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But if you don’t follow the rules and you only want to read, hopefully this helps give a perspective of starting with nothing and ending with a blockchain app.
By the end, you’ll have started a local private Ethereum blockchain, connected two different nodes as peers, written and compiled a smart contract, and have a web interface that allows users to ask questions, deploy the questions on the blockchain, and then lets the users answer.
To create a single node, we need the following –datadir specifies where we want the all the data for the blockchain to be located. Since we have multiple nodes running, we can’t have them sharing the same data folder, so we’re going to specify.
Linux and Windows machines have different default datadirs, so take a look at those to see in general where they should be located.
For blockchains to become peers, we need them to have the same genesis file.
So we’re going to run the same command as above, from the same directory, but this time with a different With all the code here, we’re going to be working in the same directory.
Then I check the balance again and it knows it has 100000000 Wei. We’ve worked in a terminal having a private Ethereum blockchain running locally, two nodes that have accounts, are peers with each other, and can send transactions back and forth. With the nodes running, the next step is getting into contracts.
That’s pretty good, so if you want to take a second to calm down and get a slightly better understanding, go ahead. When writing posts like this, it takes a long time to pick a simple yet worthwhile example.
Right below that is the web3 deploy information which is exactly what we’re going to mimic! Here, we’ll be seeing the word “node” again, but when you see the capital N, we mean Node JS. Deploying Question Preface, before going into blockchains I hadn’t used Node in forever, so some of the syntax and practices might be off here.
The code is the same, but with the command line options, we’ll be able to separate these processes by the command line arguments. We don’t want nodes to try to connect to other nodes without me specifying, and we don’t want these nodes to be discovered without us telling them. So if you’re still curious how the data is stored in your filesystem, go checkout the directory now.
file in a working directory of your choosing, 2) picked a directory to store the blockchain for one node and initialized the first block, and 3) picked a different directory to store the blockchain for the other node. file, where all we want here is to make sure we’re not using network ids 1-4. That’s the way we’ll connect with the database using the web3library. We have multiple nodes running, and we’ll need to connect them as peers. This tells one node how to get to the other node, will ask the other node to link up, and they’ll both become each other’s peers.
And that was the case for me when trying to pick a type of contract to use.
The one I decided to throw in here is one where people are able to answer yes / no, or true / false questions.
This is necessary so we’re not impersonating someone else.