[Sir_Cmpwn]

We make incremental change. Adoption starts slow, then some middle players pick it up, one big player grabs it and then it proliferates. I've been working on a mail client for some time and I have plans to write a mail server, and both will have first class, opt-out support for hashcash.

[tscs37]

That sounds like a lovely pipe-dream.

I severely doubt any big player picks it up on grounds of it being cheaper and less energy intensive to simply greylist or blacklist.