type `AssetDenomination`

`common.AssetDenomination`

Field	Type	Description
denominations	int64 `repeated`	Denominations allowed, e.g. [1, 5, 10, 25, 100, etc.].
precision	uint32	Precision for Asset (decimals places), e.g. USD $1.00 = 2.

{
  "denominations": [
    1,
    5,
    10,
    25,
    100,
    200,
    500,
    1000
  ],
  "precision": 2
}