add --silent global option to remove the stderr logs.

main.go

@@ -19,6 +19,19 @@ var app = &cli.App{
 		encode,
 		verify,
 	},
+	Flags: []cli.Flag{
+		&cli.BoolFlag{
+			Name:    "silent",
+			Usage:   "do not print logs and info messages to stderr",
+			Aliases: []string{"s"},
+			Action: func(ctx *cli.Context, b bool) error {
+				if b {
+					log = func(msg string, args ...any) {}
+				}
+				return nil
+			},
+		},
+	},
 }
 
 func main() {