Table 2.

Cost analysis of the basic scheme.

Description	Deployment		Initial element		Other elements
	Gas	Cost(€)	Gas	Cost(€)	Gas	Cost(€)
1. New contract* per query request	157,274	1.20	–	–	–	–
2. Only one contract* using array with byte32 data types	254,614	1.94	105,894	0.81	75,894	0.58
3. Only one contract* using array with string data types	441,335	3.37	148,362	1.13	118,362	0.90

^*using 256-bits hash length