# Physical object authentication using PUF and blockchain

**URL:** <https://forum.flow.com/t/physical-object-authentication-using-puf-and-blockchain/1214>\
**Category:** Product & Ideas\
**Created:** [March 7, 2021, 6:41am UTC](https://forum.flow.com/t/physical-object-authentication-using-puf-and-blockchain/1214 "2021-03-07T06:41:40Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Kieta](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.flow.com/kieta/32/330_2.png) [@Kieta](https://forum.flow.com/u/Kieta)\
**Post date:** [March 7, 2021, 6:41am UTC](https://forum.flow.com/t/physical-object-authentication-using-puf-and-blockchain/1214/1 "2021-03-07T06:41:40Z")

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Is anyone working on use of PUFs and blockchain to verify the origin of physical objects? Specifically use of craquelure or optical PUFs. Thank you.

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**Author:** ![Gianni-PopMint](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.flow.com/gianni-popmint/32/282_2.png) [@Gianni-PopMint](https://forum.flow.com/u/Gianni-PopMint)\
**Post date:** [March 9, 2021, 3:16am UTC](https://forum.flow.com/t/physical-object-authentication-using-puf-and-blockchain/1214/2 "2021-03-09T03:16:21Z")

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> [@Kieta](#):
>
> craquelure

I heard of someone… somewhere who was using a splatter of UV in, that can only be seen by a certain lenses of some sort to create a unique pattern.

the only problem is if that ink is permanent or could fade away and or change the pattern.

It definitely something that many people are NOT considering.