Searchable Blockchain-Based Healthcare Information Exchange System to Enhance Privacy Preserving and Data Usability

. 2024 Feb 29;24(5):1582. doi: 10.3390/s24051582

Algorithm 1 EHR Generation

Require:
Collected Health Information $H I$
Ensure:
Electronic Health Record $E H R$ and Blockchain EHR Block $B l o c k_{E H R}$
1:
$E H R \leftarrow \emptyset$
2:
$B l o c k_{E H R} \leftarrow {H e a d e r, B o d y}$
3:
$H e a d e r \leftarrow {H a s h_{p r e v}, T i m e s t a m p, M e r k l e R o o t (E H R)}$
4:
$B o d y \leftarrow \emptyset$
5:
for $H I_{i} \in H I$ do
6:
$E H R \leftarrow E H R \cup {H I_{i}}$
7:
end for
8:
for $(a t t r i b u t e, v a l u e) \in E H R$ do
9:
$a t t r i b u t e_{h a s h} \leftarrow H a s h (a t t r i b u t e)$
10:
$v a l u e_{h a s h} \leftarrow H a s h (v a l u e)$
11:
$h a s h_{p a i r} \leftarrow H a s h (a t t r i b u t e_{h a s h}, v a l u e_{h a s h})$
12:
$s i g n a t u r e \leftarrow S i g n (h a s h_{p a i r}, S K_{u s e r})$
13:
$B o d y \leftarrow B o d y \cup {(h a s h_{p a i r}, s i g n a t u r e)}$
14:
end for
15:
$B l o c k_{E H R} \leftarrow {H e a d e r, B o d y}$
16:
Broadcast $B l o c k_{E H R}$ to Blockchain Network
17:
Store $E H R$ in Personal Storage