diff --git a/src/index.html b/src/index.html
index 184e7d5..8ad93c2 100644
--- a/src/index.html
+++ b/src/index.html
@@ -392,6 +392,7 @@
         <script src="/js/jquery.min.js"></script>
         <script src="/js/bootstrap.min.js"></script>
         <script src="/js/bitcoinjs-1-5-7.js"></script>
+        <script src="/js/bitcoinjs-extensions.js"></script>
         <script src="/js/sjcl-bip39.js"></script>
         <script src="/js/wordlist_english.js"></script>
         <script src="/js/jsbip39.js"></script>
diff --git a/src/js/bitcoinjs-extensions.js b/src/js/bitcoinjs-extensions.js
new file mode 100644
index 0000000..856be95
--- /dev/null
+++ b/src/js/bitcoinjs-extensions.js
@@ -0,0 +1,27 @@
+bitcoin.networks.shadow = {
+  magicPrefix: '\x19ShadowCash Signed Message:\n',
+  bip32: {
+    public: 0xEE80286A,
+    private: 0xEE8031E8
+  },
+  pubKeyHash: 0x3f,
+  scriptHash: 0x7d,
+  wif: 0xbf,
+  dustThreshold: 0,
+  feePerKb: 1000,
+  estimateFee: function() { return "unused in this app" },
+};
+
+bitcoin.networks.shadowtn = {
+  magicPrefix: '\x19ShadowCash Signed Message:\n',
+  bip32: {
+    public: 0x76C0FDFB,
+    private: 0x76C1077A
+  },
+  pubKeyHash: 0x7f,
+  scriptHash: 0xc4,
+  wif: 0xff,
+  dustThreshold: 0,
+  feePerKb: 1000,
+  estimateFee: function() { return "unused in this app" },
+};