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@PieterWuille Isn't that simply a duplicate coinbase transaction? Since block 91880 contains a non-coinbase transaction as well, the merkle root in the header will be different
I might do a longer answer tomorrow when I have time, but you should look into how electrumx structures its data to allow for fast querying across the entire utxo set
You should include the important and relevant content from the link in your answer - stackexchange aims to avoid link-only answers as they tend to be useless once the linked content is deleted or updated.
