All that is indicated by that guide is inside the cert-issuer container, there is an example of how to create a certificate as a test without using bitcoin or ethereum.
But if you want to create real certificates you just have to modify the conf.ini file, replacing the test url by a url with balance (bitcoin or ethereum). My problem is that I don’t know where to buy low-cost virtual coins, so I’m going to invest a maximum of 50 euros, because in most pages to buy bitcoins you are asked to invest a minimum of 200 euros. I have used coinbase to buy bitcoins because it allowed me to buy 40 euros in bitcoin but it only gives me public addresses and I don’t have the private address, both addresses are useful to create certificates.
ready with this you can create certificates in test mode, or by changing the addresses for ones with balance (bitcoin or ethereum) you can issue real certificates.
I’m at this point because I do not know where to buy bitcoin for a maximum of 40 euros, as I see on the Internet that to buy virtual coins are asked for at least 200 euros and that’s a lot of money for me, to perform some tests. I have used coinbase and his wallet but it does not provide the private key only allows you to buy and sell but everything with public key because they are the ones who make the transfer. If you know a website where you can buy bitcoin for 40 euros and they give you the public and private key, pass me the data.