# Support **URL:** https://community.blockcerts.org/c/support/12.md [Latest](https://community.blockcerts.org/latest.md) · [Categories](https://community.blockcerts.org/categories.md) --- ## [About the Support category](https://community.blockcerts.org/t/about-the-support-category/243)
**Author:** [@Chris\_J](https://community.blockcerts.org/u/Chris_J)\ **Replies:** 0
--- ## [\[Blockcerts Wallet\] IOS does not allow v3 certificates](https://community.blockcerts.org/t/blockcerts-wallet-ios-does-not-allow-v3-certificates/3942)
**Author:** [@Berthvid](https://community.blockcerts.org/u/Berthvid)\ **Replies:** 5\ **Last updated:** [January 15, 2026, 2:32pm UTC](https://community.blockcerts.org/t/blockcerts-wallet-ios-does-not-allow-v3-certificates/3942 "2026-01-15T14:32:51Z")
I noticed that I can add my certificates into the blockcerts wallet for android, but when trying to add them in the IOS app, it says “This is not a valid link” or something like this. --- ## [\[Identity verification\]Why derive and compare issuing address with transaction?](https://community.blockcerts.org/t/identity-verification-why-derive-and-compare-issuing-address-with-transaction/3538)
**Author:** [@linear](https://community.blockcerts.org/u/linear)\ **Replies:** 2\ **Last updated:** [November 17, 2025, 4:50pm UTC](https://community.blockcerts.org/t/identity-verification-why-derive-and-compare-issuing-address-with-transaction/3538 "2025-11-17T16:50:47Z")
Hello, In the cert-verifier-js, the identity verification derived issuing address from did document and compare it. I don’t know the exactly function of the step. As the DID had been written in the VC which means the DI… --- ## [Android app issue adding credential](https://community.blockcerts.org/t/android-app-issue-adding-credential/3912)
**Author:** [@Dan](https://community.blockcerts.org/u/Dan)\ **Replies:** 2\ **Last updated:** [October 24, 2025, 1:55pm UTC](https://community.blockcerts.org/t/android-app-issue-adding-credential/3912 "2025-10-24T13:55:18Z")
Hi everyone. I got a new phone from ios to android. I got the app downloaded and i shared the file. I went to add credential and imported it. Then the credential showed up but after i clicked the back arrow it wasnt the… --- ## [Unable to add Issuer on Android 15 (flip back to same page after clicking"add issuer")](https://community.blockcerts.org/t/unable-to-add-issuer-on-android-15-flip-back-to-same-page-after-clicking-add-issuer/3921)
**Author:** [@greenhellebore](https://community.blockcerts.org/u/greenhellebore)\ **Replies:** 0\ **Last updated:** [October 6, 2025, 3:20pm UTC](https://community.blockcerts.org/t/unable-to-add-issuer-on-android-15-flip-back-to-same-page-after-clicking-add-issuer/3921 "2025-10-06T15:20:26Z")
Hello! I am on Android 15 and trying to add an issuer for my digital diploma. I entered URL & one-time code. Each time I click “Add Issuer” the “adding issuer” box will pop up, and then disappear, returning me to the sam… --- ## [Blockcerts verifier](https://community.blockcerts.org/t/blockcerts-verifier/3919)
**Author:** [@Berthvid](https://community.blockcerts.org/u/Berthvid)\ **Replies:** 1\ **Last updated:** [September 29, 2025, 6:10am UTC](https://community.blockcerts.org/t/blockcerts-verifier/3919 "2025-09-29T06:10:36Z")
Did the official blockcerts verifier got removed from the main page? I was testing the verify step after issuing my certificates and I was using this verifier to make sure I got everything right. --- ## [Why can anyone with a link to the credential add it](https://community.blockcerts.org/t/why-can-anyone-with-a-link-to-the-credential-add-it/3856)
**Author:** [@Saadii](https://community.blockcerts.org/u/Saadii)\ **Replies:** 1\ **Last updated:** [July 17, 2025, 12:53pm UTC](https://community.blockcerts.org/t/why-can-anyone-with-a-link-to-the-credential-add-it/3856 "2025-07-17T12:53:15Z")
Hey everyone so tbh I don’t know much about blockcerts but my school used it for high school diplomas and before graduation they asked us to make accounts (or passphrases) and then add the school as issuer. I did that an… --- ## [Why does blockcerts.org not working?](https://community.blockcerts.org/t/why-does-blockcerts-org-not-working/3751)
**Author:** [@abraham](https://community.blockcerts.org/u/abraham)\ **Replies:** 0\ **Last updated:** [February 15, 2025, 11:29pm UTC](https://community.blockcerts.org/t/why-does-blockcerts-org-not-working/3751 "2025-02-15T23:29:29Z")
Hi there ! Hope you’re doing well. I’m trying to open the Blockcerts official website (blockcerts.org) since many days, but it looks to not work. Surprisingly (and fortunately), the community site is working. Does anyo… --- ## [How to add custom additional fields - BlockcertValidationError](https://community.blockcerts.org/t/how-to-add-custom-additional-fields-blockcertvalidationerror/276)
**Author:** [@uzu](https://community.blockcerts.org/u/uzu)\ **Replies:** 9\ **Last updated:** [October 14, 2024, 5:47am UTC](https://community.blockcerts.org/t/how-to-add-custom-additional-fields-blockcertvalidationerror/276 "2024-10-14T05:47:37Z")
Hello, I’m trying to create certificates containing custom additional fields. My cert-tools conf.ini contains the following line: additional\_global\_fields = {"fields": \[{"path": "$.badge.xyz\_custom\_field","value": "thi… --- ## [I want help on how to set up educational certification blocks](https://community.blockcerts.org/t/i-want-help-on-how-to-set-up-educational-certification-blocks/3607)
**Author:** [@Helen](https://community.blockcerts.org/u/Helen)\ **Replies:** 1\ **Last updated:** [August 13, 2024, 6:23am UTC](https://community.blockcerts.org/t/i-want-help-on-how-to-set-up-educational-certification-blocks/3607 "2024-08-13T06:23:35Z")
Hello everyone :wave: I am now exploring the use of block certificates for certifying in colleges and universities. Could anyone offer their experiences and ideas for ideal methods for setting up and handling a Blockcer… --- ## [AI Assistance for University Deployment?](https://community.blockcerts.org/t/ai-assistance-for-university-deployment/3473)
**Author:** [@IDSov\_Now](https://community.blockcerts.org/u/IDSov_Now)\ **Replies:** 1\ **Last updated:** [June 26, 2024, 5:03pm UTC](https://community.blockcerts.org/t/ai-assistance-for-university-deployment/3473 "2024-06-26T17:03:21Z")
I’m looking into putting together a Blockcerts project for a University diploma program. I learned about python years ago and have looked at the Blockcerts github, tools, and other resources at a very high level. With a… --- ## [USB access problem on a server](https://community.blockcerts.org/t/usb-access-problem-on-a-server/3511)
**Author:** [@ely](https://community.blockcerts.org/u/ely)\ **Replies:** 1\ **Last updated:** [June 23, 2024, 6:18pm UTC](https://community.blockcerts.org/t/usb-access-problem-on-a-server/3511 "2024-06-23T18:18:24Z")
Hello I am trying to use cert\_issuer on a server, but I don’t know how to use the USB on which I store my private key to sign certificates. --- ## [I have a 24-word seed and I'm trying to restore, but the app says it's invalid](https://community.blockcerts.org/t/i-have-a-24-word-seed-and-im-trying-to-restore-but-the-app-says-its-invalid/3431)
**Author:** [@tfar\_234](https://community.blockcerts.org/u/tfar_234)\ **Replies:** 12\ **Last updated:** [April 25, 2024, 2:19pm UTC](https://community.blockcerts.org/t/i-have-a-24-word-seed-and-im-trying-to-restore-but-the-app-says-its-invalid/3431 "2024-04-25T14:19:22Z")
Hello Blockcerts community, I got a degree in 2020 (still have the .json), and at some point I uninstalled the blockcerts app or got a new phone. Fine, I thought, I have the seed stored in my password manager. Today I … --- ## [Error: XMLHttpRequest is not a constructor](https://community.blockcerts.org/t/error-xmlhttprequest-is-not-a-constructor/3560)
**Author:** [@ely](https://community.blockcerts.org/u/ely)\ **Replies:** 2\ **Last updated:** [February 2, 2024, 2:18pm UTC](https://community.blockcerts.org/t/error-xmlhttprequest-is-not-a-constructor/3560 "2024-02-02T14:18:08Z")
I am using cert verifier js in next 13 and using the npm run build command gives me the following error: TypeError: global$1.XMLHttpRequest is not a constructor Using the npm run dev command the library works correct… --- ## [Transaction Processes in Blockcerts](https://community.blockcerts.org/t/transaction-processes-in-blockcerts/3534)
**Author:** [@ely](https://community.blockcerts.org/u/ely)\ **Replies:** 1\ **Last updated:** [December 21, 2023, 6:55pm UTC](https://community.blockcerts.org/t/transaction-processes-in-blockcerts/3534 "2023-12-21T18:55:06Z")
Hello, Working with Blockcerts raised a question for me. How does Blockcerts handle transactions? I’m creating certificates, and it requests a signature to complete the transaction. But how does Blockcerts manage the pr… --- ## [Integration Inquiry: Japan Open Chain with Blockcerts](https://community.blockcerts.org/t/integration-inquiry-japan-open-chain-with-blockcerts/3517)
**Author:** [@joc\_sean](https://community.blockcerts.org/u/joc_sean)\ **Replies:** 2\ **Last updated:** [December 11, 2023, 2:37pm UTC](https://community.blockcerts.org/t/integration-inquiry-japan-open-chain-with-blockcerts/3517 "2023-12-11T14:37:55Z")
I represent Japan Open Chain, a Ethereum-compatible layer 1 public blockchain. I’m writing to know how we can integrate our blockchain with the Blockcerts standard. We’re keen to understand the integration process. Tha… --- ## [Cert-issuer: Ethereum configuration](https://community.blockcerts.org/t/cert-issuer-ethereum-configuration/3469)
**Author:** [@SinuheCortes](https://community.blockcerts.org/u/SinuheCortes)\ **Replies:** 4\ **Last updated:** [December 4, 2023, 3:05pm UTC](https://community.blockcerts.org/t/cert-issuer-ethereum-configuration/3469 "2023-12-04T15:05:51Z")
Hello, I need some help to answer some questions I have about how cert-issuer should be installed with the ethereum configuration. I have noticed that there is a pip wheel to install cert-issuer, so my question is, d… --- ## [Cert-tools Error](https://community.blockcerts.org/t/cert-tools-error/2823)
**Author:** [@LSmith](https://community.blockcerts.org/u/LSmith)\ **Replies:** 7\ **Last updated:** [October 29, 2023, 3:38pm UTC](https://community.blockcerts.org/t/cert-tools-error/2823 "2023-10-29T15:38:25Z")
When attempting instantiate-certificate-batch -c conf.ini after using create-certificate-template -c conf.ini to create a template, I get the following error: Traceback (most recent call last): File "/usr/local/bin/in… --- ## [Cert-issuer -c conf.ini Error](https://community.blockcerts.org/t/cert-issuer-c-conf-ini-error/3450)
**Author:** [@oto3](https://community.blockcerts.org/u/oto3)\ **Replies:** 6\ **Last updated:** [October 6, 2023, 5:06am UTC](https://community.blockcerts.org/t/cert-issuer-c-conf-ini-error/3450 "2023-10-06T05:06:19Z")
When I run the command I get the following error: What should I do? TypeError: CertificateV3Handler.\_\_init\_\_() missing 1 required positional argument: 'app\_config' conf.ini issuing\_address = 0x00000000000000000000000… --- ## [Help: python error signing certificates with cert.issuer](https://community.blockcerts.org/t/help-python-error-signing-certificates-with-cert-issuer/3464)
**Author:** [@ely](https://community.blockcerts.org/u/ely)\ **Replies:** 3\ **Last updated:** [September 1, 2023, 11:39am UTC](https://community.blockcerts.org/t/help-python-error-signing-certificates-with-cert-issuer/3464 "2023-09-01T11:39:37Z")
Hello I am using blockcerts, I had to switch from windows to ubuntu and using python 3.12. I have already created a template and I have filled it with information. Now I’m trying to sign it with cert-issuer. I am using … --- ## [Computed hash does not match remote hash](https://community.blockcerts.org/t/computed-hash-does-not-match-remote-hash/3465)
**Author:** [@ely](https://community.blockcerts.org/u/ely)\ **Replies:** 1\ **Last updated:** [August 30, 2023, 1:33pm UTC](https://community.blockcerts.org/t/computed-hash-does-not-match-remote-hash/3465 "2023-08-30T13:33:25Z")
Hello I have created a certificate and signed it with cert-issuer. I have obtained the hash of the transaction and verified that it was done correctly, but when I verify the certificate from the blockcerts site or from… --- ## [Error signing certificates](https://community.blockcerts.org/t/error-signing-certificates/3459)
**Author:** [@ely](https://community.blockcerts.org/u/ely)\ **Replies:** 1\ **Last updated:** [August 18, 2023, 7:04am UTC](https://community.blockcerts.org/t/error-signing-certificates/3459 "2023-08-18T07:04:28Z")
Im trying to create a certificate. I’m using cert-issuer and usign this command: python cert\_issuer -c conf.ini After that, i’m getting the following error: (env) C:\\Users\\Lenovo\\Desktop\\blockchain\\cert-issuer\>python… --- ## [How to get stared with blockcerts?](https://community.blockcerts.org/t/how-to-get-stared-with-blockcerts/3458)
**Author:** [@ely](https://community.blockcerts.org/u/ely)\ **Replies:** 1\ **Last updated:** [August 18, 2023, 7:02am UTC](https://community.blockcerts.org/t/how-to-get-stared-with-blockcerts/3458 "2023-08-18T07:02:29Z")
Hello! I just found blockcerts and want to try it, but I’ve been having a lot of problems. I can get cert-tools to work, but I haven’t been able to get the cert-issuer to run. I am finding bug after bug. Can someone … --- ## [Fail to add credential V3 on Android Blockcert Wallet](https://community.blockcerts.org/t/fail-to-add-credential-v3-on-android-blockcert-wallet/3457)
**Author:** [@ultrabalad](https://community.blockcerts.org/u/ultrabalad)\ **Replies:** 1\ **Last updated:** [August 18, 2023, 6:57am UTC](https://community.blockcerts.org/t/fail-to-add-credential-v3-on-android-blockcert-wallet/3457 "2023-08-18T06:57:38Z")
Hi, I’m working on Blockcerts V3. I can verify the certificate on the website blockcerts.org. However, I failed to add the certificate to the Android Blockcerts Wallet. Is there any attribute I’m missing to add on the c… --- ## [Can someone please help me?timeout on transient error: Could not connect to the server 127.0.0.1:8332](https://community.blockcerts.org/t/can-someone-please-help-me-timeout-on-transient-error-could-not-connect-to-the-server-127-0-0-1-8332/3438)
**Author:** [@szjia](https://community.blockcerts.org/u/szjia)\ **Replies:** 0\ **Last updated:** [July 6, 2023, 1:02pm UTC](https://community.blockcerts.org/t/can-someone-please-help-me-timeout-on-transient-error-could-not-connect-to-the-server-127-0-0-1-8332/3438 "2023-07-06T13:02:14Z")
I use CENTOS to test cert-issuer, I use vi /root/.bitcoin/bitcoin.conf, add fallbackfee=0.00001 in bitcoin.conf and save it, execute bitcoind -daemon=/root/.bitcoin/bitcoin.conf, use bitcoin-cli sendtoaddress $ Issuer 5… --- ## [Verification site failed to process](https://community.blockcerts.org/t/verification-site-failed-to-process/3397)
**Author:** [@yahigel](https://community.blockcerts.org/u/yahigel)\ **Replies:** 0\ **Last updated:** [April 24, 2023, 8:03am UTC](https://community.blockcerts.org/t/verification-site-failed-to-process/3397 "2023-04-24T08:03:19Z")
To the administrator of the verification site, I attempted to verify a JSON certificate issued in BlockcertsV2 format on the verification site (https://www.blockcerts.org/), but received the following error message and … --- ## [Certificate is valid even if we change the additional fields data in blockchain certificate](https://community.blockcerts.org/t/certificate-is-valid-even-if-we-change-the-additional-fields-data-in-blockchain-certificate/3316)
**Author:** [@sreenumalae](https://community.blockcerts.org/u/sreenumalae)\ **Replies:** 1\ **Last updated:** [November 18, 2022, 12:37pm UTC](https://community.blockcerts.org/t/certificate-is-valid-even-if-we-change-the-additional-fields-data-in-blockchain-certificate/3316 "2022-11-18T12:37:38Z")
@lemoustachiste I have created the certificate using the cert-tools and here is my unsigned certificate {"@context": \["https://www.w3.org/2018/credentials/v1", {"alumniOf": {"@id": "http://schema.org/alumniOf", "@type… --- ## [How to create a valid issuer?](https://community.blockcerts.org/t/how-to-create-a-valid-issuer/3113)
**Author:** [@juaneltemible](https://community.blockcerts.org/u/juaneltemible)\ **Replies:** 21\ **Last updated:** [November 18, 2022, 12:34pm UTC](https://community.blockcerts.org/t/how-to-create-a-valid-issuer/3113 "2022-11-18T12:34:53Z")
Hello, I’m having a problem with the validation of a certificate, I’m able to issue a certificate to the ethereum ropsten chain, but when I try to validate it I keep getting this error: I’ve also tried changing the i… --- ## [The cert-issuer failed while building docker image](https://community.blockcerts.org/t/the-cert-issuer-failed-while-building-docker-image/3246)
**Author:** [@mary.tellez](https://community.blockcerts.org/u/mary.tellez)\ **Replies:** 3\ **Last updated:** [October 20, 2022, 1:54pm UTC](https://community.blockcerts.org/t/the-cert-issuer-failed-while-building-docker-image/3246 "2022-10-20T13:54:40Z")
The cert-issuer failed while building docker image: Error: Config setting for -rpcport only applied on regtest network when in \[regtest\] section. Please help --- ## [Wallet Verification Ethereum Testnet Error](https://community.blockcerts.org/t/wallet-verification-ethereum-testnet-error/3255)
**Author:** [@mary.tellez](https://community.blockcerts.org/u/mary.tellez)\ **Replies:** 4\ **Last updated:** [July 13, 2022, 8:41pm UTC](https://community.blockcerts.org/t/wallet-verification-ethereum-testnet-error/3255 "2022-07-13T20:41:56Z")
Hello, when I create my signed certificate with the cert-issuer tool and import it into my wallet, after clicking on the verify option, it returns this: What does this means. Please, help. [Next page](https://community.blockcerts.org/c/support/12.md?page=1)