for one thing it seems unlikely they would have mined minikeys for a vanity address...is there even vanity software that comes stock with that functionality?
Well, just because there is no off-the-shelf software to do something, doesn't mean its not doable:
SUPER1FLAMEN6QPEGRLTFZXDEAFFAL -> 1FLANSqJppAGxWdCrUW2VsrncH1NfWtNXo
SUPER1FLAMEN6JQWSXAAHLJQJDEZXR -> 1FLArjwv7oPTZGUuGxLhEtPh7pkfoSbRTX
SUPER1FLAMEN6RHJSDXWSCEFMSBMWX -> 1FLA4LzZtRuaV914mEJHaWmBGdaMt2AmRG
These are all valid mini-private keys that I vanitized in 2 minutes, on GPU it would be much faster...
They are:
- 30 chars long
- follow base58 charset
- follow code128b charset