# Latest **URL:** https://community.blockcerts.org/latest.md?page=1 [Latest](https://community.blockcerts.org/latest.md) · [Categories](https://community.blockcerts.org/categories.md) **Page:** 2 --- ## [Does Blockcerts supports Off-Chain storage solution?](https://community.blockcerts.org/t/does-blockcerts-supports-off-chain-storage-solution/3629)
**Author:** [@pmohite13](https://community.blockcerts.org/u/pmohite13)\ **Replies:** 0\ **Last updated:** [August 9, 2024, 7:41pm UTC](https://community.blockcerts.org/t/does-blockcerts-supports-off-chain-storage-solution/3629 "2024-08-09T19:41:48Z")
I am new to blockchain technology so please excuse my basic question. Does Blockcerts supports any other little less expensive chains then bitcoin or Ethereum in terms of transaction and other fees? Or may be hybrid solu… --- ## [Adding additional fields (cert-tools)](https://community.blockcerts.org/t/adding-additional-fields-cert-tools/1073)
**Author:** [@arbmos](https://community.blockcerts.org/u/arbmos)\ **Replies:** 2\ **Last updated:** [August 9, 2024, 1:34pm UTC](https://community.blockcerts.org/t/adding-additional-fields-cert-tools/1073 "2024-08-09T13:34:13Z")
Fields in CSV: \[imagen\] Additional fields line in conf.ini: additional\_per\_recipient\_fields = {“fields”: \[{“path”: “.course","value": "\*|COURSE|\*","csv\_column": "course"},{"path": ".subject”,“value”: “|SUBJECT|”,“csv\_… --- ## [Cost analysis for universities of implementing a proof of certification system on blockchains](https://community.blockcerts.org/t/cost-analysis-for-universities-of-implementing-a-proof-of-certification-system-on-blockchains/942)
**Author:** [@Emanuel](https://community.blockcerts.org/u/Emanuel)\ **Replies:** 10\ **Last updated:** [July 13, 2024, 4:40pm UTC](https://community.blockcerts.org/t/cost-analysis-for-universities-of-implementing-a-proof-of-certification-system-on-blockchains/942 "2024-07-13T16:40:17Z")
Hey, My name is Emanuel Groh and I am currently writing a thesis at the German university WHU-Otto-Beisheim School of Management, on the subject “Proof of certification through blockchain technology”. Under the supervi… --- ## [Could Someone Help me Research the use of Blockcerts for Secure Academic Qualification Confirmation?](https://community.blockcerts.org/t/could-someone-help-me-research-the-use-of-blockcerts-for-secure-academic-qualification-confirmation/3608)
**Author:** [@Helen](https://community.blockcerts.org/u/Helen)\ **Replies:** 2\ **Last updated:** [July 13, 2024, 1:57pm UTC](https://community.blockcerts.org/t/could-someone-help-me-research-the-use-of-blockcerts-for-secure-academic-qualification-confirmation/3608 "2024-07-13T13:57:44Z")
Hello everyone :slightly\_smiling\_face: I hope you are well.I am an educational technology lover who is now developing creative methods for secure and confirmed educational approval. I recently discovered blockcerts and … --- ## [Blockcerts Ethereum connection](https://community.blockcerts.org/t/blockcerts-ethereum-connection/3482)
**Author:** [@ely](https://community.blockcerts.org/u/ely)\ **Replies:** 2\ **Last updated:** [July 13, 2024, 8:37am UTC](https://community.blockcerts.org/t/blockcerts-ethereum-connection/3482 "2024-07-13T08:37:48Z")
Hello, I have a question. I want to know if someone could explain to me how blockcerts makes its connection with Ethereum. How does its connection with a node to be able to carry out transactions? Can I connect Blockcer… --- ## [The difficulty of providing Blockcerts Issuance to a university](https://community.blockcerts.org/t/the-difficulty-of-providing-blockcerts-issuance-to-a-university/2171)
**Author:** [@Kienle](https://community.blockcerts.org/u/Kienle)\ **Replies:** 7\ **Last updated:** [July 13, 2024, 5:38am UTC](https://community.blockcerts.org/t/the-difficulty-of-providing-blockcerts-issuance-to-a-university/2171 "2024-07-13T05:38:02Z")
Hi guys, I come from VietNam and I am so excited about the digital certificate based on blockchain. I was to create the project related to this above field. You can tell me how to apply blockcert as commercial project i… --- ## [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… --- ## [Create Certificate Template](https://community.blockcerts.org/t/create-certificate-template/3530)
**Author:** [@Popi](https://community.blockcerts.org/u/Popi)\ **Replies:** 4\ **Last updated:** [June 24, 2024, 6:11pm UTC](https://community.blockcerts.org/t/create-certificate-template/3530 "2024-06-24T18:11:56Z")
Good morning, I am communicating from Argentina. At the university where I study we are implementing Blockcert, we have a problem because we do not know how to create a special university template and be able to download… --- ## [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. --- ## [Blockcerts V3 release](https://community.blockcerts.org/t/blockcerts-v3-release/3022)
**Author:** [@lemoustachiste](https://community.blockcerts.org/u/lemoustachiste)\ **Replies:** 9\ **Last updated:** [June 5, 2024, 6:40am UTC](https://community.blockcerts.org/t/blockcerts-v3-release/3022 "2024-06-05T06:40:24Z")
Hi community, we are pleased to announce that V3 is fully released and available for consumption. The main change is the alignment with the W3C Verifiable Credentials specification. Regarding the standard itself metad… --- ## [Service Endpoint for BlockCerts in W3C DID Document](https://community.blockcerts.org/t/service-endpoint-for-blockcerts-in-w3c-did-document/3597)
**Author:** [@garyrob](https://community.blockcerts.org/u/garyrob)\ **Replies:** 1\ **Last updated:** [June 3, 2024, 10:01am UTC](https://community.blockcerts.org/t/service-endpoint-for-blockcerts-in-w3c-did-document/3597 "2024-06-03T10:01:43Z")
If I have a W3C DID Document and I want to have a serviceEndpoint that points to a BlockCerts credential such as MIT’s digital diploma, chatGPT suggests something along the lines of the following. I’m wondering if that’s… --- ## [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 … --- ## [Failed JSON-LD normalization](https://community.blockcerts.org/t/failed-json-ld-normalization/3509)
**Author:** [@dannysuarez](https://community.blockcerts.org/u/dannysuarez)\ **Replies:** 9\ **Last updated:** [March 7, 2024, 1:04pm UTC](https://community.blockcerts.org/t/failed-json-ld-normalization/3509 "2024-03-07T13:04:40Z")
Hi guys, In your recent blockcerts-verifier version 1.57.2 we are getting the following error Failed JSON-LD normalization . We were searching for details and we found a solution🙂. If you remove the publicKey attribute… --- ## [displayHTML- "some html code":SOLVED](https://community.blockcerts.org/t/displayhtml-some-html-code-solved/2384)
**Author:** [@raymondfx](https://community.blockcerts.org/u/raymondfx)\ **Replies:** 6\ **Last updated:** [February 23, 2024, 1:03pm UTC](https://community.blockcerts.org/t/displayhtml-some-html-code-solved/2384 "2024-02-23T13:03:29Z")
I managed to create and issue certs, now how do I fix this, I need to render the Cert details but it seems displayHTMl not working or i do not understand --- ## [Docker build -t bc/cert-issuer:1.0 setup](https://community.blockcerts.org/t/docker-build-t-bc-cert-issuer-1-0-setup/3567)
**Author:** [@kimbugweronnie](https://community.blockcerts.org/u/kimbugweronnie)\ **Replies:** 0\ **Last updated:** [February 23, 2024, 5:10am UTC](https://community.blockcerts.org/t/docker-build-t-bc-cert-issuer-1-0-setup/3567 "2024-02-23T05:10:59Z")
Am getting this error when i run docker build -t bc/cert-issuer:1.0 .I need help --- ## [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… --- ## [Cert-tools V3 credential](https://community.blockcerts.org/t/cert-tools-v3-credential/3295)
**Author:** [@mary.tellez](https://community.blockcerts.org/u/mary.tellez)\ **Replies:** 6\ **Last updated:** [January 23, 2024, 4:11pm UTC](https://community.blockcerts.org/t/cert-tools-v3-credential/3295 "2024-01-23T16:11:41Z")
Hello!: When i try instantiate-certificate-batch -c conf.ini with the default config returns cert\_schema.errors.BlockcertValidationError: ‘nonce’ is a required property Please help. --- ## [Is Blockchain Technology Safe for Issuing Digital Certificates and Badges](https://community.blockcerts.org/t/is-blockchain-technology-safe-for-issuing-digital-certificates-and-badges/3497)
**Author:** [@Suryanm1090](https://community.blockcerts.org/u/Suryanm1090)\ **Replies:** 1\ **Last updated:** [January 17, 2024, 2:12pm UTC](https://community.blockcerts.org/t/is-blockchain-technology-safe-for-issuing-digital-certificates-and-badges/3497 "2024-01-17T14:12:24Z")
The safety and security of blockchain technology for issuing digital certificates and badges are key concerns in today’s increasingly digital and credential-driven world. Blockchain, known for its decentralized, transpar… --- ## [Help Needed with Blockcerts Universal Verifier for Japan Open Chain](https://community.blockcerts.org/t/help-needed-with-blockcerts-universal-verifier-for-japan-open-chain/3539)
**Author:** [@joc\_sean](https://community.blockcerts.org/u/joc_sean)\ **Replies:** 3\ **Last updated:** [January 8, 2024, 12:55pm UTC](https://community.blockcerts.org/t/help-needed-with-blockcerts-universal-verifier-for-japan-open-chain/3539 "2024-01-08T12:55:20Z")
Hi Blockcerts Community, We’ve integrated Blockcerts with our blockchain, Japan Open Chain, and are encountering issues with the Blockcerts Universal Verifier. When we input our URL into the verifier, it fails to recogn… --- ## [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-tools error: AttributeError: 'str' object has no attribute 'isoformat'. Did you mean: 'format'?](https://community.blockcerts.org/t/cert-tools-error-attributeerror-str-object-has-no-attribute-isoformat-did-you-mean-format/3222)
**Author:** [@jhdezctza](https://community.blockcerts.org/u/jhdezctza)\ **Replies:** 7\ **Last updated:** [October 29, 2023, 3:36pm UTC](https://community.blockcerts.org/t/cert-tools-error-attributeerror-str-object-has-no-attribute-isoformat-did-you-mean-format/3222 "2023-10-29T15:36:53Z")
help me please: cert-tools error AttributeError: ‘str’ object has no attribute ‘isoformat’. Did you mean: ‘format’? --- ## [Avoiding malicious transactions to be added in blockchain](https://community.blockcerts.org/t/avoiding-malicious-transactions-to-be-added-in-blockchain/948)
**Author:** [@vivekmaran](https://community.blockcerts.org/u/vivekmaran)\ **Replies:** 4\ **Last updated:** [October 8, 2023, 8:24pm UTC](https://community.blockcerts.org/t/avoiding-malicious-transactions-to-be-added-in-blockchain/948 "2023-10-08T20:24:08Z")
Hi, I went through the technology in https://www.youtube.com/watch?v=cEo\_XwOpaow. It looks interesting. Thanks for sharing the knowledge to the world :clap:. However am curious to know how the following case is handled. … --- ## [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… --- ## [Professional licenses](https://community.blockcerts.org/t/professional-licenses/3467)
**Author:** [@Osler](https://community.blockcerts.org/u/Osler)\ **Replies:** 2\ **Last updated:** [September 1, 2023, 2:57pm UTC](https://community.blockcerts.org/t/professional-licenses/3467 "2023-09-01T14:57:23Z")
Question about credentials related to licenses, what happens if a license is expired, inactive, or terminated? Will the person be able to show they still have the credential even though they technically do not anymore? --- ## [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… [Previous page](https://community.blockcerts.org/latest.md) [Next page](https://community.blockcerts.org/latest.md?page=2)