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Is it possible to detect inside contract that the nft was sold through opensea or that it was a simple transfer? Are there any methods without oracles?

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A quick idea.

When calling transferFrom, there are 3 variables of interest: msg.sender, _from and _to.

If _from == msg.sender or _to == msg.sender, you can assume it is a simple transfer.

If they are different, you can assume that msg.sender is a third-party that is handling the transfer on behalf of them. Perhaps Opensea.

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