ChainID is another way to distinguish chains. So what is the Ethereum Chain ID and what does Chain ID mean exactly. Let’s find out by reading the article below.
What is the Ethereum chain ID?
The Ethereum network has two identifiers, the network ID and the chain ID. Although they generally have the same value, they serve different purposes. For most networks, including mainnet and public testnet, the network ID and chain ID are the same, and the network ID defaults to the chain ID, as specified in the genesis file.
Besu automatically sets the chain ID (the network ID by default) using the genesis-file option or when specifying a network with the network option. The table below lists the available networks along with their chains and network IDs.
The Chain ID for Ethereum is 1.
What does Chain ID mean?
The chain ID is a property of the chain managed by the node. It is used for replay protection of transactions. Setting the chain ID has the effect of changing one of the transaction parameters, the V parameter. The v parameter is set to 2*ChainID + 35/36. For the Ethereum mainnet with chain ID 1, this means that all transactions have a value of 37 or 38.
The chain ID set in the configuration section of the genesis configuration file is only used if the block number is higher than the block number set in eip155Block. See the GoQuorum example genesis file for an example. When the chain is below the eip155Block number and re-running geth init, you can change it as many times as you want this will not delete or modify any currently synced processes or saved blocks.
In GoQuorum, if the v parameter is set to 37 or 38, the transaction is considered private, which conflicts with the network with Chain ID 1. Therefore, GoQuorum will not run with chain ID 1, and will immediately exit a configuration if started in this way.
I hope this article will help you to learn what is the Ethereum Chain ID and what does Chain ID mean exactly. Make sure to do research if you are going to invest in.
