Replace ZCL and BTC version bytes to convert to BTCP addresses

lib/convert.js

@@ -0,0 +1,43 @@
+'use strict';
+
+const bs58check = require('bs58check');
+
+// Reserialize addresses from BTC or ZCL to BTCP
+var convertAddresses = addresses => {
+  const btcpVersionBytes = Buffer.from([0x13, 0x25]);
+
+  let btcpAddresses = [];
+
+  try {
+    for (let a of addresses) {
+      let raw = bs58check.decode(a);
+      //console.log(a);
+      //console.log(raw);
+
+      let first = raw.slice(0,1).toString('hex');
+      if (first === '00' || first === '05') { // BTC
+        let newBuffer = Buffer.concat([btcpVersionBytes, raw.slice(1)]);
+        btcpAddresses.push(bs58check.encode(newBuffer).toString());
+      } else {
+        let firstTwo = raw.slice(0,2).toString('hex')
+        if (firstTwo === '1325' || firstTwo === '13af') { // BTCP
+          btcpAddresses.push(a);
+        } else if (firstTwo === '1cb8' || firstTwo === '1cbd') { // ZCL
+          let newBuffer = Buffer.concat([btcpVersionBytes, raw.slice(2)]);
+          btcpAddresses.push(bs58check.encode(newBuffer).toString());
+        } else {
+          console.log('UNKNOWN VERSION BYTES');
+        }
+      }
+    }
+  } catch (e) { console.log('error'); throw e; }
+
+  return btcpAddresses;
+}
+
+//const exampleOutput = convertAddresses(['b1CypS2LjfM4qV5AwJkUudkJqfvwNSs2T6K', 't1euD4gB45npWpcpN7W5AuniU2sZoG3XfNE','1FH43sVnAtEkUchQyJtZGAdKGS7KZjPaJB']);
+//console.log(exampleOutput);
+
+// Run with: node lib/convert.js
+
+module.exports = {convertAddresses: convertAddresses};