Patient asks his cryptographic USB to create a key pair and attaches it to HAP

I.1 Patient $\to$ USB—Patient : HAP

I.2 USB—Patient $\to$ Patient : k₀

Patient provides his attributes to HAB and links them to k₀

I.3 Patient $\to$ HAP : k₀, $\left(a_1,{\upsilon }_1\right),\cdots ,\left(a_n,{\upsilon }_n\right)$

Patient saves in his Wallet information allowing to request his provides attributes

I.4 Patient $\to$ Wallet : HAP, $a_1,\cdots ,a_n$ , k₀

HAP protects and saves the values of collected attributes and their collection times in IPFS

I.5 HAP $\to$ IPFS : $\underset{F}{\underbrace{{\left\{\left(a_1,{\upsilon }_1,T_1\right),\cdots ,\left(a_n,{\upsilon }_n,T_n\right)\right\}}_k}}$

HAP saves in his database the location of attributes attached to k₀

I.6 HAP $\to$ HAP—DB : k₀, H(F), ${\left\{k\right\}}_{k_c}$