diff --git a/lib/hd/private.js b/lib/hd/private.js
index 27f3a19d92..ad50a7cce8 100644
--- a/lib/hd/private.js
+++ b/lib/hd/private.js
@@ -8,7 +8,7 @@
 
 const assert = require('bsert');
 const bio = require('bufio');
-const {base58} = require('bstring');
+const base58 = require('bcrypto/lib/encoding/base58');
 const sha512 = require('bcrypto/lib/sha512');
 const hash160 = require('bcrypto/lib/hash160');
 const hash256 = require('bcrypto/lib/hash256');
diff --git a/lib/hd/public.js b/lib/hd/public.js
index 1bfd2fc3cd..2ab27a55cb 100644
--- a/lib/hd/public.js
+++ b/lib/hd/public.js
@@ -8,7 +8,7 @@
 
 const assert = require('bsert');
 const bio = require('bufio');
-const {base58} = require('bstring');
+const base58 = require('bcrypto/lib/encoding/base58');
 const sha512 = require('bcrypto/lib/sha512');
 const hash160 = require('bcrypto/lib/hash160');
 const hash256 = require('bcrypto/lib/hash256');
diff --git a/lib/net/bip152.js b/lib/net/bip152.js
index 76794aed23..3c9828efb6 100644
--- a/lib/net/bip152.js
+++ b/lib/net/bip152.js
@@ -14,7 +14,7 @@ const assert = require('bsert');
 const bio = require('bufio');
 const consensus = require('../protocol/consensus');
 const sha256 = require('bcrypto/lib/sha256');
-const {siphash} = require('bsip');
+const {siphash} = require('bcrypto/lib/siphash');
 const AbstractBlock = require('../primitives/abstractblock');
 const TX = require('../primitives/tx');
 const Headers = require('../primitives/headers');
diff --git a/lib/net/hostlist.js b/lib/net/hostlist.js
index ed31350356..41924826be 100644
--- a/lib/net/hostlist.js
+++ b/lib/net/hostlist.js
@@ -12,7 +12,7 @@ const fs = require('bfile');
 const IP = require('binet');
 const dns = require('bdns');
 const Logger = require('blgr');
-const murmur3 = require('mrmr');
+const murmur3 = require('bcrypto/lib/murmur3');
 const List = require('blst');
 const util = require('../utils/util');
 const Network = require('../protocol/network');
diff --git a/lib/node/http.js b/lib/node/http.js
index 01de675fb3..ef48ade122 100644
--- a/lib/node/http.js
+++ b/lib/node/http.js
@@ -11,7 +11,7 @@ const assert = require('bsert');
 const path = require('path');
 const {Server} = require('bweb');
 const Validator = require('bval');
-const {base58} = require('bstring');
+const base58 = require('bcrypto/lib/encoding/base58');
 const {BloomFilter} = require('bfilter');
 const sha256 = require('bcrypto/lib/sha256');
 const random = require('bcrypto/lib/random');
diff --git a/lib/primitives/address.js b/lib/primitives/address.js
index 6bb618c736..a036d175d2 100644
--- a/lib/primitives/address.js
+++ b/lib/primitives/address.js
@@ -9,7 +9,8 @@
 
 const assert = require('bsert');
 const bio = require('bufio');
-const {base58, bech32} = require('bstring');
+const base58 = require('bcrypto/lib/encoding/base58');
+const bech32 = require('bcrypto/lib/encoding/bech32');
 const sha256 = require('bcrypto/lib/sha256');
 const hash160 = require('bcrypto/lib/hash160');
 const hash256 = require('bcrypto/lib/hash256');
@@ -383,12 +384,12 @@ class Address {
 
     assert(typeof data === 'string');
 
-    const addr = bech32.decode(data);
+    const [hrp, version, hash] = bech32.decode(data);
 
     // make sure HRP is correct.
-    Network.fromBech32(addr.hrp, network);
+    Network.fromBech32(hrp, network);
 
-    return this.fromHash(addr.hash, type, addr.version);
+    return this.fromHash(hash, type, version);
   }
 
   /**
diff --git a/lib/primitives/keyring.js b/lib/primitives/keyring.js
index de55880511..d766d51a79 100644
--- a/lib/primitives/keyring.js
+++ b/lib/primitives/keyring.js
@@ -8,7 +8,7 @@
 'use strict';
 
 const assert = require('bsert');
-const {base58} = require('bstring');
+const base58 = require('bcrypto/lib/encoding/base58');
 const bio = require('bufio');
 const hash160 = require('bcrypto/lib/hash160');
 const hash256 = require('bcrypto/lib/hash256');
diff --git a/lib/utils/help.js b/lib/utils/help.js
new file mode 100644
index 0000000000..2f333858e5
--- /dev/null
+++ b/lib/utils/help.js
@@ -0,0 +1,69 @@
+'use strict';
+
+exports.formatTX = (tx) => {
+  let res = `
+TX: ${tx.txid().toString('hex')}
+  Outputs: ${tx.outputs.length}
+  Inputs: ${tx.inputs.length}\n`;
+
+  for (const {prevout} of tx.inputs)
+    res += `    ${prevout.hash.toString('hex')}/${prevout.index}\n`;
+
+  return res;
+};
+
+exports.logTX = function (tx) {
+  console.log(exports.formatTX(tx));
+};
+
+exports.formatBlock = (block) => {
+  let res = `
+Block: ${block.hash().toString('hex')}
+TXs: ${block.txs.length}\n`;
+
+  for (const tx of block.txs)
+    res += `  ${tx.txid().toString('hex')}\n`;
+
+  return res;
+};
+
+exports.logBlock = (block) => {
+  console.log(exports.formatBlock(block));
+};
+
+exports.formatEntry = (entry, txs) => {
+  let res = `Entry: ${entry.hash.toString('hex')}
+TXs: ${txs.length}\n`;
+
+  for (const tx of txs)
+    res += `  ${tx.txid().toString('hex')}\n`;
+
+  return res;
+};
+exports.logEntry =(entry, txs) => {
+  console.log(exports.formatEntry(entry, txs));
+};
+
+const lockedRegistry = new Map();
+
+exports.hackLocker = (locker, name) => {
+  const _lock = locker.lock;
+
+  locker.lock = async (...args) => {
+    const _unlock = await _lock.call(locker, ...args);
+    lockedRegistry.set(locker, name);
+
+    return (...args) => {
+      lockedRegistry.delete(locker);
+      _unlock.call(...args);
+    };
+  };
+
+  return locker;
+};
+
+exports.logLocks = () => {
+  const locks = Array.from(lockedRegistry.values());
+
+  console.log(locks.join(', '));
+};
diff --git a/lib/wallet/http.js b/lib/wallet/http.js
index 0dc6232b08..4ff6dcc5a5 100644
--- a/lib/wallet/http.js
+++ b/lib/wallet/http.js
@@ -11,7 +11,7 @@ const assert = require('bsert');
 const path = require('path');
 const {Server} = require('bweb');
 const Validator = require('bval');
-const {base58} = require('bstring');
+const base58 = require('bcrypto/lib/encoding/base58');
 const MTX = require('../primitives/mtx');
 const Outpoint = require('../primitives/outpoint');
 const Script = require('../script/script');
diff --git a/lib/wallet/wallet.js b/lib/wallet/wallet.js
index b424695354..c9ac424426 100644
--- a/lib/wallet/wallet.js
+++ b/lib/wallet/wallet.js
@@ -10,7 +10,7 @@
 const assert = require('bsert');
 const EventEmitter = require('events');
 const {Lock} = require('bmutex');
-const {base58} = require('bstring');
+const base58 = require('bcrypto/lib/encoding/base58');
 const bio = require('bufio');
 const hash160 = require('bcrypto/lib/hash160');
 const hash256 = require('bcrypto/lib/hash256');
diff --git a/package-lock.json b/package-lock.json
index abdf2f0b07..8d8052f56f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -23,9 +23,9 @@
       }
     },
     "bcrypto": {
-      "version": "3.1.11",
-      "resolved": "https://registry.npmjs.org/bcrypto/-/bcrypto-3.1.11.tgz",
-      "integrity": "sha512-XHsle+v0aYjCyHZSwd3Insnu8GUe4cuf3+f07Z/mO+GLq60YqUyEIvpaSv4LAAJ4uf8UNYMSSQ0LslsV0r4tug==",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/bcrypto/-/bcrypto-4.0.1.tgz",
+      "integrity": "sha512-aLH/BmVyasy9iQkrmQTg+9MRU+77zOpEBiBflaXFC4YQJNICG/NjkEEluinnvAOQWGiM4HsGcfrVFJNJQz8jxQ==",
       "requires": {
         "bsert": "~0.0.10",
         "bufio": "~1.0.6",
@@ -159,16 +159,6 @@
       "resolved": "https://registry.npmjs.org/bsert/-/bsert-0.0.10.tgz",
       "integrity": "sha512-NHNwlac+WPy4t2LoNh8pXk8uaIGH3NSaIUbTTRXGpE2WEbq0te/tDykYHkFK57YKLPjv/aGHmbqvnGeVWDz57Q=="
     },
-    "bsip": {
-      "version": "0.1.9",
-      "resolved": "https://registry.npmjs.org/bsip/-/bsip-0.1.9.tgz",
-      "integrity": "sha512-i7cVEfCthASPB3BYKS/pZN/D4kh4vToIlSAFcVBLNjzYl1UirT3E2PIGSfNnYR2qZ3UW1qnDavrWEHhLeSKt2A==",
-      "requires": {
-        "bsert": "~0.0.10",
-        "loady": "~0.0.1",
-        "nan": "^2.13.1"
-      }
-    },
     "bsock": {
       "version": "0.1.9",
       "resolved": "https://registry.npmjs.org/bsock/-/bsock-0.1.9.tgz",
@@ -186,16 +176,6 @@
         "bsert": "~0.0.10"
       }
     },
-    "bstring": {
-      "version": "0.3.9",
-      "resolved": "https://registry.npmjs.org/bstring/-/bstring-0.3.9.tgz",
-      "integrity": "sha512-D95flI7SXL+UsQi9mW+hH+AK2AFfafIJi+3GbbyTAWMe2FqwR9keBxsjGiGd/JM+77Y9WsC+M4EhZVNVcym9jw==",
-      "requires": {
-        "bsert": "~0.0.10",
-        "loady": "~0.0.1",
-        "nan": "^2.13.1"
-      }
-    },
     "btcp": {
       "version": "0.1.5",
       "resolved": "https://registry.npmjs.org/btcp/-/btcp-0.1.5.tgz",
diff --git a/package.json b/package.json
index c8f0f7b44e..26332f0f36 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
   "dependencies": {
     "bcfg": "~0.1.6",
     "bclient": "~0.1.7",
-    "bcrypto": "~3.1.11",
+    "bcrypto": "~4.0.1",
     "bdb": "~1.1.7",
     "bdns": "~0.1.5",
     "bevent": "~0.1.5",
@@ -38,17 +38,14 @@
     "blst": "~0.1.5",
     "bmutex": "~0.1.6",
     "bsert": "~0.0.10",
-    "bsip": "~0.1.9",
     "bsock": "~0.1.9",
     "bsocks": "~0.2.5",
-    "bstring": "~0.3.9",
     "btcp": "~0.1.5",
     "buffer-map": "~0.0.7",
     "bufio": "~1.0.6",
     "bupnp": "~0.2.6",
     "bval": "~0.1.6",
     "bweb": "~0.1.9",
-    "mrmr": "~0.1.8",
     "n64": "~0.2.10"
   },
   "devDependencies": {
diff --git a/test/hd-test.js b/test/hd-test.js
index d92cf97a9b..b091253a6e 100644
--- a/test/hd-test.js
+++ b/test/hd-test.js
@@ -3,7 +3,7 @@
 
 'use strict';
 
-const {base58} = require('bstring');
+const base58 = require('bcrypto/lib/encoding/base58');
 const pbkdf2 = require('bcrypto/lib/pbkdf2');
 const sha512 = require('bcrypto/lib/sha512');
 const assert = require('bsert');
diff --git a/test/utils-test.js b/test/utils-test.js
index e01bb4c950..f3d6bedc42 100644
--- a/test/utils-test.js
+++ b/test/utils-test.js
@@ -4,48 +4,12 @@
 'use strict';
 
 const Validator = require('bval');
-const {base58} = require('bstring');
 const {encoding} = require('bufio');
 const assert = require('bsert');
 const Amount = require('../lib/btc/amount');
 const fixed = require('../lib/utils/fixed');
 
-const base58Tests = [
-  ['', ''],
-  ['61', '2g'],
-  ['626262', 'a3gV'],
-  ['636363', 'aPEr'],
-  [
-    '73696d706c792061206c6f6e6720737472696e67',
-    '2cFupjhnEsSn59qHXstmK2ffpLv2'
-  ],
-  [
-    '00eb15231dfceb60925886b67d065299925915aeb172c06647',
-    '1NS17iag9jJgTHD1VXjvLCEnZuQ3rJDE9L'
-  ],
-  ['516b6fcd0f', 'ABnLTmg'],
-  ['bf4f89001e670274dd', '3SEo3LWLoPntC'],
-  ['572e4794', '3EFU7m'],
-  ['ecac89cad93923c02321', 'EJDM8drfXA6uyA'],
-  ['10c8511e', 'Rt5zm'],
-  ['00000000000000000000', '1111111111']
-];
-
 describe('Utils', function() {
-  it('should encode/decode base58', () => {
-    const buf = Buffer.from('000000deadbeef', 'hex');
-    const str = base58.encode(buf);
-
-    assert.strictEqual(str, '1116h8cQN');
-    assert.bufferEqual(base58.decode(str), buf);
-
-    for (const [hex, b58] of base58Tests) {
-      const data = Buffer.from(hex, 'hex');
-      assert.strictEqual(base58.encode(data), b58);
-      assert.bufferEqual(base58.decode(b58), data);
-    }
-  });
-
   it('should convert satoshi to btc', () => {
     assert.strictEqual(Amount.btc(5460), '0.0000546');
     assert.strictEqual(Amount.btc(54678 * 1000000), '546.78');