diff --git a/merlin.go b/merlin.go
index bdafa80..3771119 100644
--- a/merlin.go
+++ b/merlin.go
@@ -2,7 +2,6 @@ package merlin
 
 import (
 	"encoding/binary"
-	"fmt"
 
 	"github.com/mimoo/StrobeGo/strobe"
 )
@@ -21,8 +20,6 @@ func NewTranscript(appLabel string) *Transcript {
 		s: strobe.InitStrobe(merlinProtocolLabel, 128),
 	}
 
-	fmt.Printf("Initialize STROBE-128(%x)\n", merlinProtocolLabel)
-
 	t.AppendMessage([]byte(domainSeparatorLabel), []byte(appLabel))
 	return &t
 }
@@ -34,15 +31,12 @@ func (t *Transcript) AppendMessage(label, message []byte) {
 	sizeBuffer := make([]byte, 4)
 	binary.LittleEndian.PutUint32(sizeBuffer[0:], uint32(len(message)))
 
-	fmt.Printf("meta-AD : %x || LE32(%d)\t# b\"%s\"\n", label, len(message), label)
-
 	// The StrobeGo API does not support continuation operations,
 	// so we have to pass the label and length as a single buffer.
 	// Otherwise it will record two meta-AD operations instead of one.
 	labelSize := append(label, sizeBuffer...)
 	t.s.AD(true, labelSize)
 
-	fmt.Printf("AD : %x\t# b\"%s\"\n", message, message)
 	t.s.AD(false, message)
 }
 
@@ -54,8 +48,6 @@ func (t *Transcript) ExtractBytes(label []byte, outLen int) []byte {
 	sizeBuffer := make([]byte, 4)
 	binary.LittleEndian.PutUint32(sizeBuffer[0:], uint32(outLen))
 
-	fmt.Printf("meta-AD : %x || LE32(%d)\t# b\"%s\"\n", label, outLen, label)
-
 	// The StrobeGo API does not support continuation operations,
 	// so we have to pass the label and length as a single buffer.
 	// Otherwise it will record two meta-AD operations instead of one.
@@ -64,6 +56,5 @@ func (t *Transcript) ExtractBytes(label []byte, outLen int) []byte {
 
 	// a PRF call directly to the output buffer would be better
 	outBytes := t.s.PRF(outLen)
-	fmt.Printf("PRF : %x\n", outBytes)
 	return outBytes
 }