It is also a bad idea of swisscex to accept Grain deposits after only 6 confirmations.
Missed this initially. It's their business and their risks. If they see it affordable then let it be.
I can send you my wallet with all Tx, if it helps you to analyze with issue.
I just wonder, if it works for 2h, would it also work for a day or a week or a month?
The main problem behind Grain is that there is no hash power behind it.
There is no need to send your wallet.
Works what? No PoW blocks for 2 hours? Or something else? If the former one, I already explained you: there were no miners active during that time. According to my observations we have only two or three people PoW mining it. And they do not mine it 24h a day. I have only 1 CPU miner running to collect the blocks when there is no power at all - just to give an opportunity to other people to mine.
With "works" in mean that the blockchain accepts blocks with future timestamps.