diff --git a/README.md b/README.md
index 8c8320d..b3c9061 100644
--- a/README.md
+++ b/README.md
@@ -272,13 +272,25 @@ This library uses a [proxy](https://github.com/getAlby/lightning-address-details
 
 You can disable the proxy by explicitly setting the proxy to false when initializing a lightning address:
 
+```js
+const lightningAddress = new LightningAddress("hello@getalby.com", {
+  proxy: false,
+});
 ```
-const lightningAddress = new LightningAddress("hello@getalby.com", {proxy: false});
+
+## crypto dependency
+
+If you get an `crypto is not defined` in NodeJS error you have to import it first:
+
+```js
+import * as crypto from 'crypto'; // or 'node:crypto'
+globalThis.crypto = crypto as any;
+//or: global.crypto = require('crypto');
 ```
 
 ## fetch() dependency
 
-This library relies on a global fetch object which will work in browsers and node v18.x or newer. In old version yoi can manually install a global fetch option or polyfill if needed.
+This library relies on a global fetch object which will work in browsers and node v18.x or newer. In old version you can manually install a global fetch option or polyfill if needed.
 
 For example:
 
diff --git a/examples/request-invoice.js b/examples/request-invoice.js
index 024f4be..7d2f60f 100644
--- a/examples/request-invoice.js
+++ b/examples/request-invoice.js
@@ -1,3 +1,5 @@
+import * as crypto from "crypto"; // or 'node:crypto'
+global.crypto = crypto;
 import { LightningAddress } from "@getalby/lightning-tools";
 
 const ln = new LightningAddress("hello@getalby.com");
diff --git a/package.json b/package.json
index 663b494..363fd88 100644
--- a/package.json
+++ b/package.json
@@ -38,7 +38,7 @@
     "format:fix": "prettier --loglevel silent --write '**/*.(md|json)' 'src/**/*.(js|ts)' 'examples/**/*.js'",
     "test": "jest",
     "clean": "rm -rf dist",
-    "build": "microbundle --no-sourcemap --external crypto",
+    "build": "microbundle --no-sourcemap",
     "dev": "microbundle watch",
     "prepare": "husky install"
   },
diff --git a/src/utils/sha256.ts b/src/utils/sha256.ts
index 27ad003..83c9753 100644
--- a/src/utils/sha256.ts
+++ b/src/utils/sha256.ts
@@ -1,10 +1,5 @@
 // from https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto/digest
 export async function sha256(message: string | Uint8Array) {
-  let crypto = globalThis.crypto as Pick<Crypto, "subtle">;
-  if (!crypto) {
-    crypto = await import("crypto");
-  }
-
   // encode as UTF-8
   const msgBuffer =
     typeof message === "string" ? new TextEncoder().encode(message) : message;