diff --git a/lib/blockchain/chainentry.js b/lib/blockchain/chainentry.js
index ec68a9be..8c28d6d2 100644
--- a/lib/blockchain/chainentry.js
+++ b/lib/blockchain/chainentry.js
@@ -556,7 +556,7 @@ ChainEntry.prototype.toHeaders = function toHeaders() {
  */
 
 ChainEntry.prototype.toInv = function toInv() {
-  return new InvItem(constants.inv.BLOCK, this.hash);
+  return new InvItem(InvItem.types.BLOCK, this.hash);
 };
 
 /**
diff --git a/lib/net/packets.js b/lib/net/packets.js
index e0f6dc9c..f307a0c3 100644
--- a/lib/net/packets.js
+++ b/lib/net/packets.js
@@ -2255,13 +2255,7 @@ FilterLoadPacket.fromRaw = function fromRaw(data, enc) {
  */
 
 FilterLoadPacket.prototype.isWithinConstraints = function isWithinConstraints() {
-  if (this.filter.size > constants.bloom.MAX_BLOOM_FILTER_SIZE * 8)
-    return false;
-
-  if (this.filter.n > constants.bloom.MAX_HASH_FUNCS)
-    return false;
-
-  return true;
+  return this.filter.isWithinConstraints();
 };
 
 /**
diff --git a/lib/net/peer.js b/lib/net/peer.js
index 5527d25a..1500a411 100644
--- a/lib/net/peer.js
+++ b/lib/net/peer.js
@@ -25,7 +25,7 @@ var Block = require('../primitives/block');
 var TX = require('../primitives/tx');
 var errors = require('../btc/errors');
 var NetAddress = require('../primitives/netaddress');
-var invTypes = constants.inv;
+var invTypes = InvItem.types;
 var packetTypes = packets.types;
 var VerifyResult = errors.VerifyResult;
 
@@ -144,7 +144,7 @@ function Peer(pool) {
         this.bip151,
         this.hostname,
         this.outbound,
-        this.pool.auth,
+        this.pool.authdb,
         this.pool.identityKey);
       this.bip151.bip150 = this.bip150;
     }
diff --git a/lib/net/pool.js b/lib/net/pool.js
index cf86241c..5aa96166 100644
--- a/lib/net/pool.js
+++ b/lib/net/pool.js
@@ -28,7 +28,7 @@ var List = require('../utils/list');
 var tcp = require('./tcp');
 var dns = require('./dns');
 var HostList = require('./hostlist');
-var invTypes = constants.inv;
+var invTypes = InvItem.types;
 var VerifyError = errors.VerifyError;
 var VerifyResult = errors.VerifyResult;
 
@@ -108,7 +108,7 @@ function Pool(options) {
   this.createServer = tcp.createServer;
   this.resolve = dns.resolve;
   this.locker = new Locker();
-  this.auth = null;
+  this.authdb = null;
   this.identityKey = null;
   this.proxyServer = null;
   this.banTime = constants.BAN_TIME;
@@ -116,8 +116,8 @@ function Pool(options) {
   this.feeRate = -1;
 
   // Required services.
-  this.needed = constants.services.NETWORK;
-  this.needed |= constants.services.WITNESS;
+  this.reqServices = constants.services.NETWORK;
+  this.reqServices |= constants.services.WITNESS;
 
   this.syncing = false;
 
@@ -166,7 +166,7 @@ Pool.prototype._initOptions = function _initOptions() {
 
   if (!this.options.witness) {
     this.address.services &= ~constants.services.WITNESS;
-    this.needed &= ~constants.services.WITNESS;
+    this.reqServices &= ~constants.services.WITNESS;
   }
 
   if (this.options.host != null) {
@@ -209,16 +209,26 @@ Pool.prototype._initOptions = function _initOptions() {
     this.proxyServer = this.options.proxyServer;
   }
 
+  if (this.options.selfish) {
+    assert(typeof this.options.selfish === 'boolean');
+    this.address.services &= ~constants.services.NETWORK;
+  }
+
+  if (this.options.spv) {
+    assert(typeof this.options.spv === 'boolean');
+    this.address.services &= ~constants.services.NETWORK;
+  }
+
   if (this.options.bip150) {
     assert(typeof this.options.bip151 === 'boolean');
 
-    this.auth = new BIP150.AuthDB();
+    this.authdb = new BIP150.AuthDB();
 
     if (this.options.authPeers)
-      this.auth.setAuthorized(this.options.authPeers);
+      this.authdb.setAuthorized(this.options.authPeers);
 
     if (this.options.knownPeers)
-      this.auth.setKnown(this.options.knownPeers);
+      this.authdb.setKnown(this.options.knownPeers);
 
     this.identityKey = this.options.identityKey || ec.generatePrivateKey();
 
@@ -249,8 +259,8 @@ Pool.prototype._initOptions = function _initOptions() {
     this.hosts.setSeeds([this.options.preferredSeed]);
 
   if (this.options.spv) {
-    this.spvFilter = Bloom.fromRate(10000, 0.001, constants.bloom.ALL);
-    this.needed |= constants.services.BLOOM;
+    this.spvFilter = Bloom.fromRate(10000, 0.001, Bloom.flags.ALL);
+    this.reqServices |= constants.services.BLOOM;
   }
 
   if (!this.options.mempool)
@@ -911,7 +921,7 @@ Pool.prototype.handleAddr = function handleAddr(peer, addrs) {
     if (!addr.isRoutable())
       continue;
 
-    if (!addr.hasServices(this.needed))
+    if (!addr.hasServices(this.reqServices))
       continue;
 
     if (this.hosts.add(addr, peer.address))
@@ -1402,7 +1412,7 @@ Pool.prototype.getHost = function getHost(unique) {
     if (!addr.isValid())
       continue;
 
-    if (!addr.hasServices(this.needed))
+    if (!addr.hasServices(this.reqServices))
       continue;
 
     if (now - entry.lastAttempt < 600 && i < 30)
diff --git a/lib/primitives/abstractblock.js b/lib/primitives/abstractblock.js
index 4f94cd66..bc5e03bc 100644
--- a/lib/primitives/abstractblock.js
+++ b/lib/primitives/abstractblock.js
@@ -330,7 +330,7 @@ AbstractBlock.prototype.rhash = function() {
  */
 
 AbstractBlock.prototype.toInv = function toInv() {
-  return new InvItem(constants.inv.BLOCK, this.hash('hex'));
+  return new InvItem(InvItem.types.BLOCK, this.hash('hex'));
 };
 
 /*
diff --git a/lib/primitives/invitem.js b/lib/primitives/invitem.js
index af1da64c..ef986741 100644
--- a/lib/primitives/invitem.js
+++ b/lib/primitives/invitem.js
@@ -28,6 +28,38 @@ function InvItem(type, hash) {
   this.hash = hash;
 }
 
+/**
+ * Inv types.
+ * @enum {Number}
+ * @default
+ */
+
+InvItem.types = {
+  ERROR: 0,
+  TX: 1,
+  BLOCK: 2,
+  FILTERED_BLOCK: 3,
+  WITNESS_TX: 1 | (1 << 30),
+  WITNESS_BLOCK: 2 | (1 << 30),
+  WITNESS_FILTERED_BLOCK: 3 | (1 << 30),
+  CMPCT_BLOCK: 4
+};
+
+/**
+ * Inv types by value.
+ * @const {RevMap}
+ */
+
+InvItem.typesByVal = util.revMap(InvItem.types);
+
+/**
+ * Witness mask for inv types.
+ * @const {Number}
+ * @default
+ */
+
+InvItem.WITNESS_MASK = 1 << 30;
+
 /**
  * Write inv item to buffer writer.
  * @param {BufferWriter} bw
@@ -108,11 +140,11 @@ InvItem.fromRaw = function fromRaw(data, enc) {
 
 InvItem.prototype.isBlock = function isBlock() {
   switch (this.type) {
-    case constants.inv.BLOCK:
-    case constants.inv.WITNESS_BLOCK:
-    case constants.inv.FILTERED_BLOCK:
-    case constants.inv.WITNESS_FILTERED_BLOCK:
-    case constants.inv.CMPCT_BLOCK:
+    case InvItem.types.BLOCK:
+    case InvItem.types.WITNESS_BLOCK:
+    case InvItem.types.FILTERED_BLOCK:
+    case InvItem.types.WITNESS_FILTERED_BLOCK:
+    case InvItem.types.CMPCT_BLOCK:
       return true;
     default:
       return false;
@@ -126,8 +158,8 @@ InvItem.prototype.isBlock = function isBlock() {
 
 InvItem.prototype.isTX = function isTX() {
   switch (this.type) {
-    case constants.inv.TX:
-    case constants.inv.WITNESS_TX:
+    case InvItem.types.TX:
+    case InvItem.types.WITNESS_TX:
       return true;
     default:
       return false;
@@ -140,7 +172,7 @@ InvItem.prototype.isTX = function isTX() {
  */
 
 InvItem.prototype.hasWitness = function hasWitness() {
-  return (this.type & constants.WITNESS_MASK) !== 0;
+  return (this.type & InvItem.WITNESS_MASK) !== 0;
 };
 
 /**
diff --git a/lib/primitives/tx.js b/lib/primitives/tx.js
index 8c5da763..a82c6168 100644
--- a/lib/primitives/tx.js
+++ b/lib/primitives/tx.js
@@ -25,6 +25,7 @@ var Output = require('./output');
 var Outpoint = require('./outpoint');
 var InvItem = require('./invitem');
 var workerPool = require('../workers/workerpool').pool;
+var Bloom = require('../utils/bloom');
 
 /*
  * Constants
@@ -1935,10 +1936,10 @@ TX.prototype.isWatched = function isWatched(filter) {
     output = this.outputs[i];
     // Test the output script
     if (output.script.test(filter)) {
-      if (filter.update === constants.filterFlags.ALL) {
+      if (filter.update === Bloom.flags.ALL) {
         prevout = Outpoint.fromTX(this, i);
         filter.add(prevout.toRaw());
-      } else if (filter.update === constants.filterFlags.PUBKEY_ONLY) {
+      } else if (filter.update === Bloom.flags.PUBKEY_ONLY) {
         if (output.script.isPubkey() || output.script.isMultisig()) {
           prevout = Outpoint.fromTX(this, i);
           filter.add(prevout.toRaw());
@@ -2016,7 +2017,7 @@ TX.prototype.wtxid = function() {
  */
 
 TX.prototype.toInv = function toInv() {
-  return new InvItem(constants.inv.TX, this.hash('hex'));
+  return new InvItem(InvItem.types.TX, this.hash('hex'));
 };
 
 /**
diff --git a/lib/protocol/constants.js b/lib/protocol/constants.js
index c3610692..069ca9c1 100644
--- a/lib/protocol/constants.js
+++ b/lib/protocol/constants.js
@@ -81,83 +81,6 @@ exports.LOCAL_SERVICES = 0
   | exports.services.BLOOM
   | exports.services.WITNESS;
 
-/**
- * Inv types.
- * @enum {Number}
- * @default
- */
-
-exports.inv = {
-  ERROR: 0,
-  TX: 1,
-  BLOCK: 2,
-  FILTERED_BLOCK: 3,
-  WITNESS_TX: 1 | (1 << 30),
-  WITNESS_BLOCK: 2 | (1 << 30),
-  WITNESS_FILTERED_BLOCK: 3 | (1 << 30),
-  CMPCT_BLOCK: 4
-};
-
-/**
- * Inv types by value.
- * @const {RevMap}
- */
-
-exports.invByVal = util.revMap(exports.inv);
-
-/**
- * Witness mask for inv types.
- * @const {Number}
- * @default
- */
-
-exports.WITNESS_MASK = 1 << 30;
-
-/**
- * Bloom filter update flags.
- * @enum {Number}
- * @default
- */
-
-exports.filterFlags = {
-  /**
-   * Never update the filter with outpoints.
-   */
-
-  NONE: 0,
-
-  /**
-   * Always update the filter with outpoints.
-   */
-
-  ALL: 1,
-
-  /**
-   * Only update the filter with outpoints if it is
-   * "asymmetric" in terms of addresses (pubkey/multisig).
-   */
-
-  PUBKEY_ONLY: 2
-};
-
-/**
- * Bloom filter limits.
- * @enum {Number}
- * @default
- */
-
-exports.bloom = {
-  MAX_BLOOM_FILTER_SIZE: 36000,
-  MAX_HASH_FUNCS: 50
-};
-
-/**
- * Bloom filter update flags by value.
- * @const {RevMap}
- */
-
-exports.filterFlagsByVal = util.revMap(exports.filterFlags);
-
 /**
  * Script opcodes.
  * @enum {Number}
diff --git a/lib/types.js b/lib/types.js
deleted file mode 100644
index 23493cb8..00000000
--- a/lib/types.js
+++ /dev/null
@@ -1,509 +0,0 @@
-/**
- * An inverse enum. Retrieves key by value.
- * @typedef {Object} RevMap
- * @global
- */
-
-/**
- * @typedef {Object} Path
- * @property {String} name - Account name.
- * @property {Number} account - Account index.
- * @property {Number} change - Change chain.
- * @property {Number} index - Address index.
- * @global
- */
-
-/**
- * One of {@link module:constants.inv}.
- * @typedef {Number|String} InvType
- * @global
- */
-
-/**
- * @typedef {Object} Outpoint
- * @property {Hash} hash
- * @property {Number} index
- * @global
- */
-
-/**
- * An output script type.
- * @see {module:constants.scriptTypes}
- * May sometimes be a string if specified.
- * @typedef {Number|String} ScriptType
- * @global
- */
-
-/**
- * A subset of {@link ScriptType}, including
- * pubkeyhash, scripthash, witnesspubkeyhash,
- * and witnessscripthash. This value
- * specifically refers to the address prefix.
- * It is a network-agnostic way of representing
- * prefixes. May sometimes be a string if
- * specified.
- * @typedef {Number|String} AddressType
- * @global
- */
-
-/**
- * A bitfield containing locktime flags.
- * @typedef {Number} LockFlags
- * @global
- */
-
-/**
- * A map of address hashes ({@link Hash} -> value).
- * @typedef {Object} AddressMap
- * @global
- */
-
-/**
- * @typedef {Object} ParsedURI
- * @property {Base58Address} address
- * @property {Amount?} amount? - Amount in satoshis.
- * @property {String?} label
- * @property {String?} message
- * @property {String?} request - Payment request URL.
- * @global
- */
-
-/**
- * Wallet ID
- * @typedef {String} WalletID
- * @global
- */
-
-/**
- * Base58 string.
- * @typedef {String} Base58String
- * @global
- */
-
-/**
- * Base58 address.
- * @typedef {String} Base58Address
- * @global
- */
-
-/**
- * Buffer or hex-string hash.
- * @typedef {Buffer|String} Hash
- * @global
- */
-
-/**
- * Reversed hex-string hash (uint256le).
- * @typedef {String} ReversedHash
- * @global
- */
-
-/**
- * Signature hash type. One of `all`, `single`, `none`, or
- * one of {@link constants.hashType}.
- * @typedef {String|Number} SighashType
- * @global
- */
-
-/**
- * Wallet balance.
- * @typedef {Object} Balance
- * @property {Amount} confirmed
- * @property {Amount} unconfirmed
- * @property {Amount} total
- * @global
- */
-
-/**
- * A satoshi amount. This is technically a
- * JS double float, but it is regularly
- * enforced to be less than 53 bits and
- * less than MAX_MONEY in various
- * functions.
- * @typedef {Number} Amount
- * @global
- */
-
-/**
- * Rate of satoshis per kB.
- * @typedef {Amount} Rate
- * @global
- */
-
-/**
- * A big number (bn.js)
- * @typedef {Object} BN
- * @global
- */
-
-/**
- * A bitfield containing script verify flags.
- * @typedef {Number} VerifyFlags
- * @global
- */
-
-/**
- * @typedef {Object} Orphan
- * @property {Hash} hash - Orphan TX hash.
- * @property {Number} index - Orphan input index.
- * @global
- */
-
-/**
- * @typedef {Object} CoinSelection
- * @property {Coin[]?} chosen - Selected coins.
- * @property {Amount} change - Amount of change to add.
- * @property {Amount} fee - Estimated fee.
- * @property {Amount} total - Total value.
- * @global
- */
-
-/**
- * @typedef {Object} DeploymentState
- * @property {VerifyFlags} flags
- * @property {LockFlags} lockFlags
- * @property {Boolean} coinbaseHeight - Whether coinbase height is enforced.
- * @property {Boolean} segwit
- * @property {Boolean} csv
- * @global
- */
-
-/**
- * @typedef {Object} SubmitOrderPacket
- * @property {Hash} hash
- * @property {TX} tx
- * @global
- */
-
-/**
- * @typedef {Object} ReplyPacket
- * @property {Hash} hash
- * @property {Number} code
- * @property {Buffer} publicKey
- * @global
- */
-
-/**
- * @typedef {Object} FilterLoadPacket
- * @see Bloom
- * @property {Buffer} filter - Serialized bloom filter.
- * @property {Number} n - Number of hash functions.
- * @property {Number} tweak - Bloom filter seed.
- * @property {String|Number} update (See {@link constants.filterFlags}).
- * @global
- */
-
-/**
- * @typedef {Object} FilterAddPacket
- * @see Bloom
- * @property {Buffer} data - Data to add to filter.
- * @global
- */
-
-/**
- * @typedef {Object} GetUTXOsPacket
- * @property {Boolean} mempool - Check mempool.
- * @property {Outpoint[]} prevout - Outpoints.
- * @global
- */
-
-/**
- * @typedef {Object} NakedCoin
- * @property {Number} version - Transaction version.
- * @property {Number} height - Transaction height (-1 if unconfirmed).
- * @property {Amount} value - Output value in satoshis.
- * @property {Script} script - Output script.
- * @property {Boolean} coinbase - Whether the containing
- * transaction is a coinbase.
- * @property {Hash} hash - Transaction hash.
- * @property {Number} index - Output index.
- * @global
- */
-
-/**
- * @typedef {Object} UTXOsPacket
- * @property {Array?} data.hits - Hits (array of
- * 1s and 0s representing a bit mask).
- * @property {Buffer?} data.map - Hit map.
- * @property {Object} data.height - Chain height.
- * @property {Hash} data.tip - Chain tip hash.
- * @property {Coin[]} data.coins
- * @global
- */
-
-/**
- * @typedef {Object} PingPacket
- * @property {BN} nonce
- * @global
- */
-
-/**
- * @typedef {Object} NakedBlock
- * @property {Number} version - Transaction version. Note that BCoin reads
- * versions as unsigned even though they are signed at the protocol level.
- * This value will never be negative.
- * @property {Hash} prevBlock
- * @property {Hash} merkleRoot
- * @property {Number} ts
- * @property {Number} bits
- * @property {Number} nonce
- * @property {Number} height
- * @property {Number} totalTX
- * @property {NakedTX[]?} txs - Only present on blocks.
- * @property {Hash[]?} hashes - Only present on merkleblocks.
- * @property {Buffer?} flags - Only present on merkleblocks.
- * @property {Number?} coinbaseHeight - Only present on compactblocks.
- * @global
- */
-
-/**
- * @typedef {Object} NakedInput
- * @property {Outpoint} prevout
- * @property {NakedScript} script - Input script.
- * @property {Number} sequence - nSequence.
- * @property {NakedWitness} witness - Witness.
- * @global
- */
-
-/**
- * @typedef {Object} NakedOutput
- * @property {Amount} value - Value in satoshis.
- * @property {NakedScript} script - Output script.
- * @global
- */
-
-/**
- * @typedef {Object} NakedCoin
- * @property {Number} version - Transaction version.
- * @property {Number} height - Transaction height (-1 if unconfirmed).
- * @property {Amount} value - Output value in satoshis.
- * @property {Script} script - Output script.
- * @property {Boolean} coinbase - Whether the containing
- * transaction is a coinbase.
- * @property {Hash} hash - Transaction hash.
- * @property {Number} index - Output index.
- * @global
- */
-
-/**
- * @typedef {Object} NakedTX
- * @property {Number} version
- * @property {Number} flag
- * @property {NakedInput[]} inputs
- * @property {NakedOutput[]} outputs
- * @property {Number} locktime
- * @global
- */
-
-/**
- * @typedef {Object} NakedScript
- * @property {Buffer} raw - Raw code.
- * @property {Array} code - Parsed code.
- * @global
- */
-
-/**
- * @typedef {Object} NakedWitness
- * @property {Buffer[]} items - Stack items.
- * @global
- */
-
-/**
- * @typedef {Object} FeeFilterPacket
- * @property {Rate} rate
- * @global
- */
-
-/**
- * One of `main`, `testnet`, `regtest`, `segnet3`, `segnet4`.
- * @typedef {String} NetworkType
- * @see {module:network.types}
- * @global
- */
-
-/*
- * Callbacks & Events
- */
-
-/**
- * @callback TXCallback
- * @param {Error?} err
- * @param {TX} tx
- * @global
- */
-
-/**
- * @callback TXSCallback
- * @param {Error?} err
- * @param {TX[]} txs
- * @global
- */
-
-/**
- * @callback MTXCallback
- * @param {Error?} err
- * @param {MTX} tx
- * @global
- */
-
-/**
- * @callback MTXSCallback
- * @param {Error?} err
- * @param {MTX[]} txs
- * @global
- */
-
-/**
- * @callback CoinCallback
- * @param {Error?} err
- * @param {Coin} tx
- * @global
- */
-
-/**
- * @callback CoinsCallback
- * @param {Error?} err
- * @param {Coin[]} tx
- * @global
- */
-
-/**
- * @callback VerifyCallback
- * @param {VerifyError?} err
- * @global
- */
-
-/**
- * @callback BlockCallback
- * @param {Error?} err
- * @param {Block} block
- * @global
- */
-
-/**
- * @callback EntryCallback
- * @param {Error?} err
- * @param {ChainEntry} entry
- * @global
- */
-
-/**
- * @callback EntriesCallback
- * @param {Error?} err
- * @param {ChainEntry[]} entry
- * @global
- */
-
-/**
- * @callback BalanceCallback
- * @param {Error?} err
- * @param {Balance} balance
- * @global
- */
-
-/**
- * @callback BooleanCallback
- * @param {Error?} err
- * @param {Boolean} result
- * @global
- */
-
-/**
- * @callback NumberCallback
- * @param {Error?} err
- * @param {Number} result
- * @global
- */
-
-/**
- * @callback HashCallback
- * @param {Error?} err
- * @param {Hash} hash
- * @global
- */
-
-/**
- * @callback HashesCallback
- * @param {Error?} err
- * @param {Hash[]} hash
- * @global
- */
-
-/**
- * @callback WalletCallback
- * @param {Error?} err
- * @param {Wallet|NakedWallet} wallet
- * @global
- */
-
-/**
- * @callback BufferCallback
- * @param {Error?} err
- * @param {Buffer} data
- * @global
- */
-
-/**
- * @callback ObjectCallback
- * @param {Error?} err
- * @param {Object} obj
- * @global
- */
-
-/**
- * @callback DeploymentCallback
- * @param {(Error|VerifyError)?} err
- * @param {DeploymentState} state
- * @global
- */
-
-/**
- * @callback MinerBlockCallback
- * @param {Error?} err
- * @param {MinerBlock} block
- * @global
- */
-
-/**
- * @callback AddressMapCallback
- * @param {Error?} err
- * @param {AddressMap} map
- * @global
- */
-
-/**
- * @callback AddressTableCallback
- * @param {Error?} err
- * @param {AddressTable} table
- * @global
- */
-
-/**
- * @callback OrphanCallback
- * @param {Error?} err
- * @param {Orphan} orphan
- * @global
- */
-
-/**
- * @callback TSHeightCallback
- * @param {Error?} err
- * @param {Number} ts
- * @param {Number} height
- * @global
- */
-
-/**
- * @callback ConfidenceCallback
- * @param {Error?} err
- * @param {Confidence} confidence
- * @global
- */
-
-/**
- * @callback HashHeightCallback
- * @param {Error?} err
- * @param {Hash} hash
- * @param {Number} height
- * @global
- */
diff --git a/lib/utils/bloom.js b/lib/utils/bloom.js
index 29502aa6..7482da51 100644
--- a/lib/utils/bloom.js
+++ b/lib/utils/bloom.js
@@ -34,7 +34,7 @@ var LN2 = 0.6931471805599453094172321214581765680755001343602552;
  * @property {Number} size
  * @property {Number} n
  * @property {Number} tweak
- * @property {Number} update - Update flag (see {@link constants.filterFlags}).
+ * @property {Number} update - Update flag (see {@link Bloom.flags}).
  */
 
 function Bloom(size, n, tweak, update) {
@@ -54,16 +54,70 @@ function Bloom(size, n, tweak, update) {
     tweak = (Math.random() * 0x100000000) >>> 0;
 
   if (update == null || update === -1)
-    update = constants.filterFlags.NONE;
+    update = Bloom.flags.NONE;
 
   if (typeof update === 'string')
-    update = constants.filterFlags[update.toUpperCase()];
+    update = Bloom.flags[update.toUpperCase()];
 
   this.n = n;
   this.tweak = tweak;
   this.update = update;
 }
 
+/**
+ * Bloom filter update flags.
+ * @enum {Number}
+ * @default
+ */
+
+Bloom.flags = {
+  /**
+   * Never update the filter with outpoints.
+   */
+
+  NONE: 0,
+
+  /**
+   * Always update the filter with outpoints.
+   */
+
+  ALL: 1,
+
+  /**
+   * Only update the filter with outpoints if it is
+   * "asymmetric" in terms of addresses (pubkey/multisig).
+   */
+
+  PUBKEY_ONLY: 2
+};
+
+/**
+ * Bloom filter update flags by value.
+ * @const {RevMap}
+ */
+
+Bloom.flagsByVal = {
+  0: 'NONE',
+  1: 'ALL',
+  2: 'PUBKEY_ONLY'
+};
+
+/**
+ * Max bloom filter size.
+ * @const {Number}
+ * @default
+ */
+
+Bloom.MAX_BLOOM_FILTER_SIZE = 36000;
+
+/**
+ * Max number of hash functions.
+ * @const {Number}
+ * @default
+ */
+
+Bloom.MAX_HASH_FUNCS = 50;
+
 /**
  * Perform the mumur3 hash on data.
  * @param {Buffer} val
@@ -164,16 +218,31 @@ Bloom.fromRate = function fromRate(items, rate, update) {
   size = (-1 / LN2SQUARED * items * Math.log(rate)) | 0;
 
   if (update !== -1)
-    size = Math.min(size, constants.bloom.MAX_BLOOM_FILTER_SIZE * 8);
+    size = Math.min(size, Bloom.MAX_BLOOM_FILTER_SIZE * 8);
 
   n = ((size / items * LN2) | 0) || 1;
 
   if (update !== -1)
-    n = Math.min(n, constants.bloom.MAX_HASH_FUNCS);
+    n = Math.min(n, Bloom.MAX_HASH_FUNCS);
 
   return new Bloom(size, n, -1, update);
 };
 
+/**
+ * Ensure the filter is within the size limits.
+ * @returns {Boolean}
+ */
+
+Bloom.prototype.isWithinConstraints = function isWithinConstraints() {
+  if (this.size > Bloom.MAX_BLOOM_FILTER_SIZE * 8)
+    return false;
+
+  if (this.n > Bloom.MAX_HASH_FUNCS)
+    return false;
+
+  return true;
+};
+
 /**
  * Get serialization size.
  * @returns {Number}
@@ -217,7 +286,7 @@ Bloom.prototype.fromReader = function fromReader(br) {
   this.n = br.readU32();
   this.tweak = br.readU32();
   this.update = br.readU8();
-  assert(constants.filterFlagsByVal[this.update] != null, 'Bad filter flag.');
+  assert(Bloom.flagsByVal[this.update] != null, 'Bad filter flag.');
   return this;
 };
 
diff --git a/test/block-test.js b/test/block-test.js
index 1969f1ff..85113a9c 100644
--- a/test/block-test.js
+++ b/test/block-test.js
@@ -135,7 +135,7 @@ describe('Block', function() {
   it('should create a merkle block', function() {
     var filter, item1, item2, mblock2;
 
-    filter = Bloom.fromRate(1000, 0.01, constants.filterFlags.NONE);
+    filter = Bloom.fromRate(1000, 0.01, Bloom.flags.NONE);
 
     item1 = '8e7445bbb8abd4b3174d80fa4c409fea6b94d96b';
     item2 = '047b00000078da0dca3b0ec2300c00d0ab4466ed10'
diff --git a/test/bloom-test.js b/test/bloom-test.js
index 80a13605..ced7076f 100644
--- a/test/bloom-test.js
+++ b/test/bloom-test.js
@@ -59,7 +59,7 @@ describe('Bloom', function() {
   });
 
   it('should serialize to the correct format', function() {
-    var filter = new Bloom(952, 6, 3624314491, constants.filterFlags.NONE);
+    var filter = new Bloom(952, 6, 3624314491, Bloom.flags.NONE);
     var item1 = '8e7445bbb8abd4b3174d80fa4c409fea6b94d96b';
     var item2 = '047b00000078da0dca3b0ec2300c00d0ab4466ed10'
       + 'e763272c6c9ca052972c69e3884a9022084215e2eef'