network: fix/improve some chain params.

lib/blockchain/chain.js

@@ -1887,7 +1887,7 @@ Chain.prototype.getTargetAsync = co(function* getTargetAsync(block, prev) {
   var ancestors;
 
   if ((prev.height + 1) % pow.retargetInterval !== 0) {
-    if (!pow.difficultyReset)
+    if (!pow.targetReset)
       return this.getTarget(block, prev);
   }
 
@@ -1915,7 +1915,7 @@ Chain.prototype.getTarget = function getTarget(block, prev, ancestors) {
 
   // Do not retarget
   if ((prev.height + 1) % pow.retargetInterval !== 0) {
-    if (pow.difficultyReset) {
+    if (pow.targetReset) {
       // Special behavior for testnet:
       ts = block ? (block.ts || block) : this.network.now();
       if (ts > prev.ts + pow.targetSpacing * 2)

lib/blockchain/chainentry.js

@@ -171,7 +171,7 @@ ChainEntry.prototype.isGenesis = function isGenesis() {
 ChainEntry.prototype.getRetargetAncestors = function getRetargetAncestors() {
   var timespan = ChainEntry.MEDIAN_TIMESPAN;
   var interval = this.chain.network.pow.retargetInterval;
-  var reset = this.chain.network.pow.difficultyReset;
+  var reset = this.chain.network.pow.targetReset;
   var max = timespan;
 
   if ((this.height + 1) % interval === 0 || reset)

lib/protocol/networks.js

@@ -185,12 +185,12 @@ main.pow = {
   ),
 
   /**
-   * Default retarget interval.
+   * Desired retarget period in seconds.
    * @const {Number}
    * @default
    */
 
-  targetTimespan: 14 * 24 * 60 * 60, // two weeks
+  targetTimespan: 14 * 24 * 60 * 60,
 
   /**
    * Average block time.
@@ -209,12 +209,13 @@ main.pow = {
   retargetInterval: 2016,
 
   /**
-   * Allow constant retargetting on testnet.
+   * Whether to reset target if a block
+   * has not been mined recently.
    * @const {Boolean}
    * @default
    */
 
-  difficultyReset: false,
+  targetReset: false,
 
   /**
    * Do not allow retargetting.
@@ -543,10 +544,10 @@ testnet.pow = {
     '00000000000000000000000000000000000000000000001e345893fa639796e9',
     'hex'
   ),
-  targetTimespan: 14 * 24 * 60 * 60, // two weeks
+  targetTimespan: 14 * 24 * 60 * 60,
   targetSpacing: 10 * 60,
   retargetInterval: 2016,
-  difficultyReset: true,
+  targetReset: true,
   noRetargeting: false
 };
 
@@ -691,11 +692,14 @@ regtest.pow = {
     'hex'
   ),
   bits: 545259519,
-  chainwork: new BN(0),
-  targetTimespan: 14 * 24 * 60 * 60, // two weeks
+  chainwork: new BN(
+    '0000000000000000000000000000000000000000000000000000000000000002',
+    'hex'
+  ),
+  targetTimespan: 14 * 24 * 60 * 60,
   targetSpacing: 10 * 60,
   retargetInterval: 2016,
-  difficultyReset: true,
+  targetReset: true,
   noRetargeting: true
 };
 
@@ -708,8 +712,8 @@ regtest.block = {
   bip66hash: null,
   pruneAfterHeight: 1000,
   keepBlocks: 10000,
-  maxTipAge: 24 * 60 * 60,
-  slowHeight: 0x7fffffff
+  maxTipAge: 0xffffffff,
+  slowHeight: 0
 };
 
 regtest.bip30 = {};
@@ -841,11 +845,14 @@ segnet4.pow = {
     'hex'
   ),
   bits: 503447551,
-  chainwork: new BN(0),
-  targetTimespan: 14 * 24 * 60 * 60, // two weeks
+  chainwork: new BN(
+    '0000000000000000000000000000000000000000000000000000000000800040',
+    'hex'
+  ),
+  targetTimespan: 14 * 24 * 60 * 60,
   targetSpacing: 10 * 60,
   retargetInterval: 2016,
-  difficultyReset: true,
+  targetReset: true,
   noRetargeting: false
 };
 
@@ -858,8 +865,8 @@ segnet4.block = {
   bip66hash: '6c48386dc7c460defabb5640e28b6510a5f238cdbe6756c2976a7e0913000000',
   pruneAfterHeight: 1000,
   keepBlocks: 10000,
-  maxTipAge: 24 * 60 * 60,
-  slowHeight: 0x7fffffff
+  maxTipAge: 7 * 24 * 60 * 60,
+  slowHeight: 50000
 };
 
 segnet4.bip30 = {};
@@ -984,10 +991,14 @@ simnet.pow = {
     'hex'
   ),
   bits: 545259519,
-  targetTimespan: 14 * 24 * 60 * 60, // two weeks
+  chainwork: new BN(
+    '0000000000000000000000000000000000000000000000000000000000000002',
+    'hex'
+  ),
+  targetTimespan: 14 * 24 * 60 * 60,
   targetSpacing: 10 * 60,
   retargetInterval: 2016,
-  difficultyReset: true,
+  targetReset: true,
   noRetargeting: false
 };
 
@@ -1000,7 +1011,7 @@ simnet.block = {
   bip66hash: 'f67ad7695d9b662a72ff3d8edbbb2de0bfa67b13974bb9910d116d5cbd863e68',
   pruneAfterHeight: 1000,
   keepBlocks: 10000,
-  maxTipAge: 0x7fffffff,
+  maxTipAge: 0xffffffff,
   slowHeight: 0
 };