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>There are some protocols emerging which lets you keep ownership of your coins and still lending them out.

how is it possible? When you lend your assets, someone can give it to other person. You cannot keep ownership of something others control?

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Overcollaterization and multi-sig. For example on HodlHodl you can lend USDC where the borrow posts more collateral than the loan. The lender, borrower, and HodlHodl each own one key in a 2-of-3 multi-sig. If there's a dispute then HodlHodl will resolve it.

I believe he might be referring to flash loans, essentially the borrowed money is returned to you within the same transaction that borrowed it + interest.

I don't agree with calling flash loans loans. Money isn't borrowed, as you don't posses them even for a second. Instead it's more like "offer me an atomic transaction that will make me money, and I will run it with my liquidity". See: i'm not giving you my liquidity, i merely choose to use your strategy which is atomic, and you cannot change your mind and steal the money halfway (as in borrowing).

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