SecondHQ, a newly established Bitcoin development lab, has recently garnered significant attention following the recruitment of a former Blockstream engineer known as “Grubles.” With over eight years of experience at Blockstream, Grubles has taken on a pivotal role in the development of Bark, SecondHQ’s flagship product, which aims to revolutionize the Bitcoin wallet landscape by offering a “fast, low-fee, self-custodial” solution.
As Grubles stated on social media about his departure from Blockstream, “It’s been an incredible opportunity to work with such a world-class team on both the marketing and engineering side.” He expressed excitement about his new journey at SecondHQ, which has also seen the addition of several other former Blockstream team members, including Neil Woodfine as the Chief Marketing Officer, Steven Roose as Chief Executive Officer, and Erik De Smedt as Chief Technology Officer.
SecondHQ is focused on pioneering advancements in end-user Bitcoin wallet technology, particularly through the Ark protocol. This newer layer-two payment solution offers different trade-offs compared to the established Lightning Network, allowing users to benefit from scalable self-custody and efficient payments at lower costs. Bark is designed particularly for interoperability with the Lightning Network, with Grubles elaborating, “The technique used for Bark is different from payment channels in Lightning, but the two are actually very complementary.”
Bark introduces an innovative Ark-to-Lightning bridge, enabling users to pay Lightning invoices directly from their Ark balance without the need for channels, liquidity, or liquidity service providers, thereby simplifying the payment process. The team has successfully raised $5.1 million from a private investor and currently employs 11 people dedicated to Bark’s development, with a mainnet launch anticipated soon. Interested users can begin testing Bark payments on Signet, with Grubles encouraging early adopters to try the new functionalities, stating, “It’s such a shift in the way we can do onboarding and payments.”
One of Bark’s standout features is its promise of self-custody at low costs. While scaling Bitcoin payments in a custodial format has been relatively straightforward, the challenge lies in providing self-custody options for smaller value amounts accessible to a broader audience. Grubles points out that while on-chain Bitcoin transactions can handle only a limited throughput, the existing infrastructure often leads to cumbersome onboarding experiences fraught with delays and confusion.
To tackle the inherent challenges of scaling Bitcoin payments globally while preserving decentralized self-custody principles, the Lightning Network emerged. However, managing a personal Lightning node typically involves a steep learning curve and complex hardware requirements, making it less accessible for the average user.
Current mobile wallets like Phoenix offer some Lightning Network-like self-custody but come with several drawbacks, such as user trust issues and a loss of privacy. Furthermore, onboarding users can incur costs exceeding $10 in SATS and take a significant time, which runs counter to the aim of presenting Bitcoin as a viable cash alternative.
In contrast, SecondHQ believes Bark can provide a superior user experience without the onboarding obstacles present in Liquid side chains or the management of Lightning channels. Grubles notes, “The UI for Bark wallets will be simplified in comparison, considering how you won’t need to differentiate between L-BTC and BTC,” underscoring the importance of straightforward user experiences for onboarding new Bitcoin users.
Bark operates on Virtual Unspent Transaction Outputs, or vUTXOs, pre-signed transactions that guarantee the subsequent creation of a true UTXO for the user. This approach allows for instant, low-cost Bitcoin transactions while maintaining flexibility when settling on the main Bitcoin blockchain when necessary. The centralized coordination server that facilitates Ark’s functionality represents a significant trade-off, yet it aims to preserve self-custody through users’ unilateral exit capabilities.
Grubles emphasized that while there are trade-offs associated with any scaling solution, Bark’s design allows users to exit back to the on-chain Bitcoin network effectively, maintaining sovereignty over their funds. He stated, “Our expectation is that Bark becomes the default way end users engage with the Lightning Network.” As Bark gears up for its launch, it aims to redefine how users interact with Bitcoin, marrying innovation with a commitment to decentralization and user accessibility.
