blockchain sandbox: UTXO chain, p2p mining, attacker node

p2p/peer.go

@@ -0,0 +1,12 @@
+package p2p
+
+// Peer is the interface that any network participant must implement.
+// Both honest nodes and attackers implement this — the network doesn't know the difference.
+type Peer interface {
+	// Receive delivers a message to this peer (network layer).
+	Receive(msg Msg)
+	// ReceiveSync delivers a sync message (block sync protocol).
+	ReceiveSync(msg Msg)
+	// ShortID returns a short identifier for logging.
+	ShortID() string
+}