# Special Equipment Safety Supervision System Architecture Based on Blockchain Technology
## 3 Methods  
### Using Blockchain Technology  
The specific requirements for improving the safety supervision system of special equipment proposed in Part 2 can be summarized into four parts: efficient accident responsibility tracing, more transparency, more efficient data sharing, and integrating more functions. The methods proposed in existing research cannot meet such complex and extremely challenging requirements. Fortunately, blockchain technology, including distributed ledger technology, transparency, and sharing mechanism, provides the possibility to address these problems. Therefore, we design a new system based on the combination of permissioned blockchain technology and safety supervision work.  
We can regard the \"transaction\" in the blockchain as the update of supervision information. When users update their work information, they are building blocks. In this way, all the work information of participants in the supervision system will be recorded in a digital ledger composed of many blocks, and this is an unalterable distributed ledger. As can be seen in Figure 2, the ledger is jointly managed by all participants and each participant has a copy of the ledger, which makes the ledger instinctively trusted by all participants. The hash pointer described in Figure 2 plays an important role in the blockchain. Once the information in one block is rewritten, its hash value will change and be disconnected from the next block, because each block contains the hash value of the previous block, which makes the supervision work data in the block unalterable.  
\begin{table}
\begin{tabular}{l l l} \hline \hline
**Requirements** & **Related Supervision Problems** & **Reference Source** \\ \hline \multirow{8}{*}{Efficient accident responsibility tracing} & The primary supervisors become scapegoats after the accident; & \\  & The primary supervisor’s fatigue and inefficiency; & \\  & The trust crisis among various roles in the supervision system; & \\  & The equipment users collide with the inspection agency to conceal safety risks & \\  & of the equipment; & \\  & Potential safety risks are covered by equipment users in safety management; & \\  & The inspection agencies are slack in inspection work; & \\  & The corruption between the primary supervisor and those they supervise & \\ \hline \multirow{2}{*}{More efficient data sharing} & Delayed and high technical requirements of data sharing & [45] \\  & Equipment user’s distrust about inspection results & \\ \hline \multirow{2}{*}{More transparent supervision information} & The supervision information is seriously interfered with by interpersonal & \\  & relationships, resulting in low supervision efficiency & [46] \\ \hline \multirow{2}{*}{Integrating more functions into the safety supervision system} & The work of license approval is inefficient & [47] \\ \hline \hline \end{tabular}
\end{table}
Table 1: Requirements for improving the safety supervision system of special equipment.  
Therefore, the safety supervision system of special equipment based on this digital ledger can develop a fair and efficient accident responsibility tracing function, and ensure the transparency and efficient data sharing of the system.