## 7 Experiment and Analysis
### Evaluation of Multiple Incentive Mechanism  
Within the NexoNet, a significant portion of the incentive for users stems from the block transaction fee. Users earn PV through their participation in the system and use it to vote for maintainers. Being elected as a proposer enables them to receive a share of the transaction fee distribution, as delineated in Formula (8). The incentive distribution should reflect the idea that users with higher levels of participation receive greater rewards. This form of positive reinforcement aims to encourage active user participation within the system, fostering a vibrant and thriving BOSM. To evaluate the fairness of the transaction fee rewards obtained by users through the incentive mechanism, we conducted tests on the distribution of transaction fee to ascertain its fairness. The transaction fee in a block, determined by the proposer based on the pending transactions within the network, were assumed to be a fixed amount for each block during testing. All users randomly selected maintainers when voting, with each maintainer having an equal probability of being elected as a committee member or proposer. Assuming equal levels of participation among five user groups within the NexoNet, we observed the accumulation of transaction fee for each group, as shown in Figure 6a. The average \(PV\) for each group increases with each consensus round, with the cumulative change in the transaction fee depicted using different colored curves. It can be noted that among the five groups with equal participation, the average amount of the transaction fee accumulated by each group is quite similar, reaching approximately 2000 in the transaction fee after 1000 rounds of consensus. This demonstrates the fairness of the user incentive mechanism within the NexoNet, indicating that all users with the same level of participation can receive an equal amount of transaction fee rewards. Figure 6: The accumulation of transaction fee: (**a**) 5 user groups with equal levels of participation; (**b**) 5 user groups with different levels of participation. In Figure 6b, the same user grouping as in the last section is adopted. From the start of the test to the completion of 1000 rounds of consensus, the average transaction fee rewards for the five groups continuously accumulate upon joining the system. After 1000 rounds of consensus, from Group A to Group E, users have, respectively, accumulated average transaction fee rewards of 3483, 2718, 2009, 1454, and 337, with the accumulation of transaction fee rewards aligning with the participation levels of the respective groups. In the design of the multiple incentive mechanism, the higher the level of user participation, the greater the rewards obtained. However, there should be no distinction in the method of reward distribution among users based on the degree of participation; that is, the relationship between participation level and the amounts of rewards received should be linear. Therefore, this paper tests the transaction fee reward per \(PV\) (TpPv) of five user groups with different levels of participation, which represents the amount of the transaction fee reward obtained per unit of \(PV\) consumed by the user, serving as a measure of the fairness and decentralization of the incentive mechanism. If the average \(PV\) obtained by group \(i\) users over 1000 rounds of consensus is denoted as \(\overline{PV_{i}}\), and the total accumulated average transaction fee rewards as \(\overline{Tu_{i}}\), then the TpPv for this group of users in the NexoNet incentive mechanism can be calculated as  
\[TpPv_{i}=\frac{\overline{Tu_{i}}}{\overline{PV_{i}}} \tag{11}\]  
The average \(PV\) for Groups A to E were, respectively, 1842, 1384, 986, 781, and 176, summing to a total average \(PV\): \(\overline{PV_{all}}=\sum\overline{PV_{i}}=5169\).