From the course: Building an Ethereum Blockchain App: 1 Introduction to Blockchain

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Building the blockchain story

Building the blockchain story - Ethereum Tutorial

From the course: Building an Ethereum Blockchain App: 1 Introduction to Blockchain

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Building the blockchain story

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- So now you have a handle on a few things, blockchain related. Number one, data on the blockchain can only be added, and added and added and added and added. And read. You can't do anything else with it. Number two, you can't change any data on the blockchain, which means it's essentially immutable. Now, technically you can change it, but it's really, really, really easy to figure that out and it invalidates the blockchain, which means it's just no longer in use. And number three, it's immutable because there are multiple nodes that have to agree on any changes, and it's very easy for those nodes to detect any unauthorized changes. All right. So let's start back with that lawn mowing transaction and pair it down to just the money changing hands. In reality, on real blockchain applications, you're probably going to be storing more data than just the transaction, but let's keep it simple. Julie paid me…

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