Metal Blockchain ($METAL) is a scalable Layer-Zero blockchain that aims to bring popular PoW blockchains like $BTC, $ETH, and $DOGE to PoS with smart contract functionality and trustless bridging. Core target audience are DeFi users and enterprises to launch their own chains or DApps.
Metal improves upon the initial work of Avalanche by adding a fourth subchain (A Chain) to offer a more resource efficient layer for payments and decentralized finance: Proton (based on Antelope protocol, adding WASM). Additionally $METAL posits it can remove the need for external wallet software outside of the browser, creating a more native Web3 experience by adding Web Authentication (WebAuthn) support for EVM.