@JellyBabiesFan
Maths
What are you on about? How can 'maths' underpin the value of something?
When I own 1btc, I know - for certain - that own 1/21m of all the bitcoin that there will ever be in existence. Maths guarantees that there will only ever be 21m bitcoin.
Those bitcoins come into existence at regular intervals (approx 10 minutes) at an emissions rate that halves approximately ever four years. Maths ensure that this happens through the application of energy (through computers).
The bitcoins cannot be duplicated once created as there is a record going back to the every first bitcoin ever mined of when the bitcoins were created and where they have gone. This is again secured by maths.
Bitcoin has value because it is finite. No-one can create any more of them, but they are infinitely divisible - you can transact with 0.000000000000000001 of a btc (or less), so even the tiniest amounts of value can be stored.Bitcoin can be transferred anywhere in the world in a matter of minutes. Again the maths of bitcoin enables this.
Compare with gold, commodity money. Gold is scarce, is created through energy, has a record of sorts (in jewellery, bullion, sovereigns etc), but is limited in its divisibility or portability.
Compare with fiat, government money. Fiat is not scarce, it can be printed at will,, it is extensively recorded, and limited in its divisibility (think of all those 1ps down the back of the sofa that are effectively worthless).
The maths of bitcoin means it can be trusted far more than any government, and that it can be retained and exchanged much more easily than any quantity of gold