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Matthew Vuk, head of research at Second, explains Bark as a second implementation of Arc, a Bitcoin Layer 2 protocol that simplifies Lightning payments by managing liquidity and channels.
Bark-enabled wallets like Noah and Arky offer a unified invoice, allowing users to send and receive Bitcoin payments via Arc, Lightning, or on-chain without managing liquidity or channels.
Matthew Vuk explains that received Lightning payments appear as VTXOs in a Bark wallet, functioning similarly to on-chain UTXOs and representing a sum of sats that can be spent.
Bark powers mobile money gateways in Africa, like Tando in Kenya and Mavapay in Nigeria, and payment terminals, offering instant Bitcoin payments and local currency payouts.
Matthew Vuk details how Bark enables Cashu mints to hold VTXOs as reserves, enhancing privacy and allowing verifiable proof of reserves through self-spending to a Noster pubkey.
Matthew Vuk positions Bark as Bitcoin-only, focused on payment efficiency, contrasting with Arcade's stablecoin/DeFi focus. He claims Bark offers easier unilateral exit implementation than Spark.
Second aims for Bark to be an open protocol, enabling independent Arc servers and serving as long-lasting payment infrastructure, akin to Lightning, rather than a short-term profit venture.