How does a blockchain work- Simply Explained

Published by bizcon on

Published on Nov 13, 2017

What is a blockchain and how do they work? I’ll explain why blockchains are so special in simple and plain English! ? Want to buy Bitcoin or Ethereum? Buy for $100 and get $10 free (through my affiliate link): https://www.coinbase.com/join/5928452… ? Sources can be found on my website: https://www.savjee.be/videos/simply-e… ? Follow me on Twitter: https://twitter.com/savjee ✏️ Check out my blog: https://www.savjee.be ✉️ Subscribe to newsletter: https://goo.gl/nueDfz ?? Like my Facebook page: https://www.facebook.com/savjee
COMMENTS
GraveDiggerIII
I don’t understand how that makes the the system so secure. If a new block is added by someone, it is automatically sent to all nodes to keep a record. So couldn’t someone tamper with a block and manipulate the network just as easily? What I mean is, why is it so easy to have the ledger updated with legitimate transactions, but supposedly so difficult to update with fraudulent transactions?
Savjee
Well, nothing prevents you from sending a tampered block to everyone on the network. But each node that receives your block will validate it and reject it straight away. They can do this because they check every bit of information inside your block. Is the hash correct? is the proof-of-work correct? Are the transactions valid or not? etc…
Ducoci Green
That’s if we assume each node source code is identical
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