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CD209: MATTHEW VUK - BARK - BITCOIN PAYMENTS ON ARK
1 hour 13 minutes Posted Jul 20, 2026 at 7:25 pm.
Matthew Vuk and the Bark project
What Bark is and how Ark wallets feel invisible
Lightning interoperability and unified invoices
Receiving funds with VTXOs and the Ark server
Trust model, atomic swaps, and wallet refreshes
Seed backups, cloud backup, and self custody
Fees, liquidity costs, and VTXO consolidation
Refresh windows, on chain rounds, and fee pressure
What happens if the Ark server goes offline
Privacy tradeoffs and what the server can see
Dust payments, denial of service, and chain weight
African payment gateways and infrastructure use cases
Cashu integration and proof of reserves with Bark
Bark versus Spark and Arkade wallet integration
Arkade, stablecoins, and Bitcoin only design
Closing thoughts and wallets to try
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Show notes

Matthew Vuk joins to discuss Bark, Second’s Bitcoin-only implementation of the Ark protocol. We get into how Ark wallets enable Lightning, on-chain, and instant Ark payments without managing channels or liquidity, plus VTXOs, delegated refreshes, unilateral exits, cloud backups, fees, privacy, and denial-of-service protections. Then we discuss running Ark servers, using Bark to power Cashu mints and African mobile-money gateways, proof of reserves, comparisons with Spark and Arkade, and Second’s mission to build open-source Bitcoin payment infrastructure.

Second: https://second.tech
Built with Bark: https://second.tech/docs/built-with-bark
Matthew on X: https://x.com/matthewvuk2
Second on Nostr: https://primal.net/second

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