Security information evidence storage management method, system and device based on block chain

The invention relates to a blockchain-based security information evidence storage management method and device, an ultrasonic system, a storage medium and a computer program product. The method comprises the steps that in response to a first operation instruction, a target file is uploaded to a storage node and written into a block chain, a unique identifier is returned, and the unique identifier is used for representing a unique certificate for a user to obtain the target file; randomly splitting the target file, and storing the split target file in all storage nodes of the block chain in a scattered manner; in response to a second operation instruction, determining a hash value of the target file according to the unique identifier, and performing file verification based on the hash value; and after the file verification is passed, downloading the target file from the block chain. According to the invention, resource consumption can be reduced, the uniqueness and integrity of the file are ensured, and the fi