Authors	Decentralized IoMT Data	Hyperledger Indy	WebAuthn	ZKP for IoMT Data	Blockchain Type	Smart Contract	Blockchain Stored Data	Access Control Method	Data Privacy	IPFS
Li et al. [27]	No	No	No	No	Private and Consortium	Yes	Encrypted health data	AC policies	Encryption	No
Zhang et al. [24]					Consortium		Relevant metadata	ABAC	Asymmetric encryption	Yes
Lin et al. [25]					Consortium		Encrypted index	CPRE	Encryption technology	No
Attia et al. [18]					Fabric		Medical device data	Not specified		No
Bai et al. [37]					Fabric		Other information	Proxy re-encryption		Yes
Abdelgalil and Mejri [11]					Indy and Fabric		Hash of EMRs and access control policy	ABAC
Sun et al. [19]					Ethereum		Hash of EMRs	ABE
Nguyen et al. [20]							Hash value is kept in the smart contract	Smart contract-based
Akkaoui et al. [21]							Hash value	RBAC
Dwivedi et al. [22]							Data hash	Hashing Encryption		No
Buccafurri et al. [23]							Hash value	ABE
A. Nassar et al. [30]					Not specified		Data in Ripple chain	Not specified	Hash-based data storage
Jamil et al. [32]							Vital sign	ACL rules	Encryption technology
Nie et al. [26]							Keyword ciphertext	KPABE
Liu et al. [35]						No	Reserve indexes of EMRs	Content extraction signature
Niu et al. [34]							EMR hash values	ABE
Dubovitskaya et al. [36]							Metadata and protocol for access control	RBAC
Chakraborty et al. [33]							Data hash	Not specified	Not specified
Kumar et al. [31]							Encrypted representation of medical records	Not specified	Data storage using hash functions	Yes
Proposed Solution	Yes	Yes	Yes	Yes	Hyperledgers Indy and Fabric	Yes	Hash of EMRs and secure access control of EMR collected from IoMT	ABAC	Encryption technology	Yes