To find a public key by its fingerprint, your contact must have given you their key's fingerprint, made up of 40 hexadecimal characters.
To find a public key by email, its owner must have allowed their key to be searched by email address.
To verify an ARISTHOR signature, use our public key, which you can find by entering this fingerprint [ b540b9742249d5465e0c437e7f604e617b3e8c5d ] (without the brackets) in the search field above, or by getting it directly here Aristhor's public key