> Ian pointed out some errors in the BIP21 spec. What's the process for amending the BIP? Do we need to create a new one and mark the old one as replaced, or can we just fix it in place given the relatively exotic nature of most of the issues?

Those all sound like bugs in the BIP; I think they should just be fixed, I don't think we need a new BIP.

I vote for a new meta-data item in the BIP header:

  Corrected: <date>

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Gavin Andresen