IOST is a cryptocurrency built on Ethereum. Cryptocurrencies have a number of advantages, for example, it takes 0.5 seconds to generate a block, and users can also get free gas to pay for operations.

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Please note that Olympus v3.8.1 is an incompatible upgrade and all node operators shall complete the upgrade before June 10, 2022.

Details are inside
https://medium.com/iost/iost-mainnet-olympus-v3-8-1-official-release-a04d8ab6f83d