add support for funding

lib/coin-utils.js

@@ -0,0 +1,19 @@
+const coins = {
+  BTC: {unitScale: 8},
+  ETH: {unitScale: 18}
+}
+
+const cryptoDisplays = [
+  {cryptoCode: 'BTC', display: 'Bitcoin'},
+  {cryptoCode: 'ETH', display: 'Ethereum'}
+]
+
+module.exports = {coins, cryptoDisplays, buildUrl}
+
+function buildUrl (cryptoCode, address) {
+  switch (cryptoCode) {
+    case 'BTC': return `bitcoin:${address}`
+    case 'ETH': return `ethereum:${address}`
+    default: throw new Error(`Unsupported crypto: ${cryptoCode}`)
+  }
+}