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I signed up for today's Sip & Show but the lineup was full, so I'm asking here instead. Rewind is verified refunds for NIM inside Nimiq Pay. You pay, and if you want the money back, only the wallet that paid can ask, with one signature. Both the payment and the refund are verified on chain and end up on one receipt. Shops can register with one signature and share a payment link, and they refund from their own wallet, Rewind holds nothing. Try it in about a minute, and the 0.01 NIM comes back: Nimiq Pay → Mini Apps → Custom URL → https://rewind-rho.vercel.app → Pay 0.01 NIM → Request refund → sign. What I want to hear, blunt is fine: - Would you use this, or is a refund not a real problem for you? - Anything confusing between paying and getting the NIM back? - Does it feel finished, or like a prototype? Code is MIT: https://github.com/Harshyadav442277/rewind I'm on X at @hyadav42774, happy to connect and return the favour on your app.

Quick question for anyone who knows: is there a public testnet RPC endpoint for Nimiq PoS at the moment? rpc.nimiq-testnet.com no longer resolves and I couldn't find a documented replacement. The testnet explorer and faucet are both up, so the chain is clearly running. I'm building a Mini App that verifies payments server-side against chain history, so I need getTransactionsByAddress somewhere. Mainnet works fine via rpc.nimiqwatch.com and I can test there with tiny amounts, but testnet would be cleaner for a public demo. Happy to be pointed at a community-run node.

Hi everyone, I'm Harsh. My Cycle II mini app is Rewind, verified refunds for NIM payments. Paying with NIM is easy. Giving money back isn't: a crypto refund today is usually a second payment to an address someone pasted into a chat, with nothing proving it belongs to the person who paid. How Rewind handles it: • Every payment carries an order reference, and Rewind checks the payment on chain. • Only the wallet that paid can ask for a refund, by signing a one-time message in Nimiq Pay. Signing moves no NIM and costs no fee. • The refund is a new transaction that Rewind also verifies on chain, and both transactions end up on one receipt. Try it (about a minute, and the 0.01 NIM comes back): 1. In Nimiq Pay: Mini Apps → Custom URL → https://rewind-rho.vercel.app (Nimiq Pay may warn that it isn't in the mini app list yet; the catalog listing is pending) 2. Demo Store → Pay 0.01 NIM 3. Request refund → sign 4. Wait for "Refund verified on chain", then open the Receipt The Demo Store approves valid refund requests automatically, so you can test it alone. If you sell things for NIM, the Payment links tab lets you register a shop with one signature, share a payment link, and approve and send refunds from your own wallet. Feedback I'd really like: • Was anything unclear between paying and getting your NIM back? • Did any screen feel slow or confusing inside Nimiq Pay? • Would you use payment links with refunds for something you sell? If something breaks, reply with a screenshot and I'll fix it. Code is open source (MIT): https://github.com/Harshyadav442277/rewind

Can I build and submit two apps? I initially built one app and had almost completed it, but after evaluating the idea more critically, I realized it was relatively weak. So I decided to pivot and start working on a stronger second idea. Would it be better to submit both apps, or should I focus on submitting only the new one?