I'm starting a new business in the chaotic world of farm equipment.
My first product: "Lorenz, A Tractor”
Peter Todd
pete@petertodd.org
npub1ej49...ndrm
At the moment, tx pinning attacks are severely neutered.
Homework question: Why?
https://image.nostr.build/f2899640e1479dc1339f9fd526fa637fdee10668a77dc9c9befe225143986034.jpg#m=image%2Fjpeg&dim=1079x1096&blurhash=%7C66kF%3FR%25ISs%3DITjZRjR%24kD%5Ebj%5BNLWBXAj%5BM%7CWBbI-In%2CWIWmWHWBW%3FfAbas%3BWBbFjbj%5BoebFkAafSCS1a%5BoNf3aet6objI0eoMxbR%25%252ayofogae53njxcW%2Cs%3DWUxaj%5Eob5bWUxUjvs*j%5Bs-WBoe9-f%2Bs%7Eait1aen%7EWAsp&x=6f7996c8e060eeb5f1a811ce0de325be7ef5d21efec8739bc9ce72fba6dd0097
Good example of how stupid current lightning implementations are re: fees.
This tx paid $38/89,907sats to spend a single anchor output at 497 sats/vbyte (6x higher than necessary to get the tx mined), producing a single output just 6437 sats in size.
It's not a CPFP: the commitment transaction was mined 3 days before the anchor output was spent.
It's just an idiotic implementation that wasn't willing to forget about the anchor output; I know LND does this. The channel itself only had $2540 in capacity, so that one transaction spent 1.5% of the entire capacity on fees.
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Really unusual situation right now: the minrelayfeen of most mempools is very close to a typical next block transaction fee, due to a huge amount of txs at the same fee.
https://image.nostr.build/89b45d2e18ec3d46e7b72c17b55c93f524e06a1d9d4881c3921cb9d254e676af.jpg#m=image%2Fjpeg&dim=1080x1799&blurhash=%5DE7ws%40bAe*oGjZ-tj.s%2Bavt8RqW%3As%3BWUjZNDXBW%3FWGR%25RdkGR%3DR%3ANHNUj%7Bb1WGR*JVoNs%2CjcfhXRsSs%3Aawog-sfNW9oJWB&x=73772ab1298546496d9fbfbbbfc18861e2dfa46ea7044897a9bb79820f5de0eb
https://image.nostr.build/6379aa62ec7b26ac346608ac8719a8232fb0f545d17f27e9f22b886ccca860ac.jpg#m=image%2Fjpeg&dim=1079x1613&blurhash=%5EUFrkED%2B4%3DNHIWt6.YVyM%2CWEV%7Bocmlf%2Bb%5DbabuaeMWoto%40k9ouai1Kw_%24ioKxFWV%2BGS%23S%24bIX8n%25Ixj%3Ds%2BoJoIa%239%7EocxCoJsma%23Z%24bbkVj%5BkCjZ&x=fea78ab36f50590de36555928832704fb79859c70f7d7629500e9b2ae5cd600d
Re: the danger of out-of-band payments and anchors:
I just noticed that someone who had a anchor channel open with me force closed it, using ViaBTC's transaction accelerator to get the transaction mined without spending the anchors. :/
V3 Transactions Review
V3 transactions is a proposed set of mempool policies with the aim of allowingtransactions to use Child-Pays-For-Parent (CPFP), anchor outputs, and...
V3 Transactions Review
V3 transactions is a proposed set of mempool policies with the aim of allowingtransactions to use Child-Pays-For-Parent (CPFP), anchor outputs, and...
74.1 sat/vB mempool min fee!
It's possible that someone is setting up for an attack on lightning. The current Lightning protocol is kinda broken with respect to fees, as your commitment transaction (and refund transaction) isn't necessarily high fee enough to get propagated.
It's not quite as much of a problem as you'd expect, as many well connected nodes (rg mempool.space) have much bigger mempools. But anyway, lightning needs to get this fixed.
Not using RBF to begin with was a big mistake.
https://image.nostr.build/f4495326b74a50ea640ca4936c5209b5c9905dc751fbaed181818037e74d9abd.jpg#m=image%2Fjpeg&dim=1080x455&blurhash=Z46RN2Tc%255I.D%25RjOS-WE0%3Fdtn%25OE1X9s.In%251In%25D%256X2V%7CIURit9oZoOM%5DxcR%23RRRhaxohbWo%24&x=c19d2c798c710dd0cb3babdcf0f0918feb17fa554d4d1c42598f539de6428716
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