## 5 Results and Evaluation
### Energy Consumption Data Evaluation  
The comparison of blockchain algorithms' power consumption is highly significant for health sensor networks. Most medical IoT devices and sensor networks are battery-powered devices and are expected to survive for extended periods without battery replacement [41]. Therefore, battery consumption is an important parameter for blockchain energy consumption analysis. Figure 14 shows the energy consumption of the Hydrachain blockchain algorithm in Raspberry Pi 3B devices.  
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Blockchain Node** & **Hydrachain** & **Monero** & **Duino Coin** \\ \hline Node 01 & 65.49 \({}^{\circ}\)C & 59.68 \({}^{\circ}\)C & 82.85 \({}^{\circ}\)C \\ \hline Node 02 & 66.32 \({}^{\circ}\)C & 59.14 \({}^{\circ}\)C & 83.28 \  
As Figure 14 indicates, blockchain nodes consumed 281 mW to 282 mW while running the Hydrachain blockchain algorithm. Additionally, as Figure 15 indicates, the mean Hydrochain blockchain power consumption deviates from 281 mW to 282 mW.  
As an example, the fourth blockchain node of Hydrochain has a mean power consumption of 281 mW. We used 9 V batteries to power the microcontroller devices and 9 V batteries containing 550 mAh. This means a 9 V battery can power up the blockchain node for up to 1.95 h continuously.  
Figure 16 shows the power consumption of the Monero blockchain algorithm. According to Figure 16, the power consumption of the Monero blockchain algorithm deviates from 266 mW to 268 mW. As Figure 16 indicates, the Monero blockchain algorithm consumes a small amount of energy compared to the Hydrochain blockchain algorithm.  
Figure 14: Hydrochain blockchain power consumption.  
Figure 15: Hydrochain blockchain mean power consumption.  
Figure 17 shows the mean Monero power consumption of the blockchain nodes. According to Figure 17, a 9 V battery can power a blockchain node for 2 h.  
Figure 17. Monero blockchain mean power consumption.  
Figures 18 and 19 show the power consumption of the Duino coin blockchain algorithm.  
According to Figure 18, the power consumption of the Duino coin blockchain algorithm deviates from 340 mW to 342 mW. Additionally, Figure 19 shows the mean power consumption of the Duino coin blockchain algorithm. According to Figure 19, the mean power consumption is 341 mW.  
A 9 V battery only can provide power to a Duino coin blockchain node for up to 1.6 h. As the Duino Coin energy consumption graphs show, the power consumption of the Duino coin blockchain algorithm is significantly higher than that of the Monero and Hydrachain blockchain algorithms [(42)].  
Figure 20 shows us the average power consumption summary of three blockchain algorithms. According to Figure 20, the Duino coin blockchain algorithm recorded the highest power consumption, and the Monero blockchain algorithm recorded the lowest.  
Additionally, Table 2 presents an overall summary of the mean power consumption of the Hydrachain, Monero and Duino coin blockchain algorithms [43].  
Based on the analysed blockchain power consumption variations, we can emphasise that the Monero blockchain algorithm consumes the least energy, compared to Hydrachain and Duino coin algorithms, in a wireless sensor network environment. The results of Table 2 show the different power consumption levels of each node [44]. This indicates that the energy consumption of blockchain networks can be changed. The block transmission rate, block exchange periods, and hardware CPU core level performance are possible reasons for the different energy consumption levels [45]. Additionally, we can highlight that the average temperature levels and average energy consumption summaries are correlated. In the next chapter, we discuss our conclusions and possibilities for future research.  
Figure 19: Duino coin blockchain mean power consumption.  
Figure 18: Duino coin blockchain power consumption.