Optimize blockchain overview

core/Blockchain.go

@@ -76,6 +76,7 @@ func (bc *Blockchain) IsValid() bool {
 // JSONBlockchain is needed, because the hash of each block is calculated dynamically, and therefore is not stored in the `Block` struct
 type JSONBlockchain struct {
 	Blocks              []JSONBlock
+	Blockcount          int
 	PendingTransactions []Transaction
 }
 
@@ -86,6 +87,7 @@ func (bc *Blockchain) AsJSON() JSONBlockchain {
 	for _, block := range bc.Blocks {
 		jsonChain.Blocks = append(jsonChain.Blocks, block.AsJSON())
 	}
+	jsonChain.Blockcount = len(jsonChain.Blocks)
 
 	return jsonChain
 }

server/webserver.go

@@ -41,7 +41,7 @@ func handleError(err error, w http.ResponseWriter, r *http.Request) {
 }
 
 func handleListBlocks(w http.ResponseWriter, r *http.Request) {
-	json.NewEncoder(w).Encode(blockchain.AsJSON().Blocks)
+	json.NewEncoder(w).Encode(blockchain.AsJSON())
 }
 
 func handleAddTransaction(w http.ResponseWriter, r *http.Request) {