# Can I use email for credentialSubject.id in blockcerts v3?
**URL:** https://community.blockcerts.org/t/can-i-use-email-for-credentialsubject-id-in-blockcerts-v3/3728
**Category:** Technical
**Created:** [January 6, 2025, 10:43am UTC](https://community.blockcerts.org/t/can-i-use-email-for-credentialsubject-id-in-blockcerts-v3/3728 "2025-01-06T10:43:38Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Alise](https://community.blockcerts.org/u/Alise)
#### Post date: [January 6, 2025, 10:43am UTC](https://community.blockcerts.org/t/can-i-use-email-for-credentialsubject-id-in-blockcerts-v3/3728/1 "2025-01-06T10:43:38Z")
I want to issue Blockcerts v3 certificates, but it is currently difficult for everyone in my organization to have a DID.
Therefore, I am considering using each person’s email in the credentialSubject.id field.
Are there any issues with this?
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### Author:  [@lemoustachiste](https://community.blockcerts.org/u/lemoustachiste)
#### Post date: [January 6, 2025, 10:45am UTC](https://community.blockcerts.org/t/can-i-use-email-for-credentialsubject-id-in-blockcerts-v3/3728/2 "2025-01-06T10:45:10Z")
Yes, you can use whatever value makes sense in your system for the credentialSubject.id property
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### Author:  [@Alise](https://community.blockcerts.org/u/Alise)
#### Post date: [January 18, 2025, 6:09pm UTC](https://community.blockcerts.org/t/can-i-use-email-for-credentialsubject-id-in-blockcerts-v3/3728/3 "2025-01-18T18:09:40Z")
Thank you for your response.
I have an additional question: It seems that the Blockcerts Wallet generates a public key and a private key. How can the issuer use this public key in the implementation? If it is too difficult to implement due to a lack of examples, I am considering using an email address instead.