Hey guys,
I have the same blockchain that is passed block 426490, but I think whatever coins generated after block 426490 are not accepted by exchanges like cryptsy. They are probably "stuck" on blockchain with block "426490".
The "working" blockchain I could find is here:
https://altexplorer.net/chain/Argentum and it is also on a latest block of 426490.
Now, I wounder if blockchain passed 426490 is legit.
Cryptsy probably hasn't patched their wallet yet, so they can't get the new blocks. Once they patch they should sync to the current longest chain and the new transactions should come in.