Embodiments of the invention are directed to a system, method, or computer program product for file transmission validation and failure location identification. The invention provides a cryptographic hashing function to generate a unique hash for each block in a file being transmitted. The hash from the previous block is included along with the contents of the next block to create the hash for the next block. Similarly the hash from the previous blocks is used with the data of that block to generate the hash forming onto a block chain. The files can only be transmitted to a select group of servers forming a private block chain network within the entity server systems after the files are transmitted to the target location. As such, the system can recalculate the hashes and match hash blocks to identify an exact file location of a transmission failure.