L1 blocks cannot be fudged by validators. It is a value that can be safely used by apps.

Can that be said about the value of block.timestamp on a L2 like Arbitrum?

1 Answer 1


The block timestamp cannot be trusted to the same degree on a L2 like Arbitrum, but it is not fully gameable.

Whenever a batch settles on the L1, it sends the latest timestamp to the L2.

From the Arbitrum docs:

to limit the degree to which the sequencer can adjust timestamps, some boundaries are set, currently to 24 hours earlier than the current time, and 1 hour in the future

Kudos to Fred for helping me understand how this works.

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