# Zawy’s Alternating Timestamp Attack

**URL:** <https://delvingbitcoin.org/t/zawy-s-alternating-timestamp-attack/1062>\
**Category:** Protocol Design\
**Created:** [August 9, 2024, 2:21pm UTC](https://delvingbitcoin.org/t/zawy-s-alternating-timestamp-attack/1062 "2024-08-09T14:21:27Z")\
**Posts on this page:** 1\
**Showing post:** 24

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**Author:** ![murch](https://delvingbitcoin.org/user_avatar/delvingbitcoin.org/murch/32/139_2.png) [@murch](https://delvingbitcoin.org/u/murch)\
**Post date:** [August 21, 2024, 2:51pm UTC](https://delvingbitcoin.org/t/zawy-s-alternating-timestamp-attack/1062/24 "2024-08-21T14:51:12Z")

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> [@sjors](#):
>
> With FTL meaning “Future Time Limit”. So do you mean just the existing rule that when we see a block it can’t be more than 2 hours in the future? Or do you mean the timestamp can’t be more than 2 hours ahead of that in the previous block?

The latter: we would not accept a block with a timestamp more than two hours in the future. (We have had “benign” gaps of more than two hours between blocks before.)

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