# Ipfs key and hash saving

**URL:** <https://discuss.ipfs.tech/t/ipfs-key-and-hash-saving/5124>\
**Category:** Help\
**Created:** [March 30, 2019, 8:30pm UTC](https://discuss.ipfs.tech/t/ipfs-key-and-hash-saving/5124 "2019-03-30T20:30:45Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![halmstad](https://avatars.discourse-cdn.com/v4/letter/h/9fc348/32.png) [@halmstad](https://discuss.ipfs.tech/u/halmstad)\
**Post date:** [March 30, 2019, 8:30pm UTC](https://discuss.ipfs.tech/t/ipfs-key-and-hash-saving/5124/1 "2019-03-30T20:30:45Z")

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hello ,

I have some question in my mind. 1st how we can in the best way interact means IPFS and Blockchain for key backup and hash saving , 2nd can we share a file with many user using GPG encryption at a time ,3rd do we know how many people we have in the list that got access the to certain file shared

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**Author:** ![stefanhans65](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ipfs.tech/stefanhans65/32/1466_2.png) [@stefanhans65](https://discuss.ipfs.tech/u/stefanhans65)\
**Post date:** [March 31, 2019, 11:07am UTC](https://discuss.ipfs.tech/t/ipfs-key-and-hash-saving/5124/2 "2019-03-31T11:07:50Z")

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Hi @halmstad,

As the second part of an exercise for the “101 IPFS Workshop” of the ProtoSchool Munich we have [Share a public read-write directory](https://github.com/ProtoSchool/munich/blob/master/exercises/IPFS-IPNS.md).

Here we use a private key created and shared by IPFS as the IPNS key to publish and get. It is not a production scenario, but a start to play and think about.

Feedback always welcome.

Cheers, Stefan