Polygon, a "layer 2" platform on the Ethereum blockchain, is merging with rollup platform Hermez Network in a 250 million MATIC deal. The acquisition was worth about $250 million based on MATIC's price on Aug. 4, when the deal was struck.

Polygon’s merger with Hermez is the first complete merger of one blockchain network into another.

Earlier this year, two Ethereum projects, Keep and NuCypher, announced a merger of their protocols into a decentralized autonomous organization (DAO) in a project nicknamed “Keanu,” but will keep their brands and companies separate. And Yearn Finance frequently announces mergers and partnerships, but it is unclear what is happening under the surface of those deals.

Polygon’s absorption of Hermez’s team and protocol is something different entirely.

Hermez is a zero-knowledge (ZK) rollup, which means that it uses mathematical proofs to verify and settle transactions. As Ethereum struggles with transaction bottlenecks, rollups have emerged as the preferred scaling strategy. And Hermez, which is the only decentralized rollup, is a user favorite.

The Polygon-Hermez merger is part of Polygon’s new strategic focus on ZK technology, also announced Friday. Polygon has made a $1 billion commitment to developing ZK-based systems, forming partnerships, hiring employees and acquiring ZK teams and projects like Hermez.

“We consider ZK cryptography the single most important strategic resource for blockchain scaling and infrastructure development, and we have a clear goal of becoming the leading force and contributor in this field for years to come,” Polygon co-founder Mihailo Bjelic told CoinDesk.