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

Pieter Wuille pieter.wuille at gmail.com
Sun Apr 7 15:34:22 UTC 2013

(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.


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