{'error': 'SubmitTransaction: Problem processing transaction: VerifyAndBroadcastTransaction: Problem validating txn: ValidateTransaction: Problem validating transaction: : ConnectTransaction: : _connectSubmitPost: : _connectBasicTransfer: Problem verifying txn signature: : _verifySignature: high-S deteceted: RuleErrorTxnSigHasHighS'}

[nheffelman]

I'm getting this intermittently when submitting a transaction from a python app built with desopy.
I'm using the actual seedhex and public Key
Can anyone explain why or help out?

[starykolarz]

If desopy is what I think it is - add this:

if bytes.fromhex(hexify(s))[0] >= 0x80:
s = n - s

before the line:
signature = to_DER(hexify(r), hexify(s))

Some knowledge:
https://www.advancingbitcoin.com/blog/evolution-of-the-signature-size-in-bitcoin/
https://www.rfc-editor.org/rfc/rfc6979
https://github.com/karask/python-bitcoin-utils/blob/master/bitcoinutils/keys.py

[nheffelman]

Thanks, I don't know if this exactly translates, but I will fafo with what I've got

[nheffelman]

Ok in the desopy library the code is like this

    s = inverse_mod(k, n) * (r * int(seedHex, 16) + int(s256.hex(), 16))
    s = s % n
    # Enforce low-s
    if s > n // 2:
        s = n - s
    signature = to_DER(hexify(r), hexify(s))

[lazynina]

@nheffelman - were you able to resolve the issue related to signatures?

[nheffelman]

yes, it was a problem with signing through desopy involving readerpublickey @itsaditya fixed the issue there after I brought it to his attention.

[lazynina]

@nheffelman - thanks! I'm going to go ahead and close out this issue then.