Use blockchain.info (temporary) to retrieve address & transactions infos

package.json

@@ -36,6 +36,7 @@
     "@ledgerhq/hw-app-eth": "^1.1.2-beta.068e2a14",
     "@ledgerhq/hw-transport": "^1.1.2-beta.068e2a14",
     "@ledgerhq/hw-transport-node-hid": "^1.1.2-beta.068e2a14",
+    "blockchain.info": "^2.11.0",
     "bcryptjs": "^2.4.3",
     "color": "^2.0.1",
     "downshift": "^1.25.0",

src/helpers/btc.js

@@ -0,0 +1,29 @@
+import blockexplorer from 'blockchain.info/blockexplorer'
+
+const explorer = blockexplorer.usingNetwork(3)
+
+function computeTransaction(address) {
+  return transaction => {
+    const outputVal = transaction.out
+      .filter(o => o.addr === address)
+      .reduce((acc, cur) => acc + cur.value, 0)
+    const inputVal = transaction.inputs
+      .filter(i => i.prev_out.addr === address)
+      .reduce((acc, cur) => acc + cur.prev_out.value, 0)
+    const balance = outputVal - inputVal
+    return {
+      ...transaction,
+      balance,
+    }
+  }
+}
+
+export async function getAddressData(address) {
+  const addressData = await explorer.getAddress(address)
+  const unifiedData = {
+    address,
+    balance: addressData.final_balance,
+    transactions: addressData.txs.map(computeTransaction(address)),
+  }
+  return unifiedData
+}