4

With segwit there will be two transaction ids wtxid and txid
Can either one of them be used as previous hash or only txid?

6

Inside transaction inputs, you have to refer to previous transactions using the txid. Allowing a wtxid there would be (1) a hard fork and (2) defeating the purpose, as it'd make transactions malleable again.

The wtxid is only used to compute the Witness merkle root, which is committed to in the coinbase.

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