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Sure, all TXIDs are solely calculated from non-witness knowledge. Whereas many nodes have a whole copy of the blockchain, which does include all transactions, most nodes don’t have a full transaction index.
by way of https://developer.bitcoin.org/reference/p2p_networking.html
Nodes will promote unconfirmed transactions. These are then accessible to be shared upon a getdata tx request which will probably be responded to with a tx message.
If the transaction is already confirmed, the peer ought to know during which block the transaction was included (from the context during which it heard concerning the transaction within the first place), and would both request the entire block, or a Merkle department within the type of a merkleblock message.
You may learn extra concerning the P2P messages for instance right here: https://developer.bitcoin.org/reference/p2p_networking.html
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