Translations:Lightweight Contracts/240/en

One of the powerful features of Lightweight Contracts is their ability to interface with external systems to load data and register it on the blockchain and to save data to an external system based on blockchain data. Interfacing with external systems is a trade-off between decentralization and utility. There are cases where a specific contract runner can load data from an external system such as exchange rate or personal data that no other contract runner can validate. There is no choice for users but to trust the contract runner not to manipulate this data the same way users trust a centralized system. Still, once the data is registered on the blockchain, it is digitally signed and timestamped by the contract runner account and can no longer change. So as long as the contract runner is a trusted entity information provided by it can be used safely.