Smart Contract Accounts and On-Chain Programmable Accounts

Creation and Execution of Contract Accounts

Contract accounts are generated differently from EOAs—they are created through transactions. When deploying a contract, the transaction contains the contract code and initialization parameters, which are recorded by on-chain nodes to generate a unique address.

When executing contract account logic, all operations are triggered by transactions that can originate from an EOA or another contract account. Nodes execute instructions line by line according to the smart contract code, modifying the on-chain state or calling other contracts.

Key features of this mechanism include:

• Automation: Executes preset logic without manual intervention
• Composability: Contracts can call each other, enabling complex on-chain applications
• Immutability: Code cannot be changed after deployment, ensuring rule consistency

In practice, the execution process of a contract account can be summarized as:

1. An EOA or contract account initiates a call transaction
2. The node reads the contract code and input data
3. Logic is executed and state is updated
4. The execution result is returned or an event notification is triggered

How Smart Contracts Control Assets and Logic

A contract account is not just a container for code—it also has asset management capabilities. All tokens and ETH received during deployment or execution belong to the contract account, with asset management fully governed by smart contract logic.

Through logic control, a contract account can enable:

• Automated payments and settlements
• Multi-signature or time-lock asset management
• Conditional fund transfers
• Interactions with other contracts to implement complex financial strategies

This programmatic control greatly reduces operational risks and provides flexible rule execution for on-chain financial applications.

Contract Account Applications in DeFi Protocols

In DeFi, nearly all core protocols rely on contract accounts to manage funds and logic. For example:

• Lending protocols: Lending pools, collateral management, and interest calculation are all handled by contract accounts
• Decentralized exchanges (DEX): Trade matching and liquidity pool management are automatically processed through smart contracts
• Yield aggregation strategies: Auto-compounding, yield distribution, and fee management are all managed by contract accounts

Contract accounts enable DeFi protocols to perform complex financial operations without centralized intermediaries, maintaining transparency, verifiability, and automated execution. This is the value of on-chain programmable accounts—they are not only tools for asset management but also the core infrastructure of decentralized finance.