Dive deep into blockchain

Blockchain became very popular due to the cryptocurrencies boom in the last few years. It is an interesting technology choice, but with every advantage comes a challenge that needs to be thoroughly reviewed and addressed. Feedback: https://joind.in/talk/2fdb3 .

Transcript

1. blockchain
   dive deep into
   Tomasz Kowalczyk @tmmx
   

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4. blockwhat?
   

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5. database
   

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6. chain of blocks
   

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7. block of data
   

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8. data structure
   

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9. cryptocurrency
   

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10. general purpose
    

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11. blockwhy?
    

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12. immutability
    

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13. append only
    

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14. traceability
    

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15. verifiability
    

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16. tamper proof
    

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17. integrity
    

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18. reproducibility
    

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19. decentralization
    

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20. trust(less)
    

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21. transparency
    

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22. blockwhen?
    

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23. voting
    medical records
    cloud storage
    financial transactions
    decentralized messaging
    property registry
    land sales
    insurance
    digital wallets
    smart contracts
    crowdfunding
    property ownership
    social networking
    P2P finances
    virtual countries
    asset trading
    

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24. few hours later...
    

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25. loyalty programs
    internal currency
    regulatory reporting
    cross-border payments
    smart contracts
    ecommerce
    digital identity
    anti-counterfeiting
    mechanisms
    

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26. blockhow?
    

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27. public
    shared
    private
    

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28. cryptography
    

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29. addresses
    

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30. hash algorithm
    

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31. Merkle tree
    aka. binary hash tree
    

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32. A B C D
    HAB HCD
    R
    B Merkle path: R-HAB-HB
    HA HB HC HD
    

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33. genesis block
    

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34. consensus
    

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35. proof of work
    proof of stake
    

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36. example
    

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37. Hashchain?
    

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38. $storage = new SqliteStorage('chain.sq3');
    $signer = new OpenSslSigner('private.key', 'public.key');
    $genesis = new GenesisBlock('fiat lux');
    $state = new State();
    $chain = new Hashchain($storage, $signer, $genesis, $state);
    $chain->createBlock(new CreateAccount('A', 'Alpha'));
    $chain->createBlock(new CreateAccountWithCredits('Z', 'Zulu', 1000));
    $chain->createBlock(new SendCredits('Z', 'A', 100));
    

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39. // Not enough credits: Z sent 100 to A and has only 900!
    $chain->createBlock(new SendCredits('Z', 'A', 1000));
    // Sender X does not exist!
    $chain->createBlock(new SendCredits('X', 'A', 1000));
    // Account Zulu already exists!
    $chain->createBlock(new CreateAccount('Z', 'Zulu'));
    

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40. challenges
    

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41. conflict resolution
    

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42. integration with
    existing systems
    

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43. performance
    scalability
    throughput
    

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44. mining and incentives
    rewards for maintaining network nodes
    

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45. security
    

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46. privacy
    

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47. hard forks
    

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48. summary
    

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49. right solution
    for the right kind of problem
    

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50. Event Sourcing
    (on steroids)
    

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51. scratching surface
    

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52. BlocQuestions?
    

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53. Slides
    https://speakerdeck.com/thunderer/dive-deep-into-blockchain
    Resources
    http://www.imponderablethings.com/2013/07/how-bitcoin-works-under-hood.html
    http://chimera.labs.oreilly.com/books/1234000001802/index.html (Mastering Bitcoin)
    https://www.coindesk.com/math-behind-bitcoin (EC)
    https://en.wikipedia.org/wiki/Four_Knights_Game (Chess)
    http://queue.acm.org/detail.cfm?id=3136559 (Bitcoin)
    https://blog.acolyer.org/2017/08/30/a-concurrent-perspective-on-smart-contracts (smart contracts)
    https://en.bitcoin.it/wiki/Secp256k1 (Bitcoin Elliptic Curve)
    Pictures (Creative Commons)
    https://www.flickr.com/photos/skyseeker/14404947216 (lightning)
    https://www.flickr.com/photos/atermath/3053484935 (stripes)
    https://www.flickr.com/photos/randnotizenorg/32110828536 (electronic)
    https://www.flickr.com/photos/23221002@N00/7204014842 (equations)
    https://www.flickr.com/photos/spookyamd/14184019077 (mountain)
    https://www.flickr.com/photos/s1ng0/5445857570 (trees)
    https://www.flickr.com/photos/95213174@N08/10329928973 (handshake)
    https://www.flickr.com/photos/wiertz/4563720850 (signature)
    https://www.flickr.com/photos/33279673@N03/5482493912 (chains)
    

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54. please rate the talk and give feedback on
    joind.in/talk/74cb2
    

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55. Thankschain!
    github /thunderer
    twitter @tmmx
    

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