Name of attack where you pay a high fee to block others Is there a name for an attack where someone with a lot of capital makes loads of transactions with a high fee, just to prevent other transactions from taking place?
This seems like a moderately cheap way of preventing 99% of all transactions. Is this a real vulnerability, and if so what is its name?
It's a flood attack. Or just specifically &quot;transaction spamming&quot;.
It's rather theoretical vulnerability, blockspace market is open to everyone  and proceeding with this attack is a waste of money. It's not vulnerability in terms of being malicious and preventing parties from sending transactions with higher fees/ rbf.