diff --git a/src/extension/lib/woleet/woleet.js b/src/extension/lib/woleet/woleet.js
new file mode 100644
index 000000000..ead792d9b
--- /dev/null
+++ b/src/extension/lib/woleet/woleet.js
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2010-2020 Gildas Lormeau
+ * contact : gildas.lormeau <at> gmail.com
+ * 
+ * This file is part of SingleFile.
+ *
+ *   The code in this file is free software: you can redistribute it and/or 
+ *   modify it under the terms of the GNU Affero General Public License 
+ *   (GNU AGPL) as published by the Free Software Foundation, either version 3
+ *   of the License, or (at your option) any later version.
+ * 
+ *   The code in this file is distributed in the hope that it will be useful, 
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of 
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero 
+ *   General Public License for more details.
+ *
+ *   As additional permission under GNU AGPL version 3 section 7, you may 
+ *   distribute UNMODIFIED VERSIONS OF THIS file without the copy of the GNU 
+ *   AGPL normally required by section 4, provided you include this license 
+ *   notice and a URL through which recipients can access the Corresponding 
+ *   Source.
+ */
+/* global fetch */
+const urlService = "https://api.woleet.io/v1/anchor";
+const apiKey = "";
+export {
+	anchor
+};
+async function anchor(hash, userKey) {
+	let bearer = userKey || apiKey;
+	const response = await fetch(urlService, {
+		method: "POST",
+		headers: {
+			"Accept": "application/json",
+			"Content-Type": "application/json",
+			"Authorization": "Bearer " + bearer
+		},
+		body: JSON.stringify({
+			"name": hash,
+			"hash": hash,
+			"public": true
+		})
+	});
+	if (response.status == 401) {
+		const error = new Error("Your access token on Woleet is invalid. Go to __DOC_LINK__ to create your account.");
+		error.link = "https://app.woleet.io/";
+		throw error;
+	} else if (response.status == 402) {
+		const error = new Error("You have no more credits on Woleet. Go to __DOC_LINK__ to recharge them.");
+		error.link = "https://app.woleet.io/";
+		throw error;
+	} else if (response.status >= 400) {
+		throw new Error((response.statusText || ("Error " + response.status)) + " (Woleet)");
+	}
+	return response.json();
+}
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