1. A method of ensuring data integrity on a dispersed data storage network comprising the steps of: i) calculating a first checksum for a data segment to be written to said dispersed data storage network; ii) appending said first checksum to said data segment, thereby forming a certified data segment; iii) slicing said certified data segment, thereby forming a plurality of data slices; iv) calculating a plurality of second checksums for said plurality of data slices; v) appending said plurality of second checksums to said plurality of data slices, so that the appropriate second checksum is appended to the appropriate data slice, thereby forming a plurality of certified data slices; vi) transmitting said certified data slices to a plurality of slice servers, so that each certified data slice is stored on a separate slice server; and vii) storing said certified data slices on said slice servers, so that each certified data slice is stored on a separate slice server.