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Stock trades are already decentralized. You can trade AAPL stock derivatives directly without using a blockhain or a stock exchange, so the blockchain part hasn't added anything useful to the transaction.

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That's just simply not true. Stock markets / futures markets are not decentralized in any sense of the word. You still require a 3rd party if you're going to trade derivatives over the counter.

Tell us how you can trade stock derivatives without a intermediary like a broker.

It's called OTC trading. It's been a thing for more than a century.

Blockchain trading is simply a dark pool with less protections, and dark pools have also been a thing in finance for decades.

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