As far as cryptsy's mintcoin wallet being in maintenance. it is not an issue with the blockchain but rather an internal issue that effected a few users.
We discovered a bug in security protocol that would see some transactions as unauthorized withdrawals and debit a users account for the amount of the transaction. To prevent any others users from being effected I have taken the wallet offline until the issue can be fixed. This was present in a few coins Saturncoin, Bluecon and Mintcoin.
I am hoping to have the wallet back up within 48 hours. We apologize for the delay it has caused
Out of curiosity can you share this error? Or point me in the correct direction. So many coins are descendants of MINT.
I interpreted an "internal issue" with a "bug in security protocol" as a Cryptsy specific protocol issue. However, I'm now seeing this isn't completely clear one way or the other. Perhaps Cryptsy can comment further?