[Bitcoin-development] Who is creating non-DER signatures?

Mike Hearn mike at plan99.net
Sun Apr 7 16:01:13 UTC 2013

It'd help to know how the signatures are invalid.

On Sun, Apr 7, 2013 at 5:34 PM, Pieter Wuille <pieter.wuille at gmail.com>wrote:

> (cross-post from bitcointalk.org)
> Hello all,
> as some may know, Bitcoin uses DER-encoded signatures in its transactions.
> However, OpenSSL (which is used to verify them) accepts more than just the
> strict DER specification (it allows negative numbers, extra zero padding,
> extra bytes at the end, and perhaps more). As we don't like the de-facto
> specification of the Bitcoin block validity rules to depend on OpenSSL,
> we're trying to introduce a rule to make such non-standard signatures
> invalid. Obviously, that can't be done as long as any significant amount of
> clients on the network is creating these.
> I've monitored all transactions the past weeks (1.4M transactions), and it
> seems 9641 of them contain at least one non-standard signature. See
> https://bitcointalk.org/index.php?topic=169620.0 for a list of the top
> addresses that had coins used as inputs in such transactions. If you
> recognize any of these addresses, or have an idea of who owns them or what
> software they are using, please let me know.
> Thanks!
> --
> Pieter
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