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If we assume that for tipping and donation, the risk of "double spend" is minimal for the recipient (why the tipper/donor did in the first place?) I think is worth for the self-custodial aspect of it (little vtxos are custodial, but compound over-time and can be consolidated in bigger VTXO or UTXO)
Few.
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OOR Payments changes the trust model, as they rely on at least one paritcipant being honest and deleting the key (used to hold the pre-signed exit tree).
https://arkdev.info/docs/learn/payments-oor
That being said, normal Ark payment (using the so called Ruber shortcut) are already async.
Payment in Ark are very similar to ecash, in the sense the Sender and ASP co-signing and delegating the recipient to claim the payment once it comes online, basically a self-transfer. If all the senders are also recipient, there is no online requirement.
You can try it out here!
You can try the Ark with covenants and the proof-of-concept clArk (covenant-less Ark)
👇
The covenant-less version and the covenant one, being merged in a single impl as we speak! Stay tuned
https://github.com/ark-network/ark/issues/147#issuecomment-2135808618
RFC: Cashu zaps NIP
https://wikifreedia.xyz/cashu-zap-nip/f7z.io
Proposal to make cashu zaps where the payment itself is the zap (instead of waiting for a zap receipt from the zapper)
The sender locks a zap to the recipient's pubkey, optionally sending to a mint the user has recommended before (kind:38000).
Cashu is a bearer token so the receipt IS the money and the money IS the receipt.
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Keeping an eye on it! đź‘€
Ark Payments are very similar in this regard
Listen nostr:npub1w4sf3hsedukh33akdn5duld2yc5jlk6s02shur8553j0a59sm3jscws08a on nostr:npub1r8l06leee9kjlam0slmky7h8j9zme9ca32erypgqtyu6t2gnhshs3jx5dk podcast talking about Ark and Bitcoin scaling.
Ark Labs launches today, a new company dedicated to building hashtag#bitcoin layer-two solutions based on the new Ark protocol.
Transaction fees and delays caused by congestion on #bitcoin’s mainchain are increasing demand for more scalable payment solutions. Lightning has made significant strides, but UX challenges (like inbound liquidity management) are driving users toward custodial solutions.
New approaches to scaling are needed to supplement the Lightning Network. This is where Ark comes in. Ark, proposed 2023, is a layer two protocol designed to offer speed and scalability without the burdens of liquidity management (for end users, at least!).
Until now, Ark has been a theoretical solution to bitcoin’s scaling issues. But with the launch of Ark Labs, we’re making Ark a reality—we’ve released an open Ark implementation, which you can use to launch your own Ark Service Provider or wallet.
We’ve already started work on the first Ark-based services. If you’d like to be one of the first to try these out at launch, make sure you subscribe to our newsletter on our website
Ark uses a unique model for hashtag#bitcoin transactions—users connect to an Ark Service Provider (ASP) and transact with “virtual” transactions (VTXOs). Unlike Lightning, end users only need a light wallet and all on-chain liquidity management is handled by their ASP.
Importantly, an Ark VTXO can be redeemed on the hashtag#bitcoin mainchain at any time, even if the ASP is offline. This ensures that users have true self-custody of their Ark funds. Onboarding is easier too—users don’t need any bitcoin to open a channel and receive their first payment.
All that said, we need to emphasize that Ark is not a replacement for Lightning! Lightning is an essential piece of the scaling puzzle. It’s especially suited to enterprise settlements (e.g., exchanges, federations, and ASPs)—Ark simply fills in its gaps for consumer payments.
Ark’s finally here and we’re excited to pioneer new possibilities with #bitcoin. Whether you're looking to integrate Ark into your app, shape the protocol’s development, or make some of the first Ark payments, get in touch!
Full announcement
Today we’re launching Ark Labs, a new company dedicated to building solutions for the Ark protocol, a new #bitcoin layer two that makes bitcoin payments at scale simpler and with no sacrifices to self-custody.