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I’m reading the source code of Bitcoin Core, and I found that in the inv process, nodes will relay both txid and wtxid to other peer nodes. I have the following questions:

  1. Why does the node send these two ids, what are the benefits?
  2. Suppose a transaction’s txid is A, and its wtxid is B. Nodes will relay A and B inv announcements to peers. After a client received A first, will the client mark this transaction "fAlreadyHave" when receiving B later?

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By pplny

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