August 2019
Intermediate to advanced
486 pages
13h 52m
English
Content preview from Mastering Blockchain Programming with Solidity
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Immutable code
Once you deploy your smart contract on Ethereum blockchain, either on the testnet or the mainnet, you cannot modify the code of the smart contract files that you have deployed. All code that is deployed becomes immutable. Not even an attacker/hacker can change the deployed code.
If your code is deployed on the testnet for testing purposes, then you can fix any issues in your smart contract files present on your local machine, and redeploy your code on the testnet again to check whether the functionality is working or not. But if you have deployed your contract on the mainnet (production) and other people, entities, or contracts started using that contract code, then you cannot change that contract code. If those entities are ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.