Bridge for sale
I'm going to run a computer for a while and produce some strings of numbers which I would like you to pay me for now so that we can run more computers for longer and take more money off other people. At some point in the future these strings of numbers and the systems producing them may or may not be something that other people are willing to pay you more [money] for than you originally handed over to me.
The general tech in this area is interesting - the financial side a bit more hit and miss. ICOs are and always have been a way of raising venture capital without all the silly due diligence.