In a method for executing software, a result produced from an execution of a copy of the software by a corresponding platform can be received from each of a plurality of platforms. A number of results of execution of the software can be determined. The extent to which the results match can be compared to a threshold. The matching results can be accepted as an agreed-upon output of the software when the extent to which the results match is equal to or greater than the threshold. The software can include an implementation of at least a portion of an act associated with an agreement between at least two entities.