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Now in the Geth console type: personal.newAccount() After hitting ENTER a prompt will appear requesting a passphrase. This is the passphrase that will be used to perform any operations using this account. You can think of this as the passphrase required to decrypt the private-key used to sign Ethereum transactions. Do not leave the prompt empty, choose a simple passphrase for testing instead. A new Ethereum address will be returned by the function. If at any point you forget this address, you can list accounts by inspecting personal.listAccounts (it’s a variable, not a function, so don’t add () at the end). The geth console is a JavaScript interpreter. 2.3.1.3 3. Start mining some Ether Now it’s time to add some Ether to our new account. Ether is required to perform operations in the Ethereum blockchain, so it is necessary to perform this step. Ether can be gathered in two ways: by receiving it from another account or by mining it. Since this is a private network, we will need to mine it. Don’t worry, the private network is by default configured to be able to mine Ether easily. Let’s do it: miner.setEtherbase(personal.listAccounts[0]) // Hit ENTER miner.start() // Hit ENTER Now wait a few seconds (or minutes depending on your hardware) and then confirm you have some Ether in your account: eth.getBalance(personal.listAccounts[0]) // Hit ENTER 2.3.1.4 4. Compile and deploy our Login contract To simplify the process of compiling and deploying contracts, we will use truffle. Truffle is a development framework for Ethereum, simplifying many common tasks. Install it: npm install -g truffle Before using truffle to deploy contracts, it is necessary to “unlock” our account in our Ethereum node client. Unlocking is the process of decrypting the private-key and holding it in memory using the passphrase used to create it. This allows any client libraries (such as Truffle) connecting to the node to make operations on behalf of the unlocked account. Go to the geth console and type: personal.unlockAccount(personal.listAccounts[0]) // Hit ENTER Now switch to the solidity directory of our sample application. Edit the truffle.js file and set your newly created address as the from key. Then run: truffle migrate The migrate command compiles and deploys the contracts to the Ethereum network on behalf of the account set in truffle.js. As a result you will get the address of the newly deployed contract. Take note of it. 45PDF Image | Intro to Ethereum and Smart Contracts
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