OpenZeppelin is the industry standard for smart contract security. Founded in 2017, it provides open-source contract libraries, security audits, and the Defender monitoring platform, with $50M+ raised.
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MetaMask is the world's leading crypto wallet and Web3 gateway by ConsenSys, launched in 2016 with 30M+ MAU, supporting Ethereum and EVM-compatible chains.
Ethereum is the first general-purpose smart contract platform, launched in 2015 and founded by Vitalik Buterin, with ETH as its native cryptocurrency. After shifting to Proof-of-Stake in 2022, energy use fell 99.9% and its Layer 2 ecosystem powers Web3 and on-chain payments.