Since the beginning of cryptocurrency we have seen many precious metal crypto project. With my little knowledge i don't know any successful one. All precious metal crypto projects disappeared after funding phase. Is there any successful precious metal crypto and traded?
May I know why you look for such bullion based cryptos? Do you still believe such cryptos are really having sufficient reserve of precious metals for circulating supply? In my eyes, they are just using fancy things to lure investors because working on billions in million dollars levels is not a thing of a dev team but government officials' level of work. So, do not get trapped yourself by fancy thing; if a company is capable of doing with bullion for millions then they are not probably doing here on this forum as their next targets would be on billion dollar things like how Elon Musk is expanding his business.
The reason for that is I think you make matters complex when pairing digital currency to physical assets. I don't think it will work.
I could not get on what kind of complexity you are referring to. Because, pairing is all about what we already to with gold prices or silver prices and I do not think anything got hidden in between just because of you are dealing with metals. One most probable reason must be the actual holding of physical assets.
altcoin can never be back up by gold or silver since its not tangible and can lose value in an instant.
You mean only stable valued things alone can be backed for altcoins? I do not know anything such is existing at all; because even fiats too do fluctuate. Gold or silver may lose value in an instant and may gain value at the same time frame.