[Bitcoin-development] On OP_RETURN in upcoming 0.9 release

Gavin Andresen gavinandresen at gmail.com
Mon Feb 24 16:45:16 UTC 2014

40 bytes is small enough to never require an OP_PUSHDATA1, too, which will
make writing the OP_RETURN-as-standard BIP simpler.

On Mon, Feb 24, 2014 at 11:39 AM, Wladimir <laanwj at gmail.com> wrote:

> On Mon, Feb 24, 2014 at 5:03 PM, Jeff Garzik <jgarzik at bitpay.com> wrote:
>> A common IRC proposal seems to lean towards reducing that from 80.
>> I'll leave it to the crowd to argue about size from there. I do think
>> regular transactions should have the ability to include some metadata.
> I'd be in favor of bringing it down to 40 for 0.9.
> That'd be enough for <8 byte header/identifier><32 byte hash>.
> 80, as the standard line length, is almost asking for "insert your
> graffiti message here". I also see no need for 64 bytes hashes such as
> SHA512 in the context of bitcoin, as that only offers 256-bit security (at
> most) in the first place.
> And if this is not abused, these kind of transactions become popular, and
> more space is really needed, the limit can always be increased in a future
> version.
> Wladimir

Gavin Andresen
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