February 2019
Intermediate to advanced
450 pages
9h 59m
English
Content preview from Hands-On Blockchain for Python Developers
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From linked list to blockchain
Now we know that only Nelson can write Nelson likes cats or Nelson hates cats, we can be at peace. However, to make the tutorial code short, we won't integrate the validation using the private key and the public key. We assume only authorized people are able to write the history in the block. Take a look at the following code block:
>>> block_A.history = 'Nelson likes cat'
When that happens, we assume it's Nelson who wrote that history. So, what is the problem in recording data with a linked list?
The problem is that the data can be altered easily. Say Nelson wants to be a senator. If many people in his district don't like cats, they may not be happy with the fact that Nelson likes them. Consequently, Nelson ...
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