Table 4.
Transaction structure for electronic medical record (EMR) sharing.
| Field | Definition |
| User ID | IDs of the patient and physician |
| Timestamp | Time the transaction was created |
| EMR information | Summary of information in the EMR |
| Metadata | Hash value of encrypted EMR |
| Contract code | Patient’s defined access permission policy |
| Signature | Signing with the user’s private key |