diff --git a/lib/mempool/mempool.js b/lib/mempool/mempool.js
index c0715bee..365c190a 100644
--- a/lib/mempool/mempool.js
+++ b/lib/mempool/mempool.js
@@ -108,48 +108,15 @@ function Mempool(options) {
   this.paranoid = !!this.options.paranoid;
   this.replaceByFee = !!this.options.replaceByFee;
 
-  this.maxSize = options.maxSize || Mempool.MAX_SIZE;
-  this.maxOrphans = options.maxOrphans || Mempool.MAX_ORPHANS;
-  this.maxAncestors = options.maxAncestors || Mempool.ANCESTOR_LIMIT;
-  this.expiryTime = options.expiryTime || Mempool.EXPIRY_TIME;
+  this.maxSize = options.maxSize || policy.MEMPOOL_MAX_SIZE;
+  this.maxOrphans = options.maxOrphans || policy.MEMPOOL_MAX_ORPHANS;
+  this.maxAncestors = options.maxAncestors || policy.MEMPOOL_MAX_ANCESTORS;
+  this.expiryTime = options.expiryTime || policy.MEMPOOL_EXPIRY_TIME;
   this.minRelay = this.network.minRelay;
 }
 
 util.inherits(Mempool, AsyncObject);
 
-/**
- * Default ancestor limit.
- * @const {Number}
- * @default
- */
-
-Mempool.ANCESTOR_LIMIT = 25;
-
-/**
- * Default maximum mempool size in bytes.
- * @const {Number}
- * @default
- */
-
-Mempool.MAX_SIZE = 100 * 1000000;
-
-/**
- * Time at which transactions
- * fall out of the mempool.
- * @const {Number}
- * @default
- */
-
-Mempool.EXPIRY_TIME = 72 * 60 * 60;
-
-/**
- * Maximum number of orphan transactions.
- * @const {Number}
- * @default
- */
-
-Mempool.MAX_ORPHANS = 100;
-
 /**
  * Open the chain, wait for the database to load.
  * @alias Mempool#open
diff --git a/lib/mining/miner.js b/lib/mining/miner.js
index 6b02e475..367f573a 100644
--- a/lib/mining/miner.js
+++ b/lib/mining/miner.js
@@ -53,11 +53,11 @@ function Miner(options) {
   this.addresses = [];
   this.coinbaseFlags = new Buffer('mined by bcoin', 'ascii');
 
-  this.minWeight = 0;
-  this.maxWeight = 750000 * consensus.WITNESS_SCALE_FACTOR;
+  this.minWeight = policy.MIN_BLOCK_WEIGHT;
+  this.maxWeight = policy.MAX_BLOCK_WEIGHT;
+  this.priorityWeight = policy.PRIORITY_BLOCK_WEIGHT;
+  this.minPriority = policy.MIN_BLOCK_PRIORITY;
   this.maxSigops = consensus.MAX_BLOCK_SIGOPS_COST;
-  this.priorityWeight = 50000 * consensus.WITNESS_SCALE_FACTOR;
-  this.minPriority = policy.FREE_THRESHOLD;
 
   this._initOptions(options);
   this._init();
diff --git a/lib/protocol/policy.js b/lib/protocol/policy.js
index 37bf1095..25d492a0 100644
--- a/lib/protocol/policy.js
+++ b/lib/protocol/policy.js
@@ -135,12 +135,37 @@ exports.MAX_P2WSH_PUSH = 80;
 exports.MAX_P2WSH_SIZE = 3600;
 
 /**
- * Mempool ancestor limit.
+ * Default ancestor limit.
  * @const {Number}
  * @default
  */
 
-exports.ANCESTOR_LIMIT = 25;
+exports.MEMPOOL_MAX_ANCESTORS = 25;
+
+/**
+ * Default maximum mempool size in bytes.
+ * @const {Number}
+ * @default
+ */
+
+exports.MEMPOOL_MAX_SIZE = 100 * 1000000;
+
+/**
+ * Time at which transactions
+ * fall out of the mempool.
+ * @const {Number}
+ * @default
+ */
+
+exports.MEMPOOL_EXPIRY_TIME = 72 * 60 * 60;
+
+/**
+ * Maximum number of orphan transactions.
+ * @const {Number}
+ * @default
+ */
+
+exports.MEMPOOL_MAX_ORPHANS = 100;
 
 /**
  * Block weight to be reached before