# Smart Contract Development

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## 1.Development of smart contracts

Smart contracts are the core components of the SolSpider blockchain, directly affecting the protocol's operational logic, revenue distribution, and user interaction experience. Efficient and secure development of smart contracts is the key to protocol success.

**2.Write, test, and deploy smart contracts**

Writing:

The smart contract of SolSpider public chain is written in Rust on the Solana underlying blockchain. Rust is renowned for its high performance and memory security, ensuring the stability of contracts in high concurrency environments. In order to optimize execution efficiency, we extensively use compile time checks and static type analysis in the contract writing process to ensure the identification and correction of potential code defects during the compilation phase. In addition, we have implemented a modular development approach that decomposes contract logic into multiple functional modules for easy maintenance and expansion.

Testing:

The testing of smart contracts includes unit testing, integration testing, and end-to-end testing. Unit testing ensures that each functional module operates normally in an isolated environment, integration testing verifies the interaction between SSD modules, and end-to-end testing simulates real user operations to evaluate overall contract behavior. We use code coverage analysis tools during the testing process to ensure that all functional paths of the contract have been tested, thereby minimizing vulnerability risks to the greatest extent possible.

Deployment:

Before deploying the contract to the main network, the technical team first simulated the deployment on the test network, using Solana algorithm to observe the actual impact of contract execution on the blockchain. During the deployment process, we adopt a progressive deployment strategy, initially deploying contracts to a few nodes for real-time monitoring, and gradually expanding to more nodes after ensuring stable operation. To cope with unforeseen risks, SolSpider has designed an emergency stop mechanism. If significant vulnerabilities or attacks are detected, contract execution can be quickly suspended through pre-set governance processes to prevent further losses, 3. Contract security audit and vulnerability protection

Security Audit:

Security auditing is a necessary step to ensure that smart contracts are free from vulnerabilities and security risks. The SolSpider protocol adopts a multi round and multi-level security audit process, starting from internal code review within the team, and then being comprehensively audited by a third-party professional security company. The audit content covers business logic analysis, permission control checks, intrusion attack detection, integer overflow checks, etc. In addition, SolSpider uses formal validation tools to mathematically prove the core logic of the contract, ensuring that it meets design expectations.

Vulnerability protection:

To prevent potential attacks and vulnerabilities, SolSpider has implemented various protective measures. For example, to prevent re-entry attacks, the protocol uses function call checking and locking mechanisms to ensure that external contracts cannot trigger the execution of the same contract during their runtime. For integer overflow protection, SolSpider incorporates the SafeMath library to automatically detect and prevent overflow or underflow issues in numerical operations. For permission control, SolSpider implements a multi signature authorization mechanism that requires sensitive operations to be confirmed through multi signature, further enhancing the security of the contract.
