FAQ: Build your own Mini-Blockchain! - Blockchain Summary

This community-built FAQ covers the “Blockchain Summary” exercise from the lesson “Build your own Mini-Blockchain!”.

Paths and Courses
This exercise can be found in the following Codecademy content:

Introduction to Blockchain

FAQs on the exercise Blockchain Summary

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I have a few questions regarding the Blockchain class in the exercise:

  • What is the use of the attribute all_transactions in the Blockchain class? In the class, the value of all_transactions was never changed and remains as empty list.
  • How to use the proof_of_work method? Should there be a method for miners to find the nonce for the proof, broadcast it and then waiting for 51% of the participants to verify the proof before a new block is being added to the chain in add_block method?

In this lesson an object-oriented approach is used (i.e. blockchain, block as classes with methods). In the real world is this necessary, or do developers also use functional programming to deal with the same sequences (i.e. hashing, adding blocks, validating, etc.)?