# Cert-viewer with Ethereum

**URL:** <https://community.blockcerts.org/t/cert-viewer-with-ethereum/788>\
**Category:** Technical\
**Created:** [February 5, 2018, 10:08pm UTC](https://community.blockcerts.org/t/cert-viewer-with-ethereum/788 "2018-02-05T22:08:15Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jake666](https://sea2.discourse-cdn.com/flex016/user_avatar/community.blockcerts.org/jake666/32/258_2.png) [@jake666](https://community.blockcerts.org/u/jake666)\
**Post date:** [February 5, 2018, 10:08pm UTC](https://community.blockcerts.org/t/cert-viewer-with-ethereum/788/1 "2018-02-05T22:08:15Z")

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Hi guys,

Has anyone had any issues with cert-viewer when using Ethereum? I am testing using Ethereum Ropsten.

I get an error when I try to view the certificates using cert-viewer. I have reinstalled the latest git of cert-viewer, but when I run `python run.py -c conf_local.ini`,  
I get the below error. Any idea why this is occurring?

`2018-01-30 10:31:59,713 - root - ERROR - Unhandled Exception: unsupported chain (Chain.ethereum_ropsten) requested with blockcypher collector. Currently only testnet and mainnet are supported`

The bitcoin testnet worked fine, I am only getting this error when running Ethereum.

Thanks.

Jake

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**Author:** ![kim](https://sea2.discourse-cdn.com/flex016/user_avatar/community.blockcerts.org/kim/32/307_2.png) [@kim](https://community.blockcerts.org/u/kim)\
**Post date:** [February 6, 2018, 2:49am UTC](https://community.blockcerts.org/t/cert-viewer-with-ethereum/788/2 "2018-02-06T02:49:51Z")

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Hi @jake666, the cert-viewer doesn’t know about Ethereum Blockcerts yet. In general, we’re trying to deprecate the cert-viewer app (so it doesn’t receive much attention, as you probably noticed).

We prefer people to use the [Blockcerts web component](https://github.com/blockchain-certificates/cert-web-component), since this makes it easier to embed Blockcerts-aware display and verification widgets into an existing app. However, this one might be weak on documentation. Please give it a try and ask here if you have any questions.

Thanks,  
Kim

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**Author:** ![jake666](https://sea2.discourse-cdn.com/flex016/user_avatar/community.blockcerts.org/jake666/32/258_2.png) [@jake666](https://community.blockcerts.org/u/jake666)\
**Post date:** [February 7, 2018, 8:46am UTC](https://community.blockcerts.org/t/cert-viewer-with-ethereum/788/3 "2018-02-07T08:46:04Z")

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Thanks Kim. OK, I’ll give the web component a shot .

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**Author:** ![ravi2007147](https://sea2.discourse-cdn.com/flex016/user_avatar/community.blockcerts.org/ravi2007147/32/428_2.png) [@ravi2007147](https://community.blockcerts.org/u/ravi2007147)\
**Post date:** [August 16, 2018, 6:20am UTC](https://community.blockcerts.org/t/cert-viewer-with-ethereum/788/4 "2018-08-16T06:20:59Z")

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hi. i am using etherum ropster certificate validate. [http://dev.housa.io:8080/cert-web-component/demo/verifier-demo.html](http://dev.housa.io:8080/cert-web-component/demo/verifier-demo.html)

It doesn’t seem to working. can anybody help me understand the issue?