Jul 01, · That’s why large Bitcoin mining farms have so many ASICs, to improve those odds. Given that a new block is produced every 10 minutes (equal to blocks per day) a mining farm with ten or twenty thousand miners stands a decent chance of winning a couple of blocks per 24 hour period. Mining farms are truly impressive to see firsthand. Apr 22, · 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 mining is a key part of the security of the Bitcoin system. The idea is that Bitcoin miners group a bunch of Bitcoin transactions into a block, then repeatedly perform a cryptographic operation called hashing zillions of times until someone finds a special extremely rare hash value.

# Bitcoin mining per hand

7 Reasons Bitcoin Mining is Profitable and Worth It ()I perform the first round of hashing to mine a block. Completing this round took me 16 minutes, 45 seconds. To explain what's on the paper: I've written each block A through H in hex on a separate row and put the binary value below. In the lower right, a bunch of terms are added together, corresponding to the first three red sum boxes. In the upper right, this sum is used to generate the new A value, and in the middle right, this sum is used to generate the new E value.

These steps all correspond to the diagram and discussion above. I also manually performed another hash round, the last round to finish hashing the Bitcoin block. In the image below, the hash result is highlighted in yellow.

The zeroes in this hash show that it is a successful hash. Note that the zeroes are at the end of the hash. The reason is that Bitcoin inconveniently reverses all the bytes generated by SHA Last pencil-and-paper round of SHA, showing a successfully-mined Bitcoin block. Each step of SHA is very easy to implement in digital logic—simple Boolean operations and bit addition. If you've studied electronics, you can probably visualize the circuits already. For this reaon, custom ASIC chips can implement the SHA algorithm very efficiently in hardware, putting hundreds of rounds on a chip in parallel.

Image from Zeptobars. CC BY 3. In contrast, Litecoin, Dogecoin, and similar altcoins use the scrypt hash algorithm, which is intentionally designed to be difficult to implement in hardware. It stores different hash values into memory, and then combines them in unpredictable ways to get the final result. As a result, much more circuitry and memory is required for scrypt than for SHA hashes. You can see the impact by looking at mining hardware , which is thousands of times slower for scrypt Litecoin, etc than for SHA Bitcoin.

The SHA algorithm is surprisingly simple, easy enough to do by hand. The elliptic curve algorithm for signing Bitcoin transactions would be very painful to do by hand since it has lots of multiplication of byte integers. Doing one round of SHA by hand took me 16 minutes, 45 seconds. At this rate, hashing a full Bitcoin block rounds [3] would take 1.

In comparison, current Bitcoin mining hardware does several terahashes per second, about a quintillion times faster than my manual hashing. Needless to say, manual Bitcoin mining is not at all practical.

A Reddit reader asked about my energy consumption. The next question is the energy cost. Thus my energy cost per hash is about 67 quadrillion times that of mining hardware. It's clear I'm not going to make my fortune off manual mining, and I haven't even included the cost of all the paper and pencils I'll need. To be precise, the hash must be less than a particular value that depends on the current Bitcoin difficulty level.

The NSA designed the SHA algorithm and picked the values for these constants, so how do you know they didn't pick special values that let them break the hash? To avoid suspicion, the initial hash values come from the square roots of the first 8 primes, and the K t values come from the cube roots of the first 64 primes. Since these constants come from a simple formula, you can trust that the NSA didn't do anything shady at least with the constants.

Thus, a second set of 64 SHA hash rounds is required on the second half of the Bitcoin block. Adding this up, hashing an arbitrary Bitcoin block takes rounds in total. However there is a shortcut. Mining involves hashing the same block over and over, just changing the nonce which appears in the second half of the block.

Thus, mining can reuse the result of hashing the first bits, and hashing a Bitcoin block typically only requires rounds. I started the hashing process with a block that had already been successfully mined. In particular I used the one displayed earlier in this article,. This post first appeared on Ken Shirriff's blog and is republished here with permission.

Ken Shirriff is a software engineer who blogs about chargers, old integrated circuits, and Bitcoin in his spare time. This was really informative, especially the videos. Some things not clear to me - what, if any, is the NSA's involvement with the bitcoin mining process other than providing the encryption method?

Will the mining eventually end as a result of finding all the bitcoins or as a result of the process costing more than it's worth?

What will take the place of bitcoins once they're all mined - can more be created? The A. Filed to: bitcoin. The software that mines bitcoin is designed so that it always will take 10 minutes for everyone on the network to solve the puzzle. It does that by scaling the difficulty of the puzzle depending on how many people are trying to solve it. As more people join the bitcoin network and try to mine bitcoins, the puzzles become harder, and more computing power and electricity are used for each bitcoin produced.

To understand how to calculate the electrical energy used to power the bitcoin network, you'll need to understand how bitcoin creation works. These individual sums are called hashes, and there are vast numbers of them—so many, in fact, that you have to think of them in terms of millions of hashes known as megahashes or billions of hashes gigahashes to make any sense of them.

In early , the computers on the bitcoin network were close to exahashes per second. One terahash is a trillion hashes per second, one petahash is a quadrillion hashes per second, and one exahash is one quintillion hashes per second a one followed by 18 zeros. 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.

If this information is correct, the bitcoin network in consumes gigawatts GW per second. This converts to about 63 terawatt-hours TWh per year. This staggering amount of power is the equivalent of million horses 1. Regardless of the number of miners, it still takes 10 minutes to mine one Bitcoin.

At seconds 10 minutes , all else being equal it will take 72, 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.

To perform a cost calculation to understand how much power it would take you to create a bitcoin, you'd first need to know electricity costs where you live and the amount of power you would consume. More efficient mining equipment means less power consumption, and less power consumption means lower power bills.

The lower the price of electricity, the less cost there is to miners—thus increasing the value of the Bitcoin to miners in lower-cost areas after accounting for all the costs associated with setup. Bitcoin's exchange rate has fluctuated wildly throughout its history—but as long as it's price stays above the cost to produce a coin, doing the work in an area where energy costs are very low is important to make the practice worthwhile.

The price placed on bitcoin in terms of energy consumption, and thus environmental impact, depends on how useful it's going to be to society. This then begs the question—if bitcoin continues to rise in popularity and price, how much more power will be consumed, and will it ultimately be worth the environmental cost? Guide to Bitcoin. By Full Bio Follow Linkedin.

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