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How do they open channels for free ?
by mining them
Electricity is free?
no but miners don't pay mining fees
They do. Everybody does. Miner A pays to the miner B who wins the mining race for the block with A's transaction.
Sometimes, it might happen that a miner mines a block with its own transactions. But that's nothing you can rely on.
But that's nothing you can rely on.
You can. You just don't broadcast the transaction. So the transaction will only be included in a block when you mined a block. Then you can do it for free. You just need patience.
There's still an opportunity cost of replacing that free TX
Ya this is what i couldnt quite put my finger on, ty. It isnt free.
Ah, I see, you're right.
I only thought about mining fees when talking about "free transactions".
Plus some of the larger pools reliably mine many blocks per day. Definitely doable from that perspective
Self-mined transactions are generally not free. The space could have been used for other, paying, transactions.
Ooh. Nice way of putting it.
They can open channels for free. Only tiny advantage I can imagine