うんうん。notationとかの自己署名証明書が削られてる
$ gpg --export --export-options export-clean F60960D80B224382CA8D831CB56C20316D6E8279 | gpg --list-packets
# off=0 ctb=99 tag=6 hlen=3 plen=397
:public key packet:
version 4, algo 1, created 1592976417, expires 0
pkey[0]: [3072 bits]
pkey[1]: [17 bits]
keyid: B56C20316D6E8279
# off=400 ctb=b4 tag=13 hlen=2 plen=24
:user ID packet: "zunda <zundan@gmail.com>"
# off=426 ctb=89 tag=2 hlen=3 plen=532
:signature packet: algo 1, keyid B56C20316D6E8279
version 4, created 1615012817, md5len 0, sigclass 0x13
digest algo 10, begin of digest 3c 74
hashed subpkt 27 len 1 (key flags: 03)
hashed subpkt 9 len 4 (key expires after 2y0d0h0m)
hashed subpkt 11 len 4 (pref-sym-algos: 9 8 7 2)
hashed subpkt 21 len 5 (pref-hash-algos: 10 9 8 11 2)
hashed subpkt 22 len 3 (pref-zip-algos: 2 3 1)
hashed subpkt 30 len 1 (features: 01)
hashed subpkt 23 len 1 (keyserver preferences: 80)
hashed subpkt 33 len 21 (issuer fpr v4 F60960D80B224382CA8D831CB56C20316D6E8279)
: