ZRcoin is a cryptocurrency backed by a material called zirconium dioxide that is still in low demand, but is expected to increase in the future. It is based on the waves blockchain and can be traded in 2 exchages, but the trading volume is still very poor. Investors of this cryptocurrency can even exchange it for the physical material if they wish or they can receive their profits at any time they want.
The project seems very tentative, but it has not had much progress, and there is not much information from the company about the future of the project, that is why it is listed in a very low ranking and has not had much reliability.