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What is a cryptographic hash?

A cryptographic hash function is an algorithm that can be run on data such as an individual file or a password to produce a value called a checksum. The main use of a cryptographic hash function is to verify the authenticity of a piece of data. Two files can be assumed to be identical only if the checksums generated from each file, using the same cryptographic hash function, are identical.

This quote from the lifewire article describes it quite well. We recommend you read the article in full to fully understand the use cases of cryptographic hashes and why a system like Logware that can store them in bulk on a blockchain has value.