Bitcoin
Get paper keys with Bitcoin Qt

I found an old paper private key, tried to import it, and got the following message: This command only supports legacy wallets (code -4).
Also, do you have a 0 and a capital O in your keys?
I found an old paper private key, tried to import it, and got the following message: This command only supports legacy wallets (code -4).
Also, do you have a 0 and a capital O in your keys?