guys, is there a mean to see the weight of coins when a block is forged ? (or calculating it with the difficulty ?)
Sure:
Find that tx in the transaction list
Right click
Select copy txid
Go to the debug console
Type "getstaketx ", then paste that txid you just copied, enter
Multiply the "Days to Stake" value minus 8.8 by the "Original Amount" value
That's the weight it had when it staked