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<!doctype html><html lang=en dir=ltr class="docs-wrapper plugin-docs plugin-id-default docs-version-current docs-doc-page docs-doc-id-lez/programs/write-and-deploy-lez-program-with-scaffold" data-has-hydrated=false><head><meta charset=UTF-8><meta name=generator content="Docusaurus v3.10.2"><title data-rh=true>Write and deploy an LEZ program with `logos-scaffold` | Logos documentation</title><meta data-rh=true name=viewport content="width=device-width, initial-scale=1.0"/><meta data-rh=true name=twitter:card content=summary_large_image /><meta data-rh=true property=og:image content=https://docs.logos.co/img/social-card-v2.jpg /><meta data-rh=true name=twitter:image content=https://docs.logos.co/img/social-card-v2.jpg /><meta data-rh=true property=og:url content=https://docs.logos.co/lez/programs/write-and-deploy-lez-program-with-scaffold /><meta data-rh=true property=og:locale content=en /><meta data-rh=true name=docusaurus_locale content=en /><meta data-rh=true name=docsearch:language content=en /><meta data-rh=true name=docusaurus_version content=current /><meta data-rh=true name=docusaurus_tag content=docs-default-current /><meta data-rh=true name=docsearch:version content=current /><meta data-rh=true name=docsearch:docusaurus_tag content=docs-default-current /><meta data-rh=true property=og:title content="Write and deploy an LEZ program with `logos-scaffold` | Logos documentation"/><meta data-rh=true name=description content="Use logos-scaffold to create, build, and deploy a guest program on the Logos Execution Zone testnet."/><meta data-rh=true property=og:description content="Use logos-scaffold to create, build, and deploy a guest program on the Logos Execution Zone testnet."/><link data-rh=true rel=icon href=/img/favicon.png /><link data-rh=true rel=canonical href=https://docs.logos.co/lez/programs/write-and-deploy-lez-program-with-scaffold /><link data-rh=true rel=alternate href=https://docs.logos.co/lez/programs/write-and-deploy-lez-program-with-scaffold hreflang=en /><link data-rh=true rel=alternate href=https://docs.logos.co/lez/programs/write-and-deploy-lez-program-with-scaffold hreflang=x-default /><script data-rh=true type=application/ld+json>{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","item":"https://docs.logos.co/lez/programs/write-and-deploy-lez-program-with-scaffold","name":"Write and deploy an LEZ program with `logos-scaffold`","position":1}]}</script><link rel=icon href=/img/favicon.png media="(prefers-color-scheme: light)"><link rel=icon href=/img/favicon-dark.png media="(prefers-color-scheme: dark)"><script src=https://umami.bi.status.im/script.js defer data-website-id=0f95ea33-c693-4fe7-91dc-8effe9645fa8></script><link rel=stylesheet href=/assets/css/styles.3f5955aa.css /><script src=/assets/js/runtime~main.37d92aa5.js defer></script><script src=/assets/js/main.538234c2.js defer></script></head><body><svg style="display: none;"><defs>
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`logos-scaffold`</span></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type=button class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Write and deploy an LEZ program with <code>logos-scaffold</code></h1></header>
<h4 class="anchor anchorTargetStickyNavbar_Vzrq" id=use-logos-scaffold-to-create-build-and-deploy-a-guest-program-on-the-logos-execution-zone-testnet>Use <code>logos-scaffold</code> to create, build, and deploy a guest program on the Logos Execution Zone testnet.<a href=#use-logos-scaffold-to-create-build-and-deploy-a-guest-program-on-the-logos-execution-zone-testnet class=hash-link aria-label="Direct link to use-logos-scaffold-to-create-build-and-deploy-a-guest-program-on-the-logos-execution-zone-testnet" title="Direct link to use-logos-scaffold-to-create-build-and-deploy-a-guest-program-on-the-logos-execution-zone-testnet" translate=no>​</a></h4>
<div class="theme-admonition theme-admonition-tip admonition_xJq3 alert alert--success"><div class=admonitionHeading_Gvgb><span class=admonitionIcon_Rf37><svg viewBox="0 0 12 16"><path fill-rule=evenodd d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"/></svg></span>Version</div><div class=admonitionContent_BuS1><p>This document is accurate for <strong>Testnet v0.2.1</strong>.</div></div>
<p><a href=https://github.com/logos-co/scaffold target=_blank rel="noopener noreferrer" class=""><code>logos-scaffold</code></a> is a project scaffold and CLI tool that manages the full lifecycle of a <a class="" href=/get-started/glossary#lez>LEZ</a> guest <a class="" href=/get-started/glossary#program>program</a>—from project creation to deployment. It pins LEZ and SPEL dependencies, builds a project-local sequencer, and handles wallet interactions, so you can focus on writing your program logic.</p>
<div class="theme-admonition theme-admonition-info admonition_xJq3 alert alert--info"><div class=admonitionHeading_Gvgb><span class=admonitionIcon_Rf37><svg viewBox="0 0 14 16"><path fill-rule=evenodd d="M7 2.3c3.14 0 5.7 2.56 5.7 5.7s-2.56 5.7-5.7 5.7A5.71 5.71 0 0 1 1.3 8c0-3.14 2.56-5.7 5.7-5.7zM7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm1 3H6v5h2V4zm0 6H6v2h2v-2z"/></svg></span>Prerequisites</div><div class=admonitionContent_BuS1><ul>
<li class="">
<p>A supported OS:</p>
<ul>
<li class="">Linux: x86_64</li>
<li class="">macOS</li>
</ul>
</li>
<li class="">
<p>An <a class="" href=/lez/get-started/run-lez-wallet-via-cli>LEZ CLI wallet</a> set up and funded.</p>
</li>
<li class="">
<p><a href=https://docs.docker.com/get-docker/ target=_blank rel="noopener noreferrer" class="">Docker</a> or Podman installed.</p>
</li>
<li class="">
<p>The <a href=https://dev.risczero.com/api/zkvm/install target=_blank rel="noopener noreferrer" class="">RISC Zero toolchain</a>.</p>
<ul>
<li class="">To install, run <code>rzup install rust</code></li>
</ul>
</li>
<li class="">
<p><strong>Nix</strong> with flakes enabled.</p>
<ul>
<li class="">Install from <a href=https://nixos.org/download.html target=_blank rel="noopener noreferrer" class="">nixos.org</a>, then enable flakes:</li>
</ul>
<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token function" style=color:#d73a49>mkdir</span><span class="token plain"> </span><span class="token parameter variable" style=color:#36acaa>-p</span><span class="token plain"> ~/.config/nix</span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token builtin class-name">echo</span><span class="token plain"> </span><span class="token string" style=color:#e3116c>'experimental-features = nix-command flakes'</span><span class="token plain"> </span><span class="token operator" style=color:#393A34>>></span><span class="token plain"> ~/.config/nix/nix.conf</span><br/></div></code></pre></div></div>
</li>
</ul></div></div>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=what-to-expect>What to expect<a href=#what-to-expect class=hash-link aria-label="Direct link to What to expect" title="Direct link to What to expect" translate=no>​</a></h2>
<ul>
<li class="">You can create a new LEZ program project with logos-scaffold.</li>
<li class="">You can write a guest program that runs inside the RISC0 zkVM.</li>
<li class="">You can build and deploy your program to the LEZ testnet.</li>
<li class="">You can interact with your deployed program using the wallet CLI.</li>
</ul>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=step-1-install-logos-scaffold>Step 1: Install logos-scaffold<a href=#step-1-install-logos-scaffold class=hash-link aria-label="Direct link to Step 1: Install logos-scaffold" title="Direct link to Step 1: Install logos-scaffold" translate=no>​</a></h2>
<ol>
<li class="">
<p>Clone the logos-scaffold repository and install the CLI:</p>
<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token function" style=color:#d73a49>git</span><span class="token plain"> clone https://github.com/logos-co/scaffold.git</span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token builtin class-name">cd</span><span class="token plain"> scaffold</span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token function" style=color:#d73a49>cargo</span><span class="token plain"> </span><span class="token function" style=color:#d73a49>install</span><span class="token plain"> </span><span class="token parameter variable" style=color:#36acaa>--path</span><span class="token plain"> </span><span class="token builtin class-name">.</span><br/></div></code></pre></div></div>
<p>This installs two binaries on your PATH: <code>logos-scaffold</code> and the shorter alias <code>lgs</code>. They are functionally identical.</p>
</li>
<li class="">
<p>Verify the installation:</p>
<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token plain">logos-scaffold </span><span class="token parameter variable" style=color:#36acaa>--version</span><br/></div></code></pre></div></div>
</li>
</ol>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=step-2-create-a-new-project>Step 2: Create a new project<a href=#step-2-create-a-new-project class=hash-link aria-label="Direct link to Step 2: Create a new project" title="Direct link to Step 2: Create a new project" translate=no>​</a></h2>
<ol>
<li class="">
<p>Create a new LEZ program project. Replace <code>my-program</code> with your project name:</p>
<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token plain">logos-scaffold new my-program</span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token builtin class-name">cd</span><span class="token plain"> my-program</span><br/></div></code></pre></div></div>
<p>This generates a project with the default template, which includes a sample guest program and runner scripts.</p>
</li>
<li class="">
<p>Inspect the project layout:</p>
<div class="language-text codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-text codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token plain">my-program/</span><br/></div><div class=token-line style=color:#393A34><span class="token plain">├── scaffold.toml # Project configuration and dependency pins</span><br/></div><div class=token-line style=color:#393A34><span class="token plain">├── methods/</span><br/></div><div class=token-line style=color:#393A34><span class="token plain">│ └── guest/</span><br/></div><div class=token-line style=color:#393A34><span class="token plain">│ └── src/bin/ # Guest programs run inside the RISC0 zkVM</span><br/></div><div class=token-line style=color:#393A34><span class="token plain">├── src/</span><br/></div><div class=token-line style=color:#393A34><span class="token plain">│ └── bin/ # Runner scripts that submit transactions</span><br/></div><div class=token-line style=color:#393A34><span class="token plain">└── .scaffold/ # Local state, wallet home, and build artifacts</span><br/></div></code></pre></div></div>
</li>
</ol>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=step-3-set-up-the-project>Step 3: Set up the project<a href=#step-3-set-up-the-project class=hash-link aria-label="Direct link to Step 3: Set up the project" title="Direct link to Step 3: Set up the project" translate=no>​</a></h2>
<ol>
<li class="">
<p>Run <code>setup</code> to sync the LEZ and SPEL repositories to their pinned commits, build the project-local sequencer and wallet binaries, and seed the default wallet:</p>
<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token plain">logos-scaffold setup</span><br/></div></code></pre></div></div>
<p>This step can take several minutes on a cold cache as it builds the sequencer from source.</p>
</li>
</ol>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=step-4-write-your-guest-program>Step 4: Write your guest program<a href=#step-4-write-your-guest-program class=hash-link aria-label="Direct link to Step 4: Write your guest program" title="Direct link to Step 4: Write your guest program" translate=no>​</a></h2>
<p>Guest programs run inside the <a href=https://dev.risczero.com/ target=_blank rel="noopener noreferrer" class="">RISC0 zkVM</a> and define the on-chain logic of your LEZ program. Each guest program in <code>methods/guest/src/bin/</code> becomes a deployable program with its own <code>program_id</code>.</p>
<ol>
<li class="">
<p>Open the sample guest program:</p>
<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token variable" style=color:#36acaa>$EDITOR</span><span class="token plain"> methods/guest/src/bin/hello_world.rs</span><br/></div></code></pre></div></div>
</li>
<li class="">
<p>The program receives a <code>ProgramInput</code> struct via the zkVM environment, applies your logic, and writes a <code>ProgramOutput</code> struct to the journal. The sequencer verifies the proof and updates the on-chain <a class="" href=/get-started/glossary#account>account</a> state.</p>
<p>Key concepts:</p>
<ul>
<li class=""><strong>Instructions</strong> are encoded as <code>Vec&lt;u8></code> (opcode byte followed by payload).</li>
<li class=""><strong>Account data</strong> is stored in <code>AccountWithMetadata</code> structs.</li>
<li class="">Use <code>RISC0_DEV_MODE=1</code> during development to skip ZK proof generation for faster iteration.</li>
</ul>
</li>
</ol>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=step-5-build-the-project>Step 5: Build the project<a href=#step-5-build-the-project class=hash-link aria-label="Direct link to Step 5: Build the project" title="Direct link to Step 5: Build the project" translate=no>​</a></h2>
<ol>
<li class="">
<p>Build the workspace. In development, use <code>RISC0_DEV_MODE=1</code> to skip proof generation:</p>
<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token assign-left variable" style=color:#36acaa>RISC0_DEV_MODE</span><span class="token operator" style=color:#393A34>=</span><span class="token number" style=color:#36acaa>1</span><span class="token plain"> logos-scaffold build</span><br/></div></code></pre></div></div>
<p>The build compiles your guest programs and produces <code>.bin</code> artifacts under <code>target/riscv-guest/…/riscv32im-risc0-zkvm-elf/release/</code>.</p>
</li>
</ol>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=step-6-start-a-local-sequencer>Step 6: Start a local sequencer<a href=#step-6-start-a-local-sequencer class=hash-link aria-label="Direct link to Step 6: Start a local sequencer" title="Direct link to Step 6: Start a local sequencer" translate=no>​</a></h2>
<ol>
<li class="">
<p>Start a project-local sequencer to test your program before deploying to the testnet:</p>
<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token assign-left variable" style=color:#36acaa>RISC0_DEV_MODE</span><span class="token operator" style=color:#393A34>=</span><span class="token number" style=color:#36acaa>1</span><span class="token plain"> logos-scaffold localnet start</span><br/></div></code></pre></div></div>
<p>The sequencer is daemonised and survives terminal or tmux session closure. Use <code>logos-scaffold localnet status</code> to check that it is running and <code>logos-scaffold localnet stop</code> to stop it.</p>
</li>
</ol>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=step-7-deploy-your-program>Step 7: Deploy your program<a href=#step-7-deploy-your-program class=hash-link aria-label="Direct link to Step 7: Deploy your program" title="Direct link to Step 7: Deploy your program" translate=no>​</a></h2>
<ol>
<li class="">
<p>Deploy all guest programs to the running sequencer:</p>
<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token assign-left variable" style=color:#36acaa>RISC0_DEV_MODE</span><span class="token operator" style=color:#393A34>=</span><span class="token number" style=color:#36acaa>1</span><span class="token plain"> logos-scaffold deploy</span><br/></div></code></pre></div></div>
<p>After a successful deployment, <code>logos-scaffold</code> prints a per-program summary; when the vendored <code>spel</code> tooling is available it also prints a <code>program_id</code>—a hex-encoded RISC0 image ID computed from the submitted ELF. The example runner scripts in Step 8 load the program from its embedded ELF, so you do not need to copy a <code>program_id</code> to complete this guide.</p>
</li>
<li class="">
<p>To deploy a specific program by name:</p>
<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token assign-left variable" style=color:#36acaa>RISC0_DEV_MODE</span><span class="token operator" style=color:#393A34>=</span><span class="token number" style=color:#36acaa>1</span><span class="token plain"> logos-scaffold deploy hello_world</span><br/></div></code></pre></div></div>
</li>
</ol>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=step-8-interact-with-your-program>Step 8: Interact with your program<a href=#step-8-interact-with-your-program class=hash-link aria-label="Direct link to Step 8: Interact with your program" title="Direct link to Step 8: Interact with your program" translate=no>​</a></h2>
<p>Use the project-local wallet CLI to submit transactions to your deployed program. The wallet is available at <code>logos-scaffold wallet</code>.</p>
<ol>
<li class="">
<p>With the sequencer from Step 6 running, top up the default wallet from the faucet, then list your accounts (<code>wallet list</code> shows accounts, not a balance):</p>
<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token plain">logos-scaffold wallet topup</span><br/></div><div class=token-line style=color:#393A34><span class="token plain">logos-scaffold wallet list</span><br/></div></code></pre></div></div>
</li>
<li class="">
<p>Run one of the example runner scripts that submit transactions to your program:</p>
<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token builtin class-name">export</span><span class="token plain"> </span><span class="token assign-left variable" style=color:#36acaa>NSSA_WALLET_HOME_DIR</span><span class="token operator" style=color:#393A34>=</span><span class="token string" style=color:#e3116c>"</span><span class="token string variable" style=color:#36acaa>$(</span><span class="token string variable builtin class-name" style=color:#36acaa>pwd</span><span class="token string variable" style=color:#36acaa>)</span><span class="token string" style=color:#e3116c>/.scaffold/wallet"</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token assign-left variable" style=color:#36acaa>RISC0_DEV_MODE</span><span class="token operator" style=color:#393A34>=</span><span class="token number" style=color:#36acaa>1</span><span class="token plain"> </span><span class="token function" style=color:#d73a49>cargo</span><span class="token plain"> run </span><span class="token parameter variable" style=color:#36acaa>--bin</span><span class="token plain"> run_hello_world -- </span><span class="token operator" style=color:#393A34>&lt;</span><span class="token plain">PUBLIC_ACCOUNT_ID</span><span class="token operator" style=color:#393A34>></span><br/></div></code></pre></div></div>
<p>The runner scripts in <code>src/bin/</code> demonstrate how to construct and sign a <code>PublicTransaction</code>, set the <code>program_id</code>, encode an instruction, and submit the transaction via the sequencer RPC.</p>
</li>
</ol>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id=deploy-to-the-testnet>Deploy to the testnet<a href=#deploy-to-the-testnet class=hash-link aria-label="Direct link to Deploy to the testnet" title="Direct link to Deploy to the testnet" translate=no>​</a></h2>
<p>To deploy to the LEZ public testnet instead of a local sequencer, ensure your wallet has test tokens (use <code>logos-scaffold wallet topup</code> to request from the faucet) and remove the <code>RISC0_DEV_MODE=1</code> prefix from the build and deploy commands. Full ZK proof generation can take significantly longer than dev mode.</p>
<div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockContent_QJqH><pre tabindex=0 class="prism-code language-bash codeBlock_bY9V thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_e6Vv><div class=token-line style=color:#393A34><span class="token plain">logos-scaffold build</span><br/></div><div class=token-line style=color:#393A34><span class="token plain">logos-scaffold deploy</span><br/></div></code></pre></div></div></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="row margin-top--sm theme-doc-footer-edit-meta-row"><div class="col noPrint_WFHX"><a href=https://github.com/logos-co/logos-docs/tree/main/docs/lez/programs/write-and-deploy-lez-program-with-scaffold.md target=_blank rel="noopener noreferrer" class=theme-edit-this-page><svg fill=currentColor height=20 width=20 viewBox="0 0 40 40" class=iconEdit_Z9Sw aria-hidden=true><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"/></g></svg>Edit this page</a></div><div class="col lastUpdated_JAkA"></div></div></footer></article><nav class="docusaurus-mt-lg pagination-nav" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href=/lez/accounts/set-up-shared-private-lez-account><div class=pagination-nav__sublabel>Previous</div><div class=pagination-nav__label>Set up a shared private account</div></a><a class="pagination-nav__link pagination-nav__link--next" href=/lez/programs/trade-tokens-on-lez-amm-program><div class=pagination-nav__sublabel>Next</div><div class=pagination-nav__label>Trade tokens on the LEZ AMM program</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href=#what-to-expect class="table-of-contents__link toc-highlight">What to expect</a><li><a href=#step-1-install-logos-scaffold class="table-of-contents__link toc-highlight">Step 1: Install logos-scaffold</a><li><a href=#step-2-create-a-new-project class="table-of-contents__link toc-highlight">Step 2: Create a new project</a><li><a href=#step-3-set-up-the-project class="table-of-contents__link toc-highlight">Step 3: Set up the project</a><li><a href=#step-4-write-your-guest-program class="table-of-contents__link toc-highlight">Step 4: Write your guest program</a><li><a href=#step-5-build-the-project class="table-of-contents__link toc-highlight">Step 5: Build the project</a><li><a href=#step-6-start-a-local-sequencer class="table-of-contents__link toc-highlight">Step 6: Start a local sequencer</a><li><a href=#step-7-deploy-your-program class="table-of-contents__link toc-highlight">Step 7: Deploy your program</a><li><a href=#step-8-interact-with-your-program class="table-of-contents__link toc-highlight">Step 8: Interact with your program</a><li><a href=#deploy-to-the-testnet class="table-of-contents__link toc-highlight">Deploy to the testnet</a></ul></div></div></div></div></main></div></div></div><footer class="theme-layout-footer footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="theme-layout-footer-column col footer__col"><div class=footer__title>Docs</div><ul class="footer__items clean-list"><li class=footer__item><a class=footer__link-item href=/get-started/what-is-logos>Get started</a></ul></div><div class="theme-layout-footer-column col footer__col"><div class=footer__title>Community</div><ul class="footer__items clean-list"><li class=footer__item><a href=https://github.com/logos-co/logos-docs target=_blank rel="noopener noreferrer" class=footer__link-item>GitHub<svg width=13.5 height=13.5 aria-label="(opens in new tab)" class=iconExternalLink_nPIU><use href=#theme-svg-external-link /></svg></a></ul></div><div class="theme-layout-footer-column col footer__col"><div class=footer__title>Legal</div><ul class="footer__items clean-list"><li class=footer__item><a href=https://logos.co/terms-and-conditions target=_blank rel="noopener noreferrer" class=footer__link-item>Terms and Conditions<svg width=13.5 height=13.5 aria-label="(opens in new tab)" class=iconExternalLink_nPIU><use href=#theme-svg-external-link /></svg></a></ul></div></div><div class="footer__bottom text--center"><div class=footer__copyright>Copyright © 2026 Logos. Built with Docusaurus.</div></div></div></footer></div></body>
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