Doubt related to Decentralized Oracle

[ghost]

We know that a decentralized oracle network is a group of independent blockchain oracles that provide off-chain data to a blockchain.

Now my doubt is,

• While fetching the data, will all the nodes in the decentralized oracle network fetch the same data and then check whether the data brought by each node are the same or will each node fetch different data and then aggregate those data in the blockchain?
• If each node is fetching different data, are all those fetched data related to each other for one particular transaction to occur over the blockchain network?

[jhonpedro]

We know that a decentralized oracle network is a group of independent blockchain oracles that provide off-chain data to a blockchain.

Now my doubt is,

• While fetching the data, will all the nodes in the decentralized oracle network fetch the same data and then check whether the data brought by each node are the same or will each node fetch different data and then aggregate those data in the blockchain?

• If each node is fetching different data, are all those fetched data related to each other for one particular transaction to occur over the blockchain network?

And how would all the nodes agree in a specific response if the value returned by the Oracle is in real time and it is very volatile?

[alymurtazamemon]

@edsondsouza Chainlink uses the same decentralized structure as blockchain but offline. To become a Chainlink's oracle node operator you need to deposit security fees in LINK tokens so you can get punished when you do fraudulent activities.

Each node collects data from different sources such coinmarketcap, coingecko, etc and passes the most appropriate data price to one of the offline lead nodes (they select one lead node offline to do this job, more details in the docs) and then the lead node collects all different prices, send back to alternative nodes to confirmation to correct prices and signatures to verify them (so the bad actors can be punished) and after confirmations, the lead node send the aggregated data to on-chain aggregator with all nodes signatures of verification.

The on-chain aggregator verifies it and records the price for that round.

Documentation is very well explained, I would recommend to should give it a read to clear all of these amazing questions.