Current blockchain systems have high requirements on network connection and data transmission rate, for example, nodes have to receive the latest blocks in time to update the blockchain, nodes have to immediately broadcast the generated block to other nodes for consensus, which restricts the blockchain to run only on real-time connection networks, but the existence of delay tolerant networks poses a great challenge to the deployment of blockchain systems. To address this challenge, a novel blockchain transaction mechanism is proposed. First, the block structure is modified by adding a flag, and on this basis, the definition of the extrachain is proposed. Secondly, based on the blockchain transaction process, transaction verification and consensus algorithms on the extrachain are presented. Thirdly, both the extrachain selection algorithm and appending algorithm are proposed, so that the extrachain can be appended to the blockchain fairly and safely. Finally, an extrachain transmission scheme is presented to broadcast the blocks generated in the delayed network to the normal network. Theoretical analysis and simulation experiments further illustrate the efficiency of the proposed mechanism.

中文翻译：

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延迟容忍网络中的区块链交易机制


当前的区块链系统对网络连接和数据传输速率有很高的要求，例如节点必须及时接收最新的区块来更新区块链，节点必须立即将生成的区块广播给其他节点以达成共识，这限制了区块链仅运行在实时连接网络上，但延迟容忍网络的存在对区块链系统的部署提出了巨大的挑战。为了应对这一挑战，提出了一种新颖的区块链交易机制。首先，通过添加标志来修改区块结构，并在此基础上提出额外链的定义。其次，基于区块链交易流程，提出了链外的交易验证和共识算法。第三，提出了额外链选择算法和追加算法，使得额外链能够公平、安全地追加到区块链上。最后，提出了一种链外传输方案，将延迟网络中生成的区块广播到正常网络。理论分析和仿真实验进一步说明了该机制的有效性。