Syscoin is a Bitcoin L2 that is merge-mined with Bitcoin, and a modular Proof-of-Work blockchain solution that brings rollups to Bitcoin's PoW. Syscoin provides to Bitcoin a scalable data availability layer which is necessary for rollups (and other EVM or AltVM layers) to tap into Bitcoin's network in a safe and scalable way. Syscoin's base is comprised of a dual-chain Layer 1: the core is the Syscoin native (UTXO) blockchain providing data availability and finality. Running in tandem with the UTXO chain is an Ethereum Virtual Machine (EVM) chain called NEVM (Network-Enhanced Virtual Machine), which is merged mined alongside the UTXO chain and also inherits finality.