watchtower/multi: thread ChainHash to server

watchtower/config.go

@@ -6,6 +6,7 @@ import (
 	"time"
 
 	"github.com/btcsuite/btcd/btcec"
+	"github.com/btcsuite/btcd/chaincfg/chainhash"
 	"github.com/btcsuite/btcd/wire"
 	"github.com/btcsuite/btcutil"
 	"github.com/lightningnetwork/lnd/tor"
@@ -35,6 +36,11 @@ var (
 // All nil-able elements with the Config must be set in order for the Watchtower
 // to function properly.
 type Config struct {
+	// ChainHash identifies the chain that the watchtower will be monitoring
+	// for breaches and that will be advertised in the server's Init message
+	// to inbound clients.
+	ChainHash chainhash.Hash
+
 	// BlockFetcher supports the ability to fetch blocks from the network by
 	// hash.
 	BlockFetcher lookout.BlockFetcher

watchtower/standalone.go

@@ -78,6 +78,7 @@ func New(cfg *Config) (*Standalone, error) {
 
 	// Initialize the server with its required resources.
 	server, err := wtserver.New(&wtserver.Config{
+		ChainHash:    cfg.ChainHash,
 		DB:           cfg.DB,
 		NodePrivKey:  cfg.NodePrivKey,
 		Listeners:    listeners,