Ensure that the accounts are unlocked and coinbase is set correctly.
First list the accounts, by using the following command, which outputs the account 0, as shown: > personal.listAccounts[0] “0xcf61d213faa9acadbf0d110e1397caf20445c58f” Now unlock the account using the following command.
Building Decentralized Applications from Scratch (Part 2)
It will need the passphrase (password) that you used originally when creating this account.
The Web3 deployment script The Web3 deployment script is shown in the following code snippet: var valuecheckerContract = web3.eth.contract([{“constant”:false,”inputs”:[{“name”:”x”,”type”:”uint8″}],”name”:”Matcher”,”outputs”:[{“name”:””,”type”:”bool”}],”payable”:false,”stateMutability”:”nonpayable”,”type”:”function”},{“anonymous”:false,”inputs”:[{“indexed”:false,”name”:”returnValue”,”type”:”bool”}],”name”:”valueEvent”,”type”:”event”}]); var valuechecker = valuecheckerContract.new( from: web3.eth.accounts[0], data: ‘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’, gas: ‘4700000’ }, function (e, contract){ console.log(e, contract); if (typeof contract.address !== ‘undefined’) { console.log(‘Contract mined! address: ‘ + contract.address + ‘ transactionHash: ‘ + contract.transactionHash); }) 5. Ensure that the accounts are unlocked and coinbase is set correctly. First list the accounts, by using the following command, which outputs the account 0, as shown: > personal.listAccounts[0] “0xcf61d213faa9acadbf0d110e1397caf20445c58f” Now unlock the account using the following command. It will need the passphrase (password) that you used originally when creating this account. Enter the password to unlock the account:
Why This Matters for Blockchain Technology
Understanding The Web3 deployment script is not just an academic exercise — it has real-world implications for how blockchain systems are designed, deployed, and secured. Whether you are a developer building decentralized applications, a business leader evaluating blockchain adoption, or a curious learner exploring the technology, this knowledge provides a critical foundation.
Key Points to Remember
- Ensure that the accounts are unlocked and coinbase is set correctly.
- First list the accounts, by using the following command, which outputs the account 0, as shown: > personal.listAccounts[0] “0xcf61d213faa9acadbf0d110e1397caf20445c58f” Now unlock the account using the following command.
- It will need the passphrase (password) that you used originally when creating this account.
Conclusion
The Web3 deployment script represents one of the many innovative layers that make blockchain technology so powerful and transformative. As distributed systems continue to evolve, a solid understanding of these core concepts becomes increasingly valuable — not just for developers, but for anyone building, investing in, or working alongside blockchain-powered systems.
Whether you are just starting your blockchain journey or deepening existing expertise, mastering these fundamentals gives you the tools to think clearly about decentralized systems and make smarter decisions in this rapidly evolving space.