<p>They are still just non-standard.</p>

CC BY-SA 4.0
2021-05-19T14:19:54.873Z
2021-05-19T14:19:54.873Z
Pieter Wuille
<p>I must have looked that up five times by now, but did segwit actually forbid high-s ECDSA signatures in witnesses, esp. in standard single-sig constructions such as P2SH-P2WPKH or P2WPKH? Or are high-s signatures still only non-standard even in segwit inputs?</p>
<p><sub>(I'm aware that the transaction malleability problem due to low-s/high-s is mitigated by moving the signature into the witness, that's not my question.)</sub></p>

<segregated-witness><signature><ecdsa>
Are high-s ECDSA signatures forbidden in segwit witnesses?
Murch
# Are high-s ECDSA signatures forbidden in segwit witnesses?

(Asked by: username_0 on 2021-05-19)

I must have looked that up five times by now, but did segwit actually forbid high-s ECDSA signatures in witnesses, esp. in standard single-sig constructions such as P2SH-P2WPKH or P2WPKH? Or are high-s signatures still only non-standard even in segwit inputs?

(I'm aware that the transaction malleability problem due to low-s/high-s is mitigated by moving the signature into the witness, that's not my question.)

**Tags:** segregated-witness, signature, ecdsa


---

## 1 answers

### Answer by username_1 on 2021-05-19. Score: 2 | Accepted answer

They are still just non-standard.


---

