Smart Contract Issues [WIP]

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