Add safegards if UnitBase or UD value change
If a node lies about current amount base or UD value, the sent amount could be wrong.
Waiting for GVA and it’s validation check, those values could be checked on two nodes, or checked into a range of value.
It should be done at least on Ğ1 currency:
10.07 ≤ UDValue < 10.5/11: should be safe for one year at least
1 == base: should be safe for many years
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