Sure, since miners (swimming pools) assemble the blocks they mine, they will insert any legitimate transactions they need, together with transactions that have been by no means broadcasted to the broader community. They do not even want 51% of the worldwide hashrate, they simply must create blocks usually sufficient that they do not have to attend too lengthy for his or her transactions to verify.
Some mining swimming pools generally do that. For instance, right here is an instance transaction mined by F2Pool that most certainly distributes mining rewards to the pool’s miners. It pays no charge which implies it was by no means broadcasted, since zero-fee transactions aren’t propagated by nodes by way of the community.
