## Transition to Web3 - Course 1 | Blockchain Basics

š**Ā **Woohoo! You created your first hash.

Hashing enables us to efficiently compare whether data is changed. Many structures in the blockchain will be built using hashing.

Now, ask yourself: š¤ Given a hash, could a computer find out what the input is?

Itās impossible to do so. A computer would be going through 2Ā²āµā¶ different inputs to find the matching hash, which is a lot of calculations and there is no such computational power in the world.Ā

Next, letās explore what a block is.