diff --git a/sign.go b/sign.go
index 746f407..676de68 100644
--- a/sign.go
+++ b/sign.go
@@ -7,7 +7,6 @@ import (
 	"encoding/base64"
 	"encoding/hex"
 	"errors"
-	"fmt"
 	"github.com/ugorji/go/codec"
 	"hash/crc64"
 	"strings"
@@ -51,21 +50,13 @@ func (tc TokenCoder) SeedHex() string {
 	return hex.EncodeToString(tc.Seed())
 }
 
-func NewTokenCoder(seed []byte, pubKeys ...[]byte) (tc TokenCoder, err error) {
-	tc.pubKeys = make([]ed25519.PublicKey, len(pubKeys)+1, len(pubKeys)+1)
-	if len(seed) == 0 {
-		seed = make([]byte, ed25519.SeedSize, ed25519.SeedSize)
-		_, err = rand.Read(seed)
-		if err != nil {
-			return
-		}
-	}
-
+func NewTokenCoderWithSeed(seed []byte, pubKeys ...[]byte) (tc TokenCoder, err error) {
 	if len(seed) != ed25519.SeedSize {
 		err = errors.New("Incorrect seed size")
 		return
 	}
 
+	tc.pubKeys = make([]ed25519.PublicKey, len(pubKeys)+1, len(pubKeys)+1)
 	tc.privKey = ed25519.NewKeyFromSeed(seed)
 	tc.pubKeys[len(pubKeys)] = tc.privKey.Public().(ed25519.PublicKey)
 
@@ -80,7 +71,16 @@ func NewTokenCoder(seed []byte, pubKeys ...[]byte) (tc TokenCoder, err error) {
 	return
 }
 
-func NewTokenCoderHex(seed string, pubKeys ...string) (tc TokenCoder, err error) {
+func NewTokenCoder(pubKeys ...[]byte) (tc TokenCoder, err error) {
+	seed := make([]byte, ed25519.SeedSize, ed25519.SeedSize)
+	_, err = rand.Read(seed)
+	if err != nil {
+		return
+	}
+	return NewTokenCoderWithSeed(seed, pubKeys...)
+}
+
+func NewTokenCoderHexWithSeed(seed string, pubKeys ...string) (tc TokenCoder, err error) {
 	var rawSeed []byte
 	rawPubKeys := make([][]byte, len(pubKeys), len(pubKeys))
 	rawSeed, err = hex.DecodeString(seed)
@@ -93,7 +93,18 @@ func NewTokenCoderHex(seed string, pubKeys ...string) (tc TokenCoder, err error)
 			return
 		}
 	}
-	return NewTokenCoder(rawSeed, rawPubKeys...)
+	return NewTokenCoderWithSeed(rawSeed, rawPubKeys...)
+}
+
+func NewTokenCoderHex(pubKeys ...string) (tc TokenCoder, err error) {
+	rawPubKeys := make([][]byte, len(pubKeys), len(pubKeys))
+	for pos, pubKey := range pubKeys {
+		rawPubKeys[pos], err = hex.DecodeString(pubKey)
+		if err != nil {
+			return
+		}
+	}
+	return NewTokenCoder(rawPubKeys...)
 }
 
 func trim(r rune) bool {