No, he can't. TheFirst of all, he cosigned each transaction with a different address, but they're from the same list for the same output, so the address that is highest on that list is valid. Secondly, the minority of honest nodes, even if it's just one, will havewould respond to any query with the valid copies of both transactions provingtransaction, while the double spend. And any nodes that don't report both transactionsrespond with the invalid transaction, no matter how many there are obviously participating in a Sybil attack and, would beget added to a block list for misbehaving.

On the other hand, this is extremely disconcerting.

No, he can't. The minority of honest nodes, even if it's just one, will have valid copies of both transactions proving the double spend. And any nodes that don't report both transactions are obviously participating in a Sybil attack and would be added to a block list for misbehaving.

No, he can't. The minority of honest nodes, even if it's just one, will have valid copies of both transactions proving the double spend. And any nodes that don't report both transactions are obviously participating in a Sybil attack and would be added to a block list.