Update Unblind inputs removing unnecessary m

- Update Unblind inputs removing unnecessary `m`
- Add mod at Blind & BlindSign

v0/blindsecp256k1v0.go

@@ -112,8 +112,8 @@ type Signature struct {
 }
 
 // Unblind performs the unblinding operation of the blinded signature for the
-// given message m and the UserSecretData
-func Unblind(sBlind, m *big.Int, u *UserSecretData) *Signature {
+// given and the UserSecretData
+func Unblind(sBlind *big.Int, u *UserSecretData) *Signature {
 	// s = b^-1 s' + c
 	binv := new(big.Int).ModInverse(u.B, blindsecp256k1.N)
 	bs := new(big.Int).Mul(binv, sBlind)

v0/blindsecp256k1v0_test.go

@@ -24,7 +24,7 @@ func TestFlow(t *testing.T) {
 	sBlind := sk.BlindSign(msgBlinded, k)
 
 	// user: unblinds the blinded signature
-	sig := Unblind(sBlind, msg, userSecretData)
+	sig := Unblind(sBlind, userSecretData)
 
 	// signature can be verified with signer PublicKey (Q)
 	verified := Verify(msg, sig, signerPubK)