ional, default=not set, detect change automatically) The 0-based index of the change output on the original transaction. The indicated output will be recycled into the new change output on the bumped transaction. The remainder after paying the recipients and fees will be sent to the output script of the original change output. The change outputâ€™s amount can increase if bumping the transaction adds new inputs, otherwise it will decrease. Cannot be used in combination with the 'outputs' option.

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