where do stock brokers (such as robinhood, tdameritrade, etc) get their pricing data from?

So I've read of some cryptocurrency exchanges having their pricing oracles hacked, allowing someone to buy a cryptocurrency at a lower price or sell at a higher price than the reality is.

I've wondered, why hasn't that happened in the regular stock market?

submitted by /u/Panzercannon03
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from hacking: security in practice https://ift.tt/TZoGP29

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