# Cert verifier stuck at format validation

**URL:** https://community.blockcerts.org/t/cert-verifier-stuck-at-format-validation/1099
**Category:** Support
**Created:** [June 10, 2018, 2:48am UTC](https://community.blockcerts.org/t/cert-verifier-stuck-at-format-validation/1099 "2018-06-10T02:48:07Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![KuAmirul](https://avatars.discourse-cdn.com/v4/letter/k/b2d939/32.png) [@KuAmirul](https://community.blockcerts.org/u/KuAmirul)
#### Post date: [June 10, 2018, 2:48am UTC](https://community.blockcerts.org/t/cert-verifier-stuck-at-format-validation/1099/1 "2018-06-10T02:48:07Z")

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I have issued a certificate on Bitcoin Testnet. I am trying to verify the cert using the verifier on [https://www.blockcerts.org/](https://www.blockcerts.org/) however, the verifier does not proceed from “Format validation”

![image](https://us1.discourse-cdn.com/flex016/uploads/blockcerts/original/1X/d81a71b5ee37f16a1896ac7fa6591deba0e6685e.png)

Is it something wrong with my certificate?

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### Author: ![GuillaumeDuveau](https://sea2.discourse-cdn.com/flex016/user_avatar/community.blockcerts.org/guillaumeduveau/32/485_2.png) [@GuillaumeDuveau](https://community.blockcerts.org/u/GuillaumeDuveau)
#### Post date: [June 28, 2018, 1:01pm UTC](https://community.blockcerts.org/t/cert-verifier-stuck-at-format-validation/1099/2 "2018-06-28T13:01:23Z")

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Same here (on Ethereum Ropsten though), certificate generated with cert-tools : [https://raw.githubusercontent.com/guix77/blockcerts-certificates/master/certificates/ropsten/talao/guillaumeduveau-2.json](https://raw.githubusercontent.com/guix77/blockcerts-certificates/master/certificates/ropsten/talao/guillaumeduveau-2.json)

I console.log(status) of cert-verifier-js’s CertificateVerifier and I have the step “CertificateVerifier” then “failure”, I will investigate

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### Author: ![GuillaumeDuveau](https://sea2.discourse-cdn.com/flex016/user_avatar/community.blockcerts.org/guillaumeduveau/32/485_2.png) [@GuillaumeDuveau](https://community.blockcerts.org/u/GuillaumeDuveau)
#### Post date: [June 28, 2018, 2:20pm UTC](https://community.blockcerts.org/t/cert-verifier-stuck-at-format-validation/1099/3 "2018-06-28T14:20:31Z")

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Debugging in verifier.js showed that I had some unmapped fields, it was the displayHtml that was “missing”, it’s fixed here [https://github.com/blockchain-certificates/cert-tools/pull/28](https://github.com/blockchain-certificates/cert-tools/pull/28) (just a cleanup of Sandoche’s work in [https://github.com/blockchain-certificates/cert-tools/pull/27](https://github.com/blockchain-certificates/cert-tools/pull/27))

@KuAmirul you might have the same problem, or not. You could check if you have unmapped fields by modifying certifier.js if you use a local one:

L129 getUnmappedFields(), add a console.log(matches[i]) in the for loop

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### Author: ![KuAmirul](https://avatars.discourse-cdn.com/v4/letter/k/b2d939/32.png) [@KuAmirul](https://community.blockcerts.org/u/KuAmirul)
#### Post date: [June 28, 2018, 3:11pm UTC](https://community.blockcerts.org/t/cert-verifier-stuck-at-format-validation/1099/4 "2018-06-28T15:11:15Z")

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I’ll give it a try. thanks!