# What happens after updating expired participant key?

**URL:** <https://forum.algorand.co/t/what-happens-after-updating-expired-participant-key/7517>\
**Category:** General\
**Created:** [August 2, 2022, 8:13pm UTC](https://forum.algorand.co/t/what-happens-after-updating-expired-participant-key/7517 "2022-08-02T20:13:47Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![Teresse](https://avatars.discourse-cdn.com/v4/letter/t/74df32/32.png) [@Teresse](https://forum.algorand.co/u/Teresse)\
**Post date:** [August 7, 2022, 4:55am UTC](https://forum.algorand.co/t/what-happens-after-updating-expired-participant-key/7517/5 "2022-08-07T04:55:54Z")

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Thank you so much for your patience and the detailed reply, Fabrice!  
[[specs/ledger.md at master · algorandfoundation/specs · GitHub](https://github.com/algorandfoundation/specs/blob/master/dev/ledger.md#previous-hash)]  
I still have one more question. From here, it states that `The previous hash is a cryptographic hash of the previous block header in the sequence of blocks`. So the hash here contains the field `ParticipationUpdates`, even though it’s optional, right?

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