Mempool monitoring is not nearly robust enough. Only block builders themselves can provide these kinds of guarantees. If they’re rational (in the short term at least) and the cancel tx was paying them, the solution would have to outbid the cancel.
Mempool monitoring is not nearly robust enough. Only block builders themselves can provide these kinds of guarantees. If they’re rational (in the short term at least) and the cancel tx was paying them, the solution would have to outbid the cancel.