escrow-contract-with-truffle – 块菌托管合同区块链毕设代写

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escrow-contract-with-truffle

Ethereum smart contract with truffle/solidity.

Based on Ethereum: Building Blockchain Decentralized Apps Linkedn learning course.

Ethereum/Solidity

  • Pure functions: They don’t (should not) read or modify the state. See this example. They don’t cost gas, there is a caveat.

  • Ethereum Virtual Machine (EVM) does not compile source code. It only parses byte code. So, compile your contract before deploying it.

  • Solidity cheatsheet.

Development Set-up

  • Truffle: Development environment for EVM.
  • Ganache: Blockchain for Ethereum.
  • Run Ganache: chmod a+x ganache-2.5.4-linux-x86_64.AppImage and ./ganache-2.5.4-linux-x86_64.AppImage
  • truffle init: Start a project.
  • truffle create <contract_name>: Create a contract scaffold.
  • truffle compile: Compile contract(s).
  • To use Ganache update truffle-config.js with Ganache parameters.
    // Another network with more advanced options... *** GANACHE ***     ganache: {     port: 7545,             // Custom port     network_id: 5777,       // Custom network     gas: 6721975,           // Gas sent with each transaction (default: ~6700000)     gasPrice: 20000000000,  // 20 gwei (in wei) (default: 100 gwei)     from: 0xAa8A9823D2b9CFB3AD0E2209Ed5A02E0afFA4c54,        // Account to send txs from (default: accounts[0])     websocket: true        // Enable EventEmitter interface for web3 (default: false)     } 
  • Migrations:
    • Blockchain is immutable, hence the code of the smart contracts. Every change has to be documented with migration scrips.
    • 1_blah: The number followed by an underscore determines the order of the migrations. The rest is for humans.
    • Truffle init creates a Migration contract and an initial migration script.
    • For our contract(s), we need to create (a) migration script(s).
    • See here for more on migration scripts.
  • truffle migrate <network_name>: Migrate (deploy) our contract(s) to specified network. For our case, the network name is ganache.
  • Confirm the transaction on the Blockchain via Ganache UI.

escrow-contract-with-truffle

Ethereum smart contract with truffle/solidity.

Based on Ethereum: Building Blockchain Decentralized Apps Linkedn learning course.

Ethereum/Solidity

  • Pure functions: They don’t (should not) read or modify the state. See this example. They don’t cost gas, there is a caveat.

  • Ethereum Virtual Machine (EVM) does not compile source code. It only parses byte code. So, compile your contract before deploying it.

  • Solidity cheatsheet.

Development Set-up

  • Truffle: Development environment for EVM.
  • Ganache: Blockchain for Ethereum.
  • Run Ganache: chmod a+x ganache-2.5.4-linux-x86_64.AppImage and ./ganache-2.5.4-linux-x86_64.AppImage
  • truffle init: Start a project.
  • truffle create <contract_name>: Create a contract scaffold.
  • truffle compile: Compile contract(s).
  • To use Ganache update truffle-config.js with Ganache parameters.
    // Another network with more advanced options... *** GANACHE ***     ganache: {     port: 7545,             // Custom port     network_id: 5777,       // Custom network     gas: 6721975,           // Gas sent with each transaction (default: ~6700000)     gasPrice: 20000000000,  // 20 gwei (in wei) (default: 100 gwei)     from: 0xAa8A9823D2b9CFB3AD0E2209Ed5A02E0afFA4c54,        // Account to send txs from (default: accounts[0])     websocket: true        // Enable EventEmitter interface for web3 (default: false)     } 
  • Migrations:
    • Blockchain is immutable, hence the code of the smart contracts. Every change has to be documented with migration scrips.
    • 1_blah: The number followed by an underscore determines the order of the migrations. The rest is for humans.
    • Truffle init creates a Migration contract and an initial migration script.
    • For our contract(s), we need to create (a) migration script(s).
    • See here for more on migration scripts.
  • truffle migrate <network_name>: Migrate (deploy) our contract(s) to specified network. For our case, the network name is ganache.
  • Confirm the transaction on the Blockchain via Ganache UI.

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