The Swift leder has two forms of liquidity

 Pure digital cash, bearer digits with guaranteed security up to a tiime out.

And money on account at one of the Swift S/L pits. Thus all cash leaving or entering accounts  has been ju prior or post, marked to market. The sequence for pure cash entering my account. First it is verified, ten sent out for validation in the Swift hierarchy between me and he source. Then it goes on trading account, that matter is mostly settled as mark to market is automatic. Beyond that unless you investigate racketeering and counterfeit proofing.  We define unprovabloe contracts entering the system as a counterfeit.