diff --git a/license/crypto.go b/license/crypto.go
index 12ad909..4687cfa 100644
--- a/license/crypto.go
+++ b/license/crypto.go
@@ -1,50 +1,47 @@
 package license
 
 import (
-    "crypto/ecdsa"
-    "crypto/elliptic"
-    "crypto/rand"
-    "crypto/sha256"
-    "crypto/x509"
-    "encoding/base64"
-    "encoding/json"
-    "encoding/pem"
-    "math/big"
-    "time"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/sha256"
+	"crypto/x509"
+	"encoding/base64"
+	"encoding/pem"
+	"math/big"
 )
 
 var (
-    privateKey *ecdsa.PrivateKey
+	privateKey *ecdsa.PrivateKey
 )
 
 func init() {
-    privateKey, _ = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	privateKey, _ = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
 }
 
 func SignPayload(payload []byte) (string, error) {
-    hash := sha256.Sum256(payload)
-    r, s, err := ecdsa.Sign(rand.Reader, privateKey, hash[:])
-    if err != nil {
-        return "", err
-    }
+	hash := sha256.Sum256(payload)
+	r, s, err := ecdsa.Sign(rand.Reader, privateKey, hash[:])
+	if err != nil {
+		return "", err
+	}
 
-    sig := append(r.Bytes(), s.Bytes()...)
-    return base64.StdEncoding.EncodeToString(sig), nil
+	sig := append(r.Bytes(), s.Bytes()...)
+	return base64.StdEncoding.EncodeToString(sig), nil
 }
 
 func VerifySignature(pubKey *ecdsa.PublicKey, payload []byte, signature string) bool {
-    sigBytes, _ := base64.StdEncoding.DecodeString(signature)
-    r := big.Int{}
-    s := big.Int{}
-    r.SetBytes(sigBytes[:len(sigBytes)/2])
-    s.SetBytes(sigBytes[len(sigBytes)/2:])
+	sigBytes, _ := base64.StdEncoding.DecodeString(signature)
+	r := big.Int{}
+	s := big.Int{}
+	r.SetBytes(sigBytes[:len(sigBytes)/2])
+	s.SetBytes(sigBytes[len(sigBytes)/2:])
 
-    hash := sha256.Sum256(payload)
-    return ecdsa.Verify(pubKey, hash[:], &r, &s)
+	hash := sha256.Sum256(payload)
+	return ecdsa.Verify(pubKey, hash[:], &r, &s)
 }
 
 func ExportPublicKeyPEM() string {
-    pubKeyBytes, _ := x509.MarshalPKIXPublicKey(&privateKey.PublicKey)
-    return string(pem.EncodeToMemory(&pem.Block{Type: "PUBLIC KEY", Bytes: pubKeyBytes}))
+	pubKeyBytes, _ := x509.MarshalPKIXPublicKey(&privateKey.PublicKey)
+	return string(pem.EncodeToMemory(&pem.Block{Type: "PUBLIC KEY", Bytes: pubKeyBytes}))
 }
-