The security of ethereum network is based on the combination of hashing function and blockchain technology. Hashes are cryptographic functions. You can put any data through a hashing function and it will give you a fixed length set of numbers. The data can be anything from videos to texts. Let’s say you apply hashing function on an ebook, it would give you a fixed length set of numbers.
For example a hash of an ebook:
0x4a2b7d37607972ed1989ad39dd882292eebf9d1378fa3c4cee0f93b2bf7a79e6
If you change a single letter in the ebook, the hashing function will return you a completely different hash.
A hash of the updated ebook:
0x775e4033abfcb0b9607f2af6d9af91f3ca652d2b11e07523257654fe110b1f22
However the same original ebook will always produce the same hash. Once you have the hashing of any file it’s easier to prove or validate that you actually own or know the original file.

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