Fix coin count and value statistics

lib/blockchain/chaindb.js

@@ -1538,6 +1538,35 @@ class ChainDB {
       return undefined;
 
     // Update chain state value.
+    this.updateChainState(entry, block, view);
+
+    // Commit new coin state.
+    this.saveView(view);
+
+    // Write undo coins (if there are any).
+    if (!view.undo.isEmpty())
+      await this.blocks.writeUndo(hash, view.undo.commit());
+
+    // Prune height-288 if pruning is enabled.
+    return this.pruneBlock(entry);
+  }
+
+  /**
+   * Update chain state with coins.
+   * @param {ChainEntry} entry
+   * @param {Block} block
+   * @param {CoinView} view
+   */
+
+  updateChainState(entry, block, view) {
+    const hash = this.network.bip30[entry.height];
+
+    // Blocks 91842 and 91880 created duplicate
+    // txids and should not increment or decrement
+    // the statistics.
+    if (hash && hash.equals(entry.hash))
+      return;
+
     for (let i = 0; i < block.txs.length; i++) {
       const tx = block.txs[i];
 
@@ -1553,16 +1582,6 @@ class ChainDB {
         this.pending.add(output);
       }
     }
-
-    // Commit new coin state.
-    this.saveView(view);
-
-    // Write undo coins (if there are any).
-    if (!view.undo.isEmpty())
-      await this.blocks.writeUndo(hash, view.undo.commit());
-
-    // Prune height-288 if pruning is enabled.
-    return this.pruneBlock(entry);
   }
 
   /**