Replying to Avatar Peter Todd

Indeed.

I'm doing an analysis of covenant dependant layer two protocols right now, which I'm trying to finish ASAP, so I should have a better understanding of the issue soon.

Unfortunately the answer might be that there's no good answer.
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Sjors Provoost 2y ago

Indeed there may not be. If (CPFP) packages are incentive compatible, then not supporting them in the p2p protocol creates and incentive to submit them out of band.

But having the p2p support also makes more obvious that out of band payment might be cheaper than sending the whole package.

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Peter Todd 2y ago

...and the code for CPFP is already written!

Most important thing is to fix protocols to use better techniques. We're fortunate that RBF is about half the cost of CPFP in most cases.