Well I think zrcoin is itself a commonity. Not physical though, and value of it is mostly made-up but in the terms of how it's minted and distributed - this piece of shit can be viewed as a commodity. No other commodities, not even physical ones, will be pegged to the value of zrcoin or have an impact on the valuation of its blockchain. This will tank like a rock in a marsh.
Commodity-backed tokens
ZrCoin will create an entirely new kind of financial instrument: an option for a commodity, hosted on the Waves blockchain.
Options are widely used in industry, and in essence are quite straightforward. They offer the opportunity to buy or sell a particular commodity or security at a given price, at some point in the future. For example, a farmer might purchase an option to sell next summer’s wheat at the current market price, as a form of insurance against the price falling in the meantime. (If the price rises, he does not have to exercise his option.)
Options exist for all kinds of commodities, from wheat to gold, and for stocks and shares. Whilst they are used by industry to ensure the acquisition of raw materials at a known price, there is also an active secondary market for them. Traders use them as speculative vehicles.
ZrCoin is doing something similar. We are selling tokens that represent the option to take possession of 1kg synthetic ZrO2 — the product we will manufacture for industrial use. Once we are up and running, this product will sell for $2,800 per tonne, so each ZrCoin has a theoretical value of $2.80. We will sell the options at a discount to this at ICO, starting at $1.40.
Read more details here
https://medium.com/zrcoin/the-decentralisation-of-the-global-economy-starts-here-1d77f234d468