davidmarcus
David Marcus

https://www.lightspark.com

Co-founder & CEO @ Lightspark ⚡️

Public Key

npub18m4nmc2wchzgcmzvnluqjzxyrpshp64mwje2vuz60kulny3v6c0qtgcl2x

NIP-05 Address

Profile Code

nprofile1qqsra6eau98vt3yvd3xfl7qfprzpsctsa2ahfv4xwpd8mw0ejgkdv8spz3mhxue69uhhyetvv9ujuerpd46hxtnfduqs6amnwvaz7tmwdaejumr0dsq3qamnwvaz7tmwdaehgu3wwa5kuegmwu5az

Publishing to

relay.damus.io

nos.lol

nostr.wine

Author Public Key

npub18m4nmc2wchzgcmzvnluqjzxyrpshp64mwje2vuz60kulny3v6c0qtgcl2x

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Last Notes

2025-09-06 21:09:15 UTC

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As far as we can orient and decide we will always want Spark to be an unopinionated, permissionless, neutral settlement layer.

2025-04-30 03:14:33 UTC

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I recommend looking at the docs here: https://docs.spark.money/

2025-04-30 02:59:24 UTC

Thank you @npub1sg6…f63m!
#note1a8z…lsgh

2024-06-26 16:48:06 UTC

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They already sell Bitcoin.

2024-06-25 15:13:14 UTC

I’m thrilled that @nubank has selected @Lightspark to bring the Bitcoin Lightning Network and UMA (Universal Money Addresses) via the @umastandard to its platform and customers. Now working with the Nubank team on the integration. Vamos! https://www.lightspark.com/news/nubank-announcement ⚡ https://image.nostr.build/f87d909e3e9614e5a8cf64901d34bb19f7955e053fb10a7e78c807ca718446ff.jpg

2024-05-15 23:20:36 UTC

Mutiny is pretty great.

2023-11-19 23:49:41 UTC

Per popular demand. X’posting here.
Lately, there's been more debate around the value of the #Bitcoin Lightning Network. Based on the work we've been doing @Lightspark for the past 18 months, I will share my honest view.
First things first — Bitcoin is the only viable neutral settlement asset and network that can usher in a new era of global real-time payments. Everything else is either too centralized, not secure enough, doesn't have the required regulatory clarity, or doesn't have the required depth of liquidity against the (fiat) currencies that people and businesses want to use for everyday transactions.
Once you believe the above, you must make Bitcoin move faster and cheaper than on L1 to make it competitive and valuable. But, you need to achieve this while retaining Bitcoin's trust and security principles. In other words, no new consensus paradigm. You also need to introduce privacy, while not sacrificing compliance.
Once you add up all the above, the only way forward — at least for now — is to use the Lightning Network.
Now let's talk about the challenges. Lightning used to be complex, failure rates for higher value transactions were relatively high, managing liquidity, rebalancing channels, and keeping a node up and running, were all things that got in the way of adoption. To the greatest extent, this is now a thing of the past. We — and others in the industry — have addressed these shortcomings and complications with good software and services. On Lightspark's stack, you can get up and running in no time, without ever having to learn about channels, liquidity, routing, or any of these different concepts.
To be clear, the above works exceptionally well for enterprises, and custodians. It allows them to settle BTC in near-real time, at a very low cost, in a private, compliant, and reliable way.
Add to that the newly launched and open-sourced UMA (Universal Money Address) standard, which extends LNURL to add compliance and FX capabilities, and any consumer or business can send and receive any currency of their choosing in real-time with a human-readable address between participating institutions without ever knowing Bitcoin or Lightning was involved. Just as someone sending an email doesn't think about SMTP and TCP/IP. It just works.
So we're done? Is it all great? No. It's not. We collectively have much more work to do. I agree with @Leishman, Lightning with the above advancements works well in custodial/institutional settings. This is why at Lightspark, we started our development journey by focusing on enterprise solutions at first. This is where most of the volume is, and where we felt we could have the most impact in the short and medium term.
Let's now turn to the work ahead:
- Non-custodial Lightning: as much as custodial LN is now fully ready for primetime, self-custody on Lightning presents two distinct challenges: (1) offline receive; and (2) channel open fees for smaller transactions. About (1) — if you're running a node on your device unless your app is foregrounded (iOS), or if you have bad connectivity, you won't be able to receive an incoming transaction. And (2) — opening channels with higher L1 fees is currently cost-prohibitive. Some solutions are being worked on to address these, from @lightning labs to @spiralbtc, and of course @lightspark. But to be blunt, if you want full support for non-custodial Lightning with offline receive and want to make it economically viable, you have to accept some form of compromise on the trustlessness level of the solution. With some solutions, you have to trust an LSP, with others, it's a bit better with more distributed trust across different entities/service providers. This will be for consumers to choose between usability, cost, and full trustlessness. There's a lot more work and research that is taking place to improve these solutions and find non-linear breakthroughs, but for now, tradeoffs are required.
- Pushing identity / addressing to be fully self-sovereign: LNURL, and by extension, UMA, is fantastic when it comes to user experience, but users rely on their custodians to provide the addressing service as it relies on DNS. Again, it's probably fine for most people, but that doesn't mean we shouldn't push harder to enable people to own their identity and money address and make that portable. Some exciting work we're tracking is what @TBD54566975 has been building with DIDs. We're also wondering — and to some, it'll be blasphemous! — whether there are interesting bridges to make with ENS in the future.
- Issuing other assets on Lightning: bringing stablecoins and other assets onto the network to make it more efficient for a subset of transactions will be critical. @lightning has been working on Taproot Assets and making good progress, @bitfinex is working on RGB, and we're working to help make this a reality across the board.
Lightning is seeing more talent flock to it rather than leave it. It's ready for primetime and mass market for exchanges, custodial wallets, banks, and institutions. It needs more work for non-custodial wallets and applications, and to bring stablecoins to the network. But let's take a deep breath. We're about to see #Bitcoin become the standard protocol for money on the internet with mass adoption on the horizon. It'll require tradeoffs and collective efforts, but I'm more bullish than ever on our odds of success.

2023-08-30 04:36:14 UTC

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I miss native iOS zaps. Might need to switch back to Android.

2023-08-30 04:05:05 UTC

Good day for Bitcoin today.

2023-05-17 14:48:16 UTC

Our team had so much fun making these to drive a point home. No one needs a mouse or a kettle that’s so complicated. We believe the same applies the Lightning Network and that’s what we do at Lightspark. Make it easy and reliable to build great payment experiences on ⚡️! https://nostr.build/i/2c334e05838fdeb4cf22b8bcc0752b6fd1a6b2d7799a1f76cd09637046ad1788.jpg https://nostr.build/i/adb7d5f62546cdf069bfd98d932ffcaaf1710a2d690496f82cad3c6cd33da58c.jpg

2023-05-10 16:03:32 UTC

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Yes.

2023-05-10 15:59:45 UTC

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Politicians that support Bitcoin have my support.

2023-05-10 15:57:58 UTC

🚨Looks like we have our very first Presidential candidate on Nostr! Let’s get Bobby Kennedy as many followers and show him some traction on the platform!
https://damus.io/note1k9ev8f6ugdphs7m9jtjdadw64t8fwyqaqj0uh2skys8usf00z3esnxpqel

2023-04-22 16:39:39 UTC

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We’ve tried to price our services fairly for the value provided. There’s a lot that goes on behind the scenes to automate basically *everything* so you can focus on building the best consumer experience on your end. We also offer 6 months of free service to select early stage startups.
Did you see this? https://www.lightspark.com/apply

2023-04-22 15:27:54 UTC

Things are going quite well, only a week or so after the launch of the Lightspark Platform. It turns out simplifying Lightning to the max and lowering the learning curve required to run a well connected node drives adoption. Curious about thoughts from all of you around things we could be doing better / more of. We want to support all of you as you build on LN! As a ref https://www.lightspark.com is where you can learn more. Feedback welcome!

2023-04-11 18:07:56 UTC

Hello nostriches! We shipped a little something today, check it out… https://www.lightspark.com

2023-03-17 17:14:31 UTC

Got distracted by the meltdown of banks in the last few days… What did I miss in Nostrland?

2023-03-14 14:08:30 UTC

So what’s the plan to build more fiat on-ramps to Bitcoin with many crypto-friendly banks gone, and clearly a targeted hit on them ongoing?

2023-03-10 18:11:17 UTC

If anything can make one more bullish about Bitcoin, these past few days will do the trick.

2023-03-09 03:23:12 UTC

Nostriches, join me in welcoming #[0] aka Micky Malka @ Ribbit Capital on Nostr!

2023-03-03 16:08:43 UTC

It never occurred to me until now that there was no ostrich emoji. Must. Fix.

2023-03-02 14:48:10 UTC

Very excited to bring the first bank on the Lightning Network! Xapo built their integration on Lightspark's stack which is yet to be available to the general public. More to come very soon! https://davidmarcus.substack.com/p/welcoming-the-first-bank-on-the-lightning?sd=pf

2023-02-28 15:24:18 UTC

I was away yesterday. What did I miss?

2023-02-25 19:58:03 UTC

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Let’s not take chances, though?

2023-02-24 16:34:54 UTC

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🤡

2023-02-23 17:14:45 UTC

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Wallet of Satoshi is MIA and it’s now obvious that many of us are using it as a default zap endpoint since most LN invoices are failing rn irrespective of sending wallet.

2023-02-23 17:04:58 UTC

I’m going to zap like Oprah today.

2023-02-22 23:17:49 UTC

This notion that Nostr is bad because of spam is intriguing. Get good paid (cheap!) relays and you get no spam at all if configured well. Am I missing anything?

2023-02-21 16:43:50 UTC

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It was me 😇

2023-02-21 16:12:37 UTC

Best relays?

2023-02-21 16:07:50 UTC

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You need to add your LNURL in your profile settings to enable zaps.

2023-02-21 15:52:05 UTC

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🤙

2023-02-21 15:33:45 UTC