*Perspective Chapter: Blockchain-Enabled Trusted Longitudinal Personal Health Record DOI: http://dx.doi.org/10.5772/intechopen.106454*

**Figure 4.** *Secure private key recovery.*

When the BET-LPHR owner lost the secure private key ð Þ *SecPrivKey* , there are two scenarios for the BET-LPHR owner to recover the key (**Figure 4**):


**When** Key\_Admin write to Joyce\_Taylor\_Encrypted\_Secure\_Private\_Key **do**

Create u\_deny (Key\_Admin) read from Joyce\_Taylor\_Encrypted\_Secure\_Private\_Key Create u\_deny (Key\_Admin) assign to Joyce\_Taylor\_Admin\_Patient\_Key\_Recovery

Create u\_deny (Key\_Admin) assign to Joyce\_Taylor\_Key\_Selft\_Recovery

**When** Key\_Admin write to Joyce\_Taylor\_Recovery\_Private\_Key **do**

Create u\_deny (Key\_Admin) read from Joyce\_Taylor\_Recovery\_Private\_Key

Create u\_deny (Key\_Admin) assign to Joyce\_Taylor\_Admin\_Patient\_Key\_Recovery

Create u\_deny (Key\_Admin) assign to Joyce\_Taylor\_Key\_Selft\_Recovery

**When** Joyce\_Taylor proves identity, **do** assign Joyce to Joyce\_Taylor\_Admin\_Patient\_Recovery
