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Let's build a blockchain – A mini-cryptocurrency in Ruby [video]

• ariza 9y ago
  wanna learn it
• 1ba9115454 9y ago
  This is probably the best mini implementation I've seen so far. The code is hosted at https://github.com/Haseeb-Qureshi/lets-build-a-blockchain https://github.com/Haseeb-Qureshi/lets-build-a-blockchain He's missed one thing though, which a lot of these small implmentations miss, its the code for chain re-org. https://en.bitcoin.it/wiki/Chain_Reorganization https://en.bitcoin.it/wiki/Chain_Reorganization This is a crucial piece of code that figures out which chain is correct if 1 or more blocks arrive that have a greater proof of work than your current best chain. But otherwise, a very good attempt.
  • xiphias 9y ago
    As far as I saw the whole blockhain is serialized and sent to the peers, so taking care of chair reorgs is trivial (and done in the video). What's really missing is difficulty retargeting.
• giancarlostoro 9y ago
  I want to see "let's build a blockchain" minus the cryptocurrency. My understanding was that Medical and Financial institutions were more interested in the ledger not so much the currencies behind bitcoin and other cryptocurrencies. Or am I looking at this all wrong?
• jschulenklopper 9y ago
  Here's an earlier example I found, building a tiny blockchain in Python: https://hackernoon.com/learn-blockchains-by-building-one-117428612f46 https://hackernoon.com/learn-blockchains-by-building-one-117.... Long, but accessible introduction. "The fastest way to learn how Blockchains work is to build one."