If u allow me to discuss,,,
I previously suggested storing dust UTXOS in a separate Merkle tree or
strucutre in general if we are talking about the original set.
I'm a kind of person who doesn't like to throw any thing; if it's not
needed now keep it in the basement for example.
So, if dust UTXOS making a burden keep them in secondary storage, where in
such cases u can verify then delete them.



On Thu, Oct 7, 2021, 06:52 ZmnSCPxj via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> Good morning e,
>
> > mostly thinking out loud
> >
> > suppose there is a "lightweight" node:
> >
> > 1.  ignores utxo's below the dust limit
> > 2.  doesn't validate dust tx
> > 3.  still validates POW, other tx, etc.
> >
> >     these nodes could possibly get forked - accepting a series of valid,
> >     mined blocks where there is an invalid but ignored dust tx, however
> >     this attack seems every bit as expensive as a 51% attack
>
> How would such a node treat a transaction that spends multiple dust UTXOs
> and creates a single non-dust UTXO out of them (after fees)?
> Is it valid (to such a node) or not?
>
> I presume from #1 it never stores dust UTXOs, so the node cannot know if
> the UTXO being spent by such a tx is spending dust, or trying to spend an
> already-spent TXO, or even inventing a TXO out of `/dev/random`.
>
> Regards,
> ZmnSCPxj
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