Digital certificates (also known as X509 public-key certificates) are used to prove the identity of a client or of a server to the communicating partner and to establish an encrypted channel for secure communication. The most prominent use of digital certificates is found in the HTTPS protocol, for securing websites and clients by means of digital signatures and public-key encryption. Because digital certificates are signed by Certificate Authorities that supposedly everyone trusts, it is implicitly said that these certificates provide some degree of trustworthiness. But history shows us that Certificate Authorities can also make mistakes, issue false certificates or be compromised in some form or another. Also, currently there are multiple types of digital certificates that can be issued: DV, OV and EV, which cost differently based on the grade of trust. We believe that real trust should not be quantifiable in degrees of trust: we either trust a certificate or we don’t. We propose BlockCACert, a blockchain-based solution for CAs for issuing all types of X509 certificates using the ring signatures concept, which fixes the problem of general trust and multiple-level trust by using a global procedure for issuing all types of digital public-key certificates.