Cert-issuer fails when using the example verifiable-credential.json about cert-issuer

[lemoustachiste]

hmm, I think it could be related to the fact that you are using the examples context: https://www.w3.org/2018/credentials/examples/v1 and that it's not "preloaded" to jsonld. To make sure, try to remove this context from the list, you should get a different error on alumniOf.

If that's the case, and you really want to use the examples context, there 2 ways you can preload the context.

Either in conf.ini:

context_urls=[https://www.w3.org/2018/credentials/examples/v1]
context_file_paths=[your-path-to-the-local-context-file]

Tip: you can do something like curl -L https://www.w3.org/2018/credentials/examples/v1 >> your-path-to-the-local-context-file to quickly store the file locally.

Or with the CLI:

python -m cert_issuer -c conf.ini --context_urls https://www.w3.org/2018/credentials/examples/v1 --context_file_paths your-path-to-the-local-context-file

[pranayperiwal]

Hi! Thank you for your quick reply.
If I remove the line https://www.w3.org/2018/credentials/examples/v1 from verifiable-credential.json, I get this response:

bash-5.0# cert-issuer -c /etc/cert-issuer/conf.ini
WARNING - Your app is configured to skip the wifi check when the USB is plugged in. Read the documentation to ensure this is what you want, since this is less secure
INFO - This run will try to issue on the bitcoin_regtest chain
INFO - Set cost constants to recommended_tx_fee=0.000600,min_per_output=0.000028,satoshi_per_byte=250
INFO - Processing 1 certificates
INFO - Processing 1 certificates under work path=/etc/cert-issuer/work
INFO - Total cost will be 133500 satoshis
INFO - Starting finalizable signer
WARNING - app is configured to skip the wifi check when the USB is plugged in. Read the documentation to ensure this is what you want, since this is less secure
INFO - Stopping finalizable signer
WARNING - app is configured to skip the wifi check when the USB is plugged in. Read the documentation to ensure this is what you want, since this is less secure
INFO - here is the op_return_code data: f4906de7db4f9a826b5998472f51eaac762d429b29b6c2496f38870a477929d9
INFO - Unsigned hextx=0100000001556154cba262e3795d9925b9c83bd1bbefc4a0c59f617c1efbd262b8f5032dff0100000000ffffffff02a07acc1d0000000016001425e2b1a1d9f2496c0d04c7c19592dc4214c9e5c40000000000000000226a20f4906de7db4f9a826b5998472f51eaac762d429b29b6c2496f38870a477929d900000000
INFO - Preparing tx for signing
INFO - Starting finalizable signer
WARNING - app is configured to skip the wifi check when the USB is plugged in. Read the documentation to ensure this is what you want, since this is less secure
ERROR - Unable to sign transaction. hextx=01000000000101556154cba262e3795d9925b9c83bd1bbefc4a0c59f617c1efbd262b8f5032dff0100000000ffffffff02a07acc1d0000000016001425e2b1a1d9f2496c0d04c7c19592dc4214c9e5c40000000000000000226a20f4906de7db4f9a826b5998472f51eaac762d429b29b6c2496f38870a477929d902473044022028e084bbf275b27f7d796a299ce53ee4e0af94c71fbbc70fe49d7f53d00a2aff022006e9a873c64d3685d7131704fc119f22e6303ec574783607dfa2e1027670500b0121026f62fd7d68fa3ac1add38c9b30b033af1c5b7de2522742ede2cbd3a51433ac7000000000
INFO - Stopping finalizable signer
WARNING - app is configured to skip the wifi check when the USB is plugged in. Read the documentation to ensure this is what you want, since this is less secure
Traceback (most recent call last):
  File "/usr/bin/cert-issuer", line 8, in <module>
    sys.exit(cert_issuer_main())
  File "/usr/lib/python3.8/site-packages/cert_issuer/__main__.py", line 17, in cert_issuer_main
    issue_certificates.main(parsed_config)
  File "/usr/lib/python3.8/site-packages/cert_issuer/issue_certificates.py", line 34, in main
    return issue(app_config, certificate_batch_handler, transaction_handler)
  File "/usr/lib/python3.8/site-packages/cert_issuer/issue_certificates.py", line 20, in issue
    tx_id = issuer.issue(app_config.chain)
  File "/usr/lib/python3.8/site-packages/cert_issuer/issuer.py", line 27, in issue
    txid = self.transaction_handler.issue_transaction(blockchain_bytes)
  File "/usr/lib/python3.8/site-packages/cert_issuer/blockchain_handlers/bitcoin/transaction_handlers.py", line 56, in issue_transaction
    signed_tx = self.sign_transaction(prepared_tx)
  File "/usr/lib/python3.8/site-packages/cert_issuer/blockchain_handlers/bitcoin/transaction_handlers.py", line 92, in sign_transaction
    signed_tx = signer.sign_transaction(prepared_tx)
  File "/usr/lib/python3.8/site-packages/cert_issuer/models/__init__.py", line 99, in sign_transaction
    return self.signer.sign_transaction(self.wif, transaction_to_sign)
  File "/usr/lib/python3.8/site-packages/cert_issuer/blockchain_handlers/bitcoin/signer.py", line 35, in sign_transaction
    raise UnableToSignTxError('Unable to sign transaction')
cert_issuer.errors.UnableToSignTxError: Unable to sign transaction

If I don't remove the line from the file, I get the same error even after downloading the context file and adding the lines you mentioned in conf.ini

[lemoustachiste]

You should look at the reason why the Error is raised from there:

 File "/usr/lib/python3.8/site-packages/cert_issuer/blockchain_handlers/bitcoin/signer.py", line 35, in sign_transaction
    raise UnableToSignTxError('Unable to sign transaction')

Reasons could be different, but the low hanging one could be: is your wallet funded?

[pranayperiwal]

I have tried to debug it but not sure what else can I do. There is enough balance in the wallet yup. I am not sure if there is a problem with the docker container or if there is some issue with the default files given. Apologies, I am new to blockchain so any advice would be helpful. Also if you would like, all I did was follow the steps in the Readme of cert-issuer while choosing 'sample unsigned certificate' for the issuing certificate,

[lemoustachiste]

is your private key correctly defined in pk_issuer.txt?
It should be in the WIF format: https://github.com/blockchain-certificates/did-generator/blob/master/key-management/generateKeyPair.ts#L75

[owenwu811]

you @context property needs to be an object, not an array:

{
"@context": {
"@Version": 1.1,
"schema": "http://schema.org/",
"cred": "https://www.w3.org/2018/credentials#",
"Blockcerts": "https://w3id.org/blockcerts#"
},
"id": "urn:uuid:bbba8553-8ec1-445f-82c9-a57251dd731c",
"type": ["VerifiableCredential", "BlockcertsCredential"],
"issuer": "did:example:23adb1f712ebc6f1c276eba4dfa",
"issuanceDate": "2022-01-01T19:33:24Z",
"credentialSubject": {
"id": "did:example:ebfeb1f712ebc6f1c276e12ec21",
"alumniOf": {
"id": "did:example:c276e12ec21ebfeb1f712ebc6f1"
}
}
}