I think the idea of just stealing from you is the market for cryptocurrency payments would be a start.
I'm going to make a demo of the project. I think they are this would give a clearer idea to the points I mentioned. For the truth it is difficult to expose an idea only in text. Visually, it would be better.
Albert Einstein — 'If you can't explain it to a six year old, you don't understand it yourself.' - I see this applying here.
Hmm. You sure you understand what you're trying to build here?
Making a market like amazon will cost billions of dollars, and there already are plenty of alternatives/routes available to pay with crypto on Amazon (Purse) and plenty P2P marketplaces (which suck because they obviously just don't compare to amazon/ebay. see Openbazaar.)
On the contrary, great financing is not required. I think that after you have a draft or a demo of the project you could better the idea itself. But I see it as a great opportunity to adapt to a more the cryptocurrencies that until now ebay or amazon or alibaba have not done.
If not for the huge inventory of items you need to have, you, as an alternative, need to have lots of P2P sellers, and to attract those, you're going to need to spend a lot of money in advertising.
I really don't see any way to turn this into a success without capital.