Why need the Retrieval Miners?

I think the clients can check if the storage miners is storing the stored data by himself.

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I have been wondering this too, and would love an authoritative answer.

If you read the white paper [1], specifically section 5.3.1, it discusses how retrieval cannot be handled on-chain because the chain would create a bottleneck for retrieval. So, I’m assuming that is the main reason for a retrieval market. As for why clients cannot function as their own retrieval miners, I am not clear on this part. They obviously can, but maybe the issue is that it’s a lot of work and therefore they may not want to?

[1] http://dl.icdst.org/pdfs/files3/d171afc1e977f246c7f715add2a2db19.pdf