Get the amount for the change output after paying needed fees.
Declared in <wallet/coinselection.h>
CAmount
GetChange(
CAmount min_viable_change,
CAmount change_fee) const;The change amount is not 100% precise due to discrepancies in fee calculation. The final change amount (if any) should be corrected after calculating the final tx fees. When there is a discrepancy, most of the time the final change would be slightly bigger than estimated.
Following are the possible factors of discrepancy: + non-input fees always include segwit flags + input fee estimation always include segwit stack size + input fees are rounded individually and not collectively, which leads to small rounding errors
input counter size is always assumed to be 1vbyte
Amount for change output, 0 when there is no change.
| Name | Description |
|---|---|
| min_viable_change [in] | Minimum amount for change output, if change would be less then we forgo change |
| change_fee [in] | Fees to include change output in the tx |