multi: rebase bcc onto staging

lib/blockchain/chain.js

@@ -420,13 +420,6 @@ class Chain extends AsyncEmitter {
     // Get the new deployment state.
     const state = await this.getDeployments(block.time, prev);
 
-    // Enforce BIP91/BIP148.
-    if (state.hasBIP91() || state.hasBIP148()) {
-      const {segwit} = this.network.deployments;
-      if (!consensus.hasBit(block.version, segwit.bit))
-        throw new VerifyError(block, 'invalid', 'bad-no-segwit', 0);
-    }
-
     // Get timestamp for tx.isFinal().
     const time = state.hasMTP() ? mtp : block.time;
 
@@ -452,50 +445,9 @@ class Chain extends AsyncEmitter {
       }
     }
 
-    // Check the commitment hash for segwit.
-    let commit = null;
-    if (state.hasWitness()) {
-      commit = block.getCommitmentHash();
-      if (commit) {
-        // These are totally malleable. Someone
-        // may have even accidentally sent us
-        // the non-witness version of the block.
-        // We don't want to consider this block
-        // "invalid" if either of these checks
-        // fail.
-        if (!block.getWitnessNonce()) {
-          throw new VerifyError(block,
-            'invalid',
-            'bad-witness-nonce-size',
-            100,
-            true);
-        }
-
-        if (!commit.equals(block.createCommitmentHash())) {
-          throw new VerifyError(block,
-            'invalid',
-            'bad-witness-merkle-match',
-            100,
-            true);
-        }
-      }
-    }
-
-    // Blocks that do not commit to
-    // witness data cannot contain it.
-    if (!commit) {
-      if (block.hasWitness()) {
-        throw new VerifyError(block,
-          'invalid',
-          'unexpected-witness',
-          100,
-          true);
-      }
-    }
-
-    // Check block weight (different from block size
+    // Check block size (different from block size
     // check in non-contextual verification).
-    if (block.getWeight() > consensus.MAX_BLOCK_WEIGHT) {
+    if (block.getBaseSize() > state.maxBlockSize()) {
       throw new VerifyError(block,
         'invalid',
         'bad-blk-weight',
@@ -540,6 +492,13 @@ class Chain extends AsyncEmitter {
     if (height >= this.network.block.bip65height)
       state.flags |= Script.flags.VERIFY_CHECKLOCKTIMEVERIFY;
 
+    // UAHF is now enabled.
+    const mtp = await this.getMedianTime(prev);
+    if (mtp >= consensus.UAHF_TIME) {
+      state.flags = Script.flags.VERIFY_STRICTENC;
+      state.flags = Script.flags.VERIFY_SIGHASH_FORKID;
+    }
+
     // CHECKSEQUENCEVERIFY and median time
     // past locktimes are now usable (bip9 & bip113).
     if (await this.isActive(prev, deployments.csv)) {
@@ -548,41 +507,6 @@ class Chain extends AsyncEmitter {
       state.lockFlags |= common.lockFlags.MEDIAN_TIME_PAST;
     }
 
-    // Check the state of the segwit deployment.
-    const witness = await this.getState(prev, deployments.segwit);
-
-    // Segregrated witness (bip141) is now usable
-    // along with SCRIPT_VERIFY_NULLDUMMY (bip147).
-    if (witness === thresholdStates.ACTIVE) {
-      state.flags |= Script.flags.VERIFY_WITNESS;
-      state.flags |= Script.flags.VERIFY_NULLDUMMY;
-    }
-
-    // Segsignal is now enforced (bip91).
-    if (this.options.bip91) {
-      if (witness === thresholdStates.STARTED) {
-        if (await this.isActive(prev, deployments.segsignal))
-          state.bip91 = true;
-      }
-    }
-
-    // UASF is now enforced (bip148) (mainnet-only).
-    if (this.options.bip148 && this.network === Network.main) {
-      if (witness !== thresholdStates.LOCKED_IN
-          && witness !== thresholdStates.ACTIVE) {
-        // The BIP148 MTP check is nonsensical in
-        // that it includes the _current_ entry's
-        // timestamp. This requires some hackery,
-        // since bcoin only operates on the sane
-        // assumption that deployment checks should
-        // only ever examine the values of the
-        // previous block (necessary for mining).
-        const mtp = await this.getMedianTime(prev, time);
-        if (mtp >= 1501545600 && mtp <= 1510704000)
-          state.bip148 = true;
-      }
-    }
-
     return state;
   }
 
@@ -621,6 +545,9 @@ class Chain extends AsyncEmitter {
     if (!this.state.hasBIP148() && state.hasBIP148())
       this.logger.warning('BIP148 has been activated.');
 
+    if (!this.state.hasUAHF() && state.hasUAHF())
+      this.logger.warning('UAHF has been activated.');
+
     this.state = state;
   }
 
@@ -2262,38 +2189,56 @@ class Chain extends AsyncEmitter {
       return pow.bits;
     }
 
+    if ((prev.height + 1) % pow.retargetInterval === 0) {
+      // Back 2 weeks
+      const height = prev.height - (pow.retargetInterval - 1);
+      assert(height >= 0);
+
+      const first = await this.getAncestor(prev, height);
+      assert(first);
+
+      return this.retarget(prev, first);
+    }
+
     // Do not retarget
-    if ((prev.height + 1) % pow.retargetInterval !== 0) {
-      if (pow.targetReset) {
-        // Special behavior for testnet:
-        if (time > prev.time + pow.targetSpacing * 2)
-          return pow.bits;
-
-        while (prev.height !== 0
-          && prev.height % pow.retargetInterval !== 0
-          && prev.bits === pow.bits) {
-          const cache = this.getPrevCache(prev);
-
-          if (cache)
-            prev = cache;
-          else
-            prev = await this.getPrevious(prev);
-
-          assert(prev);
+    if (pow.targetReset) {
+      // Special behavior for testnet:
+      if (time > prev.time + pow.targetSpacing * 2)
+        return pow.bits;
+
+      while (prev.height !== 0
+        && prev.height % pow.retargetInterval !== 0
+        && prev.bits === pow.bits) {
+        const cache = this.getPrevCache(prev);
+
+        if (cache) {
+          prev = cache;
+          continue;
         }
+
+        prev = await this.getPrevious(prev);
+        assert(prev);
       }
-      return prev.bits;
     }
 
-    // Back 2 weeks
-    const height = prev.height - (pow.retargetInterval - 1);
-    assert(height >= 0);
+    if (prev.bits === pow.bits)
+      return prev.bits;
 
-    const first = await this.getAncestor(prev, height);
-    assert(first);
+    const prev6 = await this.getAncestor(prev, (prev.height + 1) - 7);
+    assert(prev6);
+    const mtp6 = (await this.getMedianTime(prev)) - (await this.getMedianTime(prev6));
 
-    return this.retarget(prev, first);
-  }
+    if (mtp6 < 12 * 3600)
+      return prev.bits;
+
+    const target = consensus.fromCompact(prev.bits);
+    target.iadd(target.ushrn(2));
+
+    if (target.cmp(pow.limit) > 0)
+      return pow.bits;
+
+    return consensus.toCompact(target);
+ };
 
   /**
    * Retarget. This is called when the chain height
@@ -2894,6 +2839,26 @@ class DeploymentState {
   }
 }
 
+/**
+ * Test whether UAHF is active.
+ * @returns {Boolean}
+ */
+
+DeploymentState.prototype.hasUAHF = function hasUAHF() {
+  return (this.flags & Script.flags.VERIFY_SIGHASH_FORKID) !== 0;
+};
+
+/**
+ * Test whether UAHF is active.
+ * @returns {Boolean}
+ */
+
+DeploymentState.prototype.maxBlockSize = function maxBlockSize() {
+  return this.hasUAHF()
+    ? consensus.MAX_FORK_BLOCK_SIZE
+    : consensus.MAX_BLOCK_SIZE;
+};
+
 /**
  * Orphan
  * @ignore

lib/blockchain/chaindb.js

@@ -59,7 +59,7 @@ class ChainDB {
     this.logger.info('Opening ChainDB...');
 
     await this.db.open();
-    await this.db.verify(layout.V.build(), 'chain', 5);
+    await this.db.verify(layout.V.build(), 'chain', 0x80 | 5);
 
     const state = await this.getState();
 

lib/net/common.js

@@ -142,7 +142,7 @@ exports.USER_AGENT = `/bcoin:${pkg.version}/`;
  * @default
  */
 
-exports.MAX_MESSAGE = 4 * 1000 * 1000;
+exports.MAX_MESSAGE = 8 * 1000 * 1000;
 
 /**
  * Amount of time to ban misbheaving peers.