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I would like to recreate compound.finance as a project but I don't really understand the architecture. Their white paper of website wasn't really helpful in this matter.

When I want to borrow I first have to add tokens that can be used as a collateral.

Then I can borrow but which contract stores the collateral? Is it the Comptroller or cToken contract?

Thanks

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cToken is the address that is holding the underlying asset, u can check that by checking lets say DAI, DaiContractAddr.balanceOf(cToken)

Here is where user transfer their collateral to cToken address

https://github.com/compound-finance/compound-protocol/blob/master/contracts/CErc20.sol#L156

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