To save anyone the trouble, here’s a key I’ve generated just now:
-----BEGIN OPENSSH PRIVATE KEY-----
b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
QyNTUxOQAAACAqTGrNcWWZrKjDzAgG1KaCYAOOAoqSSQvvWVgUx7PdMgAAAJgzuRsTM7kb
EwAAAAtzc2gtZWQyNTUxOQAAACAqTGrNcWWZrKjDzAgG1KaCYAOOAoqSSQvvWVgUx7PdMg
AAAEC8jODzrMngnvJlMwtlhqwlI6qS42WlzSDADbEYaCsRzCpMas1xZZmsqMPMCAbUpoJg
A44CipJJC+9ZWBTHs90yAAAAEXUwX2E0MzhAbG9jYWxob3N0AQIDBA==
-----END OPENSSH PRIVATE KEY-----
(and if I did it wrong enough, well, you can hack me but please let me know how I fucked up)
Change any random character in there to see how the website reacts to a unique key. I changed an O to an o and it accepted it.
I desperately want to know if this is: