区块里的第一笔交易，为创币交易，用于发放矿工奖励及DPOS收益等The first transaction in the block is a Coinbase transaction, which is used to distribute miners’ rewards and DPOS profits, etc.
注册资产类别交易，主链只支持ELA资产类别RegisterAsset transaction. The main chain only supports ELA asset.
转账交易 ，output类别会区是否是投票交易TransferAsset transaction. Whether the output category area is a voting transaction
侧链挖矿交易，用于传递主链共识给POW侧链出块SideChainPow transaction, which is used to transfer the consensus of main chain to POW side chain of block generation.
主链无此交易，为与旧DID链交易类型保持一致定义在主链（旧did链上的跨链充值交易tx2）There is no such transaction in the main chain, which is defined in the main chain (cross-chain recharge transaction tx2 on the old DID chain) for keeping the same transaction type with the old DID chain.