[Retracted] A Permissioned Blockchain-Based Clinical Trial Service Platform to Improve Trial Data Transparency

Table 1

Comparison with existing studies based on blockchain.

Name	Framework	Use of smart contract	Network type	Evaluation of security	Proof of concept
[44]	Bitcoin	N/A	Permissionless	No	No
[45]	Ethereum	Yes	Permissioned	No	No
[46]	Ethereum	Yes	Both	No	No
[47]	Ethereum	Yes	Permissioned	No	No
[48]	Bitcoin	Yes	Permissionless	No	No
[49]	N/A	No	Permissioned	Yes	No
Proposed approach	Hyperledger Fabric	Yes	Permissioned	Yes	Yes