blockchain sandbox: UTXO chain, p2p mining, attacker node

config/config.go

@@ -0,0 +1,40 @@
+package config
+
+import "time"
+
+var Default = Config{
+	Chain: ChainConfig{
+		Difficulty:   4,
+		MiningReward: 10,
+	},
+	P2P: P2PConfig{
+		OutboundPeers: 3,  // Bitcoin: 8
+		MaxPeers:      20, // Bitcoin: 125
+	},
+	Sim: SimConfig{
+		NumNodes:  30,
+		HashDelay: 5 * time.Millisecond,
+	},
+}
+
+type ChainConfig struct {
+	Difficulty   int
+	MiningReward int
+}
+
+type P2PConfig struct {
+	OutboundPeers int
+	MaxPeers      int
+	NetDelay      time.Duration
+}
+
+type SimConfig struct {
+	NumNodes  int
+	HashDelay time.Duration
+}
+
+type Config struct {
+	Chain ChainConfig
+	P2P   P2PConfig
+	Sim   SimConfig
+}