Convenience flag: true when status is 'fulfilled'.
error?
unknown
The error that occurred, present when status is 'rejected'.
groupIndices
number[]
The indices of the original groups this transaction carried, in order — the bridge back from a per-transaction result to the per-group input you submitted. For example groupIndices: [6, 7] means this transaction packed groups[6] and groups[7], so both share this transaction's status/signature/error. When every group is a single instruction, groupIndices[k] corresponds to instructions[k].