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| Ref | Year of publication | Cloud-based | Policy-based | Blockchain-based | Is data storage off-chain considered | How access to data is managed? |
|
| [4] | 2019 | | X | | No | Access control rules are embedded in the smart contracts |
| [15] | 2018 | X | | | No | No |
| [16] | 2019 | X | | | Yes : authors use AWS managed services for this aim (S3, EHR, kinesis) | |
| [17] | 2019 | X | | | Based on edge/fog computing, authors propose a five-tier architecture where of them is dedicated meet storage requirements | No |
| [18] | 2017 | X | | | The proposed system benefits from the advantages of both the cloud computing and edge computing to manage IoT data | A constraints-based access control model is used |
| [19] | 2019 | X | | | The Heroku cloud server and Firebase Realtime database are used to fulfill storage requirements | No specific AC rules or model were mentioned |
| [20] | 2018 | | X | | No | Smart contracts are used to access control to accounts based on roles |
| [21] | 2018 | | X | | The “data storage layer” is dedicated to store the EHRs and its indexes through cloud storage service | Patients can define who are allowed to access medical data through smart contracts |
| [22] | 2019 | | X | | No | A data accessing token system is proposed allowing access control based on roles |
| [23] | 2019 | | X | | Patients’ health data is stored in IPFS storage system | Access is restricted via a fine-grained access control model |
| [24] | 2017 | | X | | No | No |
| [25] | 2019 | | X | X | No | Access policies are sent in the form of a transaction to cluster miners |
| [26] | 2017 | | | X | No | Role-based and attribute-based access controls models are both used |
| [27] | 2021 | | | X | No | No |
| [28] | 2018 | | | X | Traditional EHRs databases | A permission contract is proposed with various access levels |
| [29] | 2021 | | X | X | The proposed architecture involves an off-chain storage layer | Access is granted based on users’ role in the proposed system |
| [30] | 2021 | | X | X | No | A decentralized selective ring-based access control mechanism is introduced |
| [31] | 2020 | | | X | Data is stored in the off-chain storage framework using IPFS | Access control rules and permissions are managed using Hyperledger Composer |
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