November 1, 2025
11 mins

Why Bitcoin Miner Foundry Started Merge Mining Rootstock Blocks

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Foundry USA Pool, a leading Bitcoin mining group in North America, has begun merge mining Rootstock (RSK) blocks alongside Bitcoin. This allows miners to earn rewards from both Bitcoin and Rootstock without additional energy use, leveraging the same computational resources. The move addresses rising costs and reduced Bitcoin block rewards due to halving, offering miners an extra income stream through Rootstock's transaction fees, paid in RBTC.

Rootstock is a Bitcoin sidechain enabling smart contracts and decentralized finance (DeFi) applications while maintaining Bitcoin's security. Merge mining strengthens both networks' security, increases miners' profitability, and expands Bitcoin's use cases into DeFi. Foundry's initiative highlights a shift in mining strategies, benefiting miners and the broader Bitcoin ecosystem.

Why Bitcoin Mining Pool, Foundry is now merge mining Rootstock

What Are Merge Mining and Rootstock

To understand why Foundry's decision is impactful, it's essential to break down what merge mining and Rootstock are. Together, these technologies open up new possibilities for Bitcoin miners, making the mining process more versatile and rewarding.

How Merge Mining Works

Merge mining is a clever process that lets miners mine two blockchains at the same time using the same computational effort. This means miners can earn rewards from two networks without doubling their workload.

Here’s how it works: both blockchains must use the same SHA-256 algorithm. When a miner solves a block for Bitcoin, that same solution can also be submitted to a secondary blockchain, like Rootstock. This eliminates the need for extra mining equipment or additional energy consumption, making it a cost-efficient way for miners to diversify their income streams.

For mining pools such as Foundry, implementing merge mining involves updating software and coordinating with the secondary blockchain. However, the technical challenges are relatively minor compared to the potential rewards. The mining hardware continues to focus on Bitcoin, while the pool's software handles submissions to the secondary blockchain.

This streamlined process creates a win-win scenario, paving the way for Rootstock to enhance Bitcoin’s capabilities without disrupting the network's core operations.

Rootstock's Function in Bitcoin's Network

Rootstock (RSK) is a Bitcoin sidechain designed to bring decentralized finance (DeFi) to the Bitcoin ecosystem. Unlike other blockchains that aim to compete with Bitcoin, RSK works alongside it, leveraging Bitcoin's security while introducing new features.

RSK relies on Bitcoin's robust security model, allowing miners to earn additional RBTC rewards while securing both networks.

At its core, RSK enables DeFi applications on Bitcoin. It supports Ethereum-compatible smart contracts, which means developers can create lending platforms, decentralized exchanges, and other financial tools - using Bitcoin as the primary asset. This bridges the gap between Bitcoin’s role as a store of value and the programmable finance capabilities seen on other platforms.

A key feature of RSK is its two-way peg with Bitcoin. Users can lock their Bitcoin and receive an equal amount of RBTC, which they can then use within RSK-based applications. When they’re done, they can convert their RBTC back into Bitcoin. This keeps RSK closely tied to Bitcoin’s value while unlocking new use cases.

For miners, RSK offers an extra income stream without forcing them to choose between Bitcoin mining and supporting smart contract functionality. Merge mining allows them to do both simultaneously, reinforcing Bitcoin’s network while contributing to its growing ecosystem.

Foundry's Reasons for Merge Mining Rootstock

Foundry has embraced merge mining Rootstock as a way to enhance miner profitability and contribute to Bitcoin's broader development. This decision is anchored in three main factors: extending Bitcoin's functionality, leveraging a straightforward technical solution, and unlocking additional revenue streams for miners. Let’s dive into the technical, economic, and network advantages driving this initiative.

Supporting Bitcoin Network Growth

Foundry sees Bitcoin's future as more than just a digital store of value. By merge mining Rootstock, they are helping Bitcoin step into the decentralized finance (DeFi) space. This move underscores their commitment to Bitcoin's evolution, enabling smart contracts and other innovative use cases. As a result, both networks benefit from increased adoption and a higher volume of transactions, strengthening Bitcoin's position in the blockchain ecosystem.

Straightforward Technical Integration

Merge mining Rootstock comes with the added benefit of being technically simple to implement. Instead of building new mining operations from scratch, Foundry only needed to update their existing software. Since both Bitcoin and Rootstock use the SHA-256 hashing algorithm, no additional hardware was required. Foundry's mining rigs continue their primary focus on Bitcoin blocks, while the pool’s software simultaneously submits work to the Rootstock network, utilizing the same computational resources to secure both networks efficiently.

Boosting Miner Revenue

Merge mining Rootstock opens up an additional revenue stream for miners without increasing costs. One of the standout benefits is the share of transaction fees miners earn:

"Bitcoin mining pools choosing to merge mine Rootstock earn 79% of all transaction fees which are paid in rBTC." - Rootstock

Each Rootstock block mined generates fees in rBTC, which can be converted back to Bitcoin, supplementing the regular Bitcoin block rewards. This is especially important as Bitcoin halving events periodically reduce block rewards, making alternative income sources increasingly vital. Rootstock's transaction fees provide miners with a financial cushion against these reductions.

Foundry’s clients also benefit from higher returns. By enabling increased payouts without raising operational costs, Foundry ensures more consistent and attractive earnings for its miners. This approach not only enhances profitability but also strengthens the sustainability of their mining operations.

Benefits of Merge Mining for Miners and Bitcoin

Merge mining offers advantages that go well beyond just financial gains for Foundry's miners. It creates a mutually beneficial setup that helps miners, enhances network security, and broadens Bitcoin's potential for new applications. These benefits ripple across the cryptocurrency ecosystem, making it a game-changer.

More Revenue Without Extra Energy Use

Merge mining is all about efficiency - more earnings without increasing costs. Foundry's miners can now generate income from two networks at the same time, all while using the same amount of electricity as before. This is a huge advantage, especially in a world where energy costs are climbing and Bitcoin mining faces environmental scrutiny.

This system maximizes resources, allowing miners to earn from both Bitcoin block rewards and Rootstock transaction fees. For smaller mining operations operating on tight margins, this extra income can mean the difference between staying in business or shutting down. By making it easier for more miners to stay profitable, merge mining helps maintain a diverse and decentralized mining community, which in turn strengthens overall network security.

Stronger Security for Bitcoin and Rootstock

Merge mining doesn't just boost profits - it also makes both Bitcoin and Rootstock more secure. When Foundry began merge mining Rootstock, they brought Bitcoin's massive hash rate into the mix, enhancing Rootstock's security without requiring additional hardware or reducing Bitcoin's own hash rate.

This creates a two-way security boost. Rootstock benefits from Bitcoin's robust mining infrastructure, making it one of the most secure smart contract platforms out there. Meanwhile, Bitcoin gains from having more incentivized miners who can sustain operations thanks to the extra income from Rootstock fees.

This shared security model fosters a symbiotic relationship between the two networks. As Rootstock grows and processes more transactions, the fees for miners increase, making Bitcoin mining even more profitable. This, in turn, attracts more miners to the Bitcoin network, further reinforcing the security of both systems.

Beyond security, this approach supports Bitcoin's decentralization. By giving miners additional revenue streams, it reduces the risk of mining centralization, where only the most efficient operations could survive tough market conditions.

Growing DeFi and Smart Contracts on Bitcoin

Merge mining isn't just about profits and security - it’s also fueling the growth of Bitcoin-based DeFi. Every Rootstock block mined supports more smart contract transactions, DeFi protocols, and Bitcoin-powered applications.

Historically, Bitcoin lacked robust smart contract capabilities. But with Rootstock, Bitcoin holders can now engage in lending protocols, decentralized exchanges, and other DeFi applications, all while keeping their assets tied to Bitcoin's trusted security and stability.

This setup ensures Rootstock has the computational power to handle increasing transaction volumes as more DeFi applications emerge. The result? A positive cycle: better network performance attracts more developers and users, which generates more transaction fees, making merge mining even more rewarding for miners.

For Bitcoin as a whole, this represents a major leap forward. By enabling smart contracts and DeFi, Bitcoin becomes more versatile, potentially boosting its adoption and utility. And all of this happens without compromising the core security that Bitcoin is known for.

How Mining Service Providers Can Use This

Mining-as-a-service platforms have a unique opportunity to enhance customer profitability by adopting Foundry's merge mining capabilities. By integrating Rootstock merge mining, these platforms can unlock additional revenue streams for their customers without incurring extra costs.

The main benefit for mining service providers lies in improving operational efficiency at scale. When managing hundreds or even thousands of mining rigs across multiple locations, merge mining becomes a smart move that directly boosts customer returns. The extra income generated from Rootstock transaction fees goes straight to the customers, requiring no hardware upgrades or increased operational expenses. Let’s take a closer look at how this approach enhances profitability for mining rigs.

Increasing Customer Mining Rig Profits

Service providers can significantly improve customer payouts by setting up mining pools to validate both Bitcoin and Rootstock blocks simultaneously, requiring only minor adjustments.

For example, Sazmining’s managed services naturally extend customer rewards through merge mining. Customers who purchase mining rigs via Sazmining gain access to additional Rootstock rewards without needing to make extra investments or acquire specialized technical skills.

The implementation process is straightforward. A simple software update connects mining rigs to Rootstock-compatible pools, enabling the rigs to earn additional Rootstock fees. This update doesn’t alter energy consumption or hardware requirements, making it an efficient way to enhance profitability.

This strategy is especially valuable for customers operating with narrow profit margins. During periods of fluctuating Bitcoin prices or rising mining difficulty, the added revenue from Rootstock can help stabilize earnings, improving customer satisfaction and reducing churn. Additionally, merge mining aligns with sustainability goals by maximizing the use of renewable energy without increasing overall energy consumption or carbon emissions.

Merge Mining vs. Regular Bitcoin Mining

To better understand the benefits, let’s compare merge mining with traditional Bitcoin mining.

Aspect Traditional Bitcoin Mining Bitcoin + Rootstock Merge Mining
Revenue Sources Bitcoin block rewards and transaction fees only Bitcoin rewards + Rootstock rewards
Energy Consumption Standard mining power usage No additional energy required
Hardware Requirements Standard Bitcoin mining rigs No hardware upgrades needed
Setup Complexity Simple pool configuration Slightly more complex setup
Network Security Contribution Secures Bitcoin network only Secures Bitcoin and Rootstock networks

For instance, take a Bitmain S19 XP Hydro rig with a 246 TH/s hashrate. Under traditional mining, the rig generates Bitcoin rewards, minus monthly service fees of about $239. With merge mining, the same rig earns Bitcoin rewards plus extra Rootstock fees, leading to higher monthly returns.

By offering merge mining as an optional feature, service providers can differentiate themselves in the market. This approach provides customers with diversified revenue streams and a more stable income, even during volatile periods.

The technical requirements for merge mining are minimal. Most modern mining pool software already supports it, and infrastructure demands remain nearly unchanged. The key is to choose dependable Rootstock mining pools and ensure proper configuration across all rigs. For large-scale operations, the combined effect of merge mining can lead to significant additional revenue, all while utilizing the same facilities, energy, and maintenance resources.

Conclusion: Foundry's Impact on Bitcoin's Future

Foundry's integration of merge mining for Rootstock blocks marks a significant step forward in Bitcoin mining. By showing that miners can tap into additional revenue streams, Foundry has set the stage for broader adoption of this approach across the industry.

For mining service providers, merge mining offers a compelling opportunity to maximize customer profits. Companies like Sazmining could use this strategy to help their clients diversify earnings from Bitcoin mining rigs. This not only improves returns during unpredictable market conditions but also keeps operations running efficiently - benefits that build upon the merge mining advantages already discussed.

The impact goes beyond just profits. Merge mining strengthens the security of both Bitcoin and Rootstock networks simultaneously. As more miners adopt this method, the combined hash power grows, reinforcing the foundation for Bitcoin’s expanding DeFi ecosystem. This evolution enables Bitcoin to move beyond being a simple peer-to-peer payment system, opening doors to smart contracts and decentralized applications.

Additionally, the extra Rootstock rewards act as a financial cushion during times of increasing mining difficulty or fluctuating Bitcoin prices, helping miners maintain profitability even when the market is tough.

Merge mining doesn’t just enhance income - it also solidifies Bitcoin’s position in the DeFi space. As the ecosystem matures, miners who embrace this technology now will be better prepared to meet the rising demand for Bitcoin-based DeFi services and smart contract capabilities.

This shift highlights a broader trend in Bitcoin mining: the drive for maximum efficiency. By leveraging every bit of computational power to generate multiple revenue streams, miners are not only boosting their bottom line but also contributing to the security and growth of interconnected blockchain networks.

FAQs

What are the benefits of merge mining for Bitcoin miners and the network?

Merge mining offers Bitcoin miners a chance to boost their earnings by earning rewards like rBTC, all without consuming extra energy or needing additional hardware. This approach increases profitability while keeping operations efficient.

On top of that, merge mining bolsters the security of both the Bitcoin and Rootstock networks. By tapping into Bitcoin's hash power, Rootstock becomes more resilient to attacks, ensuring the safety of smart contracts, lending, and staking activities. This connection also expands Bitcoin's functionality, encouraging wider adoption and fueling demand.

How does Rootstock bring decentralized finance (DeFi) to Bitcoin?

Rootstock (RSK) builds on Bitcoin's foundation by introducing smart contract capabilities and compatibility with the Ethereum Virtual Machine (EVM). This means developers can create decentralized applications (dApps) that leverage Bitcoin's unmatched security while also utilizing the flexibility of Ethereum-style smart contracts.

By using merge mining, Rootstock ensures a high level of security and decentralization. This process allows Bitcoin miners to secure both the Bitcoin and Rootstock networks at the same time. With this approach, Rootstock acts as a robust decentralized finance (DeFi) layer for Bitcoin, offering fresh opportunities for innovation without compromising Bitcoin's core principles of security and decentralization.

What are the key technical requirements and challenges of merge mining Bitcoin and Rootstock?

Merge mining Bitcoin and Rootstock lets miners secure both networks at the same time, using the same computational power. This works because both blockchains rely on compatible proof-of-work algorithms, and Rootstock block data can be embedded within Bitcoin blocks. It’s an efficient way to maximize resources while contributing to the overall ecosystem.

That said, there are hurdles to overcome. One key challenge is dealing with block time variability, which can complicate synchronization between the two networks. Another issue is optimizing mining operations to avoid problems like sibling blocks, which can disrupt network performance. To address these, mining pools need to fine-tune their algorithms, ensuring smooth and efficient operations across both blockchains.

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