Vitalik: The most fundamental role of Ethereum is not smart contracts, but a cryptographic 'public bulletin board' According to Foresight News, Vitalik Buterin, co-founder of Ethereum, posted an article sharing his rethinking of the core values of Ethereum after attending the Real World Crypto Cryptography Conference. He proposed that the most fundamental role of Ethereum is not smart contracts, but a "public bulletin board" in the cryptographic sense, which provides a globally shared data availability layer. \Vitalik pointed out in the article that Ethereum has recently completed a PeerDAS upgrade, which has increased data availability by 2.3 times and is expected to further expand by 10 to 100 times. He also emphasized the value of Ethereum in three dimensions: anti censorship payments, anti witch attacks, and smart contract programming layer, and believed that the main obstacle at present is that the outside world has not yet realized that Ethereum transaction fees have significantly decreased and the expansion roadmap has significantly matured.