A mixed checksum injection system includes a memory, at least one processor in communication with the memory, a data repository including content, and a server including a CRMS. The CRMS executes on the at least one processor to generate a plurality of checksum values for the content. The plurality of checksum values includes a first checksum value generated using a first checksum function and a second checksum value generated using a second checksum function. The CRMS receives a first request for the content for a first platform, and responsive to receiving the first request, renders first metadata. The CRMS injects the first checksum value and an identifier of the first checksum function into the first metadata. Then, the CRMS publishes the content and the associated first metadata including the injected first checksum value and the identifier of the first checksum function.