# Unique Kernel Thread #73

**URL:** <https://forum.grin.mw/t/unique-kernel-thread-73/7688>\
**Category:** Development and Technical Discussion\
**Created:** [August 12, 2020, 6:37pm UTC](https://forum.grin.mw/t/unique-kernel-thread-73/7688 "2020-08-12T18:37:27Z")\
**Posts on this page:** 4\
**Page:** 2

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**Author:** ![johndavies24](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.grin.mw/johndavies24/32/1828_2.png) [@johndavies24](https://forum.grin.mw/u/johndavies24)\
**Post date:** [September 28, 2020, 11:54am UTC](https://forum.grin.mw/t/unique-kernel-thread-73/7688/21 "2020-09-28T11:54:13Z")

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By output ownership I just meant another way to phrase the replay attack issue. Simply that a user may expect that they are the sole owner of all their UTXOs but it is possible for other users to move them out of your wallet under certain circumstances.

Did he provide any insight into other solutions for replay attacks?

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**Author:** ![tromp](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.grin.mw/tromp/32/22_2.png) [@tromp](https://forum.grin.mw/u/tromp)\
**Post date:** [September 28, 2020, 1:44pm UTC](https://forum.grin.mw/t/unique-kernel-thread-73/7688/22 "2020-09-28T13:44:03Z")

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No; he didn’t provide any insight into other solutions.

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**Author:** ![johndavies24](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.grin.mw/johndavies24/32/1828_2.png) [@johndavies24](https://forum.grin.mw/u/johndavies24)\
**Post date:** [September 28, 2020, 6:52pm UTC](https://forum.grin.mw/t/unique-kernel-thread-73/7688/23 "2020-09-28T18:52:23Z")

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Cool, thanks for sharing the conversation! Beam is using unique kernels based on a simple blockheight expiry, it would be interesting to see if any of the predicted issues are affecting them. Although, it may be more complicated than that because a lot might not be seen until blocks fill up.

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**Author:** ![Kurt](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.grin.mw/kurt/32/3361_2.png) [@Kurt](https://forum.grin.mw/u/Kurt)\
**Post date:** [September 28, 2020, 9:01pm UTC](https://forum.grin.mw/t/unique-kernel-thread-73/7688/24 "2020-09-28T21:01:44Z")

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Yeah, I wonder which coins have full blocks aside from btc and eth. I can see the arguments in both parts. I would like Grin have maximum security and reliability though. Many challenges to get there, and they are not the only ones, for example ux

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