# Latest **URL:** https://community.blockcerts.org/latest.md?page=2 [Latest](https://community.blockcerts.org/latest.md) · [Categories](https://community.blockcerts.org/categories.md) **Page:** 3 --- ## [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… --- ## [Chain property of the resulting Json when verifying the certificate is not formatted](https://community.blockcerts.org/t/chain-property-of-the-resulting-json-when-verifying-the-certificate-is-not-formatted/3447)
**Author:** [@SinuheCortes](https://community.blockcerts.org/u/SinuheCortes)\ **Replies:** 0\ **Last updated:** [July 28, 2023, 11:48pm UTC](https://community.blockcerts.org/t/chain-property-of-the-resulting-json-when-verifying-the-certificate-is-not-formatted/3447 "2023-07-28T23:48:46Z")
When i traying to verifier a certificate, the response json, has a property chain in text, not like property to read. I’m tried with sanitizer, but it doesnt work. Path to property is the final verification status Json… --- ## [Is this GDPR compliant?](https://community.blockcerts.org/t/is-this-gdpr-compliant/3444)
**Author:** [@Stuart](https://community.blockcerts.org/u/Stuart)\ **Replies:** 1\ **Last updated:** [July 13, 2023, 1:07pm UTC](https://community.blockcerts.org/t/is-this-gdpr-compliant/3444 "2023-07-13T13:07:00Z")
It is my understanding that hashed data is still included as personal data under GDPR. As the data is being stored on the block chain doesn’t that mean the system will not be GDPR compliant as it’s not possible to delete… --- ## [How to ensure the legitimacy of did](https://community.blockcerts.org/t/how-to-ensure-the-legitimacy-of-did/3433)
**Author:** [@H-I](https://community.blockcerts.org/u/H-I)\ **Replies:** 2\ **Last updated:** [July 10, 2023, 2:00am UTC](https://community.blockcerts.org/t/how-to-ensure-the-legitimacy-of-did/3433 "2023-07-10T02:00:05Z")
How to ensure the legitimacy of did? For example, in the case of “did:web”, I think you can judge by the domain name. However, if a malicious third party acquires a domain with a similar name, the user may spoof it wit… --- ## [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… --- ## [Getting an error when i try to instantiate\_certificate\_batch.py in cert\_tools repo](https://community.blockcerts.org/t/getting-an-error-when-i-try-to-instantiate-certificate-batch-py-in-cert-tools-repo/3435)
**Author:** [@josephwambicho](https://community.blockcerts.org/u/josephwambicho)\ **Replies:** 1\ **Last updated:** [July 5, 2023, 1:38pm UTC](https://community.blockcerts.org/t/getting-an-error-when-i-try-to-instantiate-certificate-batch-py-in-cert-tools-repo/3435 "2023-07-05T13:38:17Z")
when i run “instantiate-certificate-batch -c conf.ini” in the cert\_tools repository iam getting this error raceback (most recent call last): File “/home/jose/.local/bin/instantiate-certificate-batch”, line 8, in sys.… --- ## [Blockcert Issue Cost](https://community.blockcerts.org/t/blockcert-issue-cost/3428)
**Author:** [@kyaaqba](https://community.blockcerts.org/u/kyaaqba)\ **Replies:** 0\ **Last updated:** [June 22, 2023, 1:38pm UTC](https://community.blockcerts.org/t/blockcert-issue-cost/3428 "2023-06-22T13:38:42Z")
I want to ask how much it costs these days to issue a certificate, using Bitcoin and Ethereum? and is batching more certificates an excellent idea to lower cost? Thanks, Karam Yaaqba --- ## [Is recipient wallet necessary?](https://community.blockcerts.org/t/is-recipient-wallet-necessary/3418)
**Author:** [@kyaaqba](https://community.blockcerts.org/u/kyaaqba)\ **Replies:** 4\ **Last updated:** [May 31, 2023, 11:21am UTC](https://community.blockcerts.org/t/is-recipient-wallet-necessary/3418 "2023-05-31T11:21:41Z")
Hey, I am trying to create a certificate issuer for kids in schools, and they don’t have digital wallets. Do I need the recipient’s wallet keys to sign a certificate or it can be a standalone system without the recipien… --- ## [Mexican State University wants to issue Digital Credential in their language accreditations](https://community.blockcerts.org/t/mexican-state-university-wants-to-issue-digital-credential-in-their-language-accreditations/3413)
**Author:** [@JoshueG](https://community.blockcerts.org/u/JoshueG)\ **Replies:** 0\ **Last updated:** [May 12, 2023, 8:02pm UTC](https://community.blockcerts.org/t/mexican-state-university-wants-to-issue-digital-credential-in-their-language-accreditations/3413 "2023-05-12T20:02:36Z")
Hi there; I hope you’re doing well. I’m currently pursuing a Master’s degree in Technology in Knowledge Management, and for my final project, I am eager to explore the implementation of Blockcert as a digital credential… --- ## [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 … --- ## [Sale Offer For Community Members](https://community.blockcerts.org/t/sale-offer-for-community-members/3396)
**Author:** [@Ralph](https://community.blockcerts.org/u/Ralph)\ **Replies:** 0\ **Last updated:** [April 22, 2023, 6:43am UTC](https://community.blockcerts.org/t/sale-offer-for-community-members/3396 "2023-04-22T06:43:35Z")
Hello all. I am selling STX at presale price, just doing this to help the community members in acquiring more STX as I am one of the earliest investors. STX is a beautiful investment and mechanism and I may not be alive … --- ## [Is there anyway to view your certificates if the issuer's site is down?](https://community.blockcerts.org/t/is-there-anyway-to-view-your-certificates-if-the-issuers-site-is-down/3393)
**Author:** [@chewie](https://community.blockcerts.org/u/chewie)\ **Replies:** 1\ **Last updated:** [April 21, 2023, 10:50am UTC](https://community.blockcerts.org/t/is-there-anyway-to-view-your-certificates-if-the-issuers-site-is-down/3393 "2023-04-21T10:50:36Z")
Hey, I got a certificate back in 2018 from a coding bootcamp. It looks like their site is now down. I’m 80% sure I know the correct hash (the wallet they were using was in a public slide deck and the transaction time i… --- ## [About the verification process](https://community.blockcerts.org/t/about-the-verification-process/3364)
**Author:** [@Norihiro](https://community.blockcerts.org/u/Norihiro)\ **Replies:** 2\ **Last updated:** [February 14, 2023, 1:23am UTC](https://community.blockcerts.org/t/about-the-verification-process/3364 "2023-02-14T01:23:06Z")
Please excuse my poor English. The verification process says it verifies Merkle proofs, is this the process used when creating in batch? If you use one certificate for one blockchain transaction, do you just verify the… --- ## [Introducing Smart Contracts to BlockCerts](https://community.blockcerts.org/t/introducing-smart-contracts-to-blockcerts/2362)
**Author:** [@BlockCertsSmartContr](https://community.blockcerts.org/u/BlockCertsSmartContr)\ **Replies:** 1\ **Last updated:** [January 21, 2023, 6:41am UTC](https://community.blockcerts.org/t/introducing-smart-contracts-to-blockcerts/2362 "2023-01-21T06:41:48Z")
Introducing Smart Contracts to BlockCerts by Ahmet Kilic, Xenia Melman, Klea Paci, Marc Radau, Florian Weiß Project Intro We have the pleasure to share the result of a university student project at the department for In… --- ## [What is sign\_certificate method](https://community.blockcerts.org/t/what-is-sign-certificate-method/3343)
**Author:** [@takeura](https://community.blockcerts.org/u/takeura)\ **Replies:** 2\ **Last updated:** [January 3, 2023, 12:58pm UTC](https://community.blockcerts.org/t/what-is-sign-certificate-method/3343 "2023-01-03T12:58:21Z")
I am reading the python cert-issuer code in the repository, the sign\_certificate method is pass, is there a sample about this? --- ## [Verifier implementation](https://community.blockcerts.org/t/verifier-implementation/3344)
**Author:** [@takeura](https://community.blockcerts.org/u/takeura)\ **Replies:** 1\ **Last updated:** [January 3, 2023, 1:06pm UTC](https://community.blockcerts.org/t/verifier-implementation/3344 "2023-01-03T13:06:46Z")
Is there any difference between the Blockcerts Universal Verifier at blockcerts.org and the implementation of cert-verifier(python) in the repository? --- ## [Error generating test.json file . cert-tools :: the following arguments are required: --issuer\_id](https://community.blockcerts.org/t/error-generating-test-json-file-cert-tools-the-following-arguments-are-required-issuer-id/2727)
**Author:** [@nitinb](https://community.blockcerts.org/u/nitinb)\ **Replies:** 9\ **Last updated:** [January 3, 2023, 1:03pm UTC](https://community.blockcerts.org/t/error-generating-test-json-file-cert-tools-the-following-arguments-are-required-issuer-id/2727 "2023-01-03T13:03:10Z")
I am trying to create test.json file in cert-tools rep. I used create-certificate-template -c conf.ini to generate but got following error- usage: create-certificate-template \[-h\] \[-c MY\_CONFIG\] \[–data\_dir DATA\_DIR\] … --- ## [Hash value is a personal information or not?](https://community.blockcerts.org/t/hash-value-is-a-personal-information-or-not/3338)
**Author:** [@mitsuinjpn](https://community.blockcerts.org/u/mitsuinjpn)\ **Replies:** 2\ **Last updated:** [December 26, 2022, 9:06am UTC](https://community.blockcerts.org/t/hash-value-is-a-personal-information-or-not/3338 "2022-12-26T09:06:49Z")
When personal information is included in a certificate created by Blockcerts, it is considered to be personal information under Japanese law, even if it is converted to a hash value. Therefore, we have been instructed by… --- ## [Specific specifications](https://community.blockcerts.org/t/specific-specifications/3336)
**Author:** [@takeura](https://community.blockcerts.org/u/takeura)\ **Replies:** 1\ **Last updated:** [December 8, 2022, 1:17pm UTC](https://community.blockcerts.org/t/specific-specifications/3336 "2022-12-08T13:17:10Z")
Where can I find specific specifications other than schema to build a blockcerts compliant system? --- ## [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… --- ## [ReferenceError: self is not defined](https://community.blockcerts.org/t/referenceerror-self-is-not-defined/3212)
**Author:** [@abriceno](https://community.blockcerts.org/u/abriceno)\ **Replies:** 4\ **Last updated:** [November 2, 2022, 11:26am UTC](https://community.blockcerts.org/t/referenceerror-self-is-not-defined/3212 "2022-11-02T11:26:01Z")
Hi all, I am running the server.js sample code for NodeJS and I get the following error: /cert-blockchain/node\_modules/@blockcerts/hashlink-verifier/lib/cjs/hashlink/crypto-browser.js:5 exports.default = (self.crypto ||… --- ## [Facing error in "bitcoin-cli -generate 101"](https://community.blockcerts.org/t/facing-error-in-bitcoin-cli-generate-101/3311)
**Author:** [@Sanchay](https://community.blockcerts.org/u/Sanchay)\ **Replies:** 0\ **Last updated:** [October 30, 2022, 1:49pm UTC](https://community.blockcerts.org/t/facing-error-in-bitcoin-cli-generate-101/3311 "2022-10-30T13:49:40Z")
I have followed all the steps before generating bitcoins , I have created the wallet using the createwallet command , but unlike in the steps where wallet is created insted ‘regtest’ mine is created directly under .bitco… --- ## [Found unmapped fields during JSON-LD normalization](https://community.blockcerts.org/t/found-unmapped-fields-during-json-ld-normalization/2405)
**Author:** [@dekts](https://community.blockcerts.org/u/dekts)\ **Replies:** 4\ **Last updated:** [October 26, 2022, 1:03pm UTC](https://community.blockcerts.org/t/found-unmapped-fields-during-json-ld-normalization/2405 "2022-10-26T13:03:46Z")
I’m getting the error while I’m going to verify it from web browser (https://www.blockcerts.org/) I have added the additional fields in the manner of below example: additional\_per\_recipient\_fields = {"fields": \[{"path"… --- ## [Why is this not a valid Blockcerts credential?](https://community.blockcerts.org/t/why-is-this-not-a-valid-blockcerts-credential/3305)
**Author:** [@pcoyne](https://community.blockcerts.org/u/pcoyne)\ **Replies:** 1\ **Last updated:** [October 26, 2022, 10:49am UTC](https://community.blockcerts.org/t/why-is-this-not-a-valid-blockcerts-credential/3305 "2022-10-26T10:49:40Z")
After setting up an environment, and addressing a couple of changes documented on this forum I was able to create a new certiticate template, instatiate a batch using the test roster file. I moved the unsigned certificat… --- ## [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 --- ## [\[V3\] Errors with cert-issuer on Docker](https://community.blockcerts.org/t/v3-errors-with-cert-issuer-on-docker/3301)
**Author:** [@dallarosa](https://community.blockcerts.org/u/dallarosa)\ **Replies:** 2\ **Last updated:** [October 19, 2022, 5:14pm UTC](https://community.blockcerts.org/t/v3-errors-with-cert-issuer-on-docker/3301 "2022-10-19T17:14:54Z")
Hi everyone, I’m creating a new product and I’m looking to have Blockcerts to be a part of it. I’m trying to run the cert-issuer but I’m having problems with the instructions in the repo’s README. When I run docker ru… --- ## [Blockchain-based certificate...useless?](https://community.blockcerts.org/t/blockchain-based-certificate-useless/473)
**Author:** [@mae04035](https://community.blockcerts.org/u/mae04035)\ **Replies:** 12\ **Last updated:** [October 19, 2022, 4:59pm UTC](https://community.blockcerts.org/t/blockchain-based-certificate-useless/473 "2022-10-19T16:59:38Z")
Hi I’ve recently become very interested in Blockcert’s approach on issuing digital certificates. I just have a quick question. If checking the issuing organization is solely (I might be wrong) based on checking the inpu… --- ## [\[ethereum\_ropsten\] ModuleNotFoundError: No module named 'rlp'](https://community.blockcerts.org/t/ethereum-ropsten-modulenotfounderror-no-module-named-rlp/2754)
**Author:** [@nitinb](https://community.blockcerts.org/u/nitinb)\ **Replies:** 4\ **Last updated:** [October 17, 2022, 1:57pm UTC](https://community.blockcerts.org/t/ethereum-ropsten-modulenotfounderror-no-module-named-rlp/2754 "2022-10-17T13:57:51Z")
I am trying to issue certificate in ethereum ropsten testnet. But I am facing error- (venv) bash-4.3# pwd /cert-issuer (venv) bash-4.3# cert-issuer -c conf\_ethtest.ini WARNING - Your app is configured to skip the wifi… [Previous page](https://community.blockcerts.org/latest.md?page=1) [Next page](https://community.blockcerts.org/latest.md?page=3)