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110 sats \ 1 reply \ @Murch 31 Dec 2023 \ on: TX size: reusing signature/data for several UTXOs/inputs bitcoin
No, every input needs to identify which UTXO it is spending and provide an input script, script arguments, and/or witness stack that satisfies the corresponding output script. The amount of data is the same regardless whether your UTXOs were locked to the same output script or different output scripts.
Also, even if it might be possible to implement such a change, I see zero chance of it being adopted, since it would financially incentivize the privacy-eroding practice of address reuse.
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