Spark & Ark The Next Generation of Layer Two | Bitcoin 2026
Lightning was Bitcoin's only Layer 2 for years, but that's changing fast. In this Bitcoin 2026 panel, Roy Sheinfeld of Breez sits down with Ethan Marcus (Flashnet), Seth For Privacy (Cake Wallet), Matthew Vuk (Second), and Ben Carman (Spiral) to dissect Spark and Ark, the two protocols racing to become Bitcoin's last-mile scaling solution. The discussion covers self-custodial Lightning challenges, inbound liquidity, federated trust models, Arc Service Provider economics, and why Lightning may become the interoperability glue between Bitcoin L2s.Trade Bitcoin's next move on Duelbits Predict — get 100% cashback on your first bet, up to $100. Bitcoin Magazine exclusive. 👉 https://duel.bz/BCM
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🔶 Moderator: Roy Sheinfeld - Breez
🔶 Ben Carman - Spiral
🔶 Matthew Vuk - Second
🔶 Seth For Privacy - Cake Wallet
🔶 Ethan Marcus - Flashnet
Chapters:
2:36 — Why scale Bitcoin at all? The case for not "just using Solana"
4:32 — Lightning's regulatory and custodial trade-offs
5:28 — Inbound liquidity, channel management, and offline receive
6:34 — Why Lightning doesn't scale economically as a last-mile solution
9:22 — Defining trust: custody, censorship resistance, and privacy
10:35 — Unilateral exit: what Spark and Ark each actually offer
10:59 — Spark explained: state chain, operators, and atomic swaps
13:08 — Ark explained: timeout trees, rounds, and trust refresh
14:38 — The two trust caveats with Ark: expiry and operator behavior
21:14 — Why we still need CTV and covenants for true self-custody scaling
22:26 — The economics of running an Arc Service Provider
24:13 — Lightning as the interoperability layer between Spark and Ark
26:18 — Lightning scales payments but not ownership
27:11 — Offline receive on Ark and the federated model question
28:28 — Second's laser focus on payments, not DeFi or stablecoins
29:39 — The unfortunate necessity of stablecoins and tether freezes
31:36 — Flashnet's mission: one global liquidity layer for Bitcoin
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