Table 8.

Blockchain and smart contract methodologies against threats/attacks.

Ref	Βrute Force	Hijacking	Alteration Attack	Jamming	DDoS	Man-in-the-Middle	51% Attack Resilience	Unlinkability	Intrusion Detection	Identity Authentication	User Account Management	Tracking Attack	Sybil Attack	Location Privacy Threats	Collusion Attack	Eavesdropping Attack
[44]	✓
[45]							✓
[46]		✓				✓	✓	✓
[47]												✓
[48]															✓
[49]			✓									✓		✓
[50]			✓	✓								✓
[42]										✓
[51]			✓												✓
[52]													✓
[53]											✓
[54]							✓
[55]		✓					✓
[56]	✓				✓					✓
[57]			✓
[58]						✓							✓		✓	✓
[59]					✓
[60]															✓
[43]			✓					✓		✓