Federated oracles is the answer you are seeking. Essentially build systems to quantify reputation and provide rewards for those that publish data of interest in

Federated oracles is the answer you are seeking. Essentially build systems to quantify reputation and provide rewards for those that publish data of interest in a manner that can be driven via consensus or through interfacing with an agreed upon central authority prior to a contract. You don’t “trust” the oracles you make them compete and avoid malicious actions. You are focused on off-chain interactions for smart contracts. The infrastructure is not there yet I’m afraid, but there is steady progress. I believe Taiwan is working on IoT infastructure for publishing high resolution air quality data by having individuals set up sensing nodes that gather the data and publish it. Not sure if there is any DLT involvement, but no reason there couldn’t be. On chain contracts have lots of use cases in the meantime.