>   Yep, we've got it in our pockets in a physical state, but it really 
> isn't real in the sense of world-wide governments.

If you look on an English bank note, it says "I promise to pay the bearer on 
demand the sum of xxx pounds".  It basically comes from the fact that in the 
old days you would drop off 100 pounds of gold at the bank and they'd give 
you a 100 pound "note" that entitled you to the gold.  Then people realised 
it's easier to just trade these notes rather than actual gold.

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