From f3a3d88c7d5a86ae1fa06cf23932631eaa050151 Mon Sep 17 00:00:00 2001
From: Adam Soltys <adam@coinos.io>
Date: Thu, 22 Oct 2026 08:42:47 -0700
Subject: Links to coinos unfurl with a share card: site-wide Open
 Graph/Twitter tags and a 1200×630 og-image.png. Note and profile pages swap
 the site's tags for their own and fall back to the card when they have no
 picture. README links coinosv3-server on gittr.
MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 build.js | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

(limited to 'build.js')

diff --git a/build.js b/build.js
index 5a279c4..eb81f80 100644
--- a/build.js
+++ b/build.js
@@ -14,7 +14,7 @@ import { mkdir, readdir } from 'node:fs/promises';
 const FAVICON = 'data:image/svg+xml,%3Csvg%20width%3D%2272%22%20height%3D%2272%22%20viewBox%3D%220%200%2072%2072%22%20fill%3D%22none%22%20xmlns%3D%22http%3A//www.w3.org/2000/svg%22%3E%20%3Cpath%20d%3D%22M69.8824%2036C69.8824%2054.7127%2054.7127%2069.8824%2036%2069.8824C17.2873%2069.8824%202.11765%2054.7127%202.11765%2036C2.11765%2017.2873%2017.2873%202.11765%2036%202.11765C54.7127%202.11765%2069.8824%2017.2873%2069.8824%2036Z%22%20fill%3D%22white%22/%3E%20%3Cpath%20fill-rule%3D%22evenodd%22%20clip-rule%3D%22evenodd%22%20d%3D%22M36%204.23529C18.4568%204.23529%204.23529%2018.4568%204.23529%2036C4.23529%2053.5432%2018.4568%2067.7647%2036%2067.7647C53.5432%2067.7647%2067.7647%2053.5432%2067.7647%2036C67.7647%2018.4568%2053.5432%204.23529%2036%204.23529ZM0%2036C0%2016.1177%2016.1177%200%2036%200C55.8823%200%2072%2016.1177%2072%2036C72%2055.8823%2055.8823%2072%2036%2072C16.1177%2072%200%2055.8823%200%2036Z%22%20fill%3D%22black%22/%3E%20%3Cpath%20fill-rule%3D%22evenodd%22%20clip-rule%3D%22evenodd%22%20d%3D%22M36%2058.5882C48.4751%2058.5882%2058.5882%2048.4751%2058.5882%2036C58.5882%2023.5248%2048.4751%2013.4117%2036%2013.4117C23.5249%2013.4117%2013.4118%2023.5248%2013.4118%2036C13.4118%2048.4751%2023.5249%2058.5882%2036%2058.5882ZM36%2054C45.9411%2054%2054%2045.9411%2054%2036C54%2026.0589%2045.9411%2018%2036%2018C26.0589%2018%2018%2026.0589%2018%2036C18%2045.9411%2026.0589%2054%2036%2054Z%22%20fill%3D%22black%22/%3E%20%3Cpath%20fill-rule%3D%22evenodd%22%20clip-rule%3D%22evenodd%22%20d%3D%22M36.0001%2022.8988C36.0001%2022.8988%2036%2022.8988%2036%2022.8988C28.7644%2022.8988%2022.8988%2028.7644%2022.8988%2036C22.8988%2043.2356%2028.7644%2049.1012%2036%2049.1012C36%2049.1012%2036.0001%2049.1012%2036.0001%2049.1012V22.8988Z%22%20fill%3D%22black%22/%3E%20%3C/svg%3E';
 
 // Static assets copied verbatim into dist/ (icons referenced by the manifest).
-const STATIC = ['icon-192.png', 'icon-512.png', 'icon-maskable-512.png', 'icon.svg', 'badge-96.png', 'PublicSans.woff2', 'PublicSans-Italic.woff2', 'PublicSans-OFL.txt'];
+const STATIC = ['icon-192.png', 'icon-512.png', 'icon-maskable-512.png', 'icon.svg', 'badge-96.png', 'og-image.png', 'PublicSans.woff2', 'PublicSans-Italic.woff2', 'PublicSans-OFL.txt'];
 
 const MANIFEST = {
   id: '/',
@@ -394,6 +394,26 @@ const BOOT_SHELL_SCRIPT = `<script>try{var m=location.pathname.match(/^\\/([A-Za
 // fetch the live site over the top of them.
 const NO_SW = !!env('NO_SW');
 
+// What a link to the site unfurls as (chat apps, social posts, search). The
+// server-rendered note and profile pages swap this block for their own
+// (feed/note-page.js siteTagsOut), so the markers must stay.
+const SHARE_IMAGE = 'https://v3.coinos.io/og-image.png';
+const SHARE_DESC = 'Self-custody Bitcoin wallet in your browser: Lightning, Ark and Nostr, with your own keys.';
+const siteTags = (staging) => `<!--site-tags-->
+<meta name="description" content="${SHARE_DESC}">
+<meta property="og:type" content="website">
+<meta property="og:site_name" content="Coinos">
+<meta property="og:title" content="${staging ? 'Coinos Staging' : 'Coinos'}">
+<meta property="og:description" content="${SHARE_DESC}">
+<meta property="og:image" content="${SHARE_IMAGE}">
+<meta property="og:image:width" content="1200">
+<meta property="og:image:height" content="630">
+<meta property="og:image:alt" content="The coinos logo">
+<meta name="twitter:card" content="summary_large_image">
+<meta name="twitter:image" content="${SHARE_IMAGE}">
+<!--/site-tags-->
+`;
+
 async function pageHtml({ css, staging, pwa, scriptHtml }) {
   // On https the page asks for its http:// pictures and clips (and ws://
   // relays) over https: a post's one http:// clip made Chrome call the whole
@@ -408,7 +428,7 @@ async function pageHtml({ css, staging, pwa, scriptHtml }) {
 <meta name="color-scheme" content="light dark">
 <title>${staging ? 'Coinos Staging' : 'Coinos'}</title>
 <link rel="icon" href="${FAVICON}">
-${pwa ? PWA_HEAD : ''}<script>try{var t=localStorage.getItem('btc-wallet-theme');if(t!=='dark'&&t!=='light')t=matchMedia('(prefers-color-scheme:dark)').matches?'dark':'light';document.documentElement.dataset.theme=t;var m=document.querySelector('meta[name="theme-color"]');if(m)m.setAttribute('content',t==='dark'?'#15171a':'#eef0f3');}catch(e){}</script>
+${siteTags(staging)}${pwa ? PWA_HEAD : ''}<script>try{var t=localStorage.getItem('btc-wallet-theme');if(t!=='dark'&&t!=='light')t=matchMedia('(prefers-color-scheme:dark)').matches?'dark':'light';document.documentElement.dataset.theme=t;var m=document.querySelector('meta[name="theme-color"]');if(m)m.setAttribute('content',t==='dark'?'#15171a':'#eef0f3');}catch(e){}</script>
 <style>${css}</style>
 </head>
 <body>
-- 
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