Why do GPU-minable coins need longer confirmation waits for security?

With GPU-minable cryptocurrencies, it is significantly cheaper to rent enough computing power to control the network for one minute than to sustain that level of power for an hour. Commodity graphics cards are widely available for short-term rental on cloud markets, which means an attacker can briefly overpower a fast-confirming coin at low cost — reversing a transaction before the network catches on. This is the reason some chains require users to wait 10 to 60 minutes for high-value transactions: the long window makes a short-burst attack economically pointless. For Kaspa users, this trade-off explains why confirmation security is not just about raw speed — it is about making attacks too expensive to attempt.