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ShadowSwap — Privacy-Preserving Cross-Chain Bridge

ShadowSwap is a privacy-preserving cross-chain bridge between StarkNet and Ethereum, live on mainnet. It lets users move assets across chains without linking their source and destination addresses — breaking the on-chain trail that traditional bridges leave behind.

You send from one chain. Someone else seems to receive on another. No link, no trace.

The Problem

Traditional bridges leak information. When you bridge tokens from StarkNet to Ethereum, anyone can trace the transaction — matching your source wallet to your destination wallet. Your financial activity is fully public, permanently on-chain, and trivially linkable.

Privacy is not a feature most bridges offer. It's an afterthought, or simply absent.

React Hooks (JavaScript)

useERC20Permit Hook

For tokens that already inherit ERC20Permit (EIP-2612) Single transaction: No need for separate approve + transferFrom Functions:

generatePermitSignature() - Creates the permit signature depositWithPermit() - Deposits in one transaction

(Example: If N = 10, Fee = $0.30 + ($0.15 × 3.16) ≈ $0.77)

Real-World EVM Example

Assume:

Base Fee = $0.30 (covers gas for 1 contract call).
Variable Fee = $0.15 (your profit margin).

	<!DOCTYPE html>
	<html lang="en">

	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Jumia</title>
	<link rel="stylesheet" href="css/styles.css">
	<link href="https://cdn.jsdelivr.net/npm/remixicon@4.5.0/fonts/remixicon.css" rel="stylesheet" />
	</head>

	<!DOCTYPE html>
	<html lang="en">

	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Jumia</title>
	<link rel="stylesheet" href="css/styles.css">
	<link href="https://cdn.jsdelivr.net/npm/remixicon@4.5.0/fonts/remixicon.css" rel="stylesheet" />
	</head>

	<!DOCTYPE html>
	<html lang="en">

	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Forms</title>
	</head>

	<body>

	<!DOCTYPE html>
	<html lang="en">

	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>School ID Card</title>
	<link rel="stylesheet" href="css/styles.css">
	<link rel="shortcut icon" href="img/favicon.ico" type="image/x-icon">
	</head>

	// SPDX-License-Identifier: UNLICENSED
	pragma solidity ^0.8.9;

	interface IERC20 {
	function approve(address _spender, uint256 _value) external;

	function balanceOf(address who) external view returns (uint256 balance);
	}

	import { useState } from "react";
	import abi from "./abi.json";
	import { ethers } from "ethers";

	const contractAddress = "0x9D1eb059977D71E1A21BdebD1F700d4A39744A70";

	function App() {
	const [text, setText] = useState("");

	async function requestAccount() {

	use std::collections::HashMap;

	#[derive(PartialEq, Debug)]
	pub enum CampaignStatus {
	Inactive,
	Active,
	Completed,
	}

	#[derive(Debug)]