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That means you have to wait up to 10 minutes
to pay for your latte with bitcoin.
bitcoin is useless as a medium of exchange.
Lol, as if anyone would want to use bitcoin as a payment. Why the heck would I want to spend my bitcoins today if in a year a bitcoin is 10x higher in value? Bitcoin is a store of value. Digital gold or simply the best thing since sliced bread.
There are lots of different bitcoin mining computers out there, but many companies have focused on Application-Specific Integrated Circuit (ASIC) mining computers, which use less energy to conduct their calculations. Mining companies that run lots of ASIC miners as businesses claim to use only one watt of power for every gigahash per second of computing performed when mining for bitcoins.
If this information is correct, the bitcoin network in 2020 consumes 120 gigawatts (GW) per second. This converts to about 63 terawatt-hours (TWh) per year.
One Gighash Per Second = One Watt
One Terahash Per Second = One Kilowatt
One Petahash Per Second = One Megawatt
One Exahash Per Second = One Gigawatt
This staggering amount of power is the equivalent of 156 million horses (1.3 million horses per GW) or 49,440 wind turbines (412 turbines per GW) generating power at peak production per second.2
Regardless of the number of miners, it still takes 10 minutes to mine one Bitcoin. At 600 seconds (10 minutes), all else being equal it will take 72,000 GW (or 72 Terawatts) of power to mine a Bitcoin using the average power usage provided by ASIC miners.
One watt per gigahash per second is fairly efficient, so it's likely that this is a conservative estimate since a large number of residential miners use more power. Media outlets and bloggers have produced various estimates of the electrical energy used in bitcoin mining, so the accuracy of reported power use is sketchy, at best.
Bitcoin Can’t Compete With Credit Cards
Bitcoin isn’t ready to be a medium of exchange. Its biggest limitation is that it can’t compete with credit and debit cards to process transactions.
Bitcoin transactions must be approved by the entire network. And this network can only handle a measly seven transactions per second.
It’s a different planet from Visa, which can handle 25,000 to 50,000 transactions per second. That means you have to wait up to 10 minutes
to pay for your latte with bitcoin. And when the network is crowded, the transaction might not make it into the first block.
At the peak of bitcoin-mania in 2017, it took as long as several hours to buy or sell the digital currency.
Without lightning-fast approval time, bitcoin is useless as a medium of exchange.