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diff --git a/src/translate-split.js b/src/translate-split.js
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+++ b/src/translate-split.js
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+// What must come back from a translation exactly as it went in: links,
+// nostr: mentions, custom emoji shortcodes, hashtags, @handles, invoices and
+// other long codes. Translation models mangle them ("https: / / example.com
+// / fot.jpg"), so only the prose between them is translated and the text is
+// put back together around the untouched tokens. Shared by the registrar
+// (names/translate.js) and the browser's own translator (messages.js).
+const KEEP = /(https?:\/\/\S+|nostr:[a-z0-9]+|:[a-z0-9_+-]{1,40}:|#[\p{L}\p{N}_]+|@[\w.-]+(?:@[\w.-]+)?|\b(?:ln|lightning:|cashu|bitcoin:|nevent|npub|nprofile|note|naddr)[a-z0-9]{20,}|\S{40,})/giu;
+
+export function splitProse(text) {
+  const parts = [];
+  let last = 0;
+  for (const m of String(text || '').matchAll(KEEP)) {
+    if (m.index > last) parts.push({ prose: text.slice(last, m.index) });
+    parts.push({ keep: m[0] });
+    last = m.index + m[0].length;
+  }
+  if (last < text.length) parts.push({ prose: text.slice(last) });
+  return parts;
+}
+// a piece worth translating: has words, not just spaces and punctuation
+export const hasWords = (s) => /\p{L}{2,}/u.test(s || '');
+
+// Translate the prose pieces (one call for all of them) and reassemble.
+// Each piece keeps its own leading/trailing whitespace — line breaks matter.
+export async function translatePieces(text, translateMany) {
+  const parts = splitProse(text);
+  const prose = parts.filter((p) => p.prose && hasWords(p.prose));
+  if (!prose.length) return text;
+  const outs = await translateMany(prose.map((p) => p.prose.trim()));
+  prose.forEach((p, i) => {
+    const lead = p.prose.match(/^\s*/)[0], trail = p.prose.match(/\s*$/)[0];
+    p.out = lead + String(outs[i] ?? p.prose.trim()) + trail;
+  });
+  return parts.map((p) => p.keep ?? p.out ?? p.prose).join('');
+}