In non-digital environments, protocol requires an ambassador to present a letter of credence upon becoming officially employed in ambassadorial activities in a particular territory. The letter itself is from the respective head of state to the host head of state.
In the digital sphere, diplomatic accreditation usually refers to an ambassador-at-large rather than an ambassador-in-residence, at least technically. Yet every ambassador requires somewhere to reside, even temporarily.
Credentials are often considered important in the 21st century. In digital diplomacy, a head of state gives an Internet Protocol address to the global diplomatic corps. This is presented as a way to link the digital certification of credibility to the World Wide Web of digital international relations.
The digital certification of credibility is usually difficult for anyone to verify. A reputation in the digital world means little at all in terms of integrity. The source code is all important.