> On Jun 24, 2014, at 16:12, Gavin Andresen wrote: > > It would be silly to add a "generic stuff" field inside a container format that ALREADY has all the mechanisms necessary for forwards and backwards extensibility. I agree. It would be even sillier to start specifying container formats for random one-off "that would be kind of nice, I guess" features. How about exchange rate? Sharing links? Referral information? Any of these things are just as deserving of specification (and just as arbitrary).