What Elements Could Be Contained in Paper Bullion Bank Bills ?

Germanium based on its price.
Rhodium based on price and alloy value
Palladium based on alloy value
Silver based on money association.
Neodymium based on industrial value (magnets)
Terbium based on price and industrial value (special magnetic properties)
Erbium price
Tantalum price
Tungsten rocket nozzles
Rhenium Electrodes and fan blades in jets
Iridium extreme high price $161,000/kilo
Platinum price and money association
Gold price and money association

Paper Bullion Bank Bills tell you in grams how much element you are getting in the paper of that bank bill, and that bank bill is authenticated by Photon-DSP (the most secure authentication method known to man).
Grams will range down to 0.1 grams and up to 30 grams in a bank bill — in the paper of that bank bill.

Paper Bullion Bank Bills are the Promise AND the Fulfillment of that Promise — all in the same bank bill.

They are not a mere promise like fiat paper money, which always turns out fake. Basically fiat money just tells you to go chase yourself and find your value matter somewhere somehow (which always turns out to be nowhere, no how)

If a Paper Bullion Bank Bill reads “authentic” in the Photon-DSP machine, the bank will give you your metal as a round, or a bar. You don’t have to get your metal out of the bank bill. But if you have no time to deal with the bank, you can just burn off the paper, and have your metal in your own crucible.