Ref: Blockchain Based Smart Contracts : A Systematic Mapping Study (Maher Alharby and Aad van Moorsel)
Smart contract issues
Codifying issues
- Difficulty of writing correct smart contracts
- Inability to modify or terminate smart contracts
- Lack of support to identify under-optimised smart contracts
- Complexity of programming languages
Security issues
- Transaction-ordering dependency vulnerability
- Timestamp dependency vulnerability
- Mishandled exception vulnerability
- Re-entrancy vulnerability
- Criminal smart contract activities
- Lack of trustworthy data feeds ‘Oracles’
Privacy issues
- Lack of transactional privacy
- Use of ‘Hawk’ tool
- Lack of data feeds privacy
Performance issues
Sequential execution of smart contracts