Hash
A fixed-length fingerprint of a file that changes completely if the file changes.
A hash is the output of a function that turns any file into a fixed-length string. The same file always produces the same string, and changing a single byte produces a completely different one.
Publishing a hash for every source screenshot lets anyone holding the original file recompute the value and compare. A match shows the file has not changed since it was hashed. It does not show who captured it or that the conversation happened.
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In practice: How to show a screenshot has not been edited