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
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).
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).