Bitcoin’s Only Modular


Execution Layer

Data Availability Layer

A Bitcoin-Powered ecosystem securing rollups with unmatched data availability and scalability.

Bitcoin’s Virtual Machine

Syscoin gives Bitcoin Superpowers

Syscoin gives Bitcoin ultimate functionality. Our modular EVM execution layer finally enables Bitcoin to support a world of decentralized applications.

You can now build your own Rollup on Bitcoin!

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$SYS is trusted and supported by
Bitcoin Miners

The Bitcoin Network understands the value of Syscoin utility

Bitcoin taps into Syscoin to gain smart contracts, data availability and infinite layers of scaling.

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Stake to Earn

Our network is supported by a fully decentralized community

Syscoin has been actively in distribution since 2014, boasting a robust community of holders.

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Coins locked

Multi-layered Data Availability

With Syscoin’s PoDA, the network is ready to serve critical applications. With zkDA coming soon, rollups will interconnect and unite with Bitcoin. DA Rollups may be used to increase the throughput giving a notion of multiple layers of DA available on SYS

  • Secured by Bitcoin’s PoW
  • Quantum Secure
  • Cheaper Transactions
  • Infinite Throughput 
  • More network resilience
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The need for $SYS

Don't blow your BTC on gas fees!

Syscoin, the purpose-built extension of Bitcoin’s own network provides ideal economics for micro-transacting and executing applications. $SYS is the utility-focused gas coin that does not intrude upon BTC economics.

Whether you just need UTXO for simple transactions, or fast low-cost smart contracts on our Rollux optimistic EVM rollup, SYS has you covered.

Layer-1: Syscoin

Layer-1 transactions are Bitcoin merge-mined.

Layer-2: Rollux

OPStack rollup anchored to Bitcoin's security through Syscoin PoDA.

Finality and Rewards

Our robust Sentry Node network provides full finality that boosts security.

Syscoin has a mature node network that’s supported by a wide community of holders. With a multi-quorom protocol, Syscoin Sentry Nodes add additional protection against state attacks.

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Decentralized Governance

Syscoin’s Sentry Node network incentivizes long term community engagement.

With a ladder of seniority that matures over 2.5 years, Sentry Node holders are incentivized to maintain their collateral to support the network.

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Live Sentry Nodes

Sentry Node

Syscoin’s Sentry Node network incentivizes long term community engagement.

With a ladder of seniority that matures over 2.5 years, Sentry Node holders are incentivized to maintain their collateral to support the network.

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Weekly Rewards*
Monthly Rewards*
Yearly Rewards*
No Seniority
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1 Yr Seniority
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2.5 Year Seniority
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* Total rewards over noted period of time

A little more about Syscoin

Live Features

Syscoin’s DA Solution: PoDA

In order for rollup technologies to serve high-value use cases, they need the security of Layer 1 data availability.

PoDA is a unique and efficient Layer 1 data availability solution developed by Syscoin. It takes advantage of a dual-chain design. Proofs of data are settled on the UTXO chain where they are made available globally to the EVM while also utilizing an existing block space fee market that is low-cost.

Documentation >

Rollux Layer-2

An EVM-based rollup suite for scaling smart contracts and financial computations to meet real-world demands.

Syscoin has a mature node network that’s supported by a wide community of holders. With a multi-quorom protocol, Syscoin Sentry Nodes add additional protection against state attacks.

Documentation > Github > Learn more >

Coming Soon


zkDA interconnects and unites all rollups with Bitcoin.

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Global Merged-
Mining Alliance

An alliance of projects and protocols advocating for an increase in merged-mining across mining pools globally with the goal of increasing decentralized security.



What is Syscoin?

Syscoin is the Bitcoin-Powered ecosystem securing rollups (L2s and L3s) with unmatched data availability. Syscoin gives superpowers to Bitcoin by providing it the ultimate functionality of a modular execution layer and everything that it needs to scale.

What are modular blockchains such as Syscoin?

The new paradigm is focused on modular blockchains. Rather than trying to achieve everything (scalability, decentralization, security) on a single layer (monolithic) blockchain, modularity involves multiple layers, where each layer is optimized to a specific purpose. Syscoin, the security-focused base layer, provides guarantees of ultimate security and decentralization to all the super fast low-cost layers that are built on top or that are integrated with Syscoin’s zkDA.

How does Syscoin provide scalability?

Our unique data availability helps scaling layers offer their users fees reduced over 1000% and the ability to provide practically limitless throughput with successive layers. Soon, further advancements such as Syscoin’s zkDA will enable other ecosystems to inherit the security of Syscoin’s data availability plus interoperability with all other ecosystems utilizing it.

What are some rollups that use Syscoin?

Rollux is an OPStack (Optimism-based) L2 rollup that is EVM-equivalent and utilizes Syscoin’s data availability. Rollux also provides native data availability based on Syscoin, enabling L3s on top of it. Cartesi enables application-specific rollups with a Linux runtime, transcending EVM limitations, and utilizes validity (zk) proofs and Syscoin’s data availability.

How does Syscoin help Bitcoin?

In multiple ways! First, it’s important to understand that we view Bitcoin as the world’s premier and most-proven secure means of decentralized self-sovereign digital ownership and transfer. That same decentralized security provided by Bitcoin’s Proof-of-Work network of miners is extensible through a process called merged mining, which Satoshi himself created and introduced to Bitcoin Core in 2010. This means Bitcoin’s network is capable of supporting far more than just storing and sending some BTC or an ordinal. In fact, technically it can already support everything Ethereum can, and more, without any Core protocol changes. However, for Bitcoin’s network to tap into this, an appropriately designed merge-mined modular blockchain is required, and Bitcoin miners need to support it. This is where Syscoin comes in.

Syscoin also helps Bitcoin by incentivizing Bitcoin’s miners with the utility coin $SYS. While BTC rewards continue to diminish, the Bitcoin miners who merge-mine Syscoin get the additional $SYS incentive at practically no extra cost. That incentive is tied to limitless utility, and this helps them to continue to support Bitcoin and keep its network decentralized indefinitely into the future.

Do any large Bitcoin mining pools support Syscoin?

Yes. Three of the top five Bitcoin mining pools, and some smaller pools, already contribute their total Bitcoin hashrate to the Syscoin ecosystem through merged mining. At the present time Syscoin’s hashrate typically reflects 50 to 60% of Bitcoin’s total hashrate. We are happy to assist additional pools with merge-mining so they can provide $SYS to their miners at practically no extra cost.

Does Syscoin depend upon Bitcoin in order to function?

No. Any SHA-256 miner can mine or merge-mine SYS. Mining SYS is not exclusive to Bitcoin. Since 2016, Bitcoin miners continue to represent the vast majority of hashrate mining SYS. Realistically this will continue. However, should they cease for any reason, SYS is supported by other miners, so the network and chain would continue.

Is Syscoin parasitic to Bitcoin?

No. To begin with, Syscoin's functionality does not depend upon Bitcoin's network. Going further, SYS is a utility-focused coin with economics based on EIP-1559, thus does not intrude upon BTC's scarcity-focused economics. Also, SYS is an extra incentive to Bitcoin's miners, encouraging their continued support of the Bitcoin network despite diminishing BTC block rewards. Syscoin also is an extension of Bitcoin's network that provides it with more functionality. In sum, Syscoin is not parasitic and is beneficial to Bitcoin.

Is merged mining secure? What about selfish mining?

At the very least, merge-mining brings the same challenges as standard Proof-of-Work. However, there are important considerations here beyond just the distribution of hashrate supporting the chain. Ultimately, whether a merge-mined chain is secure depends upon that chain’s own protocol. Syscoin is the first blockchain to make merged mining truly secure. This is accomplished by providing an additive layer of decentralized finality on top of the work of Bitcoin’s miners. This is accomplished by a vast network of independently operated non-authoritative incentivized Sentry full nodes which participate in randomized multi-quorums to provide chainlocks. This actually makes Syscoin far more difficult to 51% attack or “selfishly mine” than Bitcoin itself while still keeping Bitcoin’s own PoW at the bottom of the stack. Even if only a single pool mined Syscoin, an attack would still require that pool to control a supermajority of all Sentry nodes, a practically impossible achievement. This finality, which the Bitcoin parent-chain lacks, makes possible the unique data availability we provide to Bitcoin’s community, and so much more that Syscoin provides.

What is $SYS used for and where can I get it?

Don’t blow your finite BTC on gas fees for execution! Syscoin's native coin, $SYS, is used across the ecosystem for gas and transaction fees and to incentivize Bitcoin’s miners who support Syscoin as well as the Sentry nodes that further enhance Syscoin’s security. This coin is very similar to ETH in supply characteristics and deflationary dynamics. Acquire $SYS by heading to the Get SYS page!

Where can I learn more about Syscoin's design and/or the philosophy behind it?

Our Foundation President and Lead Core Developer maintains a Medium covering much of this in-depth and with some technical detail. Also, numerous interviews and Spaces have been held over the years with the various Syscoin teams, and can be found by searching X or Youtube.

White papers and other technical papers are available here.