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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Cashu – BTCforPlebs</title>
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<meta name="description" content="Cashu is a Bitcoin third‑layer Chaumian ecash protocol. This guide covers how it works, its privacy features, and how to get started with app walkthroughs.">
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<meta name="description"
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content="Cashu is a Bitcoin third‑layer Chaumian ecash protocol. This guide covers how it works, its privacy features, and how to get started with app walkthroughs.">
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<link rel="icon" href="/images/favicon.png" type="image/png">
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</head>
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<body>
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<!-- Bitcoin Price Banner -->
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<div id="btc-price-banner">This page is under construction</div>
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<div class="logo-container">
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<a href="/" class="prefetch">
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<img src="/images/btcforplebs_logo.gif" alt="Home" class="header-logo">
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</a>
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</div>
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<div class="container">
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<h1>Cashu – Chaumian Ecash on Bitcoin</h1>
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<p>Cashu is a lightweight, privacy‑preserving ecash system that runs on top of the Lightning Network and settles on‑chain. It uses zero‑knowledge proofs to hide the value of a transfer while remaining fully traceable when required.</p>
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<!-- Dropdown navigation, similar to learn‑bitcoin -->
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<div class="dropdown">
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<select onchange="navigateToSection(this)">
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<option value="">Select a topic</option>
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<option value="what-is-cashu">What is Cashu?</option>
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<option value="privacy">Privacy & Zero‑Knowledge</option>
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<option value="technology">Underlying Technology</option>
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<option value="apps">Apps & Use‑Cases</option>
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<option value="getting-started">Getting Started</option>
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<option value="videos">Video Resources</option>
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</select>
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<div class="logo-container">
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<a href="/" class="prefetch">
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<img src="/images/btcforplebs_logo.gif" alt="Home" class="header-logo">
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</a>
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</div>
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<div class="container">
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<h1>Cashu – Chaumian Ecash on Bitcoin</h1>
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<p>Cashu is a lightweight, privacy‑preserving ecash system that runs on top of the Lightning Network and settles
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on‑chain. It uses zero‑knowledge proofs to hide the value of a transfer while remaining fully traceable when
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required.</p>
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<!-- Sections -->
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<section id="what-is-cashu">
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<h2>What is Cashu?</h2>
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<p>Cashu is an ecash protocol that allows you to mint, transfer, and spend Bitcoin value without revealing the amount or the sender/receiver in public transactions. It leverages the Lightning Network for instant settlement while maintaining on‑chain traceability for regulatory compliance. Think of it as a privacy‑preserving UTXO that can be moved anywhere on the Lightning network.</p>
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</section>
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<section id="privacy">
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<h2>Privacy & Zero‑Knowledge</h2>
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<p>At the core of Cashu is a zero‑knowledge range proof that proves the value of a note without exposing it. This means you can pay for goods or services with a Cashu note and the recipient can verify that the note contains sufficient value, while the transaction remains private on‑chain.</p>
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</section>
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<section id="technology">
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<h2>Underlying Technology</h2>
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<p>Cashu uses a set of “notes” minted by a mint and signed with a unique key. Each note contains an amount and a unique identifier that the mint keeps encrypted. Transfers are executed with the Lightning Network, but minting and redeeming are done via on‑chain transactions that are fully verifiable.</p>
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</section>
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<section id="apps">
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<h2>Apps & Use‑Cases</h2>
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<p>Several wallet applications support Cashu, from the <a href="https://cashu.me" target="_blank" class="prefetch">Cashu Web Wallet</a> to <a href="https://meltwallet.com" target="_blank" class="prefetch">Melt’s Lightning Wallet</a>. Below are quick links to some popular ones:</p>
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<div class="button-container">
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<a href="https://cashu.me" class="button" target="_blank" class="prefetch">Cashu Web Wallet</a>
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<a href="https://meltwallet.com" class="button" target="_blank" class="prefetch">Melt Wallet</a>
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<a href="https://github.com/cashu/cashu-js-demo" class="button" target="_blank" class="prefetch">Cashu JS Demo</a>
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<!-- Dropdown navigation, similar to learn‑bitcoin -->
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<div class="dropdown">
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<select onchange="navigateToSection(this)">
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<option value="">Select a topic</option>
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<option value="what-is-cashu">What is Cashu?</option>
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<option value="privacy">Privacy & Zero‑Knowledge</option>
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<option value="technology">Underlying Technology</option>
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<option value="apps">Cashu Apps</option>
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<option value="getting-started">Getting Started</option>
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</select>
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</div>
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</section>
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<section id="getting-started">
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<h2>Getting Started</h2>
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<p>To begin using Cashu, you’ll need a Lightning‑ready wallet that supports the protocol. Most of the wallets listed above have a <code>Cashu</code> switch or integration. Once installed, create a new Cashu account, mint a few notes, and start experimenting.</p>
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</section>
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<!-- Sections -->
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<section id="what-is-cashu">
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<h2>What is Cashu?</h2>
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<p>Cashu is an ecash protocol that allows you to mint, transfer, and spend sats without revealing
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the amount or the sender/receiver in public transactions. It leverages the Lightning Network for instant
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settlement on nodes. Think of it as a
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privacy‑preserving bearer instrument that can be minted and redeemed across on the Lightning network.
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</p>
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</section>
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<section id="videos">
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<h2>Video Resources</h2>
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<!-- Explainer Video 1 -->
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<h3>Explainer – What is Cashu?</h3>
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<div class="video-container">
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<video controls poster="https://i.imgur.com/Dc6m4zV.png" loading="lazy" style="width:100%">
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<source src="https://raw.githubusercontent.com/cashu/cashu-presentation/master/intro.mp4" type="video/mp4">
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Your browser does not support the video tag.
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</video>
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</div>
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<!-- Walkthrough Video 2 -->
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<h3>How to Mint a Cashu Note</h3>
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<div class="video-container">
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<video controls poster="https://i.imgur.com/Kq4c1rT.png" loading="lazy" style="width:100%">
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<source src="https://raw.githubusercontent.com/cashu/cashu-presentation/master/mint.mp4" type="video/mp4">
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Your browser does not support the video tag.
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</video>
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</div>
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<!-- App Walkthrough 3 -->
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<h3>Using Cashu in Melt Wallet</h3>
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<div class="video-container">
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<video controls poster="https://i.imgur.com/3p6zT9G.png" loading="lazy" style="width:100%">
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<source src="https://raw.githubusercontent.com/cashu/cashu-presentation/master/melt-demo.mp4" type="video/mp4">
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Your browser does not support the video tag.
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</video>
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</div>
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</section>
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<section id="privacy">
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<h2>Privacy & Zero‑Knowledge</h2>
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<p>At the core of Cashu is a zero‑knowledge range proof that proves the value of a note without exposing it.
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This means you can pay for goods or services with a Cashu note and the recipient can verify that the
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note contains sufficient value, while the transaction remains private on‑chain.</p>
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</section>
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<div class="social-icons">
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<a href="https://github.com/cashu" target="_blank" class="prefetch"><i class="fa-brands fa-github"></i></a>
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<a href="https://twitter.com/CashuProtocol" target="_blank" class="prefetch"><i class="fa-brands fa-twitter"></i></a>
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<section id="technology">
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<h2>Underlying Technology</h2>
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<p>Cashu uses a set of “notes” minted by a mint and signed with a unique key. Each note contains an amount
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and a unique identifier that the mint keeps encrypted. Transfers are executed with the Lightning
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Network, and does require a mint to mint notes and therefore requires some level of trust in the mint.
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</p>
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</section>
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<section id="apps">
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<h2>Cashu Apps</h2>
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<p>Several wallet applications support Cashu. Below are quick links to some popular ones:</p>
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<div class="button-container">
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<a href="https://cashu.btcforplebs.com" class="button" target="_blank" class="prefetch">Cashu Wallet Web
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App</a>
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<a href="https://nutstash.btcforplebs.com" class="button" target="_blank" class="prefetch">Nutstash
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Wallet Web App</a>
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<a href="https://macadamia.cash" class="button" target="_blank" class="prefetch">Macadamia (iOS App)</a>
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<a href="https://minibits.cash" class="button" target="_blank" class="prefetch">Minibits (Android & iOS
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App)</a>
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</div>
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</section>
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<section id="getting-started">
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<h2>Getting Started</h2>
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<p>To begin using Cashu, you’ll need a Lightning‑ready wallet that supports the protocol. Most of the
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wallets listed above have a <code>Cashu</code> switch or integration. Once installed, create a new Cashu
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account, mint a few notes, and start experimenting.</p>
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</section>
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<div class="social-icons">
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<a href="https://github.com/cashu" target="_blank" class="prefetch"><i class="fa-brands fa-github"></i></a>
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<a href="https://twitter.com/CashuProtocol" target="_blank" class="prefetch"><i
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class="fa-brands fa-twitter"></i></a>
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</div>
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<div class="last-update">
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<small id="last-updated-text"></small>
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</div>
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<small id="last-updated-text"></small>
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