diff --git a/.gitignore b/.gitignore
index 4d89ac8..12b96aa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@ __debug_*
 .DS_Store
 *secret*
 *.pem
+*Key.txt
diff --git a/adapters/node/.gitignore b/adapters/node/.gitignore
new file mode 100644
index 0000000..b512c09
--- /dev/null
+++ b/adapters/node/.gitignore
@@ -0,0 +1 @@
+node_modules
\ No newline at end of file
diff --git a/adapters/node/generate-keys.js b/adapters/node/generate-keys.js
index cc19118..e9993b7 100644
--- a/adapters/node/generate-keys.js
+++ b/adapters/node/generate-keys.js
@@ -1,28 +1,28 @@
 const crypto = require('crypto');
-const path = require('path');
 const fs = require('fs');
+const path = require('path');
+
+// Generate a random private key
+let privKey;
+do {
+  privKey = crypto.randomBytes(32);
+} while (crypto.createECDH('secp256k1').setPrivateKey(privKey, 'hex').getPublicKey() === null);
+
+// Get the ECDH object and set the private key
+const ecdh = crypto.createECDH('secp256k1');
+ecdh.setPrivateKey(privKey);
 
-// Generate a secp256k1 key pair
-const keyPair = crypto.generateKeyPairSync('ec', {
-  namedCurve: 'secp256k1'  // Name of the curve
-});
+// Get the public key in uncompressed format
+const pubKey = ecdh.getPublicKey('hex', 'uncompressed');
 
-// Export the private key as a PEM-formatted string
-const privateKey = keyPair.privateKey.export({
-  type: 'sec1',
-  format: 'pem',
-});
+const privateKeyPath = path.join(__dirname, 'privateKey.txt');
+const publicKeyPath = path.join(__dirname, 'publicKey.txt');
 
-// Export the public key as a PEM-formatted string
-const publicKey = keyPair.publicKey.export({
-  type: 'spki',
-  format: 'pem',
-});
+// Write private key to disk
+fs.writeFileSync(privateKeyPath, privKey.toString('hex'));
 
-// Specify the paths where the keys will be saved
-const privateKeyPath = path.resolve(__dirname, 'privateKey.pem')
-const publicKeyPath = path.resolve(__dirname, 'publicKey.pem')
+// Write public key to disk
+fs.writeFileSync(publicKeyPath, pubKey);
 
-// Write the keys to disk
-fs.writeFileSync(privateKeyPath, privateKey);
-fs.writeFileSync(publicKeyPath, publicKey);
\ No newline at end of file
+console.log(`Private key saved to ${privateKeyPath}`);
+console.log(`Public key saved to ${publicKeyPath}`);
\ No newline at end of file
diff --git a/adapters/node/package-lock.json b/adapters/node/package-lock.json
new file mode 100644
index 0000000..0d1a6d5
--- /dev/null
+++ b/adapters/node/package-lock.json
@@ -0,0 +1,338 @@
+{
+  "name": "signing",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "signing",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "@metamask/eth-sig-util": "^7.0.0"
+      }
+    },
+    "node_modules/@ethereumjs/common": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/common/-/common-3.2.0.tgz",
+      "integrity": "sha512-pksvzI0VyLgmuEF2FA/JR/4/y6hcPq8OUail3/AvycBaW1d5VSauOZzqGvJ3RTmR4MU35lWE8KseKOsEhrFRBA==",
+      "dependencies": {
+        "@ethereumjs/util": "^8.1.0",
+        "crc-32": "^1.2.0"
+      }
+    },
+    "node_modules/@ethereumjs/rlp": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/rlp/-/rlp-4.0.1.tgz",
+      "integrity": "sha512-tqsQiBQDQdmPWE1xkkBq4rlSW5QZpLOUJ5RJh2/9fug+q9tnUhuZoVLk7s0scUIKTOzEtR72DFBXI4WiZcMpvw==",
+      "bin": {
+        "rlp": "bin/rlp"
+      },
+      "engines": {
+        "node": ">=14"
+      }
+    },
+    "node_modules/@ethereumjs/tx": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/tx/-/tx-4.2.0.tgz",
+      "integrity": "sha512-1nc6VO4jtFd172BbSnTnDQVr9IYBFl1y4xPzZdtkrkKIncBCkdbgfdRV+MiTkJYAtTxvV12GRZLqBFT1PNK6Yw==",
+      "dependencies": {
+        "@ethereumjs/common": "^3.2.0",
+        "@ethereumjs/rlp": "^4.0.1",
+        "@ethereumjs/util": "^8.1.0",
+        "ethereum-cryptography": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=14"
+      }
+    },
+    "node_modules/@ethereumjs/util": {
+      "version": "8.1.0",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/util/-/util-8.1.0.tgz",
+      "integrity": "sha512-zQ0IqbdX8FZ9aw11vP+dZkKDkS+kgIvQPHnSAXzP9pLu+Rfu3D3XEeLbicvoXJTYnhZiPmsZUxgdzXwNKxRPbA==",
+      "dependencies": {
+        "@ethereumjs/rlp": "^4.0.1",
+        "ethereum-cryptography": "^2.0.0",
+        "micro-ftch": "^0.3.1"
+      },
+      "engines": {
+        "node": ">=14"
+      }
+    },
+    "node_modules/@metamask/abi-utils": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/@metamask/abi-utils/-/abi-utils-2.0.2.tgz",
+      "integrity": "sha512-B/A1dY/w4F/t6cDHUscklO6ovb/ztFsrsTXFd8QlqSByk/vyy+QbPE3VVpmmyI/7RX+PA1AJcvBdzCIz+r9dVQ==",
+      "dependencies": {
+        "@metamask/utils": "^8.0.0",
+        "superstruct": "^1.0.3"
+      },
+      "engines": {
+        "node": ">=16.0.0"
+      }
+    },
+    "node_modules/@metamask/eth-sig-util": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@metamask/eth-sig-util/-/eth-sig-util-7.0.0.tgz",
+      "integrity": "sha512-8KeXZB4SKx3EfNS5ahbjUMegyGvDQYk6Nk3hmM658sXpfAQR5ZlIXBgj+9RF+ZROqsU6EuNVgKt7Fr10re60PQ==",
+      "dependencies": {
+        "@ethereumjs/util": "^8.1.0",
+        "@metamask/abi-utils": "^2.0.2",
+        "@metamask/utils": "^8.1.0",
+        "ethereum-cryptography": "^2.1.2",
+        "ethjs-util": "^0.1.6",
+        "tweetnacl": "^1.0.3",
+        "tweetnacl-util": "^0.15.1"
+      },
+      "engines": {
+        "node": "^16.20 || ^18.16 || >=20"
+      }
+    },
+    "node_modules/@metamask/utils": {
+      "version": "8.2.1",
+      "resolved": "https://registry.npmjs.org/@metamask/utils/-/utils-8.2.1.tgz",
+      "integrity": "sha512-dlnpow8r0YHDDL1xKCEwUoTGOAo9icdv+gaJG0EbgDnkD/BDqW2eH1XMtm9i7rPaiHWo/aLtcrh9WBhkCq/viw==",
+      "dependencies": {
+        "@ethereumjs/tx": "^4.2.0",
+        "@noble/hashes": "^1.3.1",
+        "@scure/base": "^1.1.3",
+        "@types/debug": "^4.1.7",
+        "debug": "^4.3.4",
+        "pony-cause": "^2.1.10",
+        "semver": "^7.5.4",
+        "superstruct": "^1.0.3"
+      },
+      "engines": {
+        "node": ">=16.0.0"
+      }
+    },
+    "node_modules/@noble/curves": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@noble/curves/-/curves-1.1.0.tgz",
+      "integrity": "sha512-091oBExgENk/kGj3AZmtBDMpxQPDtxQABR2B9lb1JbVTs6ytdzZNwvhxQ4MWasRNEzlbEH8jCWFCwhF/Obj5AA==",
+      "dependencies": {
+        "@noble/hashes": "1.3.1"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@noble/curves/node_modules/@noble/hashes": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/@noble/hashes/-/hashes-1.3.1.tgz",
+      "integrity": "sha512-EbqwksQwz9xDRGfDST86whPBgM65E0OH/pCgqW0GBVzO22bNE+NuIbeTb714+IfSjU3aRk47EUvXIb5bTsenKA==",
+      "engines": {
+        "node": ">= 16"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@noble/hashes": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/@noble/hashes/-/hashes-1.3.2.tgz",
+      "integrity": "sha512-MVC8EAQp7MvEcm30KWENFjgR+Mkmf+D189XJTkFIlwohU5hcBbn1ZkKq7KVTi2Hme3PMGF390DaL52beVrIihQ==",
+      "engines": {
+        "node": ">= 16"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@scure/base": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/@scure/base/-/base-1.1.3.tgz",
+      "integrity": "sha512-/+SgoRjLq7Xlf0CWuLHq2LUZeL/w65kfzAPG5NH9pcmBhs+nunQTn4gvdwgMTIXnt9b2C/1SeL2XiysZEyIC9Q==",
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@scure/bip32": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/@scure/bip32/-/bip32-1.3.1.tgz",
+      "integrity": "sha512-osvveYtyzdEVbt3OfwwXFr4P2iVBL5u1Q3q4ONBfDY/UpOuXmOlbgwc1xECEboY8wIays8Yt6onaWMUdUbfl0A==",
+      "dependencies": {
+        "@noble/curves": "~1.1.0",
+        "@noble/hashes": "~1.3.1",
+        "@scure/base": "~1.1.0"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@scure/bip39": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/@scure/bip39/-/bip39-1.2.1.tgz",
+      "integrity": "sha512-Z3/Fsz1yr904dduJD0NpiyRHhRYHdcnyh73FZWiV+/qhWi83wNJ3NWolYqCEN+ZWsUz2TWwajJggcRE9r1zUYg==",
+      "dependencies": {
+        "@noble/hashes": "~1.3.0",
+        "@scure/base": "~1.1.0"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/@types/debug": {
+      "version": "4.1.12",
+      "resolved": "https://registry.npmjs.org/@types/debug/-/debug-4.1.12.tgz",
+      "integrity": "sha512-vIChWdVG3LG1SMxEvI/AK+FWJthlrqlTu7fbrlywTkkaONwk/UAGaULXRlf8vkzFBLVm0zkMdCquhL5aOjhXPQ==",
+      "dependencies": {
+        "@types/ms": "*"
+      }
+    },
+    "node_modules/@types/ms": {
+      "version": "0.7.34",
+      "resolved": "https://registry.npmjs.org/@types/ms/-/ms-0.7.34.tgz",
+      "integrity": "sha512-nG96G3Wp6acyAgJqGasjODb+acrI7KltPiRxzHPXnP3NgI28bpQDRv53olbqGXbfcgF5aiiHmO3xpwEpS5Ld9g=="
+    },
+    "node_modules/crc-32": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/crc-32/-/crc-32-1.2.2.tgz",
+      "integrity": "sha512-ROmzCKrTnOwybPcJApAA6WBWij23HVfGVNKqqrZpuyZOHqK2CwHSvpGuyt/UNNvaIjEd8X5IFGp4Mh+Ie1IHJQ==",
+      "bin": {
+        "crc32": "bin/crc32.njs"
+      },
+      "engines": {
+        "node": ">=0.8"
+      }
+    },
+    "node_modules/debug": {
+      "version": "4.3.4",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
+      "integrity": "sha512-PRWFHuSU3eDtQJPvnNY7Jcket1j0t5OuOsFzPPzsekD52Zl8qUfFIPEiswXqIvHWGVHOgX+7G/vCNNhehwxfkQ==",
+      "dependencies": {
+        "ms": "2.1.2"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/ethereum-cryptography": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/ethereum-cryptography/-/ethereum-cryptography-2.1.2.tgz",
+      "integrity": "sha512-Z5Ba0T0ImZ8fqXrJbpHcbpAvIswRte2wGNR/KePnu8GbbvgJ47lMxT/ZZPG6i9Jaht4azPDop4HaM00J0J59ug==",
+      "dependencies": {
+        "@noble/curves": "1.1.0",
+        "@noble/hashes": "1.3.1",
+        "@scure/bip32": "1.3.1",
+        "@scure/bip39": "1.2.1"
+      }
+    },
+    "node_modules/ethereum-cryptography/node_modules/@noble/hashes": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/@noble/hashes/-/hashes-1.3.1.tgz",
+      "integrity": "sha512-EbqwksQwz9xDRGfDST86whPBgM65E0OH/pCgqW0GBVzO22bNE+NuIbeTb714+IfSjU3aRk47EUvXIb5bTsenKA==",
+      "engines": {
+        "node": ">= 16"
+      },
+      "funding": {
+        "url": "https://paulmillr.com/funding/"
+      }
+    },
+    "node_modules/ethjs-util": {
+      "version": "0.1.6",
+      "resolved": "https://registry.npmjs.org/ethjs-util/-/ethjs-util-0.1.6.tgz",
+      "integrity": "sha512-CUnVOQq7gSpDHZVVrQW8ExxUETWrnrvXYvYz55wOU8Uj4VCgw56XC2B/fVqQN+f7gmrnRHSLVnFAwsCuNwji8w==",
+      "dependencies": {
+        "is-hex-prefixed": "1.0.0",
+        "strip-hex-prefix": "1.0.0"
+      },
+      "engines": {
+        "node": ">=6.5.0",
+        "npm": ">=3"
+      }
+    },
+    "node_modules/is-hex-prefixed": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/is-hex-prefixed/-/is-hex-prefixed-1.0.0.tgz",
+      "integrity": "sha512-WvtOiug1VFrE9v1Cydwm+FnXd3+w9GaeVUss5W4v/SLy3UW00vP+6iNF2SdnfiBoLy4bTqVdkftNGTUeOFVsbA==",
+      "engines": {
+        "node": ">=6.5.0",
+        "npm": ">=3"
+      }
+    },
+    "node_modules/lru-cache": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-6.0.0.tgz",
+      "integrity": "sha512-Jo6dJ04CmSjuznwJSS3pUeWmd/H0ffTlkXXgwZi+eq1UCmqQwCh+eLsYOYCwY991i2Fah4h1BEMCx4qThGbsiA==",
+      "dependencies": {
+        "yallist": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/micro-ftch": {
+      "version": "0.3.1",
+      "resolved": "https://registry.npmjs.org/micro-ftch/-/micro-ftch-0.3.1.tgz",
+      "integrity": "sha512-/0LLxhzP0tfiR5hcQebtudP56gUurs2CLkGarnCiB/OqEyUFQ6U3paQi/tgLv0hBJYt2rnr9MNpxz4fiiugstg=="
+    },
+    "node_modules/ms": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+      "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
+    },
+    "node_modules/pony-cause": {
+      "version": "2.1.10",
+      "resolved": "https://registry.npmjs.org/pony-cause/-/pony-cause-2.1.10.tgz",
+      "integrity": "sha512-3IKLNXclQgkU++2fSi93sQ6BznFuxSLB11HdvZQ6JW/spahf/P1pAHBQEahr20rs0htZW0UDkM1HmA+nZkXKsw==",
+      "engines": {
+        "node": ">=12.0.0"
+      }
+    },
+    "node_modules/semver": {
+      "version": "7.5.4",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.5.4.tgz",
+      "integrity": "sha512-1bCSESV6Pv+i21Hvpxp3Dx+pSD8lIPt8uVjRrxAUt/nbswYc+tK6Y2btiULjd4+fnq15PX+nqQDC7Oft7WkwcA==",
+      "dependencies": {
+        "lru-cache": "^6.0.0"
+      },
+      "bin": {
+        "semver": "bin/semver.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/strip-hex-prefix": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/strip-hex-prefix/-/strip-hex-prefix-1.0.0.tgz",
+      "integrity": "sha512-q8d4ue7JGEiVcypji1bALTos+0pWtyGlivAWyPuTkHzuTCJqrK9sWxYQZUq6Nq3cuyv3bm734IhHvHtGGURU6A==",
+      "dependencies": {
+        "is-hex-prefixed": "1.0.0"
+      },
+      "engines": {
+        "node": ">=6.5.0",
+        "npm": ">=3"
+      }
+    },
+    "node_modules/superstruct": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/superstruct/-/superstruct-1.0.3.tgz",
+      "integrity": "sha512-8iTn3oSS8nRGn+C2pgXSKPI3jmpm6FExNazNpjvqS6ZUJQCej3PUXEKM8NjHBOs54ExM+LPW/FBRhymrdcCiSg==",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
+    "node_modules/tweetnacl": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-1.0.3.tgz",
+      "integrity": "sha512-6rt+RN7aOi1nGMyC4Xa5DdYiukl2UWCbcJft7YhxReBGQD7OAM8Pbxw6YMo4r2diNEA8FEmu32YOn9rhaiE5yw=="
+    },
+    "node_modules/tweetnacl-util": {
+      "version": "0.15.1",
+      "resolved": "https://registry.npmjs.org/tweetnacl-util/-/tweetnacl-util-0.15.1.tgz",
+      "integrity": "sha512-RKJBIj8lySrShN4w6i/BonWp2Z/uxwC3h4y7xsRrpP59ZboCd0GpEVsOnMDYLMmKBpYhb5TgHzZXy7wTfYFBRw=="
+    },
+    "node_modules/yallist": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="
+    }
+  }
+}
diff --git a/adapters/node/package.json b/adapters/node/package.json
new file mode 100644
index 0000000..1c65ca8
--- /dev/null
+++ b/adapters/node/package.json
@@ -0,0 +1,15 @@
+{
+  "name": "signing",
+  "version": "1.0.0",
+  "description": "",
+  "main": "generate-keys.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@metamask/eth-sig-util": "^7.0.0"
+  }
+}
diff --git a/adapters/node/sign.js b/adapters/node/sign.js
index d16dbf4..3b91d83 100644
--- a/adapters/node/sign.js
+++ b/adapters/node/sign.js
@@ -1,32 +1,62 @@
-const path = require('path');
-const crypto = require('crypto');
 const fs = require('fs');
+const path = require('path');
+const {
+  signTypedData
+} = require("@metamask/eth-sig-util");
 
-// Load the private key from disk
-const privateKeyPath = path.resolve(__dirname, 'privateKey.pem')
-const privateKey = fs.readFileSync(privateKeyPath, 'utf8');
-
-const requestPayload = {
-  symbol: "BTCUSD",
-  orderType: "limit",
-  side: "buy",
-  quantity: "1.0",
-  price: "50000.00",
-  timestamp: "1697813554"
-};
+// Define the path to the private key file
+const privateKeyPath = path.join(__dirname, 'privateKey.txt');
 
-const jsonString = JSON.stringify(requestPayload);
+// Read the private key from the file
+const privateKeyHex = fs.readFileSync(privateKeyPath, 'utf8');
 
-// Create a hash of the JSON string
-const hash = crypto.createHash('sha256').update(jsonString).digest();
 
-// Create a signing object
-const sign = crypto.createSign('SHA256');
+const order = {
+  price: "20.99",
+  size: "1000",
+  symbol: "BTC-ETH",
+  side: "sell",
+  clientOrderId: "a677273e-12de-4acc-a4f8-de7fb5b86e37"
+};
 
-// Update the signing object with the hash
-sign.update(hash);
+const domain = {
+  name: 'orderbook',
+  version: '1.0',
+  chainId: 1, // Mainnet ID, change accordingly if you're using a different network
+  verifyingContract: '0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC' // Replace with your contract address
+};
+
+const types = {
+  Order: [
+    { name: 'price', type: 'string' },
+    { name: 'size', type: 'string' },
+    { name: 'symbol', type: 'string' },
+    { name: 'side', type: 'string' },
+    { name: 'clientOrderId', type: 'string' }
+  ]
+};
+
+const data = {
+  types: {
+    EIP712Domain: [
+      { name: 'name', type: 'string' },
+      { name: 'version', type: 'string' },
+      { name: 'chainId', type: 'uint256' },
+      { name: 'verifyingContract', type: 'address' }
+    ],
+    ...types
+  },
+  primaryType: 'Order',
+  domain: domain,
+  message: order
+};
 
-// Generate the signature using the private key
-const signature = sign.sign(privateKey, 'hex');
+// Sign the EIP-712 structured data
+const signature = signTypedData({
+  // Remove the 0x prefix if present
+  privateKey: Buffer.from(privateKeyHex.startsWith('0x') ? privateKeyHex.slice(2) : privateKeyHex, "hex"),
+  data: data,
+  version: "V4",
+});
 
-console.log('signature :', signature);
\ No newline at end of file
+console.log('EIP-712 Signature:', signature);
\ No newline at end of file
diff --git a/adapters/node/verify-signature.js b/adapters/node/verify-signature.js
deleted file mode 100644
index e297ed6..0000000
--- a/adapters/node/verify-signature.js
+++ /dev/null
@@ -1,35 +0,0 @@
-const path = require('path');
-const crypto = require('crypto');
-const fs = require('fs');
-
-const requestPayload = {
-  symbol: "BTCUSD",
-  orderType: "limit",
-  side: "buy",
-  quantity: "1.0",
-  price: "50000.00",
-  timestamp: "1697813554"
-};
-
-const signature = "30440220306c22dc5ab8c650d7bb59934f140d33d089e2ff05bb5de889ccf531a5591dff0220673cd5d2bc2ce5c815917cc680cd2076a8b560d4ab4305531a84791ea937ade7"
-
-// Load the public key from disk
-const publicKeyPath = path.resolve(__dirname, 'publicKey.pem');
-const publicKey = fs.readFileSync(publicKeyPath, 'utf8');
-console.log('publicKey :', publicKey);
-
-const jsonString = JSON.stringify(requestPayload);
-
-// Create a hash of the JSON string
-const hash = crypto.createHash('sha256').update(jsonString).digest();
-
-// Create a verify object
-const verify = crypto.createVerify('SHA256');
-
-// Update the verify object with the hash
-verify.update(hash);
-
-// Verify the signature
-const isSignatureValid = verify.verify(publicKey, signature, 'hex');
-
-console.log('Is signature valid?', isSignatureValid);
\ No newline at end of file
diff --git a/cmd/order-book/main.go b/cmd/order-book/main.go
index 6717381..95563df 100644
--- a/cmd/order-book/main.go
+++ b/cmd/order-book/main.go
@@ -42,7 +42,10 @@ func setup() {
 		log.Fatalf("error creating repository: %v", err)
 	}
 
-	service, err := service.New(repository)
+	// TODO: add CLI flag to easily switch between blockchains
+	ethClient := &service.EthereumClient{}
+
+	service, err := service.New(repository, ethClient)
 	if err != nil {
 		log.Fatalf("error creating service: %v", err)
 	}
diff --git a/go.mod b/go.mod
index 96b96ba..4badd5d 100644
--- a/go.mod
+++ b/go.mod
@@ -3,6 +3,7 @@ module github.com/orbs-network/order-book
 go 1.21.1
 
 require (
+	github.com/ethereum/go-ethereum v1.13.5
 	github.com/go-redis/redismock/v9 v9.2.0
 	github.com/google/uuid v1.3.1
 	github.com/gorilla/mux v1.8.0
@@ -14,14 +15,29 @@ require (
 )
 
 require (
+	github.com/bits-and-blooms/bitset v1.7.0 // indirect
+	github.com/btcsuite/btcd/btcec/v2 v2.2.0 // indirect
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/consensys/bavard v0.1.13 // indirect
+	github.com/consensys/gnark-crypto v0.12.1 // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
+	github.com/crate-crypto/go-kzg-4844 v0.7.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1 // indirect
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	github.com/ethereum/c-kzg-4844 v0.4.0 // indirect
+	github.com/go-stack/stack v1.8.1 // indirect
+	github.com/holiman/uint256 v1.2.3 // indirect
+	github.com/mmcloughlin/addchain v0.4.0 // indirect
 	github.com/onsi/gomega v1.28.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	github.com/supranational/blst v0.3.11 // indirect
 	github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 // indirect
 	go.uber.org/multierr v1.10.0 // indirect
+	golang.org/x/crypto v0.14.0 // indirect
+	golang.org/x/sync v0.3.0 // indirect
+	golang.org/x/sys v0.13.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
+	rsc.io/tmplfunc v0.0.3 // indirect
 )
diff --git a/go.sum b/go.sum
index 0a48d1e..2888777 100644
--- a/go.sum
+++ b/go.sum
@@ -1,41 +1,139 @@
+github.com/DataDog/zstd v1.4.5 h1:EndNeuB0l9syBZhut0wns3gV1hL8zX8LIu6ZiVHWLIQ=
+github.com/DataDog/zstd v1.4.5/go.mod h1:1jcaCB/ufaK+sKp1NBhlGmpz41jOoPQ35bpF36t7BBo=
+github.com/StackExchange/wmi v1.2.1 h1:VIkavFPXSjcnS+O8yTq7NI32k0R5Aj+v39y29VYDOSA=
+github.com/StackExchange/wmi v1.2.1/go.mod h1:rcmrprowKIVzvc+NUiLncP2uuArMWLCbu9SBzvHz7e8=
+github.com/VictoriaMetrics/fastcache v1.12.1 h1:i0mICQuojGDL3KblA7wUNlY5lOK6a4bwt3uRKnkZU40=
+github.com/VictoriaMetrics/fastcache v1.12.1/go.mod h1:tX04vaqcNoQeGLD+ra5pU5sWkuxnzWhEzLwhP9w653o=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/bits-and-blooms/bitset v1.7.0 h1:YjAGVd3XmtK9ktAbX8Zg2g2PwLIMjGREZJHlV4j7NEo=
+github.com/bits-and-blooms/bitset v1.7.0/go.mod h1:gIdJ4wp64HaoK2YrL1Q5/N7Y16edYb8uY+O0FJTyyDA=
 github.com/bsm/ginkgo/v2 v2.12.0 h1:Ny8MWAHyOepLGlLKYmXG4IEkioBysk6GpaRTLC8zwWs=
 github.com/bsm/ginkgo/v2 v2.12.0/go.mod h1:SwYbGRRDovPVboqFv0tPTcG1sN61LM1Z4ARdbAV9g4c=
 github.com/bsm/gomega v1.27.10 h1:yeMWxP2pV2fG3FgAODIY8EiRE3dy0aeFYt4l7wh6yKA=
 github.com/bsm/gomega v1.27.10/go.mod h1:JyEr/xRbxbtgWNi8tIEVPUYZ5Dzef52k01W3YH0H+O0=
+github.com/btcsuite/btcd/btcec/v2 v2.2.0 h1:fzn1qaOt32TuLjFlkzYSsBC35Q3KUjT1SwPxiMSCF5k=
+github.com/btcsuite/btcd/btcec/v2 v2.2.0/go.mod h1:U7MHm051Al6XmscBQ0BoNydpOTsFAn707034b5nY8zU=
+github.com/btcsuite/btcd/chaincfg/chainhash v1.0.1 h1:q0rUy8C/TYNBQS1+CGKw68tLOFYSNEs0TFnxxnS9+4U=
+github.com/btcsuite/btcd/chaincfg/chainhash v1.0.1/go.mod h1:7SFka0XMvUgj3hfZtydOrQY2mwhPclbT2snogU7SQQc=
 github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
 github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/cockroachdb/errors v1.8.1 h1:A5+txlVZfOqFBDa4mGz2bUWSp0aHElvHX2bKkdbQu+Y=
+github.com/cockroachdb/errors v1.8.1/go.mod h1:qGwQn6JmZ+oMjuLwjWzUNqblqk0xl4CVV3SQbGwK7Ac=
+github.com/cockroachdb/logtags v0.0.0-20190617123548-eb05cc24525f h1:o/kfcElHqOiXqcou5a3rIlMc7oJbMQkeLk0VQJ7zgqY=
+github.com/cockroachdb/logtags v0.0.0-20190617123548-eb05cc24525f/go.mod h1:i/u985jwjWRlyHXQbwatDASoW0RMlZ/3i9yJHE2xLkI=
+github.com/cockroachdb/pebble v0.0.0-20230928194634-aa077af62593 h1:aPEJyR4rPBvDmeyi+l/FS/VtA00IWvjeFvjen1m1l1A=
+github.com/cockroachdb/pebble v0.0.0-20230928194634-aa077af62593/go.mod h1:6hk1eMY/u5t+Cf18q5lFMUA1Rc+Sm5I6Ra1QuPyxXCo=
+github.com/cockroachdb/redact v1.0.8 h1:8QG/764wK+vmEYoOlfobpe12EQcS81ukx/a4hdVMxNw=
+github.com/cockroachdb/redact v1.0.8/go.mod h1:BVNblN9mBWFyMyqK1k3AAiSxhvhfK2oOZZ2lK+dpvRg=
+github.com/cockroachdb/sentry-go v0.6.1-cockroachdb.2 h1:IKgmqgMQlVJIZj19CdocBeSfSaiCbEBZGKODaixqtHM=
+github.com/cockroachdb/sentry-go v0.6.1-cockroachdb.2/go.mod h1:8BT+cPK6xvFOcRlk0R8eg+OTkcqI6baNH4xAkpiYVvQ=
+github.com/cockroachdb/tokenbucket v0.0.0-20230807174530-cc333fc44b06 h1:zuQyyAKVxetITBuuhv3BI9cMrmStnpT18zmgmTxunpo=
+github.com/cockroachdb/tokenbucket v0.0.0-20230807174530-cc333fc44b06/go.mod h1:7nc4anLGjupUW/PeY5qiNYsdNXj7zopG+eqsS7To5IQ=
+github.com/consensys/bavard v0.1.13 h1:oLhMLOFGTLdlda/kma4VOJazblc7IM5y5QPd2A/YjhQ=
+github.com/consensys/bavard v0.1.13/go.mod h1:9ItSMtA/dXMAiL7BG6bqW2m3NdSEObYWoH223nGHukI=
+github.com/consensys/gnark-crypto v0.12.1 h1:lHH39WuuFgVHONRl3J0LRBtuYdQTumFSDtJF7HpyG8M=
+github.com/consensys/gnark-crypto v0.12.1/go.mod h1:v2Gy7L/4ZRosZ7Ivs+9SfUDr0f5UlG+EM5t7MPHiLuY=
 github.com/cpuguy83/go-md2man/v2 v2.0.2 h1:p1EgwI/C7NhT0JmVkwCD2ZBK8j4aeHQX2pMHHBfMQ6w=
 github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/crate-crypto/go-kzg-4844 v0.7.0 h1:C0vgZRk4q4EZ/JgPfzuSoxdCq3C3mOZMBShovmncxvA=
+github.com/crate-crypto/go-kzg-4844 v0.7.0/go.mod h1:1kMhvPgI0Ky3yIa+9lFySEBUBXkYxeOi8ZF1sYioxhc=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/decred/dcrd/crypto/blake256 v1.0.0 h1:/8DMNYp9SGi5f0w7uCm6d6M4OU2rGFK09Y2A4Xv7EE0=
+github.com/decred/dcrd/crypto/blake256 v1.0.0/go.mod h1:sQl2p6Y26YV+ZOcSTP6thNdn47hh8kt6rqSlvmrXFAc=
+github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1 h1:YLtO71vCjJRCBcrPMtQ9nqBsqpA1m5sE92cU+pd5Mcc=
+github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1/go.mod h1:hyedUtir6IdtD/7lIxGeCxkaw7y45JueMRL4DIyJDKs=
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
-github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
-github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
+github.com/ethereum/c-kzg-4844 v0.4.0 h1:3MS1s4JtA868KpJxroZoepdV0ZKBp3u/O5HcZ7R3nlY=
+github.com/ethereum/c-kzg-4844 v0.4.0/go.mod h1:VewdlzQmpT5QSrVhbBuGoCdFJkpaJlO1aQputP83wc0=
+github.com/ethereum/go-ethereum v1.13.5 h1:U6TCRciCqZRe4FPXmy1sMGxTfuk8P7u2UoinF3VbaFk=
+github.com/ethereum/go-ethereum v1.13.5/go.mod h1:yMTu38GSuyxaYzQMViqNmQ1s3cE84abZexQmTgenWk0=
+github.com/fsnotify/fsnotify v1.6.0 h1:n+5WquG0fcWoWp6xPWfHdbskMCQaFnG6PfBrh1Ky4HY=
+github.com/fsnotify/fsnotify v1.6.0/go.mod h1:sl3t1tCWJFWoRz9R8WJCbQihKKwmorjAbSClcnxKAGw=
+github.com/go-ole/go-ole v1.2.5 h1:t4MGB5xEDZvXI+0rMjjsfBsD7yAgp/s9ZDkL1JndXwY=
+github.com/go-ole/go-ole v1.2.5/go.mod h1:pprOEPIfldk/42T2oK7lQ4v4JSDwmV0As9GaiUsvbm0=
 github.com/go-redis/redismock/v9 v9.2.0 h1:ZrMYQeKPECZPjOj5u9eyOjg8Nnb0BS9lkVIZ6IpsKLw=
 github.com/go-redis/redismock/v9 v9.2.0/go.mod h1:18KHfGDK4Y6c2R0H38EUGWAdc7ZQS9gfYxc94k7rWT0=
+github.com/go-stack/stack v1.8.1 h1:ntEHSVwIt7PNXNpgPmVfMrNhLtgjlmnZha2kOpuRiDw=
+github.com/go-stack/stack v1.8.1/go.mod h1:dcoOX6HbPZSZptuspn9bctJ+N/CnF5gGygcUP3XYfe4=
+github.com/gofrs/flock v0.8.1 h1:+gYjHKf32LDeiEEFhQaotPbLuUXjY5ZqxKgXy7n59aw=
+github.com/gofrs/flock v0.8.1/go.mod h1:F1TvTiK9OcQqauNUHlbJvyl9Qa1QvF/gOUDKA14jxHU=
+github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
+github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
+github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
+github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
+github.com/golang/snappy v0.0.5-0.20220116011046-fa5810519dcb h1:PBC98N2aIaM3XXiurYmW7fx4GZkL8feAMVq7nEjURHk=
+github.com/golang/snappy v0.0.5-0.20220116011046-fa5810519dcb/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
 github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/subcommands v1.2.0/go.mod h1:ZjhPrFU+Olkh9WazFPsl27BQ4UPiG37m3yTrtFlrHVk=
 github.com/google/uuid v1.3.1 h1:KjJaJ9iWZ3jOFZIf1Lqf4laDRCasjl0BCmnEGxkdLb4=
 github.com/google/uuid v1.3.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
 github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
+github.com/holiman/uint256 v1.2.3 h1:K8UWO1HUJpRMXBxbmaY1Y8IAMZC/RsKB+ArEnnK4l5o=
+github.com/holiman/uint256 v1.2.3/go.mod h1:SC8Ryt4n+UBbPbIBKaG9zbbDlp4jOru9xFZmPzLUTxw=
+github.com/klauspost/compress v1.15.15 h1:EF27CXIuDsYJ6mmvtBRlEuB2UVOqHG1tAXgZ7yIO+lw=
+github.com/klauspost/compress v1.15.15/go.mod h1:ZcK2JAFqKOpnBlxcLsJzYfrS9X1akm9fHZNnD9+Vo/4=
+github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
+github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
+github.com/leanovate/gopter v0.2.9 h1:fQjYxZaynp97ozCzfOyOuAGOU4aU/z37zf/tOujFk7c=
+github.com/leanovate/gopter v0.2.9/go.mod h1:U2L/78B+KVFIx2VmW6onHJQzXtFb+p5y3y2Sh+Jxxv8=
+github.com/mattn/go-runewidth v0.0.13 h1:lTGmDsbAYt5DmK6OnoV7EuIF1wEIFAcxld6ypU4OSgU=
+github.com/mattn/go-runewidth v0.0.13/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
+github.com/matttproud/golang_protobuf_extensions v1.0.2-0.20181231171920-c182affec369 h1:I0XW9+e1XWDxdcEniV4rQAIOPUGDq67JSCiRCgGCZLI=
+github.com/matttproud/golang_protobuf_extensions v1.0.2-0.20181231171920-c182affec369/go.mod h1:BSXmuO+STAnVfrANrmjBb36TMTDstsz7MSK+HVaYKv4=
+github.com/mmcloughlin/addchain v0.4.0 h1:SobOdjm2xLj1KkXN5/n0xTIWyZA2+s99UCY1iPfkHRY=
+github.com/mmcloughlin/addchain v0.4.0/go.mod h1:A86O+tHqZLMNO4w6ZZ4FlVQEadcoqkyU72HC5wJ4RlU=
+github.com/mmcloughlin/profile v0.1.1/go.mod h1:IhHD7q1ooxgwTgjxQYkACGA77oFTDdFVejUS1/tS/qU=
 github.com/nxadm/tail v1.4.8 h1:nPr65rt6Y5JFSKQO7qToXr7pePgD6Gwiw05lkbyAQTE=
 github.com/nxadm/tail v1.4.8/go.mod h1:+ncqLTQzXmGhMZNUePPaPqPvBxHAIsmXswZKocGu+AU=
+github.com/olekukonko/tablewriter v0.0.5 h1:P2Ga83D34wi1o9J6Wh1mRuqd4mF/x/lgBS7N7AbDhec=
+github.com/olekukonko/tablewriter v0.0.5/go.mod h1:hPp6KlRPjbx+hW8ykQs1w3UBbZlj6HuIJcUGPhkA7kY=
 github.com/onsi/ginkgo v1.16.5 h1:8xi0RTUf59SOSfEtZMvwTvXYMzG4gV23XVHOZiXNtnE=
 github.com/onsi/ginkgo v1.16.5/go.mod h1:+E8gABHa3K6zRBolWtd+ROzc/U5bkGt0FwiG042wbpU=
 github.com/onsi/gomega v1.28.0 h1:i2rg/p9n/UqIDAMFUJ6qIUUMcsqOuUHgbpbu235Vr1c=
 github.com/onsi/gomega v1.28.0/go.mod h1:A1H2JE76sI14WIP57LMKj7FVfCHx3g3BcZVjJG8bjX8=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/prometheus/client_golang v1.12.0 h1:C+UIj/QWtmqY13Arb8kwMt5j34/0Z2iKamrJ+ryC0Gg=
+github.com/prometheus/client_golang v1.12.0/go.mod h1:3Z9XVyYiZYEO+YQWt3RD2R3jrbd179Rt297l4aS6nDY=
+github.com/prometheus/client_model v0.2.1-0.20210607210712-147c58e9608a h1:CmF68hwI0XsOQ5UwlBopMi2Ow4Pbg32akc4KIVCOm+Y=
+github.com/prometheus/client_model v0.2.1-0.20210607210712-147c58e9608a/go.mod h1:LDGWKZIo7rky3hgvBe+caln+Dr3dPggB5dvjtD7w9+w=
+github.com/prometheus/common v0.32.1 h1:hWIdL3N2HoUx3B8j3YN9mWor0qhY/NlEKZEaXxuIRh4=
+github.com/prometheus/common v0.32.1/go.mod h1:vu+V0TpY+O6vW9J44gczi3Ap/oXXR10b+M/gUGO4Hls=
+github.com/prometheus/procfs v0.7.3 h1:4jVXhlkAyzOScmCkXBTOLRLTz8EeU+eyjrwB/EPq0VU=
+github.com/prometheus/procfs v0.7.3/go.mod h1:cz+aTbrPOrUb4q7XlbU9ygM+/jj0fzG6c1xBZuNvfVA=
 github.com/redis/go-redis/v9 v9.2.1 h1:WlYJg71ODF0dVspZZCpYmoF1+U1Jjk9Rwd7pq6QmlCg=
 github.com/redis/go-redis/v9 v9.2.1/go.mod h1:hdY0cQFCN4fnSYT6TkisLufl/4W5UIXyv0b/CLO2V2M=
+github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
+github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
+github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZVejAe8=
+github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=
 github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/shirou/gopsutil v3.21.4-0.20210419000835-c7a38de76ee5+incompatible h1:Bn1aCHHRnjv4Bl16T8rcaFjYSrGrIZvpiGO6P3Q4GpU=
+github.com/shirou/gopsutil v3.21.4-0.20210419000835-c7a38de76ee5+incompatible/go.mod h1:5b4v6he4MtMOwMlS0TUMTu2PcXUg8+E1lC7eC3UO/RA=
 github.com/shopspring/decimal v1.3.1 h1:2Usl1nmF/WZucqkFZhnfFYxxxu8LG21F6nPQBE5gKV8=
 github.com/shopspring/decimal v1.3.1/go.mod h1:DKyhrW/HYNuLGql+MJL6WCR6knT2jwCFRcu2hWCYk4o=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+github.com/supranational/blst v0.3.11 h1:LyU6FolezeWAhvQk0k6O/d49jqgO52MSDDfYgbeoEm4=
+github.com/supranational/blst v0.3.11/go.mod h1:jZJtfjgudtNl4en1tzwPIV3KjUnQUvG3/j+w+fVonLw=
+github.com/syndtr/goleveldb v1.0.1-0.20210819022825-2ae1ddf74ef7 h1:epCh84lMvA70Z7CTTCmYQn2CKbY8j86K7/FAIr141uY=
+github.com/syndtr/goleveldb v1.0.1-0.20210819022825-2ae1ddf74ef7/go.mod h1:q4W45IWZaF22tdD+VEXcAWRA037jwmWEB5VWYORlTpc=
+github.com/tklauser/go-sysconf v0.3.12 h1:0QaGUFOdQaIVdPgfITYzaTegZvdCjmYO52cSFAEVmqU=
+github.com/tklauser/go-sysconf v0.3.12/go.mod h1:Ho14jnntGE1fpdOqQEEaiKRpvIavV0hSfmBq8nJbHYI=
+github.com/tklauser/numcpus v0.6.1 h1:ng9scYS7az0Bk4OZLvrNXNSAO2Pxr1XXRAPyjhIx+Fk=
+github.com/tklauser/numcpus v0.6.1/go.mod h1:1XfjsgE2zo8GVw7POkMbHENHzVg3GzmoZ9fESEdAacY=
 github.com/urfave/cli/v2 v2.25.7 h1:VAzn5oq403l5pHjc4OhD54+XGO9cdKVL/7lDjF+iKUs=
 github.com/urfave/cli/v2 v2.25.7/go.mod h1:8qnjx1vcq5s2/wpsqoZFndg2CE5tNFyrTvS6SinrnYQ=
 github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 h1:bAn7/zixMGCfxrRTfdpNzjtPYqr8smhKouy9mxVdGPU=
@@ -46,15 +144,28 @@ go.uber.org/multierr v1.10.0 h1:S0h4aNzvfcFsC3dRF1jLoaov7oRaKqRGC/pUEJ2yvPQ=
 go.uber.org/multierr v1.10.0/go.mod h1:20+QtiLqy0Nd6FdQB9TLXag12DsQkrbs3htMFfDN80Y=
 go.uber.org/zap v1.26.0 h1:sI7k6L95XOKS281NhVKOFCUNIvv9e0w4BF8N3u+tCRo=
 go.uber.org/zap v1.26.0/go.mod h1:dtElttAiwGvoJ/vj4IwHBS/gXsEu/pZ50mUIRWuG0so=
-golang.org/x/net v0.14.0 h1:BONx9s002vGdD9umnlX1Po8vOZmrgH34qlHcD1MfK14=
-golang.org/x/net v0.14.0/go.mod h1:PpSgVXXLK0OxS0F31C1/tv6XNguvCrnXIDrFMspZIUI=
-golang.org/x/sys v0.11.0 h1:eG7RXZHdqOJ1i+0lgLgCpSXAp6M3LYlAo6osgSi0xOM=
-golang.org/x/sys v0.11.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/text v0.12.0 h1:k+n5B8goJNdU7hSvEtMUz3d1Q6D/XW4COJSJR6fN0mc=
-golang.org/x/text v0.12.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+golang.org/x/crypto v0.14.0 h1:wBqGXzWJW6m1XrIKlAH0Hs1JJ7+9KBwnIO8v66Q9cHc=
+golang.org/x/crypto v0.14.0/go.mod h1:MVFd36DqK4CsrnJYDkBA3VC4m2GkXAM0PvzMCn4JQf4=
+golang.org/x/exp v0.0.0-20230905200255-921286631fa9 h1:GoHiUyI/Tp2nVkLI2mCxVkOjsbSXD66ic0XW0js0R9g=
+golang.org/x/exp v0.0.0-20230905200255-921286631fa9/go.mod h1:S2oDrQGGwySpoQPVqRShND87VCbxmc6bL1Yd2oYrm6k=
+golang.org/x/net v0.17.0 h1:pVaXccu2ozPjCXewfr1S7xza/zcXTity9cCdXQYSjIM=
+golang.org/x/net v0.17.0/go.mod h1:NxSsAGuq816PNPmqtQdLE42eU2Fs7NoRIZrHJAlaCOE=
+golang.org/x/sync v0.3.0 h1:ftCYgMx6zT/asHUrPw8BLLscYtGznsLAnjq5RH9P66E=
+golang.org/x/sync v0.3.0/go.mod h1:FU7BRWz2tNW+3quACPkgCx/L+uEAv1htQ0V83Z9Rj+Y=
+golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
+golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/text v0.13.0 h1:ablQoSUd0tRdKxZewP80B+BaqeKJuVhuRxj/dkrun3k=
+golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
+google.golang.org/protobuf v1.28.0 h1:w43yiav+6bVFTBQFZX0r7ipe9JQ1QsbMgHwbBziscLw=
+google.golang.org/protobuf v1.28.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+rsc.io/tmplfunc v0.0.3 h1:53XFQh69AfOa8Tw0Jm7t+GV7KZhOi6jzsCzTtKbMvzU=
+rsc.io/tmplfunc v0.0.3/go.mod h1:AG3sTPzElb1Io3Yg4voV9AGZJuleGAwaVRxL9M49PhA=
diff --git a/mocks/blockchain_client.go b/mocks/blockchain_client.go
new file mode 100644
index 0000000..21723ab
--- /dev/null
+++ b/mocks/blockchain_client.go
@@ -0,0 +1,16 @@
+package mocks
+
+import (
+	"context"
+
+	"github.com/orbs-network/order-book/service"
+)
+
+type MockBcClient struct {
+	IsVerified bool
+	Error      error
+}
+
+func (m *MockBcClient) VerifySignature(ctx context.Context, input service.VerifySignatureInput) (bool, error) {
+	return m.IsVerified, m.Error
+}
diff --git a/scripts/coin-gecko/main.go b/scripts/coin-gecko/main.go
new file mode 100644
index 0000000..7f4d479
--- /dev/null
+++ b/scripts/coin-gecko/main.go
@@ -0,0 +1,100 @@
+// Takes a list of supported tokens on Polygon and formats them into a JSON file.
+// Usage: go run scripts/coin-gecko/main.go
+
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+)
+
+const endpoint = "https://tokens.coingecko.com/polygon-pos/all.json"
+
+type Token struct {
+	ChainID  int    `json:"chainId"`
+	Address  string `json:"address"`
+	Name     string `json:"name"`
+	Symbol   string `json:"symbol"`
+	Decimals int    `json:"decimals"`
+	LogoURI  string `json:"logoURI"`
+}
+
+func main() {
+	resp, err := http.Get(endpoint)
+	if err != nil {
+		fmt.Println("Error fetching data:", err)
+		return
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		fmt.Println("Failed to fetch data. Status code:", resp.StatusCode)
+		return
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		fmt.Println("Error reading response:", err)
+		return
+	}
+
+	var data map[string]interface{}
+	err = json.Unmarshal(body, &data)
+	if err != nil {
+		fmt.Println("Error decoding JSON:", err)
+		return
+	}
+
+	tokens, ok := data["tokens"].([]interface{})
+	if !ok {
+		fmt.Println("No tokens found in the response.")
+		return
+	}
+
+	formattedTokens := make(map[string]map[string]interface{})
+
+	for _, token := range tokens {
+		tok, ok := token.(map[string]interface{})
+		if !ok {
+			continue
+		}
+
+		symbol, ok := tok["symbol"].(string)
+		if !ok {
+			continue
+		}
+
+		address, ok := tok["address"].(string)
+		if !ok {
+			continue
+		}
+
+		decimals, ok := tok["decimals"].(float64)
+		if !ok {
+			continue
+		}
+
+		formattedTokens[symbol] = map[string]interface{}{
+			"address":  address,
+			"decimals": decimals,
+		}
+	}
+
+	outputFile := "supportedTokens.json"
+	outputJSON, err := json.MarshalIndent(formattedTokens, "", "    ")
+	if err != nil {
+		fmt.Println("Error encoding JSON:", err)
+		return
+	}
+
+	err = os.WriteFile(outputFile, outputJSON, 0644)
+	if err != nil {
+		fmt.Println("Error writing to file:", err)
+		return
+	}
+
+	fmt.Printf("Formatted tokens saved to %s\n", outputFile)
+}
diff --git a/scripts/signing/main.go b/scripts/signing/main.go
new file mode 100644
index 0000000..cd88312
--- /dev/null
+++ b/scripts/signing/main.go
@@ -0,0 +1,37 @@
+// A quick script to test EIP712 signature verification
+// Usage: go run scripts/signing/main.go
+
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+
+	"github.com/orbs-network/order-book/service"
+)
+
+var sig = "0x977939edfd70b5e0a802b0874fa681749ac3669516f8250fc11426bd3d02e3f353a874aec1d1394965507c7404a24a53cc4427917c2b214a695ea432aa79ccba1b"
+
+var pubKey = "0x6a04ab98d9e4774ad806e302dddeb63bea16b5cb5f223ee77478e861bb583eb336b6fbcb60b5b3d4f1551ac45e5ffc4936466e7d98f6c7c0ec736539f74691a6"
+
+var message = `{"permitted": {"token": "0x3c499c542cef5e3811e1192ce70d8cc03d5c3359", "amount": 10000000}, "spender": "0x21Da9737764527e75C17F1AB26Cb668b66dEE0a0", "nonce": 557404199, "deadline": 1709481491, "witness": {"info": {"reactor": "0x21Da9737764527e75C17F1AB26Cb668b66dEE0a0", "swapper": "0xE3682CCecefBb3C3fe524BbFF1598B2BBaC0d6E3", "nonce": 557404199, "deadline": 1709481491, "additionalValidationContract": "0x1a08D64Fb4a7D0b6DA5606A1e4619c147C3fB95e", "additionalValidationData": "0x"}, "exclusiveFiller": "0x1a08D64Fb4a7D0b6DA5606A1e4619c147C3fB95e", "exclusivityOverrideBps": 0, "input": {"token": "0x3c499c542cef5e3811e1192ce70d8cc03d5c3359", "amount": 10000000}, "outputs": [{"token": "0x11cd37bb86f65419713f30673a480ea33c826872", "amount": 1000000000000000, "recipient": "0x8fd379246834eac74B8419FfdA202CF8051F7A03"}]}}`
+
+func main() {
+
+	client := service.EthereumClient{}
+
+	ctx := context.Background()
+
+	verified, err := client.VerifySignature(ctx, service.VerifySignatureInput{
+		MessageData: message,
+		Signature:   sig,
+		PublicKey:   pubKey,
+	})
+
+	if err != nil {
+		log.Fatalf("Error verifying signature: %v", err)
+	}
+
+	fmt.Printf("Signature verified: %v\n", verified)
+}
diff --git a/service/cancel_order_test.go b/service/cancel_order_test.go
index e17a98a..a6e55ba 100644
--- a/service/cancel_order_test.go
+++ b/service/cancel_order_test.go
@@ -20,6 +20,8 @@ func TestService_CancelOrder(t *testing.T) {
 	clientOId := uuid.MustParse("f577273e-12de-4acc-a4f8-de7fb5b86e37")
 	order := &models.Order{Id: orderId, UserId: userId, Status: models.STATUS_OPEN, ClientOId: clientOId}
 
+	mockBcClient := &mocks.MockBcClient{IsVerified: true}
+
 	testCases := []struct {
 		name            string
 		order           *models.Order
@@ -41,7 +43,7 @@ func TestService_CancelOrder(t *testing.T) {
 	for _, c := range testCases {
 		t.Run(c.name, func(t *testing.T) {
 			fmt.Print(c.name)
-			svc, _ := service.New(&mocks.MockOrderBookStore{Order: c.order, Error: c.err})
+			svc, _ := service.New(&mocks.MockOrderBookStore{Order: c.order, Error: c.err}, mockBcClient)
 
 			input := service.CancelOrderInput{Id: orderId, IsClientOId: false, UserId: userId}
 
diff --git a/service/cancel_orders_for_user_test.go b/service/cancel_orders_for_user_test.go
index 1f5b002..739c6cc 100644
--- a/service/cancel_orders_for_user_test.go
+++ b/service/cancel_orders_for_user_test.go
@@ -11,11 +11,12 @@ import (
 
 func TestService_CancelOrdersForUser(t *testing.T) {
 	ctx := context.Background()
+	mockBcClient := &mocks.MockBcClient{IsVerified: true}
 
 	t.Run("should successfully cancel all orders for a user", func(t *testing.T) {
 		store := &mocks.MockOrderBookStore{User: &mocks.User}
 
-		s, _ := service.New(store)
+		s, _ := service.New(store, mockBcClient)
 
 		err := s.CancelOrdersForUser(ctx, mocks.UserId)
 		assert.Equal(t, err, nil)
@@ -24,7 +25,7 @@ func TestService_CancelOrdersForUser(t *testing.T) {
 	t.Run("should return error on unexpected error", func(t *testing.T) {
 		store := &mocks.MockOrderBookStore{User: nil, Error: assert.AnError}
 
-		s, _ := service.New(store)
+		s, _ := service.New(store, mockBcClient)
 
 		err := s.CancelOrdersForUser(ctx, mocks.UserId)
 		assert.ErrorContains(t, err, "could not cancel orders for user")
diff --git a/service/ethereum.go b/service/ethereum.go
new file mode 100644
index 0000000..64161d0
--- /dev/null
+++ b/service/ethereum.go
@@ -0,0 +1,182 @@
+package service
+
+import (
+	"bytes"
+	"context"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/math"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/signer/core/apitypes"
+	"github.com/orbs-network/order-book/utils/logger"
+	"github.com/orbs-network/order-book/utils/logger/logctx"
+)
+
+type EthereumClient struct{}
+
+type VerifySignatureInput struct {
+	// A JSON string representing the message data that was signed
+	MessageData string
+	// The public key of the user that purportedly signed the message
+	PublicKey string
+	// The signature of the message
+	Signature string
+}
+
+// Returns true if the signature is valid (the `PublicKey` matches the recovered one from the `Signature`), false otherwise
+//
+// https://blog.hook.xyz/validate-eip-712/
+func (e *EthereumClient) VerifySignature(ctx context.Context, input VerifySignatureInput) (bool, error) {
+	// Prepend "04" to the public key to ensure it's in the uncompressed format
+	fullPubKey := "04" + strings.TrimPrefix(input.PublicKey, "0x")
+
+	// Decode the hex-encoded public key
+	pubKeyBytes, err := hex.DecodeString(fullPubKey)
+	if err != nil {
+		logctx.Error(ctx, "error decoding hex public key", logger.Error(err), logger.String("publicKey", fullPubKey), logger.String("signature", input.Signature), logger.String("messageData", input.MessageData))
+		return false, fmt.Errorf("error decoding hex public key: %v", err)
+	}
+
+	// Validate the format and length of the public key
+	if len(pubKeyBytes) != 65 || pubKeyBytes[0] != 4 {
+		logctx.Error(ctx, "invalid public key format", logger.String("publicKey", fullPubKey), logger.String("signature", input.Signature), logger.String("messageData", input.MessageData))
+		return false, fmt.Errorf("invalid public key format")
+	}
+
+	// Convert the byte representation of the public key to an ECDSA public key
+	pubKey, err := crypto.UnmarshalPubkey(pubKeyBytes)
+	if err != nil {
+		logctx.Error(ctx, "failed to unmarshal public key", logger.Error(err), logger.String("publicKey", fullPubKey), logger.String("signature", input.Signature), logger.String("messageData", input.MessageData))
+		return false, fmt.Errorf("failed to unmarshal public key: %v", err)
+	}
+
+	// Decode the hex-encoded signature
+	signatureBytes, err := hex.DecodeString(strings.TrimPrefix(input.Signature, "0x"))
+	if err != nil {
+		logctx.Error(ctx, "error decoding hex signature", logger.Error(err), logger.String("publicKey", fullPubKey), logger.String("signature", input.Signature), logger.String("messageData", input.MessageData))
+		return false, fmt.Errorf("failed to decode signature: %v", err)
+	}
+
+	// Normalize the `v` value in the signature (adjust for Ethereum's signature format)
+	v := signatureBytes[64]
+	if v == 27 || v == 28 {
+		logctx.Info(ctx, "signature v value is normalized", logger.String("publicKey", fullPubKey), logger.String("signature", input.Signature), logger.String("messageData", input.MessageData))
+		v -= 27
+		signatureBytes[64] = v
+	}
+
+	// EIP712 domain
+	domain := apitypes.TypedDataDomain{
+		Name:              "Permit2",
+		ChainId:           math.NewHexOrDecimal256(137),
+		VerifyingContract: "0x000000000022d473030f116ddee9f6b43ac78ba3",
+	}
+
+	// TODO: confirm with Zlotin rePermit payload
+	// EIP712 message types
+	types := apitypes.Types{
+		"EIP712Domain": {
+			{Name: "name", Type: "string"},
+			{Name: "chainId", Type: "uint256"},
+			{Name: "verifyingContract", Type: "address"},
+		},
+		"PermitWitnessTransferFrom": {
+			{Name: "permitted", Type: "TokenPermissions"},
+			{Name: "spender", Type: "address"},
+			{Name: "nonce", Type: "uint256"},
+			{Name: "deadline", Type: "uint256"},
+			{Name: "witness", Type: "PartialOrder"},
+		},
+		"TokenPermissions": {
+			{Name: "token", Type: "address"},
+			{Name: "amount", Type: "uint256"},
+		},
+		"PartialOrder": {
+			{Name: "info", Type: "OrderInfo"},
+			{Name: "exclusiveFiller", Type: "address"},
+			{Name: "exclusivityOverrideBps", Type: "uint256"},
+			{Name: "input", Type: "PartialInput"},
+			{Name: "outputs", Type: "PartialOutput[]"},
+		},
+		"OrderInfo": {
+			{Name: "reactor", Type: "address"},
+			{Name: "swapper", Type: "address"},
+			{Name: "nonce", Type: "uint256"},
+			{Name: "deadline", Type: "uint256"},
+			{Name: "additionalValidationContract", Type: "address"},
+			{Name: "additionalValidationData", Type: "bytes"},
+		},
+		"PartialInput": {
+			{Name: "token", Type: "address"},
+			{Name: "amount", Type: "uint256"},
+		},
+		"PartialOutput": {
+			{Name: "token", Type: "address"},
+			{Name: "amount", Type: "uint256"},
+			{Name: "recipient", Type: "address"},
+		},
+	}
+
+	// Unmarshal the message
+	var message map[string]interface{}
+	if err := json.Unmarshal([]byte(input.MessageData), &message); err != nil {
+		logctx.Error(ctx, "failed to unmarshal message", logger.Error(err), logger.String("publicKey", fullPubKey), logger.String("signature", input.Signature), logger.String("messageData", input.MessageData))
+		return false, fmt.Errorf("failed to unmarshal message: %v", err)
+	}
+
+	// Create the TypedData object
+	typedData := apitypes.TypedData{
+		PrimaryType: "PermitWitnessTransferFrom",
+		Types:       types,
+		Domain:      domain,
+		Message:     message,
+	}
+
+	// Hash the message data
+	dataHash, err := typedData.HashStruct(typedData.PrimaryType, typedData.Message)
+	if err != nil {
+		logctx.Error(ctx, "failed to hash structured data", logger.Error(err), logger.String("publicKey", fullPubKey), logger.String("signature", input.Signature), logger.String("messageData", input.MessageData))
+		return false, fmt.Errorf("failed to hash structured data: %v", err)
+	}
+
+	// Hash the domain separator
+	domainSeparator, err := typedData.HashStruct("EIP712Domain", typedData.Domain.Map())
+	if err != nil {
+		logctx.Error(ctx, "failed to hash domain separator", logger.Error(err), logger.String("publicKey", fullPubKey), logger.String("signature", input.Signature), logger.String("messageData", input.MessageData))
+		return false, fmt.Errorf("failed to hash domain separator: %v", err)
+	}
+
+	// Reconstruct the exact message that was signed - concatenate the domain separator and the hash of the data
+	rawData := []byte(fmt.Sprintf("\x19\x01%s%s", string(domainSeparator), string(dataHash)))
+
+	// Compute the Keccak256 hash of the final message
+	hashBytes := crypto.Keccak256(rawData)
+	hash := common.BytesToHash(hashBytes)
+
+	// Recover the public key from the signature
+	recoveredPub, err := crypto.SigToPub(hash.Bytes(), signatureBytes)
+	if err != nil {
+		logctx.Error(ctx, "failed to recover public key from signature", logger.Error(err), logger.String("publicKey", fullPubKey), logger.String("signature", input.Signature), logger.String("messageData", input.MessageData))
+		return false, fmt.Errorf("failed to recover public key from signature: %v", err)
+	}
+
+	// Convert the recovered public key to bytes
+	recoveredPubBytes := crypto.FromECDSAPub(recoveredPub)
+
+	// Convert the original public key to bytes
+	originalPubBytes := crypto.FromECDSAPub(pubKey)
+
+	// Compare the recovered public key with the original public key
+	if !bytes.Equal(recoveredPubBytes, originalPubBytes) {
+		logctx.Warn(ctx, "signature does not match", logger.String("recoveredPub", hex.EncodeToString(recoveredPubBytes)), logger.String("originalPub", hex.EncodeToString(originalPubBytes)))
+		return false, fmt.Errorf("signature does not match")
+	}
+
+	logctx.Info(ctx, "signature is valid", logger.String("recoveredPub", hex.EncodeToString(recoveredPubBytes)), logger.String("originalPub", hex.EncodeToString(originalPubBytes)))
+	// Signature is valid
+	return true, nil
+}
diff --git a/service/ethereum_test.go b/service/ethereum_test.go
new file mode 100644
index 0000000..9fa6a7a
--- /dev/null
+++ b/service/ethereum_test.go
@@ -0,0 +1,58 @@
+package service
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+var sig = "0xdbf6d13ed9b1af881499ce25b4a9f40604c74b65ea1a871edec9e762950a4460502d126fe40b23f530caf4af7dc2f8629014b64a12b94fd0cb17c5569b2a05661c"
+
+var pubKey = "0x6a04ab98d9e4774ad806e302dddeb63bea16b5cb5f223ee77478e861bb583eb336b6fbcb60b5b3d4f1551ac45e5ffc4936466e7d98f6c7c0ec736539f74691a6"
+
+var message = `{"permitted": {"token": "0x3c499c542cef5e3811e1192ce70d8cc03d5c3359", "amount": "20000000000"}, "spender": "0x21Da9737764527e75C17F1AB26Cb668b66dEE0a0", "nonce": 845753781, "deadline": 1709657651, "witness": {"info": {"reactor": "0x21Da9737764527e75C17F1AB26Cb668b66dEE0a0", "swapper": "0xE3682CCecefBb3C3fe524BbFF1598B2BBaC0d6E3", "nonce": 845753781, "deadline": 1709657651, "additionalValidationContract": "0x1a08D64Fb4a7D0b6DA5606A1e4619c147C3fB95e", "additionalValidationData": "0x"}, "exclusiveFiller": "0x1a08D64Fb4a7D0b6DA5606A1e4619c147C3fB95e", "exclusivityOverrideBps": 0, "input": {"token": "0x3c499c542cef5e3811e1192ce70d8cc03d5c3359", "amount": "20000000000"}, "outputs": [{"token": "0x11cd37bb86f65419713f30673a480ea33c826872", "amount": "10000000000000000000", "recipient": "0x8fd379246834eac74B8419FfdA202CF8051F7A03"}]}}`
+
+func TestEthereumClient_VerifySignature(t *testing.T) {
+	ctx := context.TODO()
+	ethereumClient := &EthereumClient{}
+
+	t.Run("successfully verify signature - should return true", func(t *testing.T) {
+		input := VerifySignatureInput{
+			PublicKey:   pubKey,
+			Signature:   sig,
+			MessageData: message,
+		}
+
+		result, err := ethereumClient.VerifySignature(ctx, input)
+
+		assert.NoError(t, err)
+		assert.True(t, result)
+	})
+
+	t.Run("invalid public key  - should return false", func(t *testing.T) {
+		input := VerifySignatureInput{
+			PublicKey:   "0x123",
+			Signature:   sig,
+			MessageData: message,
+		}
+
+		result, err := ethereumClient.VerifySignature(ctx, input)
+
+		assert.ErrorContains(t, err, "error decoding hex public key")
+		assert.False(t, result)
+	})
+
+	t.Run("failed to unmarshal message - should return false", func(t *testing.T) {
+		input := VerifySignatureInput{
+			PublicKey:   pubKey,
+			Signature:   sig,
+			MessageData: "invalid message",
+		}
+
+		result, err := ethereumClient.VerifySignature(ctx, input)
+
+		assert.ErrorContains(t, err, "failed to unmarshal message")
+		assert.False(t, result)
+	})
+}
diff --git a/service/get_order_by_client_oid_test.go b/service/get_order_by_client_oid_test.go
index 5927e8e..3697bfd 100644
--- a/service/get_order_by_client_oid_test.go
+++ b/service/get_order_by_client_oid_test.go
@@ -17,9 +17,11 @@ func TestService_GetOrderByClientOId(t *testing.T) {
 
 	clientOId := uuid.MustParse("e577273e-12de-4acc-a4f8-de7fb5b86e37")
 
+	mockBcClient := &mocks.MockBcClient{IsVerified: true}
+
 	t.Run("successfully retrieve order by client order ID - should return order", func(t *testing.T) {
 		o := &models.Order{ClientOId: clientOId}
-		svc, _ := service.New(&mocks.MockOrderBookStore{Order: o})
+		svc, _ := service.New(&mocks.MockOrderBookStore{Order: o}, mockBcClient)
 
 		order, err := svc.GetOrderByClientOId(ctx, clientOId)
 
@@ -28,7 +30,7 @@ func TestService_GetOrderByClientOId(t *testing.T) {
 	})
 
 	t.Run("order not found - should return nil", func(t *testing.T) {
-		svc, _ := service.New(&mocks.MockOrderBookStore{Error: models.ErrOrderNotFound})
+		svc, _ := service.New(&mocks.MockOrderBookStore{Error: models.ErrOrderNotFound}, mockBcClient)
 
 		order, err := svc.GetOrderByClientOId(ctx, clientOId)
 
@@ -37,7 +39,7 @@ func TestService_GetOrderByClientOId(t *testing.T) {
 	})
 
 	t.Run("unexpected error - should return error", func(t *testing.T) {
-		svc, _ := service.New(&mocks.MockOrderBookStore{Error: assert.AnError})
+		svc, _ := service.New(&mocks.MockOrderBookStore{Error: assert.AnError}, mockBcClient)
 
 		order, err := svc.GetOrderByClientOId(ctx, clientOId)
 
diff --git a/service/get_symbols_test.go b/service/get_symbols_test.go
index 40b5b29..f5dd5e8 100644
--- a/service/get_symbols_test.go
+++ b/service/get_symbols_test.go
@@ -11,7 +11,7 @@ import (
 
 func TestService_GetSymbols(t *testing.T) {
 	ctx := context.Background()
-	svc, _ := service.New(&mocks.MockOrderBookStore{})
+	svc, _ := service.New(&mocks.MockOrderBookStore{}, &mocks.MockBcClient{})
 
 	symbols, err := svc.GetSymbols(ctx)
 
diff --git a/service/get_user_by_public_key_test.go b/service/get_user_by_public_key_test.go
index ef47a6c..a5fd8ee 100644
--- a/service/get_user_by_public_key_test.go
+++ b/service/get_user_by_public_key_test.go
@@ -13,11 +13,12 @@ import (
 func TestService_GetUserByPublicKey(t *testing.T) {
 
 	ctx := context.Background()
+	mockBcClient := &mocks.MockBcClient{IsVerified: true}
 
 	t.Run("should get a user by their public key", func(t *testing.T) {
 		store := &mocks.MockOrderBookStore{User: &mocks.User}
 
-		svc, _ := service.New(store)
+		svc, _ := service.New(store, mockBcClient)
 
 		user, _ := svc.GetUserByPublicKey(ctx, mocks.PubKey)
 
@@ -27,7 +28,7 @@ func TestService_GetUserByPublicKey(t *testing.T) {
 	t.Run("should return error if user not found", func(t *testing.T) {
 		store := &mocks.MockOrderBookStore{User: nil, ErrUser: models.ErrUserNotFound}
 
-		svc, _ := service.New(store)
+		svc, _ := service.New(store, mockBcClient)
 
 		user, err := svc.GetUserByPublicKey(ctx, mocks.PubKey)
 
@@ -38,7 +39,7 @@ func TestService_GetUserByPublicKey(t *testing.T) {
 	t.Run("should return error on unexpected error getting user by public key", func(t *testing.T) {
 		store := &mocks.MockOrderBookStore{User: nil, ErrUser: assert.AnError}
 
-		svc, _ := service.New(store)
+		svc, _ := service.New(store, mockBcClient)
 
 		user, err := svc.GetUserByPublicKey(ctx, mocks.PubKey)
 
@@ -49,7 +50,7 @@ func TestService_GetUserByPublicKey(t *testing.T) {
 	t.Run("should return error if user is nil but no error", func(t *testing.T) {
 		store := &mocks.MockOrderBookStore{User: nil, ErrUser: nil}
 
-		svc, _ := service.New(store)
+		svc, _ := service.New(store, mockBcClient)
 
 		user, err := svc.GetUserByPublicKey(ctx, mocks.PubKey)
 
diff --git a/service/process_order_test.go b/service/process_order_test.go
index 65818e6..cf94d48 100644
--- a/service/process_order_test.go
+++ b/service/process_order_test.go
@@ -16,6 +16,7 @@ import (
 func TestService_ProcessOrder(t *testing.T) {
 
 	ctx := context.Background()
+	mockBcClient := &mocks.MockBcClient{IsVerified: true}
 
 	symbol, _ := models.StrToSymbol("USDC-ETH")
 	userId := uuid.MustParse("a577273e-12de-4acc-a4f8-de7fb5b86e37")
@@ -40,7 +41,7 @@ func TestService_ProcessOrder(t *testing.T) {
 			ClientOrderID: orderId,
 		}
 
-		svc, _ := service.New(&mocks.MockOrderBookStore{User: &user, Error: assert.AnError})
+		svc, _ := service.New(&mocks.MockOrderBookStore{User: &user, Error: assert.AnError}, mockBcClient)
 
 		order, err := svc.ProcessOrder(ctx, input)
 
@@ -58,7 +59,7 @@ func TestService_ProcessOrder(t *testing.T) {
 			ClientOrderID: orderId,
 		}
 
-		svc, _ := service.New(&mocks.MockOrderBookStore{User: &user, Order: nil})
+		svc, _ := service.New(&mocks.MockOrderBookStore{User: &user, Order: nil}, mockBcClient)
 
 		newOrder, err := svc.ProcessOrder(ctx, input)
 
@@ -85,7 +86,7 @@ func TestService_ProcessOrder(t *testing.T) {
 			ClientOrderID: orderId,
 		}
 
-		svc, _ := service.New(&mocks.MockOrderBookStore{User: &user, Order: &models.Order{UserId: uuid.MustParse("b577273e-12de-4acc-a4f8-de7fb5b86e37")}})
+		svc, _ := service.New(&mocks.MockOrderBookStore{User: &user, Order: &models.Order{UserId: uuid.MustParse("b577273e-12de-4acc-a4f8-de7fb5b86e37")}}, mockBcClient)
 
 		order, err := svc.ProcessOrder(ctx, input)
 
@@ -103,7 +104,7 @@ func TestService_ProcessOrder(t *testing.T) {
 			ClientOrderID: orderId,
 		}
 
-		svc, _ := service.New(&mocks.MockOrderBookStore{User: &user, Order: &models.Order{ClientOId: orderId, UserId: userId}})
+		svc, _ := service.New(&mocks.MockOrderBookStore{User: &user, Order: &models.Order{ClientOId: orderId, UserId: userId}}, mockBcClient)
 
 		order, err := svc.ProcessOrder(ctx, input)
 
diff --git a/service/service.go b/service/service.go
index d99bd9d..62841be 100644
--- a/service/service.go
+++ b/service/service.go
@@ -30,16 +30,25 @@ type OrderBookService interface {
 	GetAmountOut(ctx context.Context, auctionID uuid.UUID, symbol models.Symbol, side models.Side, amountIn decimal.Decimal) (models.AmountOut, error)
 }
 
+type BlockChainService interface {
+	VerifySignature(ctx context.Context, input VerifySignatureInput) (bool, error)
+}
+
 // Service contains methods that implement the business logic for the application.
 type Service struct {
-	orderBookStore store.OrderBookStore
+	orderBookStore   store.OrderBookStore
+	blockchainClient BlockChainService
 }
 
 // New creates a new Service with injected dependencies.
-func New(store store.OrderBookStore) (*Service, error) {
+func New(store store.OrderBookStore, bcClient BlockChainService) (*Service, error) {
 	if store == nil {
 		return nil, errors.New("store cannot be nil")
 	}
 
-	return &Service{orderBookStore: store}, nil
+	if bcClient == nil {
+		return nil, errors.New("bcClient cannot be nil")
+	}
+
+	return &Service{orderBookStore: store, blockchainClient: bcClient}, nil
 }
diff --git a/transport/rest/auction_test.go b/transport/rest/auction_test.go
index e543076..70225ca 100644
--- a/transport/rest/auction_test.go
+++ b/transport/rest/auction_test.go
@@ -25,8 +25,9 @@ var httpServer *rest.HTTPServer
 
 func runAuctionServer(t *testing.T) {
 	repository := mocks.CreateAuctionMock()
+	mockBcClient := &mocks.MockBcClient{IsVerified: true}
 
-	service, err := service.New(repository)
+	service, err := service.New(repository, mockBcClient)
 	if err != nil {
 		log.Fatalf("error creating service: %v", err)
 	}