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Morden is a public Ethereum alternative testnet. It is expected to continue throughout the Frontier and Homestead milestones of the software. This is supported natively on 0. Pass the --morden argument in when starting any of the clients. It is possible to connect to or create a new network by using the —genesis and —config. In that case, the genesis block description provided by —config will be overwritten by the —genesis option.
You either pre-generate or mine your own ether on a private testnet. It is a much more cost effective way of trying out Ethereum and you can avoid having to mine or find Morden test ether.
The genesis block is the start of the blockchain - the first block, block 0, and the only block that does not point to a predecessor block. Save a file called CustomGenesis. You will reference this when starting your geth node using the following command:. By default geth will use the same directory for network related files as for the public mainnet.
We already covered the genesis flag, but we need a few more. Note that all of the commands below are to be used in the geth Ethereum client. Use this to make sure that your node is not discoverable by people who do not manually add you. Use maxpeers 0 if you do not want anyone else connecting to your test chain.
Alternatively, you can adjust this number if you know exactly how many peers you want connecting to your node. By default, Geth enables the web3 interface over RPC.
This is the data directory that your private chain data will be stored in under the nubits. Choose a location that is separate from your public Ethereum chain folder.
This will set up an identity for your node so it can be identified more easily in a list of peers. Here is an example of how these identities show up on the network. After you have created your custom genesis block JSON file and created a directory for your blockchain data, type the following command into your console that has access to geth:. You will need to start your geth instance with your custom chain command every time you want to access your custom chain.
The full list of methods available through the javascript console is available on the geth wiki on github. If you create your chain and start mining, you should have hundreds of ether in a matter of minutes which is way more than enough to test transactions on your network.
If you would still like to pre-allocate Ether to your account, you will need to:. Replace 0x1fbf92ebf4dd0d7cb5a with your account address. Save your genesis file and rerun your private chain command. Once geth is fully loaded, close it by. We want to assign an address to the variable primary and check its balance. Run the command geth account list in your terminal to see what account your new address was assigned. Take note of which account is the one that you pre-allocated ether to.
Alternatively, you can launch the console with geth console keep the same parameters as when you launched geth first. Once the prompt appears, type. This console command should return your primary Ethereum address. This should return 7. Genesis generic block hash: Use the Ethereum wei faucet. It is possible to use both —config and —genesis. The things that are required to specify in a private chain are: Note By default geth will use the same directory for network related files as for the public mainnet.
This is generally enabled by default in Geth. The default for geth is Note Please change the flags to match your custom settings. Note Replace with the password of your choice. If you would still like to pre-allocate Ether to your account, you will need to: Note Replace 0x1fbf92ebf4dd0d7cb5a with your account address. Read the Docs v: