有两种以太坊客户端可以选择：
- Eth – C++ implementation
- Geth – Go implementation
本教程是基于Geth. 安装教程可以到 frontier gitbook.
创建创世块
创世块的最大特点是第一个块，所以没有与之前的块产生联系。在比特币系统里，这个创世块是被写入源码，但对于以太坊而言，创世块可以是任何你喜欢的东西。你也可以把这个当成是系统的一个漏洞。但是共识算法确保其它人除非纳入你的创世块，否则是不会有效的。（以后再详细说）
Great, so how do we make one of these genesis blocks? Well its fairly simple the following JSON is all you really need:
[code]{
“nonce”: “0xdeadbeefdeadbeef”,
“timestamp”: “0x0”,
“parentHash”: “0x0000000000000000000000000000000000000000000000000000000000000000”,
“extraData”: “0x0”,
“gasLimit”: “0x8000000”,
“difficulty”: “0x400”,
“mixhash”: “0x0000000000000000000000000000000000000000000000000000000000000000”,
“coinbase”: “0x3333333333333333333333333333333333333333”,
“alloc”: {
}
}[/code]
Kudos to obscuren
在本地硬盘上存储这个 JSON，然后运行以下命令：
[code]$ geth –genesis –datadir –networkid 123 –nodiscover –maxpeers 0 console[/code]这个命令做了如下几个事情：
- 调用创世块JSON进区块链里。
- 使用 datadir 来存储相关数据，并且维护新创建的区块及其它数据 (declared to prevent you clobbering your main net data, wouldn’t want to overwrite all those blocks you spent time downloading!)
- 使用网络ID ‘1’ 确保我们无法与主网的节点进行通讯。 – “connections between nodes are valid only if peers have identical protocol version and network id”
- 禁用同伴发现。
- 把maxpeers 设置为 0禁用网络。
- 以控制台模式启动 geth客户端，这样你就可以与你的新区块链接/节点进行通讯。
接下来就可以根据 testing contracts and transactions 的指示创建区块和帐户了。我这里的区别是禁用了PRC, 表现证明的公认搜集过程( the proof performance metric gathering processes) ，extra verbosity and vmdebu，目的是简单化。
在上述创世块里，我把难度设置的很低，这样的话我的本地电脑就能够挖矿，很容易获得以太币。
种子帐户 accounts with allocation
接下来，就有必要创建新的种子帐户了（以便存储挖矿所得的以太币）。 很简单，先创建一个新区块链和新帐户:
[code]$ geth –genesis –datadir /…/dapps/test-genesis/.ethereum –networkid 123 –nodiscover –maxpeers 0 console
I0829 13:30:07.340636 3987 database.go:74] Alloted 16MB cache to /…/dapps/test-genesis/.ethereum/blockchain
I0829 13:30:07.342982 3987 database.go:74] Alloted 16MB cache to /…/dapps/test-genesis/.ethereum/state
I0829 13:30:07.345055 3987 database.go:74] Alloted 16MB cache to /…/dapps/test-genesis/.ethereum/extra
I0829 13:30:07.347363 3987 backend.go:291] Protocol Versions: [61 60], Network Id: 12345
I0829 13:30:07.347738 3987 backend.go:303] Successfully wrote genesis block. New genesis hash = 82b6159155c00fb0b420046012a02257a176ad5dcfce4be4a15da39c166518e2
I0829 13:30:07.347771 3987 backend.go:328] Blockchain DB Version: 3
I0829 13:30:07.347866 3987 chain_manager.go:241] Last block (#0) 82b6159155c00fb0b420046012a02257a176ad5dcfce4be4a15da39c166518e2 TD=1024
I0829 13:30:07.353373 3987 cmd.go:124] Starting Geth/v1.0.1/darwin/go1.4.2
I0829 13:30:07.353470 3987 server.go:312] Starting Server
I0829 13:30:07.353610 3987 backend.go:564] Server started
I0829 13:30:07.353548 3987 server.go:549] Listening on [::]:30310
I0829 13:30:07.353961 3987 ipc_unix.go:78] IPC service started (/…/dapps/test-genesis/.ethereum/geth.ipc)
instance: Geth/v1.0.1/darwin/go1.4.2
datadir: /…/dapps/test-genesis/.ethereum
coinbase: 0x1fb891f92eb557f4d688463d0d7c560552263b5a
at block: 0 (1970-01-01 01:00:00)
modules: admin:1.0 db:1.0 debug:1.0 eth:1.0 miner:1.0 net:1.0 personal:1.0 shh:1.0 txpool:1.0 web3:1.0
> personal.newAccount(“mypassword”);
‘0x1fb891f92eb557f4d688463d0d7c560552263b5a'[/code]
上面代码的最后一行创建了一个新的帐户，其地址是 0x1fb891f92eb557f4d688463d0d7c560552263b5a.
创建帐户后，用 退出geth客户端，然后在你的datadir文件夹里，保留 keystore/ 这个文件夹，其余的全部删掉。
[code]$ cd
$ rm -rf `ls | grep -v keystore`[/code]接下来就是见证奇迹的时候，刷新你的创世块JSON，把下面的代码加入 alloc 键:
[code]”alloc”: {
“”: {
“balance”: “10000000000000000000”
}
}[/code]现在重新运行geth命令行，使用刚才刷新过的 genesis json文件，还有相同的datadir，然后你会发现帐户余额里，多了10个以太币出来。
[code]$ geth –genesis –datadir /…/dapps/test-genesis/.ethereum –networkid 123 –nodiscover –maxpeers 0 console
I0829 13:30:07.340636 3987 database.go:74] Alloted 16MB cache to /…/dapps/test-genesis/.ethereum/blockchain
I0829 13:30:07.342982 3987 database.go:74] Alloted 16MB cache to /…/dapps/test-genesis/.ethereum/state
I0829 13:30:07.345055 3987 database.go:74] Alloted 16MB cache to /…/dapps/test-genesis/.ethereum/extra
I0829 13:30:07.347363 3987 backend.go:291] Protocol Versions: [61 60], Network Id: 12345
I0829 13:30:07.347738 3987 backend.go:303] Successfully wrote genesis block. New genesis hash = 82b6159155c00fb0b420046012a02257a176ad5dcfce4be4a15da39c166518e2
I0829 13:30:07.347771 3987 backend.go:328] Blockchain DB Version: 3
I0829 13:30:07.347866 3987 chain_manager.go:241] Last block (#0) 82b6159155c00fb0b420046012a02257a176ad5dcfce4be4a15da39c166518e2 TD=1024
I0829 13:30:07.353373 3987 cmd.go:124] Starting Geth/v1.0.1/darwin/go1.4.2
I0829 13:30:07.353470 3987 server.go:312] Starting Server
I0829 13:30:07.353610 3987 backend.go:564] Server started
I0829 13:30:07.353548 3987 server.go:549] Listening on [::]:30310
I0829 13:30:07.353961 3987 ipc_unix.go:78] IPC service started (/…/dapps/test-genesis/.ethereum/geth.ipc)
instance: Geth/v1.0.1/darwin/go1.4.2
datadir: /…/dapps/test-genesis/.ethereum
coinbase: 0x1fb891f92eb557f4d688463d0d7c560552263b5a
at block: 0 (1970-01-01 01:00:00)
modules: admin:1.0 db:1.0 debug:1.0 eth:1.0 miner:1.0 net:1.0 personal:1.0 shh:1.0 txpool:1.0 web3:1.0
> primary = eth.accounts[0];
‘0x1fb891f92eb557f4d688463d0d7c560552263b5a’
> balance = web3.fromWei(eth.getBalance(primary), “ether”);
’10′[/code]
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