This could really rock! How great would it be to have the stability of real gold and silver as the core of savings, with the flexibility of crypto for transactions.

Two things that will need to be figured out:

1. Precious Metals are currently manipulated in the futures markets, keeping their price much lower than it ought to be based on inflation of rent, education, healthcare, etc.
2. In the same way that people want to control their own private keys for crypto, will people trust that an asset that is backed by PMs really represents those PMs in a vault somewhere? There is a lot of "paper gold" out there right now that isn't backed by actual gold.