hi. i’m struggling with this piece of text
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# Verification Process
This library and the python [cert-verifier](https://github.com/blockchain-certificates/cert-verifier) library verify Blockchain Certificates. However, anyone should be able to verify independently, whether manually or by writing their own library or service. These steps walk you through the certificate verification steps.
### Blockchain Certificate
The Blockchain Certificate contains:
- the content to be verified
- the location of additional inputs needed for verification (described in next inputs)
### Blockchain Transaction
A Blockchain Certificate must have a `certificate.signature.anchors` field, which must contain at least one anchor to a blockchain transaction.
The `anchors` entry below says that the transaction was performed on the Bitcoin blockchain, and the field needed to verify integrity of the certificate is `OP_RETURN` (because `type` is `BTCOpReturn`). This also says the transaction id is `8623beadbc7877a9e20fb7f83eda6c1a1fc350171f0714ff6c6c4054018eb54d` (via the `sourceId`) field.
especially part about " Check certificate authenticity"
particularly “the key had not expired or been revoked when the transaction occurred.”
what does it mean? which key was not expired or revoked?
Am I wrong that key is private key from issuers bitcoin address? if so, how can it be expired or revoked.
If not, what key is meant here?
if its not private key from bitcoin address, then what kind of key is it and where is it published and where its expiration and revokation details are published?
i’m totally puzzled with this piece of information and will highly appreciate any help or clarification.
Thanks in advance