Dive deep into blockchain

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blockchain dive deep into Tomasz Kowalczyk @tmmx

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blockwhat?

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database

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chain of blocks

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block of data

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data structure

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cryptocurrency

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general purpose

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blockwhy?

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immutability

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append only

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traceability

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verifiability

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tamper proof

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integrity

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reproducibility

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decentralization

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trust(less)

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transparency

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blockwhen?

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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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few hours later...

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

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blockhow?

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public shared private

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cryptography

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addresses

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hash algorithm

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Merkle tree aka. binary hash tree

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

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genesis block

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consensus

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proof of work proof of stake

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example

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Hashchain?

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$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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// 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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challenges

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conflict resolution

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integration with existing systems

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performance scalability throughput

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mining and incentives rewards for maintaining network nodes

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security

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privacy

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hard forks

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summary

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right solution for the right kind of problem

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Event Sourcing (on steroids)

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scratching surface

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BlocQuestions?

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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)