Writing Blockchain Clients in Swift

by Tamar Nachmany

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Writing Blockchain Clients in Swift Tamar Nachmany

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"ܪ"

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immutable decentralized database

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Ethereum

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What is Ethereum? iOS App Store Facebook Messenger Alexa Ethereum

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Alamoﬁre of iOS Ethereum Development

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Cocoapods of iOS Ethereum Development

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How does an iOS app built on top of the Ethereum blockchain work?

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iOS Client —Requests data —Requests new transactions —Interprets responses in UI Ethereum Client —Issues RPC to node & interprets responses Ethereum Node —Node containing blockchain

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Thanks to Merkle trees, it is possible to build Ethereum nodes that run on all computers and laptops large and small, smart phones, and even internet of things devices - Vitalik Buterin

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Swift on the Blockchain

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Swift on the Blockchain —Geth —Go with Objective-C runtime bindings —Parity —Rust with Objective-C runtime bindings —Web3j —Java with Java to Objective-C Translator

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@interface GethEthereumClient - (GethBigInt*)getBalanceAt:(GethContext*)ctx account:(GethAddress*)account number:(int64_t)number error:(NSError**)error;

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Swift on the Blockchain —Web3.js

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Web3.js Frameworks web3 web3-utils web3-eth web3-eth-accounts web3-eth-contract web3-eth-abi web3-eth-iban web3-bzz web3-shh

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Swift on the Blockchain —Web3.js —React Native —Run on JavaScript runtime

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Swift on the Blockchain —Web3.js —WebKit

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Challenges —Language —Go, Rust, JavaScript, Java —Peformance —JavaScript in WebKit —Architecture —JavaScript in React Native

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Web3.swift

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Web3.swift web3 web3-utils web3-eth web3-eth-accounts web3-eth-contract web3-eth-abi web3-eth-iban web3-bzz web3-shh

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Web3.swift web3-uikit web3-universal-login

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͘Π͢;͜ Tamar Nachmany @tamarshmallows

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Watch this ﬁrst Web3.js 1.0 Fabian Vogelsteller Ethereum Foundation Developers Conference http://bit.ly/2HU6sDN

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Image Credits Slides 1, 14, 16: Mamie Rheingold