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This is the main problem I see with smart contracts (Even with oracles?)... How do the nodes running the code all get the same response from an external data s

by edf13 9y ago

This is the main problem I see with smart contracts (Even with oracles?)... How do the nodes running the code all get the same response from an external data source? Even if they use a service such as oraclize if the contract calls https://api/query?param1 https://api/query?param1 and it returns lets say the weather: Node1 gets: 15.2c Node2 gets: 15.3c We've already failed on consensus haven't we?

DennisP 9y ago
The nodes don't all separately query the source. Instead, someone queries the source and sends a transaction to the network, with the data and the source's signature. The transaction gets incorporated into a block, updates the state, and now everybody has the same data.