diff --git a/lib/blockchain/chain.js b/lib/blockchain/chain.js
index c2ff9d6b..34f13eec 100644
--- a/lib/blockchain/chain.js
+++ b/lib/blockchain/chain.js
@@ -87,7 +87,7 @@ function Chain(options) {
   this.height = -1;
   this.synced = false;
   this.state = new DeploymentState();
-  this._time = util.hrtime();
+  this.startTime = util.hrtime();
 
   this.orphanMap = {};
   this.orphanPrev = {};
@@ -264,8 +264,7 @@ Chain.prototype.isGenesis = function isGenesis(block) {
  * @private
  * @param {Block|MerkleBlock} block
  * @param {ChainEntry} entry
- * @returns {Promise}
- * [{@link VerifyError}, {@link VerifyFlags}].
+ * @returns {Promise} - Returns [{@link VerifyError}, {@link VerifyFlags}].
  */
 
 Chain.prototype.verify = co(function* verify(block, prev) {
@@ -429,8 +428,7 @@ Chain.prototype.verify = co(function* verify(block, prev) {
  * Check all deployments on a chain, ranging from p2sh to segwit.
  * @param {Block} block
  * @param {ChainEntry} prev
- * @returns {Promise}
- * [{@link VerifyError}, {@link DeploymentState}].
+ * @returns {Promise} - Returns [{@link VerifyError}, {@link DeploymentState}].
  */
 
 Chain.prototype.getDeployments = co(function* getDeployments(block, prev) {
@@ -1329,7 +1327,7 @@ Chain.prototype.isSlow = function isSlow() {
  */
 
 Chain.prototype.mark = function mark() {
-  this._time = util.hrtime();
+  this.startTime = util.hrtime();
 };
 
 /**
@@ -1353,7 +1351,7 @@ Chain.prototype.finish = function finish(block, entry) {
   util.gc();
   this.logger.memory();
 
-  elapsed = util.hrtime(this._time);
+  elapsed = util.hrtime(this.startTime);
   time = elapsed[0] * 1000 + elapsed[1] / 1e6;
 
   this.logger.info(