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I have seen numerous examples of blockchain explorers providing information about the on chain activity of specific dApps. For example:

  • opencnft.io aggregates data about various token marketplaces
  • cexplorer.io has a list of the most active contracts and their associated dApps
  • eutxo.org provides information on transactions associated with a specific dApp

How do all of these sites map smart contracts / script addresses to a specific dApp? Do they manually determine which smart contracts a dApp is using or is this info listed somewhere?

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  • I could not even begin to guess how they are doing this. Instead I suggest you ask the people working on those sites. Jul 20, 2022 at 6:38
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    One way of determining it is to interact with such a dApp and follow the money.
    – Fermat
    Jul 20, 2022 at 10:29

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Do they manually determine which smart contracts a dApp is using or is this info listed somewhere?

Yes, they manually gather the data of which script hash belongs to which dApp. This information is not registered anywhere on the blockchain or in any official central place.

There are many ways to gather this information, as suggested in the comments you could use the dApp yourself and check the resulting Tx or simply ask the developers.

If you want to build a new app you could of course also scrape the data from other existing sources like the websites you have listed above.

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