "version": "5.7.2",
+      "resolved": "https://registry.npmjs.org/@ethersproject/providers/-/providers-5.7.2.tgz",
+      "integrity": "sha512-g34EWZ1WWAVgr4aptGlVBF8mhl3VWjv+8hoAnzStu8Ah22VHBsuGzP17eb6xDVRzw895G4W7vvx60lFFur/1Rg==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://gitcoin.co/grants/13/ethersjs-complete-simple-and-tiny-2"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.buymeacoffee.com/ricmoo"
+        }
+      ],
+      "dependencies": {
+        "@ethersproject/abstract-provider": "^5.7.0",
+        "@ethersproject/abstract-signer": "^5.7.0",
+        "@ethersproject/address": "^5.7.0",
+        "@ethersproject/base64": "^5.7.0",
+        "@ethersproject/basex": "^5.7.0",
+        "@ethersproject/bignumber": "^5.7.0",
+        "@ethersproject/bytes": "^5.7.0",
+        "@ethersproject/constants": "^5.7.0",
+        "@ethersproject/hash": "^5.7.0",
+        "@ethersproject/logger": "^5.7.0",
+        "@ethersproject/networks": "^5.7.0",
+        "@ethersproject/properties": "^5.7.0",
+        "@ethersproject/random": "^5.7.0",
+        "@ethersproject/rlp": "^5.7.0",
+        "@ethersproject/sha2": "^5.7.0",
+        "@ethersproject/strings": "^5.7.0",
+        "@ethersproject/transactions": "^5.7.0",
+        "@ethersproject/web": "^5.7.0",
+        "bech32": "1.1.4",
+        "ws": "7.4.6"
+      }
+    },
+    "node_modules/@ethersproject/providers/node_modules/bech32": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/bech32/-/bech32-1.1.4.tgz",
+      "integrity": "sha512-s0IrSOzLlbvX7yp4WBfPITzpAU8sqQcpsmwXDiKwrG4r491vwCO/XpejasRNl0piBMe/DvP4Tz0mIS/X1DPJBQ==",
+      "dev": true
+    },
+    "node_modules/@ethersproject/providers/node_modules/ws": {
+      "version": "7.4.6",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.4.6.tgz",
+      "integrity": "sha512-YmhHDO4MzaDLB+M9ym/mDA5z0naX8j7SIlT8f8z+I0VtzsRbekxEutHSme7NPS2qE8StCYQNUnfWdXta/Yu85A==",
+      "dev": true,
+      "engines": {
+        "node": ">=8.3.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": "^5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@ethersproject/random": {
+      "version": "5.7.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/random/-/random-5.7.0.tgz",
+      "integrity": "sha512-19WjScqRA8IIeWclFme75VMXSBvi4e6InrUNuaR4s5pTF2qNhcGdCUwdxUVGtDDqC00sDLCO93jPQoDUH4HVmQ==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://gitcoin.co/grants/13/ethersjs-complete-simple-and-tiny-2"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.buymeacoffee.com/ricmoo"
+        }
+      ],
+      "dependencies": {
+        "@ethersproject/bytes": "^5.7.0",
+        "@ethersproject/logger": "^5.7.0"
+      }
+    },
     "node_modules/@ethersproject/rlp": {
       "version": "5.7.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/rlp/-/rlp-5.7.0.tgz",
@@ -2361,6 +2582,30 @@
         "hash.js": "1.1.7"
       }
     },
+    "node_modules/@ethersproject/solidity": {
+      "version": "5.7.0",
+      "resolved": "https://registry.npmjs.org/@ethersproject/solidity/-/solidity-5.7.0.tgz",
+      "integrity": "sha512-HmabMd2Dt/raavyaGukF4XxizWKhKQ24DoLtdNbBmNKUOPqwjsKQSdV9GQtj9CBEea9DlzETlVER1gYeXXBGaA==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://gitcoin.co/grants/13/ethersjs-complete-simple-and-tiny-2"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.buymeacoffee.com/ricmoo"
+        }
+      ],
+      "dependencies": {
+        "@ethersproject/bignumber": "^5.7.0",
+        "@ethersproject/bytes": "^5.7.0",
+        "@ethersproject/keccak256": "^5.7.0",
+        "@ethersproject/logger": "^5.7.0",
+        "@ethersproject/sha2": "^5.7.0",
+        "@ethersproject/strings": "^5.7.0"
+      }
+    },
     "node_modules/@ethersproject/strings": {
       "version": "5.7.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/strings/-/strings-5.7.0.tgz",
@@ -2407,6 +2652,60 @@
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       "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
-      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
-      "dev": true
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="
     },
     "yargs": {
       "version": "16.2.0",
diff --git a/package.json b/package.json
index 2e6f999c..c5087fc3 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,8 @@
     "e2e-sign-solana": "vitest src/__test__/e2e/signing/solana*",
     "e2e-sign-unformatted": "vitest src/__test__/e2e/signing/unformatted.test.ts",
     "e2e-wj": "vitest src/__test__/e2e/wallet-jobs.test.ts",
-    "e2e-api": "vitest src/__test__/e2e/api.test.ts"
+    "e2e-api": "vitest src/__test__/e2e/api.test.ts",
+    "contracts": "vitest src/__test__/e2e/contracts.test.ts"
   },
   "files": [
     "dist"
@@ -46,6 +47,7 @@
     "@ethereumjs/common": "3.1.2",
     "@ethereumjs/tx": "4.1.2",
     "@ethersproject/abi": "^5.7.0",
+    "@metamask/eth-sig-util": "^7.0.2",
     "@types/uuid": "^9.0.0",
     "aes-js": "^3.1.1",
     "bech32": "^2.0.0",
@@ -56,7 +58,6 @@
     "buffer": "^6.0.3",
     "crc-32": "^1.2.0",
     "elliptic": "6.5.4",
-    "eth-eip712-util-browser": "^0.0.3",
     "hash.js": "^1.1.7",
     "js-sha3": "^0.8.0",
     "rlp": "^3.0.0",
@@ -68,6 +69,7 @@
     "@babel/preset-env": "^7.18.2",
     "@babel/preset-typescript": "^7.17.12",
     "@chainsafe/bls-keystore": "^3.0.0",
+    "@ethersproject/providers": "^5.7.2",
     "@ethersproject/transactions": "^5.5.0",
     "@noble/bls12-381": "^1.3.0",
     "@solana/web3.js": "^1.34.0",
@@ -92,6 +94,7 @@
     "eslint-config-prettier": "^8.5.0",
     "eslint-plugin-prettier": "^4.0.0",
     "ethereumjs-util": "^7.1.4",
+    "ethers": "^5.7.2",
     "jsonc": "^2.0.0",
     "lodash": ">=4.17.21",
     "minimist": ">=0.2.1",
diff --git a/src/__test__/e2e/contracts.test.ts b/src/__test__/e2e/contracts.test.ts
new file mode 100644
index 00000000..07b78a73
--- /dev/null
+++ b/src/__test__/e2e/contracts.test.ts
@@ -0,0 +1,110 @@
+import * as dotenv from 'dotenv';
+import { BigNumber, Contract, Wallet, providers } from 'ethers';
+import { joinSignature } from 'ethers/lib/utils';
+import { question } from 'readline-sync';
+import { pair, signMessage } from '../..';
+import NegativeAmountHandler from '../../../forge/out/NegativeAmountHandler.sol/NegativeAmountHandler.json';
+import { deployContract } from '../utils/contracts';
+import { setupClient } from '../utils/setup';
+
+dotenv.config();
+
+const ETH_PROVIDER_URL = 'http://localhost:8545';
+const WALLET_PRIVATE_KEY =
+  '0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80';
+
+describe('NegativeAmountHandler', () => {
+  let contract: Contract;
+  let wallet: Wallet;
+  let CONTRACT_ADDRESS: string;
+  let chainId: number;
+  let domain;
+  let data;
+  let types;
+
+  beforeAll(async () => {
+    CONTRACT_ADDRESS = await deployContract('NegativeAmountHandler');
+
+    const provider = new providers.JsonRpcProvider(ETH_PROVIDER_URL);
+    chainId = (await provider.getNetwork()).chainId;
+    wallet = new Wallet(WALLET_PRIVATE_KEY, provider);
+
+    contract = new Contract(
+      CONTRACT_ADDRESS,
+      NegativeAmountHandler.abi,
+      wallet,
+    );
+
+    domain = {
+      name: 'NegativeAmountHandler',
+      version: '1',
+      chainId,
+      verifyingContract: CONTRACT_ADDRESS,
+    };
+
+    types = {
+      Data: [
+        { name: 'amount', type: 'int256' },
+        { name: 'message', type: 'string' },
+      ],
+    };
+
+    data = {
+      amount: -100,
+      message: 'Negative payment test',
+    };
+  });
+
+  test('pair', async () => {
+    const isPaired = await setupClient();
+    if (!isPaired) {
+      const secret = question('Please enter the pairing secret: ');
+      await pair(secret.toUpperCase());
+    }
+  });
+
+  test('Sign Negative Amount EIP712 Contract', async () => {
+    /**
+     * Sign the contract with Ethers
+     */
+    const ethersSignature = await wallet._signTypedData(domain, types, data);
+    const ethersTx = await contract.verify(data, ethersSignature, {
+      gasLimit: 100000,
+    });
+    expect(ethersTx).toBeTruthy();
+
+    /**
+     * Sign the contract with Lattice
+     */
+    const _types = {
+      ...types,
+      EIP712Domain: [
+        { name: 'name', type: 'string' },
+        { name: 'version', type: 'string' },
+        { name: 'chainId', type: 'uint256' },
+        { name: 'verifyingContract', type: 'address' },
+      ],
+    };
+
+    const msg = {
+      types: _types,
+      domain,
+      primaryType: 'Data',
+      message: data,
+    };
+
+    const response = await signMessage(msg);
+    const r = `0x${response.sig.r.toString('hex')}`;
+    const s = `0x${response.sig.s.toString('hex')}`;
+    const v = BigNumber.from(response.sig.v).toNumber();
+    const latticeSignature = joinSignature({ r, s, v });
+
+    expect(latticeSignature).toEqual(ethersSignature);
+
+    const tx = await contract.verify(data, latticeSignature, {
+      gasLimit: 100000,
+    });
+
+    expect(tx).toBeTruthy();
+  });
+});
diff --git a/src/__test__/utils/contracts.ts b/src/__test__/utils/contracts.ts
new file mode 100644
index 00000000..96566315
--- /dev/null
+++ b/src/__test__/utils/contracts.ts
@@ -0,0 +1,23 @@
+import { exec } from 'child_process';
+import * as dotenv from 'dotenv';
+import { promisify } from 'util';
+dotenv.config();
+const ETH_PROVIDER_URL = 'http://localhost:8545';
+const WALLET_PRIVATE_KEY =
+  '0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80';
+const execAsync = promisify(exec);
+
+export async function deployContract(contractName: string): Promise<string> {
+  const forgeLocation = `${__dirname}/../../../forge/src`;
+  console.log('Building the contract...');
+  await execAsync(`cd ${forgeLocation} && forge build`);
+
+  console.log('Deploying the contract...');
+  const createResult = await execAsync(
+    `cd ${forgeLocation} && forge create src/${contractName}.sol:${contractName} --rpc-url ${ETH_PROVIDER_URL} --private-key ${WALLET_PRIVATE_KEY} --json`,
+  );
+
+  const output = JSON.parse(createResult.stdout);
+  console.log('Contract deployed at address:', output.deployedTo);
+  return output.deployedTo;
+}
diff --git a/src/ethereum.ts b/src/ethereum.ts
index d4ca053f..af36e8db 100644
--- a/src/ethereum.ts
+++ b/src/ethereum.ts
@@ -4,8 +4,7 @@ import { Chain, Common, Hardfork } from '@ethereumjs/common';
 import { TransactionFactory } from '@ethereumjs/tx';
 import BN from 'bignumber.js';
 import cbor from 'borc';
-//@ts-expect-error - This third-party package is not typed properly
-import { TypedDataUtils } from 'eth-eip712-util-browser';
+import { SignTypedDataVersion, TypedDataUtils } from '@metamask/eth-sig-util';
 import { keccak256 } from 'js-sha3';
 import { encode as rlpEncode } from 'rlp';
 import secp256k1 from 'secp256k1';
@@ -69,10 +68,14 @@ const validateEthereumMsgResponse = function (res, req) {
       useEIP155: false,
     });
   } else if (input.protocol === 'eip712') {
-    const encoded = TypedDataUtils.hash(req.input.payload);
+    const encoded = TypedDataUtils.eip712Hash(
+      req.input.payload,
+      SignTypedDataVersion.V3,
+    );
     const digest = prehash ? prehash : encoded;
+    const chainId = parseInt(input.payload.domain.chainId, 16);
     // Get recovery param with a `v` value of [27,28] by setting `useEIP155=false`
-    return addRecoveryParam(digest, sig, signer, { useEIP155: false });
+    return addRecoveryParam(digest, sig, signer, { chainId });
   } else {
     throw new Error('Unsupported protocol');
   }
@@ -704,7 +707,10 @@ function buildEIP712Request(req, input) {
     // If this payload is too large to send, but the Lattice allows a prehashed message, do that
     req.payload.writeUInt16LE(payload.length, off);
     off += 2;
-    const prehash = TypedDataUtils.hash(req.input.payload);
+    const prehash = TypedDataUtils.eip712Hash(
+      req.input.payload,
+      SignTypedDataVersion.V3,
+    );
     const prehashBuf = Buffer.from(prehash);
     prehashBuf.copy(req.payload, off);
     req.prehash = prehash;
diff --git a/tsconfig.json b/tsconfig.json
index 551b8786..999e31a8 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -64,6 +64,12 @@
     "typeRoots": ["node_modules/@types", "src/**/types"],
     "types": ["node", "jest", "vitest", "vitest/globals"]
   },
-  "exclude": ["node_modules", "**/__test__", "**/*.spec.ts", "**/*.test.ts"],
-  "include": ["./src"]
+  "exclude": [
+    "node_modules",
+    "**/__test__",
+    "**/*.spec.ts",
+    "**/*.test.ts",
+    "forge"
+  ],
+  "include": ["./src", "forge"]
 }