Lead Core Lightning, Standards Wrangler, Bitcoin Script Restoration ponderer, coder. Full time employed on Free and Open Source Software since 1998. Joyous hacking with others for over 25 years.
Public Key
npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Profile Code
nprofile1qqs0zuj4s6jq9sr2ajqc69rc53d25rwpd3afcjrfm97r2qek69hcuscpz3mhxue69uhkummnw3ezummcw3ezuer9wcq3camnwvaz7tmwdaehgu3wvf5hgcm0d9hx2u3wwdhkx6tpdspt9qp3
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Published at
2024-06-08T03:44:48Z Event JSON
{
"id": "2a2f9df4a08077b41de1ca2ec3dd7d072ca45729a1f8debdf711e46de1586e6b" ,
"pubkey": "f1725586a402c06aec818d1478a45aaa0dc16c7a9c4869d97c350336d16f8e43" ,
"created_at": 1717818288 ,
"kind": 0 ,
"tags": [
[
"alt",
"User profile for Rusty Russell"
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],
"content": "{\"name\":\"Rusty Russell\",\"display_name\":\"Rusty Russell\",\"website\":\"https://rusty.ozlabs.org\",\"about\":\"Lead Core Lightning, Standards Wrangler, Bitcoin Script Restoration ponderer, coder. Full time employed on Free and Open Source Software since 1998. Joyous hacking with others for over 25 years.\",\"lud16\":\"npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s@npub.cash\",\"nip05\":\"[email protected] \",\"picture\":\"https://rusty.ozlabs.org/images/Rusty_Russell-lca2011+crop.jpg\"}" ,
"sig": "16ded7f3f6efc75faa92bca1936052a0244e479662f36393857d45acceeca06f47ccdc61e1156b673c7a06ae17ff1804ac8177da28aecb38b1d4dba8e3b7b8ef"
}
Last Notes npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Well, actually the migration failed, so you didn't need to downgrade. But now you've done that you can upgrade to 25.02 if you want. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell It seems to me that you could prove a hardened derivation or a BIP-39 derivation. Unfortunately this reveals your secret key, so you need to either use a (quantum resistant!) ZKP, or a two-stage reveal: hash of the proof, what outputs you will spend, and an indication of what address you want to transfer the coins to, then after that is mined, you do the spend at put the derivation in the annex (or, for non-taproot, in an OP_RETURN). npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Yes, gossip is a terrible way to propagate real-time information about the state of your channel. This is kind of by design since we stagger gossip, but also there are real propagation issues which we'd like to solve a gossip v2, but it will still be very slow. There's another proposal which is to allow you to publish a fee rate card that would have several different levels and the fee would vary depending on the remaining capacity in your channel. So someone just looking for a cheap payment would try the lowest fee rate that you offer and probably fail, but somebody who was really eager to get their payment through would be able to pay the highest. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Interesting. I see it the opposite way. People are proposing all kinds of one-off hacks for their specific use cases, which in my experience leads to more bugs and less usability, and exponential complexity as they don't work together. I would rather see "what if we had full scripting again?" and review proposals from that angle. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Can't zap btw https://image.nostr.build/5fe13670c1e77716ad8867a1adacb1acecddcd89e11650997de4e5f7c8d4c1f0.jpg https://image.nostr.build/5fe13670c1e77716ad8867a1adacb1acecddcd89e11650997de4e5f7c8d4c1f0.jpg npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Non sequitur, but I'm curious. What do you dislike about restoring Bitcoin Script? npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell I used chatgpt to revise a speech, asking it to increase emotional impact. The result was anodyne: there was only one phrase I liked, the rest was, basically, a series of the most predictable next words. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell I don't identify as a #Bitcoiner. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell "Tether is owned and operated by bitcoiners" npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell You misunderstand. One key benefit of tether getting establishment approval is that nobody in the establishment expects them (or anyone else) to be full reserve. That's something you only do if you're trying to appeal to weird cypherpunks and Austrians whackos. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Lol. I'm "punch a hole in the other side of the single-sided floppy disk to use the other side" old. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell I think the promise of higher fees in future is stealing fees. Behaviors which would currently be economically reasonable have been beaten out of people by runs of high fees and the foreshadowing of higher feerates they represent. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell #Bitcoin price predictions and stupid people attract. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell I have been "Code Monkey" and more recently "Code Contributor". If you ever see me with a "Vice President" title please kill me: it's clearly an evil clone. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell You're going to buy a tie? npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell This spectrum is good, but a bit prescriptive if you want to evaluate future schemes. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell It's possible, but my current approach is in-place, which makes for easier review. See https://github.com/rustyrussell/bitcoin/commits/guilt/varops/ npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell I have too much on my plate. I am excited about restoring Bitcoin Script, but I am more then full-time with my Lightning work. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Well, Jade also supports Liquid, so it makes sense. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Sometimes, I feel Blockstream marketing team really earn their salaries: https://image.nostr.build/bfaabae48d29cc58823500f18e58fc32aebe64eec17160806a8f03998240592a.jpg npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell We do have a BIP32 for the onchain funds, so you could have an external watcher. We should add an xpub to getinfo: want to file an issue requesting it for next release? npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell You can't take an existing secret and express it as BIP-39. This is a huge problem :( You have to start with a BIP-39 in the first place. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Hmmm, your zap invoice system does not like 210k sats. 21k sats worked fine. Repeatable... npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell If everyone withdraws every time, privacy gain is minimal. But (despite the obvious risk of a rug pull) using your ecash mining funds as a regular wallet to pay *other* things is a win. There's already something of a trust relationship, I guess npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Meanwhile, on TwiXter: https://image.nostr.build/ee34ac2f2b894eb494247ea449c037428129e71bb5b4139a04571f300cf0d870.jpg npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Dijkstra hated BASIC, too. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Yeah. Not only have I not seen that happening, it's almost always the case that adjacent projects bring in more outsiders. And they gain the experience and knowledge to cross over later, if they choose. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Anyone set up NWC on Core Lightning? I don't really want to have to read all the NIPs and implement YA nostr client! npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Green does. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell The term "mining" actually seemed to have actually smoothed funding for Bitcoin mining from traditional mining investors: it's a commodity where you spend on infrastructure up-front with unknown returns which depend on market factors outside your control. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell No, the gold mining analogy is a good one: you have to do real work, and the results diminish over time as easier deposits get extracted. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Meanwhile, over here*: npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell If you do JSON RPC I strongly recommend you guarantee one request per line. This makes clients easier to write: read a line, parse npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell TIL accidentally that in Firefox on mobile you can long hold on an emoji to get a description of it! npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell This will age so very badly. But at least this thesis is testable, so kudos on that! npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Much better! npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Not biodegradable either! npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell This happened to me previously: clean out the port with a toothpick. Pocket lint is a real issue. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Reminds me of the classic: https://www.gnu.org/fun/jokes/ed-msg.en.html npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Perhaps keep such dogma on X, and use Nostr for more reflective posts? npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell NICE TRY SPOOK! 😁 npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Anecdata: I had an invoice which failed on my Phoenix wallet which worked with xpay from my local node. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell https://repebble.com/ npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell What this feels like is hard to put into words. Once you have an idea, you have to code it. Whether it's a fix or a new solution, the urge to make it extant is incredibly powerful. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell So, there's a place offering Bitcoin-denominated life insurance. Here's the problem though: they invest the funds to make return in *Bitcoin*. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Let's assume I can build an AMM. Now I need to understand exactly how they work in Eth, that makes this kind of thing impossible in Bitcoin. And I don't: it's not my thing. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Honestly, surprise on the up-side is nice. Unusual. But let's take our wins! ❤️ npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Exactly as expected. Also: disappointment will continue. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell But CHECKTXHASH is still the wrong idea. You want to fix script then do full introspection, not this weird hash introspection which simply adds bloat. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Greg Maxwell, Pieter Wuille, to name two. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell I've become a big believer in success spirals, but the converse, loser spirals, is also true. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell There are many arguments why it won't happen, but they're at a disadvantage because it *did* happen to Ethereum apparently. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Honestly, I'm still struggling with Bitcoin soft fork proposals. I believe we will end up with full introspection: there are too many things people want to build which require it. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell His Master's Voice npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell It's very wise of you to run them as separate users, but you could have them all in the same group and make sure the directory for lightning RPC is accessible by that group as well as the file itself? npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell You get that from a random noisemaker? Do you see Jesus in your toast too? npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell I haven't tried lnbits, but glancing at the docs, I would usually use the CoreLightningWallet backend, but that is only if lnbits is on the same machine. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell FFS. Someone says someone said Trump said he holds a lot of Bitcoin. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell I understand this! We are definitely less polished in many areas. Progress can be slower than I want. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Hmmmm, there are screeds of text I could throw here: nullc on Reddit, describing various things. But two examples: npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell I think it was after my first year at Blockstream I asked if I could have regular 1x1s with then-CTO Gregory Maxwell. I was, perhaps, too inexperienced at that point to take full advantage of that, but his form of thinking has been a model for me on how to think about Bitcoin, though I don't always agree with him. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Wait, you haven't seen The Princess Bride? npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Great dress!! npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Yep. NOBODY. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Don't do this to me, man: I'm on holidays! npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell I am a little surprised by those buying into the idea that Trump will lead a deficit-reducing administration. I expect conflict, chaos and massive falling out, with the result being business as usual. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Yes. When MtGox went down, and I decided to start working on Bitcoin, I forced myself to read through those loss threads on Reddit. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell I don't usually find Nic compelling, but I'm enjoying the thoughtful contrariness of this piece, opposing a Bitcoin Strategic Reserve (and predicting it won't happen): npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell #CLN release 24.11.1, for those fans of xpay. I've been impressed how many people are testing it, and especially those who go all in on the #reckless "xpay-handle-pay" setting! npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell https://antoinep.com/posts/softforks/ npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Blocked the bot. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Sure, but we wouldn't have anything to talk about! 🤣 npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell The only thing dumber than talking about the Bitcoin price is making Bitcoin price predictions. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell I mainly end up hiring workaholics. This is a consequence of seeking passionate, smart people who love their work. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell xpay (not *coat*, thanks autocorrect!) bug reports trickle in. I'll try for a .1 release this week with fixes. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Here's what you need to search up: npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell It would be possible to have a deliberately deanonymized ecash which allowed the mint to make people whole, but that would be a whole different kind of irresponsible. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell "Hell hath no fury like a vested interest masquerading as a moral principle" is also related... npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell So, a lovely interaction with Jeremy Rubin where he shattered my XOR simplified CTV scheme. Damn. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell You should take a month off. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell BTW, Rearden (apparently from Jeremy?) pointed out that my simplified CTV-like scheme was flawed because it didn't commit to the order of input txids. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell I'm slowly coming around to the following roadmap: npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Sorry, I was assuming that we also changed signature semantics to commit to the prior txids. New tapscript, or new sig opcode. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell I'm a bit slow: to really understand something I usually need to design it myself, then figure out the differences between my ugly creation and someone else's masterpiece. This is particularly hard in the Bitcoin space, where any significant change has to intersect with every other future change we expect (fees will rise and a few bytes will really matter, we never get to deprecate anything and L2 protocols of various kinds are going to be wild). npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Some nice coat bug repots coming in, from real usage. A nice "please submit a bug report" message came in (obviously, a case I thought would never get hit!). npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell We discard what we've "learned" after an hour. We could degrade faster, or we could try to measure channels recovery speed. This requires more analysis though! npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell It is important to empathize with frustrated users. It's sometimes an unattainable ideal, but who hasn't hit software that Just Doesn't Work? We don't really care if it's just something about our setup, or fundamentally broken, or a completely unhelpful error message: it's an incredibly frustrating feeling of impotence. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell https://github.com/ElementsProject/lightning/releases/tag/v24.11rc2 npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Writing release notes is fun, but the part I really like in the release process is preparing the first commits for the *next* release: npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Ah, your own fear of your attraction is showing. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Note: it doesn't, this post is a joke some confused people took seriously :) npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell It wouldn't have attracted the hard money maximalists, and the early marketing would have suffered. (Remember the one in a million club?). But bag holders generally use rationality to justify their beliefs, not the other way around, so I don't expect much would have changed. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell It can though. In a tree, n/2 anchor outputs and n/2 inputs which spend them. But if you're all paying (the same) agent to neighbor-boost, it's one tx for all of them... npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Reverse it, it's still one bit for multiple transactions. "The next tx is committing to me". npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Thanks! There was a refinement where it used a single bit, rather than txids (but it was limited to sponsoring a single tx: you need to reverse it to set the bit in the sponsee if you want multiple txs for one bit). npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell But yes, they're now *possible*. But they're really a workaround for not being able to express what you actually want. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Costs. Another output and another tx. Ouch. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell Usually these schemes are used for unilateral exit, so no :( npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell There is, potentially, a cool trick which could help though! Jeremy proposed a kind of "neighbor fee" tx which would pay the fees for the immediately-preceding tx in a block (which, annoyingly, I can't find now! Anyone?). You really want this to stack (so it's probably better as a forward, rather than backward bit) and I don't think there's any code, but it makes CTV a more obviously optimal choice for simple covenants, AFAICT. npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s Rusty Russell The problem with CTV is fees. When you look at most designs using CTV, they need *another* tx, and an anchor output, so they can pay fees.
