Blockchain com JavaScript

Apresentação com exemplos, benefícios e possibilidades da utilização de Blockchain com JavaScript em aplicações reais.

Transcript

1. Blockchain
   com
   JavaScript
   

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2. Sou Beto Muniz
   @obetomuniz
   

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3. Sou Beto Muniz
   @obetomuniz
   minasdev.org
   

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4. Sou Beto Muniz
   @obetomuniz
   https://developers.google.com/experts/people/beto-muniz
   

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6. import SHA256 from "js-sha256"
   class Block {
   constructor(index, data, previousHash) {
   this.index = index
   this.timestamp = new Date()
   this.data = data
   this.previousHash = previousHash
   this.hash = this.calcHash()
   }
   calcHash() {
   const sha = SHA256.create()
   sha.update(`${this.index}${this.timestamp}${this.data}${this.previousHash}`)
   return sha.hex()
   }
   static generator(block = { index: 0, hash: "0" }, data = "genesis") {
   return new Block(block.index, data, block.hash)
   }
   }
   https://github.com/openblockchains/awesome-blockchains/blob/master/blockchain.js/blockchain.js
   

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9. Blockchain
   “Cadeia de Blocos”
   

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10. História
    do Blockchain
    

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11. 2008
    O conceito é publicado por Satoshi Nakamoto
    

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12. 2009
    Começa a blockchain Bitcoin
    

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13. 2014
    Surge o termo “Blockchain 2.0”
    

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14. 2015
    Surge a blockchain Ethereum
    Criada por Vitalik Buterin
    

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15. 2016
    +1 bilhão de dólares investidos
    https://www.businessinsider.com/blockchain-technology-is-already-a-1-billion-dollar-industry-and-its-just-the-beginning-2016-6
    

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16. 2018
    +1600 criptomoedas
    +500 bilhões de reais de valor de mercado
    +2000 aplicações descentralizadas na Ethereum
    https://en.wikipedia.org/wiki/List_of_cryptocurrencies https://coinmarketcap.com | https://www.stateofthedapps.com
    

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17. 2019
    ???
    

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18. Conceito
    Blockchain
    

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19. É um banco de dados distribuído com
    uma lista (chain) de registros (blocks)
    interligados e seguros (linked hashes)
    

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20. Linked
    Hashes?!
    

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21. Crypto
    Hashes.
    

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22. E
    como funciona?
    

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23. Hashing
    Criptografia
    P2P Network
    Nodes
    Assinaturas Digitais
    Proof of Steak
    Proof of Authority
    Turing Completude
    InterPlanetary File System
    Consensus Protocols
    Delegated Proof of Stake
    Byzantine Fault Tolerance
    Proof of Work
    Smart Contracts
    Sidechains
    Tokens
    ÐApps
    Consortium blockchains
    

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25. Mas então como
    aprender Blockchain?
    

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27. A natureza da conceito
    blockchain não é linear
    E na prática…
    

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28. Composição
    de conceitos
    

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30. Bitcoin
    blockchain
    Hashing
    Criptografia
    P2P Network
    Nodes
    Moeda Digital
    Proof of Work
    Imutabilidade
    

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31. Ethereum
    blockchain
    Smart Contracts
    Criptografia
    ÐApps
    Turing Completude
    Tokens
    Proof of Steak
    Imutabilidade
    

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32. Blockchain NÃO é o Bitcoin
    
    Bitcoin É um caso de uso do conceito blockchain
    

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33. BlockchainS
    “CadeiaS de Blocos”
    

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34. https://votolegal.com.br
    Justiça Eleitoral
    

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35. https://www.techrepublic.com/article/ibm-taps-blockchain-to-combat-food-contamination-in-global-supply-chain
    Logística
    

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36. https://www.techrepublic.com/article/why-blockchain-could-be-your-next-form-of-id-as-a-world-citizen
    Crises Humanitárias
    

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37. https://techcrunch.com/2017/04/26/spotify-acquires-blockchain-startup-mediachain-to-solve-musics-attribution-problem
    Música e Streaming
    

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38. https://www.criptomoedasfacil.com/odebrechet-cria-ferramenta-blockchain-para-monitorar-licitacoes-em-acordo-com-o-ministerio-publico-federal
    Anti-Corrupção Política
    

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39. https://www.bndes.gov.br/wps/portal/site/home/imprensa/noticias/conteudo/bndes-lanca-consulta-publica-em-busca-de-componentes-blockchain-para-o-bndestoken
    Gestão Pública
    

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40. https://www.iota.org/get-started/what-is-iota
    Internet das Coisas
    

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42. Transparência de dados
    Governança Descentralizada
    Performance
    Segurança
    Privacidade*
    Rastreabilidade de Informação
    Imutabilidade
    Escalabilidade
    Tokenização
    Aplicabilidade
    …
    Open Source
    Comunidade
    Baixo Custo
    

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43. Como
    Aplicar?!
    

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44. JavaScript
    

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45. História
    do JavaScript
    

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52. JAVASCRIPT
    EVERYWHERE
    

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53. Aplicações Mobile Nativas
    Browser
    Aplicações para SmartTVs
    Banco de Dados
    Aplicações de Linha de Comando
    Aplicações Desktop
    Sistemas Operacionais
    Blockchain
    Servidor
    Games*
    Progressive Web Apps
    Internet das Coisas
    

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54. Utilizada por grandes empresas
    Ecossistema vasto
    Multiparadigma
    Gerada para um mundo conectado
    Fácil de iniciar os estudos
    Mercado abundante e generoso
    Melhoria contínua
    Comunidade vibrante e ativa
    …
    Auxilia no aprendizado de outras linguagens
    Linguagem mais popular do mundo
    

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55. 2019
    2020, 2021, …
    

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57. JavaScript
    +
    
    Blockchain
    

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58. Ethereum
    “com” JavaScript
    https://www.ethereum.org
    

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59. Smart Contracts
    https://www.ethereum.org
    

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60. https://www.ethereum.org/token
    pragma solidity ^0.4.20;
    contract HubConToken {
    mapping (address => uint256) public balanceOf;
    function HubConToken(uint256 initialSupply) public {
    balanceOf[msg.sender] = initialSupply;
    }
    function transfer(address _to, uint256 _value) public returns (bool success) {
    require(balanceOf[msg.sender] >= _value);
    require(balanceOf[_to] + _value >= balanceOf[_to]);
    balanceOf[msg.sender] -= _value;
    balanceOf[_to] += _value;
    return true;
    }
    }
    

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61. https://github.com/s-tikhomirov/smart-contract-languages
    Vyper
    Solidity
    LLL - Lisp*
    Ethereum bytecode
    Bamboo
    eWASM - WebAssembly*
    Serpent - Python*
    SolidityX
    Pyramid
    Flint
    Yul
    Babbage
    Mutan - C*
    Idris
    Lolisa
    L4
    Formality
    Logikon
    

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62. ÐApps
    Aplicações Descentralizadas
    https://www.ethereum.org
    

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63. Centralizadas
    Ponto de Falha Único
    https://www.ethereum.org
    

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64. Distribuídas
    Micro Services
    Centralizadas
    Ponto de Falha Único
    https://www.ethereum.org
    

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65. Distribuídas
    Micro Services
    Descentralizadas
    Blockchains
    Centralizadas
    Ponto de Falha Único
    https://www.ethereum.org
    

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66. web3.js
    Ethereum JavaScript API
    https://github.com/ethereum/web3.js
    

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67. import web3 from "web3"
    const ORIGEM = “0xf4e36a1c193e687b459f22d3512dd0cfec289fd3"
    const DESTINO = "0xcc16e3c00dbbe76603fa833ec20a48f786dfe611"
    const HubConTokenSmartContract = "0xcc16e3c00dbbe76603fa833ec20a48f786dfe610"
    const HubConTokenABIObject = { ... }
    const SmartContract = await new web3.eth.Contract(
    HubConTokenABIObject,
    HubConTokenSmartContract
    )
    SmartContract.methods.transfer(DESTINO, 1).send({ from: ORIGEM })
    

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68. import web3 from "web3"
    const ORIGEM = “0xf4e36a1c193e687b459f22d3512dd0cfec289fd3"
    const DESTINO = "0xcc16e3c00dbbe76603fa833ec20a48f786dfe611"
    const HubConTokenSmartContract = "0xcc16e3c00dbbe76603fa833ec20a48f786dfe610"
    const HubConTokenABIObject = { ... }
    const SmartContract = await new web3.eth.Contract(
    HubConTokenABIObject,
    HubConTokenSmartContract
    )
    SmartContract.methods.transfer(DESTINO, 1).send({ from: ORIGEM })
    

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69. import web3 from "web3"
    const ORIGEM = “0xf4e36a1c193e687b459f22d3512dd0cfec289fd3"
    const DESTINO = "0xcc16e3c00dbbe76603fa833ec20a48f786dfe611"
    const HubConTokenSmartContract = "0xcc16e3c00dbbe76603fa833ec20a48f786dfe610"
    const HubConTokenABIObject = { ... }
    const SmartContract = await new web3.eth.Contract(
    HubConTokenABIObject,
    HubConTokenSmartContract
    )
    SmartContract.methods.transfer(DESTINO, 1).send({ from: ORIGEM })
    

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70. import web3 from "web3"
    const ORIGEM = “0xf4e36a1c193e687b459f22d3512dd0cfec289fd3"
    const DESTINO = "0xcc16e3c00dbbe76603fa833ec20a48f786dfe611"
    const HubConTokenSmartContract = "0xcc16e3c00dbbe76603fa833ec20a48f786dfe610"
    const HubConTokenABIObject = { ... }
    const SmartContract = await new web3.eth.Contract(
    HubConTokenABIObject,
    HubConTokenSmartContract
    )
    SmartContract.methods.transfer(DESTINO, 1).send({ from: ORIGEM })
    

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71. import web3 from "web3"
    const ORIGEM = “0xf4e36a1c193e687b459f22d3512dd0cfec289fd3"
    const DESTINO = "0xcc16e3c00dbbe76603fa833ec20a48f786dfe611"
    const HubConTokenSmartContract = "0xcc16e3c00dbbe76603fa833ec20a48f786dfe610"
    const HubConTokenABIObject = { ... }
    const SmartContract = await new web3.eth.Contract(
    HubConTokenABIObject,
    HubConTokenSmartContract
    )
    SmartContract.methods.transfer(DESTINO, 1).send({ from: ORIGEM })
    

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73. Ark
    com JavaScript
    https://ark.io
    

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74. https://ark.io
    Ark
    com JavaScript, PHP, Swift, Go, .NET, Python, Java, …
    

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75. ark-js
    Ark Blockchain Client
    https://github.com/ArkEcosystem/ark-js
    

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76. https://marketplace.arkaces.com/dashboard
    

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77. Hyperledger
    com JavaScript
    https://www.hyperledger.org
    

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78. Chaincode
    https://www.hyperledger.org
    

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79. import shim from "fabric-shim";
    class Chaincode {
    Init(stub) {
    return stub
    .putState("chave", Buffer.from("valor"))
    .then(() => shim.success(), () => shim.error());
    }
    Invoke(stub) {
    return stub.getState("chave").then(() => shim.success());
    }
    };
    shim.start(new Chaincode());
    

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80. import shim from "fabric-shim";
    class Chaincode {
    Init(stub) {
    return stub
    .putState("chave", Buffer.from("valor"))
    .then(() => shim.success(), () => shim.error());
    }
    Invoke(stub) {
    return stub.getState("chave").then(() => shim.success());
    }
    };
    shim.start(new Chaincode());
    

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81. Lisk
    100% JavaScript
    

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82. https://blog.github.com/2018-11-15-state-of-the-octoverse-top-programming-languages | https://insights.stackoverflow.com/survey/2018
    

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83. Sidechain
    

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84. const lisk = require('lisk-elements').default;
    const client = lisk.APIClient.createTestnetAPIClient();
    const tx = lisk.transaction.transfer({
    recipientId: "YOUR LISK ID",
    passphrase: "YOUR PASSPHRASE HERE",
    amount: "1",
    data: "Hello World"
    });
    try {
    client.transactions.broadcast(tx);
    } catch(err) {
    console.log(err.message);
    }
    å
    https://lisk.io/documentation/lisk-elements/packages/api-client
    

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85. const lisk = require('lisk-elements').default;
    const client = lisk.APIClient.createTestnetAPIClient();
    client.dapps.get({ name: 'LiskKitties' })
    .then(res => {
    console.log(res.data);
    })
    https://lisk.io/documentation/lisk-elements/packages/api-client
    

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88. Obrigado!
    @obetomuniz
    

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