Definition ∞ A singleton contract is a smart contract designed to have only one instance deployed on a blockchain. This architectural pattern ensures that a specific set of functionalities or a particular data store exists as a unique, globally accessible resource within the blockchain ecosystem. It prevents the deployment of multiple, conflicting versions of the same core logic or state, maintaining consistency and simplifying interactions for other contracts and users. Singleton contracts are often employed for critical infrastructure components, such as registry services or central governance modules.
Context ∞ Singleton contracts are a common design pattern in blockchain development, especially for core components of decentralized applications (dApps) and protocol infrastructure. News and technical discussions often refer to their role in ensuring canonical versions of essential services and preventing fragmentation. The security and upgradeability of singleton contracts are paramount, as any vulnerability or flaw could have widespread implications across dependent protocols.
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