use log() function instead of fmt.Fprintf(os.Stderr) in some places.

bunker.go

@@ -222,7 +222,7 @@ var bunker = &cli.Command{
 				select {
 				case <-ctx.Done():
 				case <-time.After(time.Minute * 5):
-					fmt.Fprintf(os.Stderr, "\n")
+					log("\n")
 					printBunkerInfo()
 				}
 			}()

helpers_key.go

@@ -68,7 +68,7 @@ func gatherSecretKeyOrBunkerFromArguments(ctx context.Context, c *cli.Command) (
 			clientKey = nostr.GeneratePrivateKey()
 		}
 		bunker, err := nip46.ConnectBunker(ctx, clientKey, bunkerURL, nil, func(s string) {
-			fmt.Fprintf(color.Error, color.CyanString("[nip46]: open the following URL: %s"), s)
+			log(color.CyanString("[nip46]: open the following URL: %s"), s)
 		})
 		return "", bunker, err
 	}

key.go

@@ -5,7 +5,6 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
-	"os"
 	"strings"
 
 	"github.com/btcsuite/btcd/btcec/v2"
@@ -188,7 +187,7 @@ However, if the intent is to check if two existing Nostr pubkeys match a given c
 				for i, prefix := range []byte{0x02, 0x03} {
 					pubk, err := btcec.ParsePubKey(append([]byte{prefix}, keyb...))
 					if err != nil {
-						fmt.Fprintf(os.Stderr, "error parsing key %s: %s", keyhex, err)
+						log("error parsing key %s: %s", keyhex, err)
 						continue
 					}
 					group[i] = pubk
@@ -229,7 +228,7 @@ However, if the intent is to check if two existing Nostr pubkeys match a given c
 
 				agg, _, _, err := musig2.AggregateKeys(combining, true)
 				if err != nil {
-					fmt.Fprintf(os.Stderr, "error aggregating: %s", err)
+					log("error aggregating: %s", err)
 					return
 				}
 

musig2.go

@@ -6,7 +6,6 @@ import (
 	"encoding/base64"
 	"encoding/hex"
 	"fmt"
-	"os"
 	"strconv"
 	"strings"
 
@@ -135,8 +134,8 @@ func performMusig(
 		if err != nil {
 			return false, err
 		}
-		fmt.Fprintf(os.Stderr, "the following code should be saved secretly until the next step an included with --musig-nonce-secret:\n")
+		log("the following code should be saved secretly until the next step an included with --musig-nonce-secret:\n")
-		fmt.Fprintf(os.Stderr, "%s\n\n", base64.StdEncoding.EncodeToString(nonce.SecNonce[:]))
+		log("%s\n\n", base64.StdEncoding.EncodeToString(nonce.SecNonce[:]))
 
 		knownNonces = append(knownNonces, nonce.PubNonce)
 		printPublicCommandForNextPeer(evt, numSigners, knownSigners, knownNonces, nil, false)
@@ -149,7 +148,7 @@ func performMusig(
 	} else {
 		evt.PubKey = hex.EncodeToString(comb.SerializeCompressed()[1:])
 		evt.ID = evt.GetID()
-		fmt.Fprintf(os.Stderr, "combined key: %x\n\n", comb.SerializeCompressed())
+		log("combined key: %x\n\n", comb.SerializeCompressed())
 	}
 
 	// we have all the signers, which means we must also have all the nonces
@@ -244,7 +243,7 @@ func printPublicCommandForNextPeer(
 		maybeNonceSecret = " --musig-nonce-secret '<insert-nonce-secret>'"
 	}
 
-	fmt.Fprintf(os.Stderr, "the next signer and they should call this on their side:\nnak event --sec <insert-secret-key> --musig %d %s%s%s%s%s\n",
+	log("the next signer and they should call this on their side:\nnak event --sec <insert-secret-key> --musig %d %s%s%s%s%s\n",
 		numSigners,
 		eventToCliArgs(evt),
 		signersToCliArgs(knownSigners),