区块链技术从1.0时代以比特币为代表的数字化支付；到2.0时代以太坊为代表，数字支付和智能合约相结合；至今3.0时代，超出金融领域，为各行各业提出去中心化解决方法。
国家也提出以联盟链为发展方向进军区块链世界。
区块链所需要的环境配置好以后，接下来内容均为个人开发记录，仅供参考。（geth 客户端、web3j.py 交互、python开发使用）
初始化创世区块
1 { 2 "config": { 3 "chainId": 666, 4 "homesteadBlock": 0, 5 "eip150Block": 0, 6 "eip150Hash": "0x0000000000000000000000000000000000000000000000000000000000000000", 7 "eip155Block": 0, 8 "eip158Block": 0, 9 "byzantiumBlock": 0, 10 "constantinopleBlock": 0, 11 "petersburgBlock": 0, 12 "istanbulBlock": 0, 13 "ethash": {} 14 }, 15 "nonce": "0x0", 16 "timestamp": "0x5ddf8f3e", 17 "extraData": "0x0000000000000000000000000000000000000000000000000000000000000000", 18 "gasLimit": "0x47b760", 19 "difficulty": "0x00002", 20 "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000", 21 "coinbase": "0x0000000000000000000000000000000000000000", 22 "alloc": { }, 23 "number": "0x0", 24 "gasUsed": "0x0", 25 "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000" 26 }