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GOOD OBSERVATION! Vitalik Buterin did build Tag (prolly first implementation of OP_RETURN). Also, in 2013, Vitalik proposed more complex scripting for Bitcoin. He submitted a proposal to the Bitcoin core community. It was rejected—Bitcoin devs prioritized security and conservatism. So Vitalik said: Fine, I’ll build my own chain—with blackjack and DAOs. Ethereum was born in 2015 (it wasn’t until 2017+ that USDT moved to Ethereum, Tron, Solana, etc.) :)
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Even counterparty isn't that famous
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Vitalik was a bitcoiner, working on "Colored Coin / Master Coin" projects (which were both smart contract systems of various degrees).
Master Coin sorta became OMNI layer.
Tethers first release was on OMNI (before ETH existed).