February 2019
Intermediate to advanced
450 pages
9h 59m
English
Content preview from Hands-On Blockchain for Python Developers
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Consensus
As we can see, the hashing function makes history tampering hard, but not too hard. Even if we have a blockchain that consists of 1000 blocks, it would be trivial to alter the content of the first block and change the 999 parent hashes on the other blocks with recent computers. So, to ensure that bad people cannot alter the history (or at least make it very hard), we distribute this append-only database to everyone who wants to keep it (let's call them miners). Say there are ten miners. In this case, you cannot just alter the blockchain in your copy because the other nine miners who would scold, saying something like hey, our records say history A but your record says B. In this case, the majority wins.
However, consensus is not ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.