Verifiable Credentials are trustworthy
The data in a Verifiable Credential (VC) is trustworthy because it is protected with cryptographic security.
The data in a Verifiable Credential (VC) is digitally signed by the Issuer who creates the VC using its Private Key. The resulting Signature and the Issuer’s Public Key are also part of the VC. This Signature and Public Key enables a verifier to mathematically calculate and conclude that the data is authentic.
If any of the data was changed, the Signature would no longer be correct and the data can no longer be trusted.
Through te use of Decentralized Identifiers (DID) and because an Issuer publishes their Public Key, it is transparent who was the Issuer of the Verifiable Credential (VC).