Question 54: How is the security of smart contracts ensured in SCDO?

Answer: The security of smart contracts in SCDO is mainly ensured through platform mechanisms and developer practices. In terms of platform mechanisms, SCDO inherits the Ethereum verification execution model: contract code execution takes place within the EVM virtual machine, isolated from the underlying state, which prevents contracts from directly accessing off-chain systems and causing damage.

At the same time, each contract call has a Gas limit, and infinite loops or excessive computations will be safely terminated due to Gas exhaustion, preventing malicious contracts from blocking the network. Transaction and contract data is confirmed through consensus, irreversibly recorded on the chain, and contract results are transparent and publicly available, preventing unilateral tampering. Additionally, SCDO introduces some optimizations to enhance contract security: for example, regarding known vulnerabilities like the Ethereum DAO issue, developers can use currently mature versions of Solidity and security libraries to avoid reproducing past vulnerabilities.

SCDO may also provide contract templates and audit services for project parties to reference. On the other hand, security also depends on the developers themselves.

SCDO supports and encourages the use of audited open-source contract frameworks (such as the OpenZeppelin library) for development, and developers can utilize existing Ethereum security tools (such as MythX, Slither, and other static analysis tools) to review SCDO contracts, as both environments are similar. The community also advocates for third-party audits of important contracts. Although SCDO itself cannot prevent developers from writing vulnerable contracts, most common vulnerabilities can be avoided through a comprehensive development environment and accumulated experience.

In summary, the SCDO smart contract platform is secure and transparent in its underlying execution, while the specific contract security requires developers to follow best practices in conjunction with community oversight.