diff --git a/apps/docs/package.json b/apps/docs/package.json
index b4de2d237..889703377 100644
--- a/apps/docs/package.json
+++ b/apps/docs/package.json
@@ -16,6 +16,7 @@
         "@docusaurus/core": "3.1.1",
         "@docusaurus/preset-classic": "3.1.1",
         "@mdx-js/react": "^3.0.0",
+        "@semaphore-protocol/utils": "4.0.0-beta.4",
         "@svgr/webpack": "^5.5.0",
         "clsx": "^1.2.1",
         "docusaurus-plugin-sass": "^0.2.5",
diff --git a/apps/docs/src/components/DeployedContracts.tsx b/apps/docs/src/components/DeployedContracts.tsx
index c7a3e1fb0..5c6de18f8 100644
--- a/apps/docs/src/components/DeployedContracts.tsx
+++ b/apps/docs/src/components/DeployedContracts.tsx
@@ -1,5 +1,5 @@
+import { deployedContracts } from "@semaphore-protocol/utils"
 import Heading from "@theme/Heading"
-import { useEffect, useState } from "react"
 
 function capitalizeFirstLetter(s: string): string {
     return s.charAt(0).toUpperCase() + s.slice(1)
@@ -23,17 +23,6 @@ function getEtherscanLink(network: string): string {
 }
 
 export default function DeployedContracts() {
-    const [deployedContracts, setDeployedContracts] = useState<any[]>([])
-
-    useEffect(() => {
-        fetch(
-            "https://raw.githubusercontent.com/semaphore-protocol/semaphore/main/packages/contracts/deployed-contracts.json"
-        )
-            .then((response) => response.json())
-            .catch(() => [])
-            .then(setDeployedContracts)
-    }, [])
-
     return (
         <div>
             {deployedContracts.map(({ network, contracts }) => (
diff --git a/packages/cli/src/index.ts b/packages/cli/src/index.ts
index d3304d5ca..39881ac8f 100644
--- a/packages/cli/src/index.ts
+++ b/packages/cli/src/index.ts
@@ -1,5 +1,5 @@
 import { GroupResponse, SemaphoreEthers, SemaphoreSubgraph } from "@semaphore-protocol/data"
-import supportedNetworks from "@semaphore-protocol/utils/supported-networks"
+import { supportedNetworks } from "@semaphore-protocol/utils/networks"
 import chalk from "chalk"
 import { program } from "commander"
 import decompress from "decompress"
diff --git a/packages/contracts/deployed-contracts.json b/packages/contracts/deployed-contracts.json
index 6aaf0a7db..c56554460 100644
--- a/packages/contracts/deployed-contracts.json
+++ b/packages/contracts/deployed-contracts.json
@@ -12,7 +12,8 @@
             },
             {
                 "name": "Semaphore",
-                "address": "0x5B8e7cC7bAC61A4b952d472b67056B2f260ba6dc"
+                "address": "0x5B8e7cC7bAC61A4b952d472b67056B2f260ba6dc",
+                "startBlock": 5150903
             }
         ]
     }
diff --git a/packages/contracts/hardhat.config.ts b/packages/contracts/hardhat.config.ts
index 0500f2401..c85c498b9 100644
--- a/packages/contracts/hardhat.config.ts
+++ b/packages/contracts/hardhat.config.ts
@@ -2,6 +2,7 @@ import "@nomicfoundation/hardhat-chai-matchers"
 import "@nomicfoundation/hardhat-ethers"
 import "@nomicfoundation/hardhat-verify"
 import "@openzeppelin/hardhat-upgrades"
+import { SupportedNetwork } from "@semaphore-protocol/utils"
 import "@typechain/hardhat"
 import { config as dotenvConfig } from "dotenv"
 import "hardhat-gas-reporter"
@@ -22,7 +23,7 @@ function getNetworks(): NetworksUserConfig {
     const infuraApiKey = process.env.INFURA_API_KEY
     const accounts = [`0x${process.env.BACKEND_PRIVATE_KEY}`]
 
-    return {
+    const networks: Record<SupportedNetwork, any> = {
         sepolia: {
             url: `https://sepolia.infura.io/v3/${infuraApiKey}`,
             chainId: 11155111,
@@ -49,6 +50,8 @@ function getNetworks(): NetworksUserConfig {
             accounts
         }
     }
+
+    return networks
 }
 
 const hardhatConfig: HardhatUserConfig = {
diff --git a/packages/contracts/package.json b/packages/contracts/package.json
index 6438e2418..1f9bab4e3 100644
--- a/packages/contracts/package.json
+++ b/packages/contracts/package.json
@@ -21,6 +21,7 @@
         "@nomicfoundation/hardhat-verify": "^2.0.0",
         "@openzeppelin/hardhat-upgrades": "^3.0.4",
         "@semaphore-protocol/core": "workspace:packages/core",
+        "@semaphore-protocol/utils": "workspace:packages/utils",
         "@typechain/ethers-v6": "^0.5.0",
         "@typechain/hardhat": "^9.0.0",
         "@types/chai": "^4.2.0",
diff --git a/packages/contracts/scripts/utils.ts b/packages/contracts/scripts/utils.ts
index 71d6d1fe2..4ac047542 100644
--- a/packages/contracts/scripts/utils.ts
+++ b/packages/contracts/scripts/utils.ts
@@ -1,8 +1,10 @@
+import { SupportedNetwork, supportedNetworks } from "@semaphore-protocol/utils"
 import { readFileSync, writeFileSync } from "fs"
 
 export type NetworkDeployedContracts = {
     name: "Semaphore" | "SemaphoreVerifier" | "PoseidonT3"
     address: string
+    startBlock?: number
 }[]
 
 export type DeployedContracts = {
@@ -10,8 +12,6 @@ export type DeployedContracts = {
     contracts: NetworkDeployedContracts
 }[]
 
-const supportedNetworks = ["sepolia", "arbitrum", "mumbai", "optimism-sepolia", "arbitrum-sepolia"]
-
 export function getDeployedContracts(): DeployedContracts {
     return JSON.parse(readFileSync(`./deployed-contracts.json`, "utf8"))
 }
@@ -38,7 +38,7 @@ export function getDeployedContractAddress(network: string, contractName: string
     return semaphoreAddress.address
 }
 
-export function saveDeployedContracts(contracts: NetworkDeployedContracts, network?: string) {
+export function saveDeployedContracts(contracts: NetworkDeployedContracts, network?: SupportedNetwork) {
     if (network && supportedNetworks.includes(network)) {
         const deployedContracts = getDeployedContracts() as DeployedContracts
 
diff --git a/packages/contracts/tasks/deploy.ts b/packages/contracts/tasks/deploy.ts
index af8224305..8b0657acf 100644
--- a/packages/contracts/tasks/deploy.ts
+++ b/packages/contracts/tasks/deploy.ts
@@ -1,3 +1,4 @@
+import { SupportedNetwork } from "@semaphore-protocol/utils"
 import { task, types } from "hardhat/config"
 import { saveDeployedContracts } from "../scripts/utils"
 import { deployContract } from "./utils"
@@ -51,6 +52,8 @@ task("deploy", "Deploy a Semaphore contract")
                 console.info(`Semaphore contract has been deployed to: ${semaphoreAddress}`)
             }
 
+            const deploymentTransaction = semaphore.deploymentTransaction()
+
             saveDeployedContracts(
                 [
                     {
@@ -63,10 +66,14 @@ task("deploy", "Deploy a Semaphore contract")
                     },
                     {
                         name: "Semaphore",
-                        address: semaphoreAddress
+                        address: semaphoreAddress,
+                        startBlock:
+                            deploymentTransaction && deploymentTransaction.blockNumber
+                                ? deploymentTransaction.blockNumber
+                                : undefined
                     }
                 ],
-                hardhatArguments.network
+                hardhatArguments.network as SupportedNetwork
             )
 
             return {
diff --git a/packages/contracts/tasks/utils.ts b/packages/contracts/tasks/utils.ts
index 2c0facb0d..79eaa9e29 100644
--- a/packages/contracts/tasks/utils.ts
+++ b/packages/contracts/tasks/utils.ts
@@ -11,11 +11,9 @@ export async function deployContract(
 
     if (network !== undefined && network !== "hardhat" && network !== "localhost") {
         contract = await defender.deployContract(contractFactory, args, { salt: process.env.CREATE2_SALT })
-
-        await contract.waitForDeployment()
     } else {
         contract = await contractFactory.deploy(...args)
     }
 
-    return contract
+    return contract.waitForDeployment()
 }
diff --git a/packages/data/package.json b/packages/data/package.json
index 8e785f442..e8d6a8904 100644
--- a/packages/data/package.json
+++ b/packages/data/package.json
@@ -37,6 +37,7 @@
         "rollup-plugin-cleanup": "^3.2.1"
     },
     "dependencies": {
+        "@semaphore-protocol/utils": "4.0.0-beta.4",
         "axios": "1.6.6",
         "ethers": "6.11.0"
     }
diff --git a/packages/data/src/ethers.ts b/packages/data/src/ethers.ts
index e6f790a39..fa6439b1f 100644
--- a/packages/data/src/ethers.ts
+++ b/packages/data/src/ethers.ts
@@ -1,3 +1,5 @@
+import { SupportedNetwork, getDeployedContract, supportedNetworks } from "@semaphore-protocol/utils"
+import { defaultNetwork } from "@semaphore-protocol/utils/networks"
 import { ZeroAddress } from "ethers/constants"
 import { Contract } from "ethers/contract"
 import {
@@ -25,7 +27,7 @@ export default class SemaphoreEthers {
      * @param networkOrEthereumURL Ethereum network or custom URL.
      * @param options Ethers options.
      */
-    constructor(networkOrEthereumURL: EthersNetwork | string = "sepolia", options: EthersOptions = {}) {
+    constructor(networkOrEthereumURL: EthersNetwork | string = defaultNetwork, options: EthersOptions = {}) {
         checkParameter(networkOrEthereumURL, "networkOrSubgraphURL", "string")
 
         if (options.provider) {
@@ -42,33 +44,17 @@ export default class SemaphoreEthers {
             networkOrEthereumURL = "maticmum"
         }
 
-        switch (networkOrEthereumURL) {
-            case "arbitrum":
-                options.address ??= "0xc60E0Ee1a2770d5F619858C641f14FC4a6401520"
-                options.startBlock ??= 77278430
-                break
-            case "arbitrum-sepolia":
-                options.address ??= "0x3889927F0B5Eb1a02C6E2C20b39a1Bd4EAd76131"
-                options.startBlock ??= 15174410
-                break
-            case "maticmum":
-                options.address ??= "0x3889927F0B5Eb1a02C6E2C20b39a1Bd4EAd76131"
-                options.startBlock ??= 33995010
-                break
-            case "sepolia":
-                options.address ??= "0x5B8e7cC7bAC61A4b952d472b67056B2f260ba6dc"
-                options.startBlock ??= 5150903
-                break
-            case "optimism-sepolia":
-                options.address ??= "0x3889927F0B5Eb1a02C6E2C20b39a1Bd4EAd76131"
-                options.startBlock ??= 7632846
-                break
-            default:
-                if (options.address === undefined) {
-                    throw new Error(`You should provide a Semaphore contract address for this network`)
-                }
+        if (supportedNetworks.includes(networkOrEthereumURL as SupportedNetwork)) {
+            const { address, startBlock } = getDeployedContract(networkOrEthereumURL as SupportedNetwork)
+
+            options.address ??= address
+            options.startBlock ??= startBlock
+        } else {
+            if (options.address === undefined) {
+                throw new Error(`You should provide a Semaphore contract address for this network`)
+            }
 
-                options.startBlock ??= 0
+            options.startBlock ??= 0
         }
 
         let provider: Provider
diff --git a/packages/data/src/getURL.ts b/packages/data/src/getURL.ts
index 3ed218cad..23d2ec5e7 100644
--- a/packages/data/src/getURL.ts
+++ b/packages/data/src/getURL.ts
@@ -1,4 +1,4 @@
-import { SupportedNetwork } from "./types"
+import type { SupportedNetwork } from "@semaphore-protocol/utils"
 
 /**
  * Returns the subgraph URL related to the network passed as a parameter.
diff --git a/packages/data/src/subgraph.ts b/packages/data/src/subgraph.ts
index 1480501b1..557fde198 100644
--- a/packages/data/src/subgraph.ts
+++ b/packages/data/src/subgraph.ts
@@ -1,8 +1,10 @@
+import type { SupportedNetwork } from "@semaphore-protocol/utils"
+import { defaultNetwork } from "@semaphore-protocol/utils/networks"
 import { AxiosRequestConfig } from "axios"
 import checkParameter from "./checkParameter"
 import getURL from "./getURL"
 import request from "./request"
-import { GroupOptions, GroupResponse, SupportedNetwork } from "./types"
+import { GroupOptions, GroupResponse } from "./types"
 import { jsDateToGraphqlDate } from "./utils"
 
 export default class SemaphoreSubgraph {
@@ -12,7 +14,7 @@ export default class SemaphoreSubgraph {
      * Initializes the subgraph object with one of the supported networks or a custom URL.
      * @param networkOrSubgraphURL Supported Semaphore network or custom Subgraph URL.
      */
-    constructor(networkOrSubgraphURL: SupportedNetwork | string = SupportedNetwork.SEPOLIA) {
+    constructor(networkOrSubgraphURL: SupportedNetwork | string = defaultNetwork) {
         checkParameter(networkOrSubgraphURL, "networkOrSubgraphURL", "string")
 
         if (typeof networkOrSubgraphURL === "string" && networkOrSubgraphURL.startsWith("http")) {
diff --git a/packages/data/src/types/index.ts b/packages/data/src/types/index.ts
index 019c252bc..3b8ce08ce 100644
--- a/packages/data/src/types/index.ts
+++ b/packages/data/src/types/index.ts
@@ -1,11 +1,3 @@
-export enum SupportedNetwork {
-    SEPOLIA = "sepolia",
-    MUMBAI = "mumbai",
-    OPTIMISM_SEPOLIA = "optimism-sepolia",
-    ARBITRUM_SEPOLIA = "arbitrum-sepolia",
-    ARBITRUM = "arbitrum"
-}
-
 export type EthersNetwork =
     | "homestead"
     | "matic"
diff --git a/packages/utils/package.json b/packages/utils/package.json
index 7f528b2e9..692deaf99 100644
--- a/packages/utils/package.json
+++ b/packages/utils/package.json
@@ -12,10 +12,10 @@
             "require": "./dist/index.cjs",
             "default": "./dist/index.js"
         },
-        "./supported-networks": {
-            "types": "./dist/types/supported-networks.d.ts",
-            "require": "./dist/lib.commonjs/supported-networks.cjs",
-            "default": "./dist/lib.esm/supported-networks.js"
+        "./networks": {
+            "types": "./dist/types/networks.d.ts",
+            "require": "./dist/lib.commonjs/networks.cjs",
+            "default": "./dist/lib.esm/networks.js"
         },
         "./constants": {
             "types": "./dist/types/constants.d.ts",
@@ -47,6 +47,7 @@
         "access": "public"
     },
     "devDependencies": {
+        "@rollup/plugin-json": "^6.1.0",
         "@rollup/plugin-typescript": "^11.1.6",
         "rimraf": "^5.0.5",
         "rollup": "^4.12.0",
diff --git a/packages/utils/rollup.config.ts b/packages/utils/rollup.config.ts
index 648363611..ed43a444c 100644
--- a/packages/utils/rollup.config.ts
+++ b/packages/utils/rollup.config.ts
@@ -1,4 +1,5 @@
 import typescript from "@rollup/plugin-typescript"
+import json from "@rollup/plugin-json"
 import * as fs from "fs"
 import cleanup from "rollup-plugin-cleanup"
 
@@ -23,7 +24,8 @@ export default [
             typescript({
                 tsconfig: "./build.tsconfig.json"
             }),
-            cleanup({ comments: "jsdoc" })
+            cleanup({ comments: "jsdoc" }),
+            json()
         ]
     },
     {
@@ -44,7 +46,8 @@ export default [
                 declaration: false,
                 declarationDir: undefined
             }),
-            cleanup({ comments: "jsdoc" })
+            cleanup({ comments: "jsdoc" }),
+            json()
         ]
     }
 ]
diff --git a/packages/utils/src/index.ts b/packages/utils/src/index.ts
index 64632e2f6..2d338de67 100644
--- a/packages/utils/src/index.ts
+++ b/packages/utils/src/index.ts
@@ -1,6 +1,6 @@
 import * as constants from "./constants"
 import decodeMessage from "./decode-message"
-import supportedNetworks from "./supported-networks"
 
+export * from "./networks"
 export * from "./types"
-export { constants, decodeMessage, supportedNetworks }
+export { constants, decodeMessage }
diff --git a/packages/utils/src/networks.ts b/packages/utils/src/networks.ts
new file mode 100644
index 000000000..80636a6ad
--- /dev/null
+++ b/packages/utils/src/networks.ts
@@ -0,0 +1,25 @@
+// eslint-disable-next-line import/no-relative-packages
+import deployedContracts from "../../contracts/deployed-contracts.json"
+import { SupportedNetwork } from "./types"
+
+// List of Semaphore supported networks.
+const supportedNetworks: SupportedNetwork[] = ["sepolia", "mumbai", "optimism-sepolia", "arbitrum-sepolia", "arbitrum"]
+
+// Default Semaphore network.
+const defaultNetwork: SupportedNetwork = "sepolia"
+
+export function getDeployedContract(supportedNetwork: SupportedNetwork) {
+    const deployedContract = deployedContracts.find(({ network }) => network === supportedNetwork)
+
+    if (!deployedContract) {
+        throw new Error(`Semaphore has not been deployed on '${supportedNetwork}' yet`)
+    }
+
+    return deployedContract.contracts.find(({ name }) => name === "Semaphore") as {
+        name: string
+        address: string
+        startBlock: number
+    }
+}
+
+export { defaultNetwork, deployedContracts, supportedNetworks }
diff --git a/packages/utils/src/supported-networks.ts b/packages/utils/src/supported-networks.ts
deleted file mode 100644
index 3e487d98b..000000000
--- a/packages/utils/src/supported-networks.ts
+++ /dev/null
@@ -1,6 +0,0 @@
-import { SupportedNetwork } from "./types"
-
-// List of Semaphore supported networks.
-const supportedNetwork: SupportedNetwork[] = ["sepolia", "mumbai", "optimism-sepolia", "arbitrum-sepolia", "arbitrum"]
-
-export default supportedNetwork
diff --git a/packages/utils/tests/index.test.ts b/packages/utils/tests/index.test.ts
index 2a5c29071..580545831 100644
--- a/packages/utils/tests/index.test.ts
+++ b/packages/utils/tests/index.test.ts
@@ -1,7 +1,7 @@
 import { encodeBytes32String } from "ethers/abi"
 import { toBigInt } from "ethers/utils"
-import { supportedNetworks } from "../src"
 import decodeMessage from "../src/decode-message"
+import { getDeployedContract, supportedNetworks } from "../src/networks"
 
 describe("Utils", () => {
     describe("# supportedNetworks", () => {
@@ -11,6 +11,15 @@ describe("Utils", () => {
         })
     })
 
+    describe("# getDeployedContract", () => {
+        it("Should return Semaphore deployment data for Sepolia", () => {
+            const { address, startBlock } = getDeployedContract("sepolia")
+
+            expect(address).toHaveLength(42)
+            expect(typeof startBlock).toBe("number")
+        })
+    })
+
     describe("# decodeMessage", () => {
         it("Should decode a text message previously encoded to 32-byte bigint", () => {
             const message = "Hello World"
diff --git a/yarn.lock b/yarn.lock
index 0b544179e..651dc3d4b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6597,6 +6597,7 @@ __metadata:
   dependencies:
     "@rollup/plugin-json": "npm:^6.1.0"
     "@rollup/plugin-typescript": "npm:^11.1.6"
+    "@semaphore-protocol/utils": "npm:4.0.0-beta.4"
     axios: "npm:1.6.6"
     ethers: "npm:6.11.0"
     rimraf: "npm:^5.0.5"
@@ -6696,6 +6697,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@semaphore-protocol/utils@workspace:packages/utils"
   dependencies:
+    "@rollup/plugin-json": "npm:^6.1.0"
     "@rollup/plugin-typescript": "npm:^11.1.6"
     ethers: "npm:^6.11.1"
     rimraf: "npm:^5.0.5"
@@ -25006,6 +25008,7 @@ __metadata:
     "@nomicfoundation/hardhat-verify": "npm:^2.0.0"
     "@openzeppelin/hardhat-upgrades": "npm:^3.0.4"
     "@semaphore-protocol/core": "workspace:packages/core"
+    "@semaphore-protocol/utils": "workspace:packages/utils"
     "@typechain/ethers-v6": "npm:^0.5.0"
     "@typechain/hardhat": "npm:^9.0.0"
     "@types/chai": "npm:^4.2.0"
@@ -25035,6 +25038,7 @@ __metadata:
     "@docusaurus/preset-classic": "npm:3.1.1"
     "@docusaurus/tsconfig": "npm:3.1.1"
     "@mdx-js/react": "npm:^3.0.0"
+    "@semaphore-protocol/utils": "npm:4.0.0-beta.4"
     "@svgr/webpack": "npm:^5.5.0"
     "@types/react": "npm:^18.2.29"
     clsx: "npm:^1.2.1"