diff --git a/README.md b/README.md
index 344cceff..85d447a1 100644
--- a/README.md
+++ b/README.md
@@ -375,7 +375,6 @@ inherit from the TX object, but can also be signed and modified.
 ``` js
 var bcoin = require('bcoin');
 var assert = require('assert');
-var constants = bcoin.constants;
 
 // Create an HD master keypair with a mnemonic.
 var master = bcoin.hd.fromMnemonic();
@@ -450,7 +449,6 @@ Let's try it more realistically:
 ``` js
 var bcoin = require('bcoin');
 var assert = require('assert');
-var constants = bcoin.constants;
 
 var master = bcoin.hd.fromMnemonic();
 var key = master.derive('m/44/0/0/0/0');
diff --git a/bench/script.js b/bench/script.js
index badbcfe6..43d985b3 100644
--- a/bench/script.js
+++ b/bench/script.js
@@ -1,7 +1,6 @@
 'use strict';
 
 var assert = require('assert');
-var constants = require('../lib/protocol/constants');
 var crypto = require('../lib/crypto/crypto');
 var Script = require('../lib/script/script');
 var bench = require('./bench');
diff --git a/bench/tx.js b/bench/tx.js
index ba02b93a..0c81c3e2 100644
--- a/bench/tx.js
+++ b/bench/tx.js
@@ -8,7 +8,6 @@ var Script = require('../lib/script/script');
 var MTX = require('../lib/primitives/mtx');
 var Coin = require('../lib/primitives/coin');
 var CoinView = require('../lib/coins/coinview');
-var constants = require('../lib/protocol/constants');
 var encoding = require('../lib/utils/encoding');
 var crypto = require('../lib/crypto/crypto');
 var bench = require('./bench');
diff --git a/lib/env.js b/lib/env.js
index 7efbf8f2..dcbd647f 100644
--- a/lib/env.js
+++ b/lib/env.js
@@ -195,7 +195,8 @@ function Environment() {
 
   // Protocol
   this.require('protocol', './protocol');
-  this.require('constants', './protocol/constants');
+  this.require('consensus', './protocol/consensus');
+  this.require('policy', './protocol/policy');
   this.require('network', './protocol/network');
   this.require('networks', './protocol/networks');
   this.require('timedata', './protocol/timedata');
diff --git a/lib/protocol/index.js b/lib/protocol/index.js
index 9799af53..2a17c7f3 100644
--- a/lib/protocol/index.js
+++ b/lib/protocol/index.js
@@ -1,6 +1,5 @@
 'use strict';
 
-exports.constants = require('./constants');
 exports.consensus = require('./consensus');
 exports.networks = require('./networks');
 exports.Network = require('./network');
diff --git a/migrate/chaindb1to2.js b/migrate/chaindb1to2.js
index 6decd28c..9044301e 100644
--- a/migrate/chaindb1to2.js
+++ b/migrate/chaindb1to2.js
@@ -1,5 +1,4 @@
 var assert = require('assert');
-var constants = require('../lib/protocol/constants');
 var encoding = require('../lib/utils/encoding');
 var networks = require('../lib/protocol/networks');
 var co = require('../lib/utils/co');
diff --git a/migrate/coins-old.js b/migrate/coins-old.js
index f3d3bf77..4fce24f0 100644
--- a/migrate/coins-old.js
+++ b/migrate/coins-old.js
@@ -8,7 +8,6 @@
 
 var assert = require('assert');
 var util = require('../lib/utils/util');
-var constants = require('../lib/protocol/constants');
 var encoding = require('../lib/utils/encoding');
 var Coin = require('../lib/primitives/coin');
 var Output = require('../lib/primitives/output');
diff --git a/migrate/ensure-tip-index.js b/migrate/ensure-tip-index.js
index afb9f5b6..ef03c434 100644
--- a/migrate/ensure-tip-index.js
+++ b/migrate/ensure-tip-index.js
@@ -1,5 +1,4 @@
 var assert = require('assert');
-var constants = require('../lib/protocol/constants');
 var encoding = require('../lib/utils/encoding');
 var co = require('../lib/utils/co');
 var BufferWriter = require('../lib/utils/writer');
diff --git a/migrate/walletdb2to3.js b/migrate/walletdb2to3.js
index eb3d366e..2bd136b6 100644
--- a/migrate/walletdb2to3.js
+++ b/migrate/walletdb2to3.js
@@ -1,6 +1,5 @@
 var bcoin = require('../');
 var walletdb = require('../lib/wallet/walletdb');
-var constants = require('../lib/protocol/constants');
 var encoding = require('../lib/utils/encoding');
 var Path = require('../lib/wallet/path');
 var MasterKey = require('../lib/wallet/masterkey');
diff --git a/migrate/walletdb3to4.js b/migrate/walletdb3to4.js
index 9c94c1f3..0c82d13a 100644
--- a/migrate/walletdb3to4.js
+++ b/migrate/walletdb3to4.js
@@ -1,6 +1,5 @@
 var assert = require('assert');
 var bcoin = require('../');
-var constants = require('../lib/protocol/constants');
 var encoding = require('../lib/utils/encoding');
 var WalletDB = require('../lib/wallet/walletdb');
 var TXDB = require('../lib/wallet/txdb');
diff --git a/migrate/walletdb4to5.js b/migrate/walletdb4to5.js
index 032c3ad1..bcfc3258 100644
--- a/migrate/walletdb4to5.js
+++ b/migrate/walletdb4to5.js
@@ -1,6 +1,5 @@
 var assert = require('assert');
 var bcoin = require('../');
-var constants = require('../lib/protocol/constants');
 var BufferWriter = require('../lib/utils/writer');
 var BufferReader = require('../lib/utils/reader');
 var util = require('../lib/utils/util');
diff --git a/migrate/walletdb5to6.js b/migrate/walletdb5to6.js
index 11211683..d7b53bdd 100644
--- a/migrate/walletdb5to6.js
+++ b/migrate/walletdb5to6.js
@@ -1,6 +1,5 @@
 var assert = require('assert');
 var bcoin = require('../');
-var constants = require('../lib/protocol/constants');
 var encoding = require('../lib/utils/encoding');
 var BufferWriter = require('../lib/utils/writer');
 var BufferReader = require('../lib/utils/reader');