diff --git a/languageserver/go.sum b/languageserver/go.sum
index 4519f79e3c..b754f2ca95 100644
--- a/languageserver/go.sum
+++ b/languageserver/go.sum
@@ -1,6 +1,4 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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 github.com/Azure/azure-storage-blob-go v0.7.0/go.mod h1:f9YQKtsG1nMisotuTPpO0tjNuEjKRYAcJU8/ydDI++4=
@@ -15,39 +13,18 @@ github.com/Azure/go-autorest/autorest/mocks v0.3.0/go.mod h1:a8FDP3DYzQ4RYfVAxAN
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@@ -57,165 +34,60 @@ github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XL
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@@ -613,13 +245,9 @@ gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8
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 gopkg.in/sourcemap.v1 v1.0.5/go.mod h1:2RlvNNSMglmRrcvhfuzp4hQHwOtjxlbjX7UPY/GXb78=
-gopkg.in/src-d/go-cli.v0 v0.0.0-20181105080154-d492247bbc0d/go.mod h1:z+K8VcOYVYcSwSjGebuDL6176A1XskgbtNl64NSg+n8=
-gopkg.in/src-d/go-log.v1 v1.0.1/go.mod h1:GN34hKP0g305ysm2/hctJ0Y8nWP3zxXXJ8GFabTyABE=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/urfave/cli.v1 v1.20.0/go.mod h1:vuBzUtMdQeixQj8LVd+/98pzhxNGQoyuPBlsXHOQNO0=
-gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4 h1:/eiJrUcujPVeJ3xlSWaiNi3uSVmDGBK1pDHUHAnao1I=
@@ -629,7 +257,3 @@ gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=
-rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
-rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
-zombiezen.com/go/capnproto2 v2.18.0+incompatible/go.mod h1:XO5Pr2SbXgqZwn0m0Ru54QBqpOf4K5AYBO+8LAOBQEQ=
diff --git a/tools/vscode-extension/out/test/extension.test.js b/tools/vscode-extension/out/test/extension.test.js
index 895242bb85..2d35c9d45f 100644
--- a/tools/vscode-extension/out/test/extension.test.js
+++ b/tools/vscode-extension/out/test/extension.test.js
@@ -1,21 +1,3 @@
-/*
- * Cadence - The resource-oriented smart contract programming language
- *
- * Copyright 2019-2020 Dapper Labs, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
 "use strict";
 //
 // Note: This example test is leveraging the Mocha test framework.
diff --git a/tools/vscode-extension/out/test/index.js b/tools/vscode-extension/out/test/index.js
index 8864843922..7608a29f78 100644
--- a/tools/vscode-extension/out/test/index.js
+++ b/tools/vscode-extension/out/test/index.js
@@ -1,21 +1,3 @@
-/*
- * Cadence - The resource-oriented smart contract programming language
- *
- * Copyright 2019-2020 Dapper Labs, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
 "use strict";
 //
 // PLEASE DO NOT MODIFY / DELETE UNLESS YOU KNOW WHAT YOU ARE DOING
diff --git a/tools/vscode-extension/package.json b/tools/vscode-extension/package.json
index 4a478eb4bc..627e57cd95 100644
--- a/tools/vscode-extension/package.json
+++ b/tools/vscode-extension/package.json
@@ -3,7 +3,7 @@
   "displayName": "Cadence",
   "publisher": "dapperlabs",
   "description": "",
-  "version": "0.1.0",
+  "version": "0.4.0",
   "repository": {
     "type": "git",
     "url": "https://github.com/onflow/cadence.git"
@@ -56,22 +56,22 @@
           "description": "The command to invoke the Flow CLI",
           "scope": "resource"
         },
-        "cadence.rootPrivateKey": {
+        "cadence.servicePrivateKey": {
           "type": "string",
           "default": "bf9db4706c2fdb9011ee7e170ccac492f05427b96ab41d8bf2d8c58443704b76",
-          "description": "The private key of the root account to use when submitting transactions",
+          "description": "The private key of the service account to use when submitting transactions",
           "scope": "resource"
         },
-        "cadence.rootKeySignatureAlgorithm": {
+        "cadence.serviceKeySignatureAlgorithm": {
           "type": "string",
           "default": "ECDSA_P256",
-          "description": "The signature algorithm of the root account to use when submitting transactions",
+          "description": "The signature algorithm of the service account to use when submitting transactions",
           "scope": "resource"
         },
-        "cadence.rootKeyHashAlgorithm": {
+        "cadence.serviceKeyHashAlgorithm": {
           "type": "string",
           "default": "SHA3_256",
-          "description": "The hash algorithm of the root account to use when submitting transactions",
+          "description": "The hash algorithm of the service account to use when submitting transactions",
           "scope": "resource"
         },
         "cadence.emulatorAddress": {
diff --git a/tools/vscode-extension/src/address.ts b/tools/vscode-extension/src/address.ts
index e1c14229f4..18b2eaa1ca 100644
--- a/tools/vscode-extension/src/address.ts
+++ b/tools/vscode-extension/src/address.ts
@@ -1,18 +1,14 @@
 const addressPrefix = "0x";
 
-// Format an address by trimming leading zeros and enforcing an even length.
-export function shortAddress(address: string): string {
-    const addressInt = parseInt(address, 16);
-
-    let addressStr = addressInt.toString(16);
-    if (addressStr.length % 2 !== 0) {
-        addressStr = `0${addressStr}`;
+export function addAddressPrefix(address: string): string {
+    if (address.slice(0, 2) === addressPrefix) {
+        return address;
     }
 
-    return `${addressPrefix}${addressStr}`;
+    return addressPrefix + address;
 }
 
-export function stripAddressPrefix(address: string): string {
+export function removeAddressPrefix(address: string): string {
     if (address.slice(0, 2) === addressPrefix) {
         return address.slice(2);
     }
diff --git a/tools/vscode-extension/src/commands.ts b/tools/vscode-extension/src/commands.ts
index 4e38b19613..024b8f9d8d 100644
--- a/tools/vscode-extension/src/commands.ts
+++ b/tools/vscode-extension/src/commands.ts
@@ -2,7 +2,7 @@ import {commands, ExtensionContext, Position, Range, window, workspace} from "vs
 import {Extension, renderExtension} from "./extension";
 import {LanguageServerAPI} from "./language-server";
 import {createTerminal} from "./terminal";
-import {shortAddress, stripAddressPrefix} from "./address";
+import {removeAddressPrefix} from "./address";
 
 // Command identifiers for locally handled commands
 export const RESTART_SERVER = "cadence.restartServer";
@@ -39,22 +39,22 @@ const restartServer = (ext: Extension) => async () => {
 
 // Starts the emulator in a terminal window.
 const startEmulator = (ext: Extension) => async () => {
-    // Start the emulator with the root key we gave to the language server.
+    // Start the emulator with the service key we gave to the language server.
     const {serverConfig} = ext.config
 
     ext.terminal.sendText(
         [
             ext.config.flowCommand,
             `emulator`, `start`, `--init`, `--verbose`,
-            `--root-priv-key`, serverConfig.rootPrivateKey,
-            `--root-sig-algo`, serverConfig.rootKeySignatureAlgorithm,
-            `--root-hash-algo`, serverConfig.rootKeyHashAlgorithm,
+            `--service-priv-key`, serverConfig.servicePrivateKey,
+            `--service-sig-algo`, serverConfig.serviceKeySignatureAlgorithm,
+            `--service-hash-algo`, serverConfig.serviceKeyHashAlgorithm,
         ].join(" ")
     );
     ext.terminal.show();
 
     // create default accounts after the emulator has started
-    // skip root account since it is already created
+    // skip service account since it is already created
     setTimeout(async () => {
         try {
             const accounts = await ext.api.createDefaultAccounts(ext.config.numAccounts - 1);
@@ -98,9 +98,17 @@ const switchActiveAccount = (ext: Extension) => async () => {
     const activeSuffix = "(active)";
     // Create the options (mark the active account with an 'active' prefix)
     const accountOptions = Object
-        .keys(ext.config.accounts)
+        .values(ext.config.accounts)
         // Mark the active account with a `*` in the dialog
-        .map(addr => addr === ext.config.activeAccount ? `${shortAddress(addr)} ${activeSuffix}` : shortAddress(addr));
+        .map((account) => {
+            const suffix: String = account.index === ext.config.activeAccount ? ` ${activeSuffix}` : "";
+            const label = `${account.fullName()}${suffix}`;
+
+            return {
+                label: label, 
+                target: account.index 
+            }
+        })
 
     window.showQuickPick(accountOptions)
         .then(selected => {
@@ -109,17 +117,17 @@ const switchActiveAccount = (ext: Extension) => async () => {
             if (selected === undefined) {
                 return;
             }
-            // If the user selected the active account, remove the `*` prefix
-            if (selected.endsWith(activeSuffix)) {
-                selected = selected.slice(0, -activeSuffix.length).trim();
-            }
-            if (!ext.config.accounts[selected]) {
-                console.error('Switched to invalid account: ', selected);
+
+            const activeIndex = selected.target;
+            const activeAccount = ext.config.getAccount(activeIndex);
+
+            if (!activeAccount) {
+                console.error('Switched to invalid account');
                 return;
             }
 
             try {
-                ext.api.switchActiveAccount(stripAddressPrefix(selected));
+                ext.api.switchActiveAccount(removeAddressPrefix(activeAccount.address));
                 window.visibleTextEditors.forEach(editor => {
                     if (!editor.document.lineCount) {
                         return;
@@ -142,8 +150,11 @@ const switchActiveAccount = (ext: Extension) => async () => {
                 console.error(err);
                 return;
             }
-            ext.config.activeAccount = selected;
-            window.showInformationMessage(`Switched to account ${selected}`);
+
+            ext.config.setActiveAccount(activeIndex)
+
+            window.showInformationMessage(`Switched to account ${activeAccount.fullName()}`);
+
             renderExtension(ext);
         });
 };
diff --git a/tools/vscode-extension/src/config.ts b/tools/vscode-extension/src/config.ts
index 63967354db..b71575dd6e 100644
--- a/tools/vscode-extension/src/config.ts
+++ b/tools/vscode-extension/src/config.ts
@@ -1,31 +1,43 @@
 import {commands, window, workspace} from "vscode";
-import {shortAddress} from "./address";
+import { addAddressPrefix } from "./address";
 
-export const ROOT_ADDR: string = shortAddress("0000000000000000000000000000000000000001");
+export const SERVICE_ADDR: string = "f8d6e0586b0a20c7";
 
 const CONFIG_FLOW_COMMAND = "flowCommand";
-const CONFIG_ROOT_PRIVATE_KEY = "rootPrivateKey";
-const CONFIG_ROOT_KEY_SIGNATURE_ALGORITHM = "rootKeySignatureAlgorithm";
-const CONFIG_ROOT_KEY_HASH_ALGORITHM = "rootKeyHashAlgorithm";
+const CONFIG_SERVICE_PRIVATE_KEY = "servicePrivateKey";
+const CONFIG_SERVICE_KEY_SIGNATURE_ALGORITHM = "serviceKeySignatureAlgorithm";
+const CONFIG_SERVICE_KEY_HASH_ALGORITHM = "serviceKeyHashAlgorithm";
 const CONFIG_EMULATOR_ADDRESS = "emulatorAddress";
 const CONFIG_NUM_ACCOUNTS = "numAccounts";
 
-// A created account that we can submit transactions for.
-type Account = {
+// An account that can be used to submit transactions.
+export class Account {
+    index: number
     address: string
-};
 
-type AccountSet = {[key: string]: Account};
+    constructor(index: number, address: string) {
+        this.index = index;
+        this.address = address;
+    }
+
+    name(): string {
+        return this.index === 0 ? "Service Account" : `Account ${this.index}`;
+    }
+
+    fullName(): string {
+        return `${this.name()} (${addAddressPrefix(this.address)})`;
+    }
+};
 
 // The subset of extension configuration used by the language server.
 type ServerConfig = {
-    rootPrivateKey: string
-    rootKeySignatureAlgorithm: string
-    rootKeyHashAlgorithm: string
+    servicePrivateKey: string
+    serviceKeySignatureAlgorithm: string
+    serviceKeyHashAlgorithm: string
     emulatorAddress: string
 };
 
-// The config used by the extension
+// The configuration used by the extension.
 export class Config {
     // The name of the flow CLI executable
     flowCommand: string;
@@ -33,27 +45,43 @@ export class Config {
     numAccounts: number;
     // Set of created accounts for which we can submit transactions.
     // Mapping from account address to account object.
-    accounts: AccountSet;
-    // Address of the currently active account.
-    activeAccount: string;
+    accounts: Array<Account>;
+    // Index of the currently active account.
+    activeAccount: number;
 
     constructor(flowCommand: string, numAccounts: number, serverConfig: ServerConfig) {
         this.flowCommand = flowCommand;
         this.numAccounts = numAccounts;
         this.serverConfig = serverConfig;
-        this.accounts = {[ROOT_ADDR]: {address: ROOT_ADDR}};
-        this.activeAccount = ROOT_ADDR;
+        this.accounts = [new Account(0, SERVICE_ADDR)];
+        this.activeAccount = 0;
     }
 
     addAccount(address: string) {
-        address = shortAddress(address);
-        this.accounts[address] = {address: address};
+        const index = this.accounts.length;
+        this.accounts.push(new Account(index, address));
+    }
+
+    setActiveAccount(index: number) {
+        this.activeAccount = index;
+    }
+    
+    getActiveAccount(): Account {
+        return this.accounts[this.activeAccount];
+    }
+
+    getAccount(index: number): Account|null {
+        if (index < 0 || index >= this.accounts.length) {
+            return null;
+        }
+
+        return this.accounts[index]
     }
 
     // Resets account state
     resetAccounts() {
-        this.accounts = {[ROOT_ADDR]: {address: ROOT_ADDR}};
-        this.activeAccount = ROOT_ADDR;
+        this.accounts = [new Account(0, SERVICE_ADDR)];
+        this.activeAccount = 0;
     }
 }
 
@@ -67,19 +95,19 @@ export function getConfig(): Config {
         throw new Error(`Missing ${CONFIG_FLOW_COMMAND} config`);
     }
 
-    const rootPrivateKey: string | undefined = cadenceConfig.get(CONFIG_ROOT_PRIVATE_KEY);
-    if (!rootPrivateKey) {
-        throw new Error(`Missing ${CONFIG_ROOT_PRIVATE_KEY} config`);
+    const servicePrivateKey: string | undefined = cadenceConfig.get(CONFIG_SERVICE_PRIVATE_KEY);
+    if (!servicePrivateKey) {
+        throw new Error(`Missing ${CONFIG_SERVICE_PRIVATE_KEY} config`);
     }
 
-    const rootKeySignatureAlgorithm: string | undefined = cadenceConfig.get(CONFIG_ROOT_KEY_SIGNATURE_ALGORITHM);
-    if (!rootKeySignatureAlgorithm) {
-        throw new Error(`Missing ${CONFIG_ROOT_KEY_SIGNATURE_ALGORITHM} config`);
+    const serviceKeySignatureAlgorithm: string | undefined = cadenceConfig.get(CONFIG_SERVICE_KEY_SIGNATURE_ALGORITHM);
+    if (!serviceKeySignatureAlgorithm) {
+        throw new Error(`Missing ${CONFIG_SERVICE_KEY_SIGNATURE_ALGORITHM} config`);
     }
 
-    const rootKeyHashAlgorithm: string | undefined = cadenceConfig.get(CONFIG_ROOT_KEY_HASH_ALGORITHM);
-    if (!rootKeyHashAlgorithm) {
-        throw new Error(`Missing ${CONFIG_ROOT_KEY_HASH_ALGORITHM} config`);
+    const serviceKeyHashAlgorithm: string | undefined = cadenceConfig.get(CONFIG_SERVICE_KEY_HASH_ALGORITHM);
+    if (!serviceKeyHashAlgorithm) {
+        throw new Error(`Missing ${CONFIG_SERVICE_KEY_HASH_ALGORITHM} config`);
     }
 
     const emulatorAddress: string | undefined = cadenceConfig.get(CONFIG_EMULATOR_ADDRESS);
@@ -93,9 +121,9 @@ export function getConfig(): Config {
     }
 
     const serverConfig: ServerConfig = {
-        rootPrivateKey,
-        rootKeySignatureAlgorithm,
-        rootKeyHashAlgorithm,
+        servicePrivateKey,
+        serviceKeySignatureAlgorithm,
+        serviceKeyHashAlgorithm,
         emulatorAddress
     };
 
diff --git a/tools/vscode-extension/src/extension.ts b/tools/vscode-extension/src/extension.ts
index 6ddc4805a5..767faec5bc 100644
--- a/tools/vscode-extension/src/extension.ts
+++ b/tools/vscode-extension/src/extension.ts
@@ -53,5 +53,5 @@ export function activate(ctx: ExtensionContext) {
 export function deactivate() {}
 
 export function renderExtension(ext: Extension) {
-    updateActiveAccountStatusBarItem(ext.activeAccountStatusBarItem, ext.config.activeAccount);
+    updateActiveAccountStatusBarItem(ext.activeAccountStatusBarItem, ext.config.getActiveAccount());
 }
diff --git a/tools/vscode-extension/src/status-bar.ts b/tools/vscode-extension/src/status-bar.ts
index 142766245f..a2a2365bda 100644
--- a/tools/vscode-extension/src/status-bar.ts
+++ b/tools/vscode-extension/src/status-bar.ts
@@ -3,6 +3,7 @@ import {
     StatusBarItem,
     StatusBarAlignment,
 } from "vscode";
+import {Account} from "./config";
 import {SWITCH_ACCOUNT} from "./commands";
 
 export function createActiveAccountStatusBarItem(): StatusBarItem {
@@ -11,7 +12,7 @@ export function createActiveAccountStatusBarItem(): StatusBarItem {
     return statusBarItem
 }
 
-export function updateActiveAccountStatusBarItem(statusBarItem: StatusBarItem, activeAccount: string): void {
-    statusBarItem.text = `$(key) Active account: ${activeAccount}`
+export function updateActiveAccountStatusBarItem(statusBarItem: StatusBarItem, activeAccount: Account): void {
+    statusBarItem.text = `$(key) Active account: ${activeAccount.fullName()}`
     statusBarItem.show()
 }