On Sat, 2021-05-15 at 12:21 +0200, vjudeu via bitcoin-dev wrote:


>  All that is needed is producing a signature matching the sum of the
> public keys used in taproot, which is "(a+b-a)*G", 

This is simply not true.

Taproot does not enable this, or any other form of "cross-input
aggregation", i.e., spending multiple UTXOs with a single signature. 


Tim

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