Ethereum dapps20171205
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The document provides information about Kenneth Hu, an organizer of a blockchain technology group, and various resources related to blockchain development including websites, social media pages, documentation, tools, and programming languages. It includes descriptions of different Ethereum networks like Ropsten, Rinkeby, and Kovan for testing smart contracts, as well as tools for writing, deploying, and interacting with smart contracts and decentralized applications.
![ Geth attch
Personal.listAccounts
eth.getBalance(personal.listAccounts[0])](https://image.slidesharecdn.com/ethereumdapps20171205-171206024051/85/Ethereum-dapps20171205-15-320.jpg)
![ >geth [options] command [command options] [args…]
Testnet
Geth –testnet Rinkeby –datadir C:ethereumrinkeby
TestRPC
Geth attach http://localhost:8545
Command practice
Personal.listAccounts
Eth.syncing
https://github.com/ethereum/go-ethereum/wiki/Command-Line-Options
geth attach http://localhost:8545](https://image.slidesharecdn.com/ethereumdapps20171205-171206024051/85/Ethereum-dapps20171205-20-320.jpg)
![ We assert that all contracts will have the interface definitions of any contracts
they call available at compile-time.
[{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uin
t256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"
inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name
":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"funct
ion"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","t
ype":"uint256"}],"name":"transfer","outputs":[{"name":"","type":"bool"}],"payable":fa
lse,"stateMutability":"nonpayable","type":"function"},{"anonymous":false,"inputs":[
{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":
"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Transfer","ty
pe":"event"}]](https://image.slidesharecdn.com/ethereumdapps20171205-171206024051/85/Ethereum-dapps20171205-21-320.jpg)
Ethereum dapps20171205
- 1. 2017/11/28 Kenneth Hu (full stack developer) Kenneth.hu@Hotmail.com
- 2. I am Kenneth ( organizer of BlockChain & Dapps Technology). Welcome to join the BlockChain Technology group. I like use blockchain technologies (Ethereum, hyperledger and so on) to build decentralized db applications and change the world. Join the discussion with me !! WebSite : http://sgblockchain.sg/ FaceBook : https://www.facebook.com/groups/140517386608407 linkedin : https://www.linkedin.com/groups/10359719 Slack : https://goo.gl/iXLFi8 Meetup : https://www.meetup.com/BlockChain-Dapps-Technology/ Dapps Demo site : WebSite : http://www.kennethhu.net/example/ethereum/index.html Video : https://youtu.be/9dWxJcLajGY Github : https://github.com/kennethhutw/Ethereum-Dapps
- 8. Write Solidity Code Deploy Solidity code to Ethereum Write front end code (Web, IOS, Android)
- 9. Pure DApp: IPFS/Swarm/AWS/GCE Client (Web, mobile) Miner Ethereum Network
- 10. Server API Sibling DApp: Miner Ethereum Network Client (Web, mobile) IPFS/Swarm/AWS/GCE Internet
- 11. Protected DApp: Server API Miner Ethereum Network Client (Web, mobile) IPFS/Swarm/AWS/GCE Internet
- 12. REMIX Blockchain IDE – Remix Library – Web3.js Dapp browsers– MetaMask Smart Contract Language - Solidity Simulator - testRPC ChainCode– go-ethereum/Geth
- 13. Client Language Developers go-ethereum Go Ethereum Foundation Parity Rust Ethcore cpp-ethereum C++ Ethereum Foundation pyethapp Python Ethereum Foundation ethereumjs-lib Javascript Ethereum Foundation Ethereum(J) Java <ether.camp> ruby-ethereum Ruby Jan Xie ethereumH Haskell BlockApps http://ethdocs.org/en/latest/ethereum-clients/choosing-a-client.html#why-are-there-multiple-ethereum-clients
- 14. Library Language Web3.js JavaScript web3J Java Nethereum C# .NET Ethereum-ruby Ruby http://ethdocs.org/en/latest/connecting-to- clients/index.html?highlight=Connecting%20to%20Ethereum%20Clients
- 15. Geth attch Personal.listAccounts eth.getBalance(personal.listAccounts[0])
- 16. Command : testrpc
- 17. How to use METAMASK Create Account Import Accounts Private key JSON File Network Get Testcoin from testnet
- 18. Ethereum : Value token
- 19. User invoking the transaction pays for the execution. Measures : kWH used Measures : Gallions of water used Gas is the unit in which EVM resource usage is measured.
- 20. >geth [options] command [command options] [args…] Testnet Geth –testnet Rinkeby –datadir C:ethereumrinkeby TestRPC Geth attach http://localhost:8545 Command practice Personal.listAccounts Eth.syncing https://github.com/ethereum/go-ethereum/wiki/Command-Line-Options geth attach http://localhost:8545
- 21. We assert that all contracts will have the interface definitions of any contracts they call available at compile-time. [{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uin t256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true," inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name ":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"funct ion"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","t ype":"uint256"}],"name":"transfer","outputs":[{"name":"","type":"bool"}],"payable":fa lse,"stateMutability":"nonpayable","type":"function"},{"anonymous":false,"inputs":[ {"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type": "address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Transfer","ty pe":"event"}]
- 23. Network Network ID Note Main 1 Morden 2 deprecated ropsten 3 Rinkeby 4 Kovan 42
- 24. REMIX Local Geth IDE – Remix Library – Web3.js Dapp browsers– MetaMask Smart Contract Language - Solidity Simulator - testRPC