diff --git a/lib/env-browser.js b/lib/env-browser.js
new file mode 100644
index 00000000..8cef81cc
--- /dev/null
+++ b/lib/env-browser.js
@@ -0,0 +1,311 @@
+/*!
+ * env.js - environment for bcoin
+ * Copyright (c) 2014-2015, Fedor Indutny (MIT License).
+ * Copyright (c) 2014-2017, Christopher Jeffrey (MIT License).
+ * https://github.com/bcoin-org/bcoin
+ */
+
+'use strict';
+
+/**
+ * A bcoin "environment" which exposes all
+ * constructors for primitives, the blockchain,
+ * mempool, wallet, etc. It also exposes a
+ * global worker pool.
+ * @exports Environment
+ * @constructor
+ * @property {Function} env - See {@link Environment}.
+ *
+ * @property {Function} bn - See {@url https://github.com/indutny/bn.js}.
+ * @property {Object} elliptic - See {@url https://github.com/indutny/elliptic}.
+ *
+ * @property {Object} bip70 - See {@link module:bip70}.
+ *
+ * @property {Object} blockchain - See {@link module:blockchain}.
+ * @property {Function} chain - See {@link module:blockchain.Chain}.
+ * @property {Function} chaindb - See {@link module:blockchain.ChainDB}.
+ * @property {Function} chainentry - See {@link module:blockchain.ChainEntry}.
+ *
+ * @property {Object} btc
+ * @property {Function} amount
+ * @property {Function} uri
+ *
+ * @property {Object} coins
+ * @property {Function} coinview
+ *
+ * @property {Object} crypto
+ * @property {Object} ec
+ * @property {Object} pk
+ * @property {Object} schnorr
+ *
+ * @property {Object} db
+ * @property {Object} ldb
+ *
+ * @property {Object} hd
+ *
+ * @property {Object} http
+ * @property {Object} rpc
+ *
+ * @property {Object} txmempool
+ * @property {Object} fees
+ * @property {Object} mempool
+ * @property {Object} mempoolentry
+ *
+ * @property {Object} mining
+ * @property {Object} miner
+ * @property {Object} minerblock
+ *
+ * @property {Object} net
+ * @property {Object} bip150
+ * @property {Object} bip151
+ * @property {Object} bip152
+ * @property {Object} dns
+ * @property {Object} packets
+ * @property {Object} peer
+ * @property {Object} pool
+ * @property {Object} tcp
+ *
+ * @property {Object} node
+ * @property {Object} config
+ * @property {Object} fullnode
+ * @property {Object} logger
+ * @property {Object} spvnode
+ *
+ * @property {Object} primitives
+ * @property {Object} address
+ * @property {Object} block
+ * @property {Object} coin
+ * @property {Object} headers
+ * @property {Object} input
+ * @property {Object} invitem
+ * @property {Object} keyring
+ * @property {Object} merkleblock
+ * @property {Object} mtx
+ * @property {Object} netaddress
+ * @property {Object} outpoint
+ * @property {Object} output
+ * @property {Object} tx
+ *
+ * @property {Object} protocol
+ * @property {Object} consensus
+ * @property {Object} errors
+ * @property {Object} network
+ * @property {Object} networks
+ * @property {Object} policy
+ * @property {Object} timedata
+ *
+ * @property {Object} txscript
+ * @property {Object} opcodes
+ * @property {Object} program
+ * @property {Object} script
+ * @property {Object} sigcache
+ * @property {Object} stack
+ * @property {Object} witness
+ *
+ * @property {Object} utils
+ * @property {Object} base32
+ * @property {Object} base58
+ * @property {Object} bloom
+ * @property {Object} co
+ * @property {Object} encoding
+ * @property {Object} lock
+ * @property {Object} reader
+ * @property {Object} staticwriter
+ * @property {Object} util
+ * @property {Object} writer
+ *
+ * @property {Object} wallet
+ * @property {Object} path
+ * @property {Object} walletkey
+ * @property {Object} walletdb
+ *
+ * @property {Object} workers
+ * @property {Object} workerpool
+ */
+
+function Environment() {
+  this.env = Environment;
+
+  // BN
+  this.bn = require('bn.js');
+  this.elliptic = require('elliptic');
+
+  // Horrible BIP
+  this.bip70 = require('./bip70');
+
+  // Blockchain
+  this.blockchain = require('./blockchain');
+  this.chain = require('./blockchain/chain');
+  this.chaindb = require('./blockchain/chaindb');
+  this.chainentry = require('./blockchain/chainentry');
+
+  // BTC
+  this.btc = require('./btc');
+  this.amount = require('./btc/amount');
+  this.uri = require('./btc/uri');
+
+  // Coins
+  this.coins = require('./coins');
+  this.coinview = require('./coins/coinview');
+
+  // Crypto
+  this.crypto = require('./crypto');
+  this.ec = require('./crypto/ec');
+  this.pk = require('./crypto/pk');
+  this.schnorr = require('./crypto/schnorr');
+
+  // DB
+  this.db = require('./db');
+  this.ldb = require('./db/ldb');
+
+  // HD
+  this.hd = require('./hd/hd');
+
+  // HTTP
+  this.http = require('./http');
+  this.rpc = require('./http/rpc');
+
+  // Mempool
+  this.txmempool = require('./mempool');
+  this.fees = require('./mempool/fees');
+  this.mempool = require('./mempool/mempool');
+  this.mempoolentry = require('./mempool/mempoolentry');
+
+  // Miner
+  this.mining = require('./mining');
+  this.miner = require('./mining/miner');
+  this.template = require('./mining/template');
+
+  // Net
+  this.net = require('./net');
+  this.bip150 = require('./net/bip150');
+  this.bip151 = require('./net/bip151');
+  this.bip152 = require('./net/bip152');
+  this.dns = require('./net/dns');
+  this.packets = require('./net/packets');
+  this.peer = require('./net/peer');
+  this.pool = require('./net/pool');
+  this.tcp = require('./net/tcp');
+
+  // Node
+  this.node = require('./node');
+  this.config = require('./node/config');
+  this.fullnode = require('./node/fullnode');
+  this.logger = require('./node/logger');
+  this.spvnode = require('./node/spvnode');
+
+  // Primitives
+  this.primitives = require('./primitives');
+  this.address = require('./primitives/address');
+  this.block = require('./primitives/block');
+  this.coin = require('./primitives/coin');
+  this.headers = require('./primitives/headers');
+  this.input = require('./primitives/input');
+  this.invitem = require('./primitives/invitem');
+  this.keyring = require('./primitives/keyring');
+  this.merkleblock = require('./primitives/merkleblock');
+  this.mtx = require('./primitives/mtx');
+  this.netaddress = require('./primitives/netaddress');
+  this.outpoint = require('./primitives/outpoint');
+  this.output = require('./primitives/output');
+  this.tx = require('./primitives/tx');
+
+  // Protocol
+  this.protocol = require('./protocol');
+  this.consensus = require('./protocol/consensus');
+  this.errors = require('./protocol/errors');
+  this.network = require('./protocol/network');
+  this.networks = require('./protocol/networks');
+  this.policy = require('./protocol/policy');
+  this.timedata = require('./protocol/timedata');
+
+  // Script
+  this.txscript = require('./script');
+  this.opcode = require('./script/opcode');
+  this.program = require('./script/program');
+  this.script = require('./script/script');
+  this.sigcache = require('./script/sigcache');
+  this.stack = require('./script/stack');
+  this.witness = require('./script/witness');
+
+  // Utils
+  this.utils = require('./utils');
+  this.base32 = require('./utils/base32');
+  this.base58 = require('./utils/base58');
+  this.bloom = require('./utils/bloom');
+  this.co = require('./utils/co');
+  this.encoding = require('./utils/encoding');
+  this.lock = require('./utils/lock');
+  this.reader = require('./utils/reader');
+  this.staticwriter = require('./utils/staticwriter');
+  this.util = require('./utils/util');
+  this.writer = require('./utils/writer');
+
+  // Wallet
+  this.wallet = require('./wallet');
+  this.path = require('./wallet/path');
+  this.walletkey = require('./wallet/walletkey');
+  this.walletdb = require('./wallet/walletdb');
+  this.walletplugin = require('./wallet/plugin');
+
+  // Workers
+  this.workers = require('./workers');
+  this.workerpool = require('./workers/workerpool');
+}
+
+/**
+ * Set the default network.
+ * @param {String} options
+ */
+
+Environment.prototype.set = function set(options) {
+  if (typeof options === 'string')
+    options = { network: options };
+
+  if (!options)
+    options = {};
+
+  if (options.network)
+    this.network.set(options.network);
+
+  this.workerpool.set(options);
+
+  if (options.sigcacheSize != null)
+    this.sigcache.resize(options.sigcacheSize);
+
+  return this;
+};
+
+/**
+ * Get the adjusted time of
+ * the default network.
+ * @returns {Number} Adjusted time.
+ */
+
+Environment.prototype.now = function now() {
+  return this.network.primary.now();
+};
+
+/**
+ * Cache all necessary modules.
+ */
+
+Environment.prototype.cache = function cache() {
+  this.bip70;
+  this.common;
+  this.crypto;
+  this.fullnode;
+  this.http;
+  this.spvnode;
+};
+
+/*
+ * Expose by converting `exports` to an
+ * Environment.
+ */
+
+exports.cache = Environment.prototype.cache;
+exports.set = Environment.prototype.set;
+exports.now = Environment.prototype.now;
+
+Environment.call(exports);
diff --git a/lib/env.js b/lib/env.js
index dc9d5a11..daf82494 100644
--- a/lib/env.js
+++ b/lib/env.js
@@ -160,7 +160,7 @@ function Environment() {
   this.require('ldb', './db/ldb');
 
   // HD
-  this.require('hd', './hd');
+  this.require('hd', './hd/hd');
 
   // HTTP
   this.require('http', './http');
diff --git a/package.json b/package.json
index 26c4b5da..20a6b5a5 100644
--- a/package.json
+++ b/package.json
@@ -30,6 +30,7 @@
   "optionalDependencies": {
     "bcoin-native": "0.0.19",
     "leveldown": "1.7.0-0",
+    "level-js": "2.2.4",
     "secp256k1": "3.2.5",
     "socket.io": "2.0.1",
     "socket.io-client": "2.0.1"
@@ -45,7 +46,6 @@
     "eslint": "^4.1.0",
     "hash.js": "^1.0.3",
     "jsdoc": "^3.4.3",
-    "level-js": "^2.2.4",
     "mocha": "^3.4.1",
     "uglify-js": "^3.0.5"
   },
@@ -71,7 +71,8 @@
     "./lib/crypto/backend": "./lib/crypto/backend-browser.js",
     "./lib/crypto/ec": "./lib/crypto/ec-elliptic.js",
     "./lib/crypto/pk": "./lib/crypto/pk-browser.js",
-    "./lib/db/backends": "./lib/db/backends-browser.js",
+    "./lib/db/backends.js": "./lib/db/backends-browser.js",
+    "./lib/env.js": "./lib/env-browser.js",
     "./lib/hd/wordlist": "./lib/hd/wordlist-browser.js",
     "./lib/http/base": "./browser/empty.js",
     "./lib/http/client": "./browser/empty.js",
@@ -95,7 +96,9 @@
     "bcoin-native": "./browser/empty.js",
     "child_process": "./browser/empty.js",
     "crypto": "./browser/empty.js",
+    "ec":"./lib/crypto/ec-elliptic.js",
     "dgram": "./browser/empty.js",
+    "dns": "./lib/net/dns-browser.js",
     "fs": "./browser/empty.js",
     "net": "./browser/empty.js",
     "os": "./browser/empty.js",