After reading stuff about BCX, I was curious how will the Grain blockchain deal with blocks that have a faked timestamp, so I have run a test.
I have changed the system clock time on my miner 2 hours into the future and started mining.

The network has accepted my blocks and I have also solved PoS blocks with a faked timestamp. I have tested this a second time without a PoS block being solved and the network has rejected my PoW blocks.
Normally I get 66-75% stales/invalids, but with the faked timestamp I have got only 40-50%. The PoW difficulty was also lowering!

After restoring the normal time I could still mine with a low difficulty for a short time, but then the difficutly has raised without PoW blocks being solved.
The difficulty was so high, that I could not solve any (or almost none, I cant remember) PoW blocks until 2 hours since my last block with a fake timestamp have passed.
My client also didnt solve any PoS blocks.

I cant tell how exacly the network did behave during this 2 hours, because I had only one client running, but I have noticed a very big interval between the blocks.
I can remember that the highest interval between block (according to my client) was over 10 minutes (maybe even 20).

After the 2 hours, my client have solved a shitload of PoS blocks instantly and the difficulty was back to normal.

I could made a copy of the chain and do the above and mine faster than the network.
I could also play with the timestamps on my private copy of the chain and I would definitely solve the blocks faster than PoW and PoS of the network combined.


It is also a bad idea of swisscex to accept Grain deposits after only 6 confirmations.