Verifiable Credential and Presentation Transmission Protocol (1):
This defines the methods of how the 3 above roles interact with each other. The 3 actors are the holder, the issuer, and the verifier. The issuer can issue a verifiable credential to the holder at their request.
可验证凭证和演示传输协议（1）：
这定义了上述3个角色如何相互交互的方法。这三个参与者是持有人、发行人和验证者。发卡机构可以应持有人的请求向其颁发可验证凭证。