[lifeisstillgood]

That seems odd - if A visits will road and buys drugs off B then A owes B one bitcoin - that is a human level contract that is clearly understood. A balance sheet accounting of this transaction would as easily be In bitcoins as dollars (A has a liability of 1 bitcoin, B has an asset)

As long as B wishes to denominate their accounts in bitcoins this is quite reasonable.

Or am I missing something ?

(Interestingly the Indian mathematician who invented negative numbers did so using accounts and debt as an example (bhagravita? 500AD)

[kaonashi]

>Or am I missing something ?

Banking.

[lifeisstillgood]

I don't understand - why is banking meaning that I owe someone 100 bitcoins a problem? It's an unstable currency yes but the same can be said for Zimbabwean dollar

[kaonashi]

In your case, the transaction is barter, a transfer of one non-financial asset for another.

If you have a contract to provide 100 BTC, then that contract would be money, denominated in BTC (not the BTC themselves). It would exist on one balance sheet as an asset, and on another as a liability (at the same time).