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5 changes: 3 additions & 2 deletions hathor/verification/transaction_verifier.py
Original file line number Diff line number Diff line change
Expand Up @@ -387,8 +387,9 @@ def verify_conflict(self, tx: Transaction, params: VerificationParams) -> None:
# Skip tx itself.
continue
conflict_tx = tx.storage.get_transaction(h)
if conflict_tx.get_metadata().first_block is not None:
# only mempool conflicts are allowed
conflict_meta = conflict_tx.get_metadata()
if conflict_meta.first_block is not None and not conflict_meta.voided_by:
# only mempool conflicts are allowed or failed nano executions
raise ConflictWithConfirmedTxError('transaction has a conflict with a confirmed transaction')
if within_counter == 0:
# Only increment once per input.
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