Кажется, что-то странное происходит с сервером ключей. Раньше это работало надежно, но только сейчас мне пришлось 5 раз пытаться получить ключ.
$ ls -a
. ..
$ mkdir gpg
$ gpg --homedir gpg --keyserver pgp.key-server.io --search 4911A8DFE976ACDFA07130DBE8372C0C1C734C51
gpg: WARNING: unsafe permissions on homedir '/private/var/folders/fr/hnsktbhj611cbgfj6thp_jcr0000gn/T/tmp.HN9B7i113l/gpg'
gpg: keybox '/private/var/folders/fr/hnsktbhj611cbgfj6thp_jcr0000gn/T/tmp.HN9B7i113l/gpg/pubring.kbx' created
gpg: data source: http://pgp.key-server.io:11371
gpg: key "4911A8DFE976ACDFA07130DBE8372C0C1C734C51" not found on keyserver
gpg: keyserver search failed: Not found
$ gpg --homedir gpg --keyserver pgp.key-server.io --search 4911A8DFE976ACDFA07130DBE8372C0C1C734C51
gpg: WARNING: unsafe permissions on homedir '/private/var/folders/fr/hnsktbhj611cbgfj6thp_jcr0000gn/T/tmp.HN9B7i113l/gpg'
gpg: data source: http://pgp.key-server.io:11371
gpg: key "4911A8DFE976ACDFA07130DBE8372C0C1C734C51" not found on keyserver
gpg: keyserver search failed: Not found
$ gpg --homedir gpg --keyserver pgp.key-server.io --search 4911A8DFE976ACDFA07130DBE8372C0C1C734C51
gpg: WARNING: unsafe permissions on homedir '/private/var/folders/fr/hnsktbhj611cbgfj6thp_jcr0000gn/T/tmp.HN9B7i113l/gpg'
gpg: data source: http://pgp.key-server.io:11371
gpg: key "4911A8DFE976ACDFA07130DBE8372C0C1C734C51" not found on keyserver
gpg: keyserver search failed: Not found
$ gpg --homedir gpg --keyserver pgp.key-server.io --search 4911A8DFE976ACDFA07130DBE8372C0C1C734C51
gpg: WARNING: unsafe permissions on homedir '/private/var/folders/fr/hnsktbhj611cbgfj6thp_jcr0000gn/T/tmp.HN9B7i113l/gpg'
gpg: data source: http://pgp.key-server.io:11371
gpg: key "4911A8DFE976ACDFA07130DBE8372C0C1C734C51" not found on keyserver
gpg: keyserver search failed: Not found
$ gpg --homedir gpg --keyserver pgp.key-server.io --search 4911A8DFE976ACDFA07130DBE8372C0C1C734C51
gpg: WARNING: unsafe permissions on homedir '/private/var/folders/fr/hnsktbhj611cbgfj6thp_jcr0000gn/T/tmp.HN9B7i113l/gpg'
gpg: data source: http://pgp.key-server.io:11371
(1) Digital Asset Holdings, LLC <security@digitalasset.com>
2048 bit RSA key E8372C0C1C734C51, created: 2019-05-16, expires: 2021-05-15
Keys 1-1 of 1 for "4911A8DFE976ACDFA07130DBE8372C0C1C734C51". Enter number(s), N)ext, or Q)uit > 1
gpg: /private/var/folders/fr/hnsktbhj611cbgfj6thp_jcr0000gn/T/tmp.HN9B7i113l/gpg/trustdb.gpg: trustdb created
gpg: key E8372C0C1C734C51: public key "Digital Asset Holdings, LLC <security@digitalasset.com>" imported
gpg: Total number processed: 1
gpg: imported: 1
$
(используя пустой homedir, чтобы гарантировать отсутствие помех от существующей конфигурации)
Я быпредлагаем просто повторить попытку.