Replying to Avatar Akashi Hyogo

The problem with point 1) is, that it is much more taxing on nodes then on spammers.

If you want to sync the chain in any reasonable time all the unspent utxo set has to be loaded in RAM.

It is already a few GB which has basically killed most of Rpi nodes.
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NokSuKao 2mo ago

I‘m running a raspberry pi with 8GB ram. Took me about 2.5 days to synchronize. What is acceptable I think.

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NokSuKao 2mo ago

And if I correctly understand, Bitcoin core only uses 512MB ram for the UTXO set the rest is stored on the ssd and fetched if needed. I do not see a problem with ram or disk space unless the number of those transactions will rise considerably.

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Juraj 2mo ago

With op_return, the utxo set does not grow at all. With pubkey data, it will grow forever.

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NokSuKao 2mo ago

Yes if there will be a significant amount of those transactions which is doubtable as there are cheaper ways (exploiting SegWit).