Oh I did not know that. I remember listening to tadje dryja talking about that in 2019 on youtube but I guess he skipped that part for the sake of simplicity. Do you know a good resource for learning about signature aggregation and proposals?
For signature aggregation (combining signatures, a potential fork of Bitcoin that could allow you to provide only 1 signature for multiple inputs, reducing fees): https://github.com/BlockstreamResearch/cross-input-aggregation
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