EOS DAPP in Exchange
How EOS is different than Ethereum that it brings block time to 0.5 seconds? How is this possible since Ethereum's average block time is around ~12 seconds?
In EOS, each producer creates 6 consecutive blocks before handing off to the next producer. Therefore, in these 3 seconds (6 x 0.5), there is no latency to propagate blocks as they're created by the same producer. The latency is a problem during hand-off, so it's possible that the last few blocks or the next few blocks get orphaned, which is why there are plugins suggested to minimize latency by accounting for geographical location of BPs.
Currently Ethereum uses Proof-of-Work based mining algorithm "dagger-hashimoto" and in future going to change it to Proof-of-Stake based mining algorithm "casper" to select block producer who will sign next block.
Whereas EOS uses Delegated-Proof-of-Stake based algorithm, in EOS, token holders vote to choose 21 block producers(There might be certain requirements here ex. certain amount of EOS token locked). Only these 21 chosen block producers will sign blocks on behalf of all EOS users.
Given above conditions block time in EOS will drastically reduced given only 21 block producers exists, whereas in Ethereum it is open that any one mining in network can theoretically be a block producer, so fixing block time to 15 seconds is design decision. If block time in Ethereum is reduced more orphan blocks will be produced and it will be difficult to chose longest chain.
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