Now we can use the code in our previous exercise to spot a broken link. Let’s try tampering with the contents of the block and see how that creates a mismatch between hash values.

Instantiate a new Blockchain object called my_blockchain.

Add a new block to my_blockchain and pass in new_transactions as the argument.

Print out the contents of my_blockchain to see the new block!

Remember, the .add_block() method is used to add a block. This method has new_transactions as its parameter. Similarly, the print_blocks() method is used to print the contents of a Blockchain object.

Select the transactions found in my_blockchain‘s chain attribute. Set the transactions variable of Block 1 to the string "fake_transactions".

Use my_blockchain.chain[1] to grab Block 1 on the blockchain. You can access this block’s transactions using the transactions attribute.

Now let’s check if the blockchain is still valid by calling the correct method on my_blockchain!

Remember, the validate_chain() method is used to validate a Blockchain object.