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#IPFS explained in one tweet with room to spare: It’s the opposite of a hash function (AKA the “pre-image” of a hash). cc

do you mean, #IPFS takes a hash and returns a file?

It returns the data represented by that hash, which could be a file.

then, #IPFS is a reverse-hash - given the digest, it will return the data?

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Yes, but don't think that means you can go cracking passwords with it. :P