Polygon Labs, a developer of scaling networks for Ethereum, has shifted toward "Polygon CDK," a blockchain-development kit powered by zero-knowledge cryptography. The older "Polygon Edge" was used by Dogechain, in an unofficial effort to build a Dogecoin-oriented smart-contracts network.
The new "Cronos zkEVM chain" is launching initially as a test network, based on Matter Labs’ software tools, which can be used to spin up new layer 2 and layer 3 “hyperchains” atop Ethereum.
Vitalik Buterin, a member of the Ethereum Foundation's executive board, once pushed "layer-2" networks as a way to provide faster and cheaper transactions. Now he's got ideas for "enshrining" some of those functions on the main chain.