How do DAOs know the exact start/end time of on-chain proposals when it goes by block number vs timestamp? Is it just an estimate like (# of blocks * 12s block time) or am I missing something?

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Looks like an estimate based on 12s block time is the answer. Thanks @dot for the source https://sourcegraph.com/github.com/lilnounsDAO/lilnouns-monorepo/-/blob/packages/nouns-webapp/src/components/Proposals/index.tsx?L42-48

At tally we estimate the time based on average block times. The estimate improves as the block approaches

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I meant more-so on the frontend side, like the "Ended" card here https://nouns.wtf/vote/217 

I'm pretty sure the on-chain vote actually ended ~1 hour after the stated time

Not sure about the specific case, but a smart contract can decide based on the time a tx is included in a block if a call is valid or not.

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How do governments decide that your “exactly 18 and eligible to vote” on Election Day? 

Interesting similarity.

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I thought there could be slight variations with a 12s target. Found this chart - more consistent than I expected https://ycharts.com/indicators/ethereum_average_block_time 

In the span of a few day voting period this tiny variation doesn't really matter. I wonder how accurate the estimates were pre-merge though haha

I think under PoS the block times are constant, no?

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