Building decentralized applications (dapps) on Ethereum - Eva Shon, & Igor Lilic, ConsenSys
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Learn how to build Dapps using: Open source tools (Truffle, IPFS, Lightwallet and BTC Relay), ConsenSys tools (BlockApps API and Microsoft Azure BlockApps nodes) and other ConsenSys tools (MetaMask, a Chrome Ethereum plugin, or uPort, an ID management system). Eva Shon & Igor Lilic, ConsenSys
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Building decentralized applications (dapps) on Ethereum - Eva Shon, & Igor Lilic, ConsenSys
- 1. Building Ethereum apps (dapps) with... Truffle - build and deploy Ethereum dapps Lightwallet - simple browser wallet IPFS - decentralized file storage BTCRelay - verify Bitcoin transactions
- 4. truffle.readthedocs.iotruffle.readthedocs.io Ethereum Node Ethereum / or Private Network DAPP (using Web3.js)
- 5. truffle.readthedocs.iotruffle.readthedocs.io Ethereum Node Ethereum / or Private Network Smart Contract DAPP (using Web3.js)
- 6. truffle.readthedocs.iotruffle.readthedocs.io Ethereum Node Ethereum / or Private Network Solidity Compiler DAPP (using Web3.js) Smart Contract
- 7. truffle.readthedocs.iotruffle.readthedocs.io Ethereum Node Ethereum / or Private Network DAPP (using Web3.js) Solidity Compiler Smart Contract Compiled binary + ABI ABI = Application Binary Interface to variables & functions in the Contract
- 8. truffle.readthedocs.iotruffle.readthedocs.io Ethereum Node Ethereum / or Private Network Solidity Compiler DAPP (using Web3.js) Key Smart Contract nonce = 0 DAPP pushes compiled contract to network Compiled binary + ABI
- 9. truffle.readthedocs.iotruffle.readthedocs.io Ethereum Node Ethereum / or Private Network Solidity Compiler DAPP (using Web3.js) Key Smart Contract nonce = 0 1 2 3 nonces prevent pushing duplicate transactions and increase for the lifetime of a key DAPP pushes compiled contract to network Compiled binary + ABI
- 10. truffle.readthedocs.iotruffle.readthedocs.io Ethereum Node Ethereum / or Private Network Solidity Compiler DAPP (using Web3.js) Key nonce = 0 DAPP pushes compiled contract to network Compiled binary + ABISmart Contract After Contract posted to blockchain returns Address Address added to ABI 1 2 3 4
- 11. truffle.readthedocs.iotruffle.readthedocs.io Ethereum Node Ethereum / or Private Network Solidity Compiler DAPP (using Web3.js) Key Smart Contract After Contract posted to blockchain returns Address 1 2 3 4 Contract Creation Transaction Address added to ABI nonce = 0 DAPP pushes compiled contract to network Compiled binary + ABI
- 12. truffle.readthedocs.iotruffle.readthedocs.io Ethereum Node Ethereum / or Private Network Solidity Compiler DAPP (using Web3.js) Key nonce = 1 Key Frontend can now make calls to contract on blockchain: Address + ABI + nonce nonce = 0 DAPP pushes compiled contract to network Smart Contract 1 2 3 After Contract posted to blockchain returns Address 4 5 Regular Transactions with Smart Contracts on Blockchain (Ether transfer or Function calls) Compiled binary + ABI Address added to ABI
- 13. truffle.readthedocs.iotruffle.readthedocs.io Ethereum Node Ethereum / or Private Network Solidity Compiler DAPP Key nonce = 1 Key Frontend can now make calls to contract on blockchain: Address + ABI + nonce nonce = 0 DAPP pushes compiled contract to network Compiled binarySmart Contract Address + ABI 1 2 3 After Contract posted to blockchain returns Address + ABI 4 5 … is a command-line tool to help you compile, deploy, link and test smart contracts … and build a front-end
- 14. truffle.readthedocs.iotruffle.readthedocs.io Ethereum Node Ethereum / or Private Network Solidity Compiler DAPP Key nonce = 1 Key Frontend can now make calls to contract on blockchain: Address + ABI + nonce nonce = 0 DAPP pushes compiled contract to network Compiled binarySmart Contract Address + ABI 1 2 3 After Contract posted to blockchain returns Address + ABI 4 5 … is a command-line tool to help you compile, deploy, link and test smart contracts … and build a front-end JavaScript, SASS, ES6 and JSX Mocha and Chai
- 15. truffle.readthedocs.iotruffle.readthedocs.io Ethereum Node Ethereum / or Private Network Solidity Compiler DAPP Key Key Smart Contract Keystore Transactions can be signed in the Ethereum Node by Web3.js, or signed in the front-end and pushed to the node as a “raw transaction” (our next topic… :) All Transactions* must be signed with keys and require gas * any changes to state (writes, etc.) Compiled binary + ABI Address added to ABI
- 16. truffle.readthedocs.io Installing and Using Truffle
- 17. truffle.readthedocs.iotruffle.readthedocs.io $ npm -g install truffle
- 18. truffle.readthedocs.iotruffle.readthedocs.io testrpc $ npm install -g ethereumjs-testrpc solc https://github.com/ethereum/go- ethereum/wiki/Contract-Tutorial#using-an-online- compiler
- 19. truffle.readthedocs.iotruffle.readthedocs.io New truffle project $ mkdir newproj && cd newproj $ truffle init Creates this in newproj/
- 20. truffle.readthedocs.iotruffle.readthedocs.io Compile smart contracts (do you have solc installed?) $ truffle compile Deploy smart contract to blockchain Run an Ethereum node (like testrpc) $ truffle deploy Run truffle tests from test/ directory $ truffle test Run a server from localhost $ truffle serve
- 23. github.com/ConsenSys/eth-lightwallet A minimal Ethereum browser wallet
- 25. github.com/ConsenSys/eth-lightwallet Lightwallet Features HD Wallet - 12 word seed generates HD tree of addresses - Private key encrypted in browser (+ Password) - Lost private key? Can regenerate with 12 word seed External transactions - Transactions not signed by an Ethereum client - For example using github.com/ConsenSys/hooked-web3-provider
- 28. Building Ethereum apps (dapps) with Ipfs.io (decentralized file storage)
- 30. github.com/ethereum/btcrelay A relay between Bitcoin and Ethereum
- 31. github.com/ethereum/btcrelay BTCRelay Verify Bitcoin payments in Ethereum Available on Morden (Ethereum testnet) or live Ethereum (main net)