>And by pushing their preferred observed transaction to major pools, Square could help ensure a double-spend can't succeed, or get a near-instant indication tha

>And by pushing their preferred observed transaction to major pools, Square could help ensure a double-spend can't succeed, or get a near-instant indication that a competing transaction exists. What would this even look like? is anyone doing 'specialized mining' like this, where particular hashing nodes are being used for preferential transactions?