nothing is 100% backed.
stable coins are 99% backed by a 'promised' reserve of fiat peg. but recently a stable coin has failed to prove its reserve backing and crashed
gold is not purely backed by its "shine" its actually backed by the labour and cost of its creation. but this backing cost is also not 100%
bitcoin also is backed by its creation cost, but this also is not 100% of the variable price
lets make this very simple.
the very cheapest cost to acquire/create bitcoin is its backed value. the "no go" zone no one wants or can go below to get bitcoin because no one on the planet can mine or sell bitcoin for less
finding the cheapest mining/acquisition cost on the entire planet is the backed value.
right now bitcoin is backed by about $15k value because no one on the planet can get bitcoin for less by any means.
gold is backed by the cheapest mining rate on the planet hich is about $900
ethereum is PoS which if you calculate out the validators calculates to a $40 backing
fiat is not backed by common utility its backed by things like min wage
but min wage is not the same as cost of living. yep when the min wage vs cost of living spread increases, its called inflations
what you can do is create some visual display
take an assets max price it ever achieved.
take its cheapest acquisition price right now
take the look at the price
black is the no go zone price wont go below
green yellow red is the speculative risk window where the price will wiggle in-between
the [] border is the current price in its window
as you can see gold max ATH was about $2.075k and its current price is about $1.66k but the lowest price it can possibly achieve is $900
meaning that its price in its window puts it in the yellow. meaning it can fall alot
Ethereums cheapest acquisition cost is about $40 the highest it ever achieved is $4.8k. so although ethereum is in the green it can still fall by alot
bitcoins max was about $75k. and is currently priced at $19.6k but its lowest possible cost to acquire is at $15k meaning its in a very good value spot where it cant go down much more
from this you can also work out how much of the PRICE is backed by the lowest cost acquisition backed value no one dares sell below
EG gold is 54% backed
EG bitcoin is 76% backed
EG ethereum is 3% backed
you then learn things like when bitcoins price was at the ATH it was only value backed by its underlying cost of about 20% which was also when it was in the red, so not a good value time to have bought bitcoin
but now the price is at $19.6k its very good value backed
better than some other assets