Ensure DHT protocol ID matches Starknet spec

Use dht.V1ProtocolOverride to set exact protocol ID format for DHT.
Add test to verify protocol ID format for different networks:
- /starknet/kad/SN_SEPOLIA/1.0.0 for Sepolia
- /starknet/kad/SN_MAIN/1.0.0 for Mainnet

The change ensures that DHT protocol IDs strictly follow Starknet
specification without additional libp2p prefixes or suffixes.

p2p/p2p.go

@@ -143,7 +143,7 @@ func NewWithHost(p2phost host.Host, peers string, feederNode bool, bc *blockchai
 		}
 	}
 
-	p2pdht, err := makeDHT(p2phost, peersAddrInfoS)
+	p2pdht, err := MakeDHT(p2phost, peersAddrInfoS, snNetwork.L2ChainID)
 	if err != nil {
 		return nil, err
 	}
@@ -165,9 +165,10 @@ func NewWithHost(p2phost host.Host, peers string, feederNode bool, bc *blockchai
 	return s, nil
 }
 
-func makeDHT(p2phost host.Host, addrInfos []peer.AddrInfo) (*dht.IpfsDHT, error) {
+func MakeDHT(p2phost host.Host, addrInfos []peer.AddrInfo, chainID string) (*dht.IpfsDHT, error) {
+	protocolID := starknet.DHTPID(chainID)
 	return dht.New(context.Background(), p2phost,
-		dht.ProtocolPrefix(starknet.Prefix),
+		dht.V1ProtocolOverride(protocolID),
 		dht.BootstrapPeers(addrInfos...),
 		dht.RoutingTableRefreshPeriod(routingTableRefreshPeriod),
 		dht.Mode(dht.ModeServer),

p2p/p2p_test.go

@@ -17,6 +17,7 @@ import (
 	"github.com/libp2p/go-libp2p/core/protocol"
 	mocknet "github.com/libp2p/go-libp2p/p2p/net/mock"
 	"github.com/multiformats/go-multiaddr"
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
@@ -206,3 +207,36 @@ func TestLoadAndPersistPeers(t *testing.T) {
 	)
 	require.NoError(t, err)
 }
+
+func TestMakeDHTProtocolName(t *testing.T) {
+	net, err := mocknet.FullMeshLinked(1)
+	require.NoError(t, err)
+	testHost := net.Hosts()[0]
+
+	testCases := []struct {
+		name     string
+		network  *utils.Network
+		expected string
+	}{
+		{
+			name:     "sepolia network",
+			network:  &utils.Sepolia,
+			expected: "/starknet/kad/SN_SEPOLIA/1.0.0",
+		},
+		{
+			name:     "mainnet network",
+			network:  &utils.Mainnet,
+			expected: "/starknet/kad/SN_MAIN/1.0.0",
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			dht, err := p2p.MakeDHT(testHost, nil, tc.network.L2ChainID)
+			require.NoError(t, err)
+
+			protocols := dht.Host().Mux().Protocols()
+			assert.Contains(t, protocols, protocol.ID(tc.expected), "protocol list: %v", protocols)
+		})
+	}
+}

p2p/starknet/ids.go

@@ -25,3 +25,7 @@ func ClassesPID() protocol.ID {
 func StateDiffPID() protocol.ID {
 	return Prefix + "/state_diffs/0.1.0-rc.0"
 }
+
+func DHTPID(chainID string) protocol.ID {
+	return protocol.ID(Prefix + "/kad/" + chainID + "/1.0.0")
+}