With a certificate-based digital signature, every signer is issued a digital ID  within the sort of a certificate from a trust service provider (TSP), like a certificate authority (CA). When signing a document, the signer’s identity is re-validated and therefore the signature is cryptographically sure to the document using public key infrastructure (PKI) technology. This makes digital signatures, like cloud signatures, ideal for higher-risk transactions or once you got to suits regulations like eIDAS within the European Union.