Blockchain with solidity 2

Using truffle framework and ganache-cli to create smart contract 🟥🟦.

Truffle is a framework for ethereum. It can be used to compile and migrate .sol files by truffle compile and truffle migrate. Running compile will create build folder where .json files of the compiled .sol files are stored. What is their function I don’t know.

The truffle migrate command will start migrating or creating the blocks. At first migration is deployed, initial_migration.js which starts at block 0 and add 1 block to it. Then HelloBlockchain is deployed, deploy_contracts.js which adds 3 block. For each deployment we get access to transaction hash, gas uses, balance, account and other information.

But before migration a running blockchain client is needed. ganache-cli is such a tool. It creates a local blockchain client to migrate and test ethereum blockchain. To create a client ganache-client has to run in terminal. Both ganache and truffle can be installed as npm package globally. The ganache-cli command will create 10 accounts with 100 ETH with private key and a mnemonic. the blockchain client is hosted at address 127.0.0.1:8545. Once ganache is running we can easily run migration and also tests in test folder by the command truffle test.