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kotlinlang

Hello everyone, good night!
I'm learning FP and Arrow working on a sample project, so there's probably something to improve.
The code is a blockchain implementation and some tests to ensure that everything is working.
Any critics or suggestions about implementation (specially on Arrow's usage) will be highly appreciated.
Here's the link: <https://github.com/alissonfpmorais/KarChain/tree/master/blockchain/src>
Thanks you in advance!