Yoroi has a feature to export a wallet as a “key” (Options=>Wallet=>Export Wallet=>Export). I guess that it is the public root key, since the description says:
The below you can find your wallet's public key information. Public keys allow seeing the wallet history for the wallet, but does not allow to spend or move the funds in any way (private key is not included)
For testing purposes I created a test wallet and this is the "key" that Yoroi gives me:
So my question is: How is this key encoded? It does not have any default prefix and seems to be quite long.
PS: This question is part of a bigger question, which I split up into sub-questions, as recommended in the original question.