hyperledger leader peer endorsing peer committing peer
leader peer 是peer之間動態選舉選出的
endorsing peer 預設為每個peer都是,安裝chaincode後,實例化設定policy可以有變化
committing peer 預設為每個peer都是
https://medium.com/@kctheservant/transactions-in-hyperledger-fabric-50e068dda8a9
https://stackoverflow.com/questions/52893818/difference-between-endorsing-peer-and-committing-peer-in-hyperledger-fabric/52894994