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121 lines
2 KiB
Markdown
121 lines
2 KiB
Markdown
# Creating an Ethereum blockchain
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To create this blockchaon, we use [geth](https://geth.ethereum.org/), the official client software provided by the Ethereum Foundation written in the Golang.
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By default, geth implements [Clique](https://eips.ethereum.org/EIPS/eip-225#:~:text=Clique%20is%20a%20proof%2Dof,any%20client%20with%20minimal%20effort.), a proof-of-authority mechanism to reach consensus. Moreover, a number of accounts a defined to produce new blocks in the chain.
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A custom Ethereum testnet contains three components:
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* a custom [genesis file](/genesis.json
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* a custom data directory, which we define with `GETH_DATADIR`
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* a custom `NetworkID` , which we set `137`
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<br>
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### Gas
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Gas refers to the unit that measures the computational effort required to execute specific operations on the Ethereum network.
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<br>
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### Nodes
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Running nodes are responsible for the following tasks:
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- store blockchain data,
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- participates in block validation (verifying blocks and states),
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- serve the network and provides data on request.
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<br>
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### Storage
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More details to be added soon.
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<br>
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### Faucet
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More details to be added soon.
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<br>
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---
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## Interacting with the client
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You can run commands directly in the console:
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<br>
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##### Getting total coinbase
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```
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> web3.fromWei(eth.getBalance(eth.coinbase), "ether")
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```
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<br>
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##### Getting a balance from an account
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```
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> web3.fromWei(eth.getBalance("2ee8D80de1c389f1254e94bc44D2d1Bc391eD402"), "ether")
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```
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<br>
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#### txpool API
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Access to several non-standard RPC methods to inspect the contents of the transaction pool containing all the currently pending transactions as well as the ones queued for future processing:
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```
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txpool
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```
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<br>
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#### Other useful checks
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```
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admin.nodeInfo
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```
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<br>
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### Setting this chain on MetaMask
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Click a `Custom RPC` network and add:
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```
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Network Name: "<project name>"
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New RPC URL: localhost
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Chain ID: 137
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```
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<br>
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---
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## References
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* [geth commands](https://geth.ethereum.org/docs/interface/command-line-options)
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