# Student private key usage?
**URL:** https://community.blockcerts.org/t/student-private-key-usage/3082
**Category:** Technical
**Created:** [February 12, 2022, 12:28pm UTC](https://community.blockcerts.org/t/student-private-key-usage/3082 "2022-02-12T12:28:22Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@jkwan](https://community.blockcerts.org/u/jkwan)
#### Post date: [February 12, 2022, 12:28pm UTC](https://community.blockcerts.org/t/student-private-key-usage/3082/1 "2022-02-12T12:28:22Z")
I’m new on blockcerts and still learning from GitHub repos and this forum. So far able to create and issue a sample certificate on bitcoin testnet and Verify it from a mobile wallet.
So far, I don’t see any feature that uses the student/wallet private key.
What can the user/student do that needs the private key?
Thanks
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### Author:  [@lemoustachiste](https://community.blockcerts.org/u/lemoustachiste)
#### Post date: [February 28, 2022, 2:09pm UTC](https://community.blockcerts.org/t/student-private-key-usage/3082/2 "2022-02-28T14:09:26Z")
Hi @jkwan,
I don’t believe you should ever expose the student’s private key, but you’d likely want to reference the public key in the `credentialSubject.publicKey` property.
While this feature is not implemented yet, we expect to use this property to verify the identity of the holder of the credential when initiating a verification, but also to prevent the wallet from holding credentials that were not addressed to the holder.
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### Author:  [@jkwan](https://community.blockcerts.org/u/jkwan)
#### Post date: [March 3, 2022, 10:09pm UTC](https://community.blockcerts.org/t/student-private-key-usage/3082/3 "2022-03-03T22:09:31Z")
Thanks @lemoustachiste, that clarify the need of students private key usage.