# Latest **URL:** https://community.blockcerts.org/latest.md?page=5 [Latest](https://community.blockcerts.org/latest.md) · [Categories](https://community.blockcerts.org/categories.md) **Page:** 6 --- ## [Neat project - token?](https://community.blockcerts.org/t/neat-project-token/2961)
**Author:** [@pascal](https://community.blockcerts.org/u/pascal)\ **Replies:** 1\ **Last updated:** [September 28, 2021, 1:58pm UTC](https://community.blockcerts.org/t/neat-project-token/2961 "2021-09-28T13:58:27Z")
Neat project. Are you guys planning on issuing a token, and what would the value proposition be for someone interested in acquiring it? --- ## [Blockcerts is dead](https://community.blockcerts.org/t/blockcerts-is-dead/2913)
**Author:** [@almosnow](https://community.blockcerts.org/u/almosnow)\ **Replies:** 1\ **Last updated:** [July 26, 2021, 9:24am UTC](https://community.blockcerts.org/t/blockcerts-is-dead/2913 "2021-07-26T09:24:19Z")
No community. Learning Machine is a for-profit corp. that doesn’t really care about this. Documentation is severely lacking, plus, what they offer is not really different than other alternatives. So long for me :wave:… --- ## [How to add PDF file into blockcert json file](https://community.blockcerts.org/t/how-to-add-pdf-file-into-blockcert-json-file/2669)
**Author:** [@sophie](https://community.blockcerts.org/u/sophie)\ **Replies:** 1\ **Last updated:** [September 22, 2021, 4:45pm UTC](https://community.blockcerts.org/t/how-to-add-pdf-file-into-blockcert-json-file/2669 "2021-09-22T16:45:31Z")
Our students are getting course certificates on pdf format. How to make that pdf to be used to issue certificates in Blockcert v2 --- ## [Would you build the whole think for me?](https://community.blockcerts.org/t/would-you-build-the-whole-think-for-me/2928)
**Author:** [@jvaldez](https://community.blockcerts.org/u/jvaldez)\ **Replies:** 0\ **Last updated:** [August 27, 2021, 10:53pm UTC](https://community.blockcerts.org/t/would-you-build-the-whole-think-for-me/2928 "2021-08-27T22:53:23Z")
Hello, if somebody its interested in making this blockcert work for a private school please respond. And whats your price? --- ## [Verifier Js Transaction not found](https://community.blockcerts.org/t/verifier-js-transaction-not-found/2949)
**Author:** [@oznfc](https://community.blockcerts.org/u/oznfc)\ **Replies:** 0\ **Last updated:** [September 13, 2021, 2:22pm UTC](https://community.blockcerts.org/t/verifier-js-transaction-not-found/2949 "2021-09-13T14:22:49Z")
{“error”: “Transaction 4fe246d60931cfe0bd00c24dc10048508a4723dcfa11f3451ba309e835cf151f not found.”} { code: ‘final’, status: ‘failure’, message: ‘The address used to issue this Blockcerts does not belong to the clai… --- ## [Winerror 126 trying to issue certificates](https://community.blockcerts.org/t/winerror-126-trying-to-issue-certificates/2931)
**Author:** [@jvaldez](https://community.blockcerts.org/u/jvaldez)\ **Replies:** 1\ **Last updated:** [September 2, 2021, 7:13pm UTC](https://community.blockcerts.org/t/winerror-126-trying-to-issue-certificates/2931 "2021-09-02T19:13:22Z")
Hello, im running a python virtual environment, im stuck in the process of issuing certificates, its giving me this error. (env) C:\\Users\\myuser\\env\\Scripts\\cert-issuer\>python cert\_issuer -c conf.ini WARNING - Your app… --- ## [Are V2 Blockcert Assertions Valid Open Badges](https://community.blockcerts.org/t/are-v2-blockcert-assertions-valid-open-badges/2752)
**Author:** [@ampatt97](https://community.blockcerts.org/u/ampatt97)\ **Replies:** 16\ **Last updated:** [August 31, 2021, 8:36pm UTC](https://community.blockcerts.org/t/are-v2-blockcert-assertions-valid-open-badges/2752 "2021-08-31T20:36:31Z")
From my testing it looks like the open badges specification doesn’t align with the V2 assertion because the badge ID is always set to urn:uuid:example. The open badge validator always rejects my assertions because it doe… --- ## [Am I understanding what really blockcert is about?](https://community.blockcerts.org/t/am-i-understanding-what-really-blockcert-is-about/2921)
**Author:** [@6eer](https://community.blockcerts.org/u/6eer)\ **Replies:** 2\ **Last updated:** [August 26, 2021, 3:14pm UTC](https://community.blockcerts.org/t/am-i-understanding-what-really-blockcert-is-about/2921 "2021-08-26T15:14:33Z")
Hi im 6eer, im trying to understand whats this projects really is about. This is kind of a w3c Verified Credential (VC) but stored into a blockchain? After read the VC spec, I found (maybe im wrong) that the way you ar… --- ## [The address used to issue this Blockcerts does not belong to the claimed issuer](https://community.blockcerts.org/t/the-address-used-to-issue-this-blockcerts-does-not-belong-to-the-claimed-issuer/2891)
**Author:** [@sreenumalae](https://community.blockcerts.org/u/sreenumalae)\ **Replies:** 8\ **Last updated:** [July 28, 2021, 11:04am UTC](https://community.blockcerts.org/t/the-address-used-to-issue-this-blockcerts-does-not-belong-to-the-claimed-issuer/2891 "2021-07-28T11:04:03Z")
Using Blockcerts Cert-Issuer I issued a certificate and I’m trying to verify the certificate using Blockerts-Verifier. When I upload the JSON file, I’m facing an issue as shown below The address used to issue this Bloc… --- ## [Generating recipient keys](https://community.blockcerts.org/t/generating-recipient-keys/1339)
**Author:** [@wabisabi](https://community.blockcerts.org/u/wabisabi)\ **Replies:** 4\ **Last updated:** [July 21, 2021, 7:12pm UTC](https://community.blockcerts.org/t/generating-recipient-keys/1339 "2021-07-21T19:12:33Z")
Dear colleagues, Please pardon my ignorance, I am pretty new to the blockchain world and blockcerts. I wonder if there is a way to simplify end-user experience by removing the requirement for the badge recipient to prov… --- ## [Typical transaction cost](https://community.blockcerts.org/t/typical-transaction-cost/2911)
**Author:** [@almosnow](https://community.blockcerts.org/u/almosnow)\ **Replies:** 0\ **Last updated:** [July 21, 2021, 2:52pm UTC](https://community.blockcerts.org/t/typical-transaction-cost/2911 "2021-07-21T14:52:10Z")
Hi, I was wondering if you could share the typical cost you are seeing when you issue a certificate. I know the answer is it depends, on the network you use, on the volume at the moment, on the price of the currency, e… --- ## [Social Share and Metadata in Blockcerts](https://community.blockcerts.org/t/social-share-and-metadata-in-blockcerts/2526)
**Author:** [@ampatt97](https://community.blockcerts.org/u/ampatt97)\ **Replies:** 5\ **Last updated:** [July 12, 2021, 12:51pm UTC](https://community.blockcerts.org/t/social-share-and-metadata-in-blockcerts/2526 "2021-07-12T12:51:00Z")
Can anyone offer advice/explanation on how the data needs to be inserted into your certificates to display the social share buttons and the metadata. I think it needs to be under metadataJson but haven’t had much success… --- ## [Verify ethereum certificate (ropsten)](https://community.blockcerts.org/t/verify-ethereum-certificate-ropsten/1065)
**Author:** [@jdelprado](https://community.blockcerts.org/u/jdelprado)\ **Replies:** 6\ **Last updated:** [June 30, 2021, 1:55pm UTC](https://community.blockcerts.org/t/verify-ethereum-certificate-ropsten/1065 "2021-06-30T13:55:03Z")
Hello, I have a problem verifying a certificate generated with cert-issuer. I’m trying to verify it with its online verifier, but it gives me an error. \[Captura%20de%20pantalla%20de%202018-05-25%2000-17-55\] In the co… --- ## [Multiple Issuers](https://community.blockcerts.org/t/multiple-issuers/2899)
**Author:** [@sreenumalae](https://community.blockcerts.org/u/sreenumalae)\ **Replies:** 0\ **Last updated:** [June 29, 2021, 3:21pm UTC](https://community.blockcerts.org/t/multiple-issuers/2899 "2021-06-29T15:21:36Z")
Hello everyone, I’m Looking for a feature where a multi-tenant solution supporting multiple issuers that would allow multiple universities to generate/sign credentials with their key pairs. @kimitele @ampatt97 --- ## [AttributeError: 'CertificateBatchHandler' object has no attribute 'certificates\_to\_issue'](https://community.blockcerts.org/t/attributeerror-certificatebatchhandler-object-has-no-attribute-certificates-to-issue/1183)
**Author:** [@Taibah](https://community.blockcerts.org/u/Taibah)\ **Replies:** 3\ **Last updated:** [June 27, 2021, 8:51pm UTC](https://community.blockcerts.org/t/attributeerror-certificatebatchhandler-object-has-no-attribute-certificates-to-issue/1183 "2021-06-27T20:51:17Z")
Hello guys everytime i try to issue a certificate i get this error AttributeError: ‘CertificateBatchHandler’ object has no attribute ‘certificates\_to\_issue’ i tried changing the chain to reg and still also with the bit… --- ## [Storing Keys of Multiple Issuers](https://community.blockcerts.org/t/storing-keys-of-multiple-issuers/2215)
**Author:** [@amritnagra](https://community.blockcerts.org/u/amritnagra)\ **Replies:** 1\ **Last updated:** [June 27, 2021, 6:18pm UTC](https://community.blockcerts.org/t/storing-keys-of-multiple-issuers/2215 "2021-06-27T18:18:49Z")
Hi, I’m (newbie) trying to support a solution which would securely store the private and public key pairs of multiple issuers. Imagine a multi- tenant solution supporting multiple issuers that would allow multiple univer… --- ## [\[RESOLVED\] "Transaction occurred at time when issuing address was not considered valid."](https://community.blockcerts.org/t/resolved-transaction-occurred-at-time-when-issuing-address-was-not-considered-valid/1592)
**Author:** [@ppfish45](https://community.blockcerts.org/u/ppfish45)\ **Replies:** 6\ **Last updated:** [June 8, 2020, 6:11am UTC](https://community.blockcerts.org/t/resolved-transaction-occurred-at-time-when-issuing-address-was-not-considered-valid/1592 "2020-06-08T06:11:51Z")
Hi everyone, Recently I am trying to deploy my first blockcert from the scratch. And here is roughly what I have done: Generated a wallet address (as well as the private key) on the bitcoin testate Created an issu… --- ## [Issuer Profile hosted url](https://community.blockcerts.org/t/issuer-profile-hosted-url/939)
**Author:** [@praveenpatel](https://community.blockcerts.org/u/praveenpatel)\ **Replies:** 3\ **Last updated:** [April 9, 2018, 7:43pm UTC](https://community.blockcerts.org/t/issuer-profile-hosted-url/939 "2018-04-09T19:43:07Z")
Why we use issuer profile hosted url? If issuer profile is only used for validation of publicKey(Authenticity), can we append issuer publicKey in blockchain certificate and verify it without depending on issuer hosted U… --- ## [Tool for mailing out certificates and add issuer introductions](https://community.blockcerts.org/t/tool-for-mailing-out-certificates-and-add-issuer-introductions/1441)
**Author:** [@stuartf](https://community.blockcerts.org/u/stuartf)\ **Replies:** 2\ **Last updated:** [June 16, 2021, 8:04pm UTC](https://community.blockcerts.org/t/tool-for-mailing-out-certificates-and-add-issuer-introductions/1441 "2021-06-16T20:04:01Z")
For a while we’ve been using a combination of Google Forms and manual authoring to send our small sets of certificates and add-issuer emails. Over the last couple days I’ve written a tool to use sendgrid and csvs to buil… --- ## [Using custom remote contexts](https://community.blockcerts.org/t/using-custom-remote-contexts/2764)
**Author:** [@ampatt97](https://community.blockcerts.org/u/ampatt97)\ **Replies:** 10\ **Last updated:** [June 16, 2021, 6:04pm UTC](https://community.blockcerts.org/t/using-custom-remote-contexts/2764 "2021-06-16T18:04:17Z")
Any advice on adding my own contexts remotely to my credentials? Whenever I try to implement credentials with my own context I receive a jsonld error pyld.jsonld.JsonLdError: ('Could not retrieve a JSON-LD document fro… --- ## [Issueing and holding ethereum based certificate Needs clear documentation](https://community.blockcerts.org/t/issueing-and-holding-ethereum-based-certificate-needs-clear-documentation/2878)
**Author:** [@testemailid9101](https://community.blockcerts.org/u/testemailid9101)\ **Replies:** 5\ **Last updated:** [June 10, 2021, 11:56am UTC](https://community.blockcerts.org/t/issueing-and-holding-ethereum-based-certificate-needs-clear-documentation/2878 "2021-06-10T11:56:07Z")
Hi there, Can the existing repository is working with verifying and holding ethereum based certificate? --- ## [\[SOLVED\] Android app verify certs on Ethereum?](https://community.blockcerts.org/t/solved-android-app-verify-certs-on-ethereum/1134)
**Author:** [@leozhan](https://community.blockcerts.org/u/leozhan)\ **Replies:** 7\ **Last updated:** [June 9, 2021, 5:05am UTC](https://community.blockcerts.org/t/solved-android-app-verify-certs-on-ethereum/1134 "2021-06-09T05:05:50Z")
Can someone confirm if the Android app currently is capable of doing this? It doesn’t seem to work on my end. --- ## [Blockcerts verifier requires api key?](https://community.blockcerts.org/t/blockcerts-verifier-requires-api-key/2882)
**Author:** [@testemailid9101](https://community.blockcerts.org/u/testemailid9101)\ **Replies:** 2\ **Last updated:** [June 7, 2021, 11:58am UTC](https://community.blockcerts.org/t/blockcerts-verifier-requires-api-key/2882 "2021-06-07T11:58:07Z")
Does block certs verifiier GitHub - blockchain-certificates/blockcerts-verifier: A Blockcerts verifier and viewer requires api key? when i run it to verify transaction it returns transaction for the first time but for s… --- ## [Public key required in cert issuer](https://community.blockcerts.org/t/public-key-required-in-cert-issuer/2884)
**Author:** [@testemailid9101](https://community.blockcerts.org/u/testemailid9101)\ **Replies:** 0\ **Last updated:** [June 7, 2021, 11:31am UTC](https://community.blockcerts.org/t/public-key-required-in-cert-issuer/2884 "2021-06-07T11:31:45Z")
Is the public key required for the recipient to get the certificate issued? can we use just the email id or some unique id (say college id/student id) only to issue certificate? Please point towards or suggest how that c… --- ## [PubKey / Passphrase](https://community.blockcerts.org/t/pubkey-passphrase/2862)
**Author:** [@LSmith](https://community.blockcerts.org/u/LSmith)\ **Replies:** 0\ **Last updated:** [May 19, 2021, 2:38pm UTC](https://community.blockcerts.org/t/pubkey-passphrase/2862 "2021-05-19T14:38:48Z")
I have recently got the hang of creating certificate templates with cert-tools, issuing them onto the bitcoin testnet chain with cert-issuer, and verifying them on the Blockcerts homepage. I am now trying to add one of … --- ## [Revocation List](https://community.blockcerts.org/t/revocation-list/2877)
**Author:** [@ampatt97](https://community.blockcerts.org/u/ampatt97)\ **Replies:** 0\ **Last updated:** [June 3, 2021, 12:12am UTC](https://community.blockcerts.org/t/revocation-list/2877 "2021-06-03T00:12:56Z")
Struggling to revoke certificates properly. I have an object in the revokedAssertions array at my revocation url with the id set to the assertion url. Is this the correct approach. Thanks Edit: Solved, I guess my bro… --- ## [iOS wallet not importing v2 ethereum-ropsten certs](https://community.blockcerts.org/t/ios-wallet-not-importing-v2-ethereum-ropsten-certs/1351)
**Author:** [@mlisle](https://community.blockcerts.org/u/mlisle)\ **Replies:** 6\ **Last updated:** [September 11, 2018, 9:09pm UTC](https://community.blockcerts.org/t/ios-wallet-not-importing-v2-ethereum-ropsten-certs/1351 "2018-09-11T21:09:35Z")
We’ve issued v2 certs on ethereum-ropsten that import fine into multiple Android wallets and verify on the universal verifier at blockcerts.org/ but they won’t import into the iOS wallet (we’ve tried multiple iPhones). I… --- ## [No module named 'ethereum' for cert-issuer Python](https://community.blockcerts.org/t/no-module-named-ethereum-for-cert-issuer-python/2349)
**Author:** [@arycloud](https://community.blockcerts.org/u/arycloud)\ **Replies:** 2\ **Last updated:** [February 18, 2020, 3:09pm UTC](https://community.blockcerts.org/t/no-module-named-ethereum-for-cert-issuer-python/2349 "2020-02-18T15:09:56Z")
I’m just getting started with Blockcert-python and trying to run it on my local system. Here are the steps I did: Clone the cert-issuer GitHub repo Create a virtual environment for Python 3.5.4 on Mac OS Run python se… --- ## [Blockcert Ethereum Cost](https://community.blockcerts.org/t/blockcert-ethereum-cost/2812)
**Author:** [@nitinb](https://community.blockcerts.org/u/nitinb)\ **Replies:** 2\ **Last updated:** [April 29, 2021, 5:41pm UTC](https://community.blockcerts.org/t/blockcert-ethereum-cost/2812 "2021-04-29T17:41:57Z")
How can I find the fee for Issuing a transaction in Ethereum Network? I can even accommodate some delay ( Couple of Minutes) in order to get the cheapest rate. As Prices fluctuate daily, Please let me know the source H… --- ## [For s in signed\_hextx.split('80a0'): AttributeError: 'dict' object has no attribute 'split'](https://community.blockcerts.org/t/for-s-in-signed-hextx-split-80a0-attributeerror-dict-object-has-no-attribute-split/1838)
**Author:** [@johnwick](https://community.blockcerts.org/u/johnwick)\ **Replies:** 9\ **Last updated:** [May 28, 2021, 11:15am UTC](https://community.blockcerts.org/t/for-s-in-signed-hextx-split-80a0-attributeerror-dict-object-has-no-attribute-split/1838 "2021-05-28T11:15:07Z")
Hi, I am currently working on my college project where I am using blockcerts on ethereum\_ropsten network. After all the configuration, when I try to issue the cerificate it throws AttributeError: ‘dict’ object has no att… [Previous page](https://community.blockcerts.org/latest.md?page=4) [Next page](https://community.blockcerts.org/latest.md?page=6)