Table 5.

Payloads of transactions used in our prototype system

Payload	Content	Size
Payload of $T_{\mathrm{initialize}}^1$	A verification key	512 bytes
Payload of $T_{\mathrm{initialize}}^2$	3 IDs, 9 encrypted messages	960 bytes
Payload of $T_{\mathrm{initialize}}^3$	9 commitments	576 bytes
Payload of Trecord	1 to 7 arrays of spending data	128-896 bytes
Payload of Tquery	1 ID	32 bytes
Payload of Trespond	A hospital’s ID, a encrypted response, a commitment	192 bytes