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What is the best way (in terms of security or resources) to track my outgoing transactions through the RPC API?

I would like to be able to track them down using their tx id and also to have a fallback mechanism for when my outgoing transaction's id changes as a result of a malleability attack.

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I personally would look for newly spent outputs as opposed to TXIDs. The outputs get spent the exact same way in a malleability attack.

So create a hash based off of the inputs into the transaction, and when a TX comes in calculate that internal hash and check off of that.

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