From: ZmnSCPxj <ZmnSCPxj@protonmail•com>
To: shymaa arafat <shymaa.arafat@gmail•com>
Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists•linuxfoundation.org>
Subject: Re: [bitcoin-dev] [Lightning-dev] Removing the Dust Limit
Date: Thu, 07 Oct 2021 10:01:53 +0000 [thread overview]
Message-ID: <ZKZ4RR6uAv0mG8yFQyRkWDTFQ7JnsGVfLQcMTmsc5ui7MTJXuzMkVk5YQTniPuc4F_KRhn7BEZZHEK60IZYZYU9A1r-tbmfPTnIs0pOd7oU=@protonmail.com> (raw)
In-Reply-To: <CAM98U8nSOQ9HpdRLBdkcFAdToW=z7_EhnYisMb7F46ExmJkT-w@mail.gmail.com>
Good morning shymaa
> 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.
While this technique helps reduce *average* CPU cost, it does not reduce *worst-case* CPU cost (and if the secondary storage trades off to gain increased capacity per satoshi by sacrificing speed, it can worse the worst-case time).
It is helpful to remember that attacks will always target worst-case behavior.
This is why quicksort is strongly disrecommended for processing data coming from external sources, its worst-case time is O(n^2).
And we should switch to algorithms like mergesort or similar whose average times are generally worse than quicksort but have the major advantage of keeping an O(n log n) worst-case.
Moving data we think is unlikely to be referenced to secondary storage (presumably in a construction that is slower but gets more storage per economic unit) moves us closer to quicksort than mergesort, and we should avoid quicksort-like solutions as it is always the worst-case behavior that is targeted in attacks.
Regards,
ZmnSCPxj
next prev parent reply other threads:[~2021-10-07 10:02 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-08 18:52 [bitcoin-dev] " Jeremy
2021-08-08 21:14 ` Matt Corallo
2021-08-08 21:41 ` Oleg Andreev
2021-08-08 21:51 ` [bitcoin-dev] [Lightning-dev] " David A. Harding
2021-08-08 22:46 ` Jeremy
2021-08-08 23:07 ` Jeremy
2021-09-30 22:07 ` Pieter Wuille
2021-10-01 13:40 ` Erik Aronesty
2021-10-07 4:52 ` ZmnSCPxj
2021-10-07 8:17 ` LORD HIS EXCELLENCY JAMES HRMH
2021-10-07 8:34 ` LORD HIS EXCELLENCY JAMES HRMH
2021-10-07 10:35 ` LORD HIS EXCELLENCY JAMES HRMH
2021-10-07 9:13 ` shymaa arafat
2021-10-07 10:01 ` ZmnSCPxj [this message]
[not found] ` <CAM98U8kKud-7QoJKYd5o245o8vGeUD7YD2OnXF_QeKaO33dSTw@mail.gmail.com>
[not found] ` <MCYvJzqskIC56X-ylVCNgdaVk6SNnpCE6GgssXxK-znwwK4MoA41a2A-yNuCG8s99ll3h__YjCjBlP99A27Clbip-aYbF2ZwLpZ0SJT0j2U=@protonmail.com>
2021-10-08 7:44 ` shymaa arafat
2021-10-08 10:38 ` ZmnSCPxj
2021-10-08 22:47 ` ZmnSCPxj
2021-08-09 13:22 ` Antoine Riard
2021-08-10 0:30 ` Billy Tetrud
2021-08-10 5:04 ` Jeremy
2021-08-10 5:44 ` Billy Tetrud
2021-08-10 11:37 ` ZmnSCPxj
2021-08-10 18:39 ` Charlie Lee
2021-08-10 6:14 ` David A. Harding
2021-08-10 22:37 ` Antoine Riard
2021-08-11 0:46 ` ZmnSCPxj
2021-08-12 22:03 ` Anthony Towns
2021-08-20 4:51 ` Jeremy
2021-08-20 5:45 ` shymaa arafat
2021-08-21 3:10 ` ZmnSCPxj
2021-08-26 21:21 ` Billy Tetrud
2021-08-27 9:07 ` shymaa arafat
2021-08-30 3:31 ` LORD HIS EXCELLENCY JAMES HRMH
2021-08-18 19:06 shymaa arafat
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