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So if we were running on DPoS like the STEEM blockchain and the only rewards were for research do you think the coin would be valuable? Or would people just sell everything they earn?

Sure - the real value that can drive GRC in the long run is allowing project admins to buy, or encourage, research on their project. This is why competitors like GNT, SPARC etc have such a relatively high value despite having no functional product.

I would love to see Gridcoin ported to Graphene.

I think @cm-steem has mentioned in the past. Projects do not want to pay GRC to the volunteers because of tax/legal concerns.

Maybe a third-party donation site could work. A one where people can donate any crypto to a project and it automatically gets converted to GRC and rained on the researchers.

I too, would like to see either Gridcoin or a new BOINC coin on Graphene. The more I read about PoS, it seems to be much less secure than PoW of DPoS.

That is a fair concern. The projects could just rain the GRC though, which would probably not classify as paying the crunchers? I am guessing here, and the law would probably be different depending on where in the world this were to happen...

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