competingTxids property
The competing transactions ARC named (competingTxs) when it reported
DOUBLE_SPEND_ATTEMPTED for this payment (bead libspiffy-pkum): every
txid reported so far, in the order first reported. Kept when a later
status names none and after the payment resolves; empty when ARC named
none, or for a status journaled before they were recorded.
Implementation
final List<String> competingTxids;