pgpKeyId

The cryptographic fingerprint of the key used to generate the signature, as output by, e.g. gpg --list-keys. This should be the version 4, full 160-bit fingerprint, expressed as a 40 character hexadecimal string. See https://tools.ietf.org/html/rfc4880#section-12.2 for details. Implementations may choose to acknowledge "LONG", "SHORT", or other abbreviated key IDs, but only the full fingerprint is guaranteed to work. In gpg, the full fingerprint can be retrieved from the fpr field returned when calling --list-keys with --with-colons. For example: `` gpg --with-colons --with-fingerprint --force-v4-certs \ --list-keys attester@example.com tru::1:1513631572:0:3:1:5 pub:...... fpr:::::::::24FF6481B76AC91E66A00AC657A93A81EF3AE6FB: `` Above, the fingerprint is 24FF6481B76AC91E66A00AC657A93A81EF3AE6FB.