A method, system, and computer program product for simultaneous multi-channel upload of a file to one or more servers while ensuring data integrity. A validation scheme employs hashes to allow segments of the data file to be separately validated. Thus, if the upload process is interrupted or otherwise corrupted, segments of previously transferred data which have been transferred correctly may be validated, eliminating the need for re-transmission of that correctly transferred data. Preferably, a grid broker may be incorporated, allowing simultaneous multi-channel upload of data in a grid computing environment.