A wide variety of valuable assets can be used. Common examples include precious metals (gold bars, silver, etc.), precious stones (diamonds, gemstones), high-value collectibles or artwork, certain financial instruments or certificates, and even some forms of real estate titles or commodity ownership documents (though those can be trickier). Essentially, the asset should be something with a clear market value that can be securely stored. We have the capability to hold physical assets in secure vaults (with insurance) and to hold financial instruments in secure accounts. If you’re not sure, you can ask us about a specific asset – we’ll let you know if it’s something we can custodize and issue an SKR against. The asset will typically need to be appraised and authenticated. We then keep it in safekeeping and issue you the SKR which details the asset. Note that you remain the owner; the SKR is not a transfer of ownership, just evidence of custody and an agreement that we’ll release the asset only per your instructions (or to a lender if you’ve pledged it, with your consent).