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QuarkCoin Cryptocurrency

Quark is a decentralized digital monetary system. It facilitates sending Quarks to Friends, Family Members Online Payments free of charges and charge-backs. Military Grade Encryption. No Bank or Government Control. Quark coins are based on the original idea of Bitcoin but improved, more secure, faster transaction times and zero fees. With improvements to design and security. There is also a greater coin supply with higher block rewards for miners. Quark is fully Open Source.

An In-Depth Guide to: How do I Fix my Ledger Nano’s Stuck Ethereum Transaction?!?!?! (It’s Been Stuck for Weeks and NOTHING Traditional has Worked!!!!) As Well as: How Do I Choose My Nonce??? I’ve Tried MetaMask, MEW/MyEtherWallet, and Others, but Nothing is Working Correctly!!! I’m Dying by Stress!

So, if you were like me 1-2 months ago, you’ve probably already gone through 2,or 3, ...or 40 articles and guides that probably say something like:
“YeP, eVeRy EtHeReUm UsEr WiLl EvEnTuAlLy HaVe ThE LoW-gAs ExPeRiEnCe, YoU’rE nOt AlOnE! DoN’t FrEaK OuT tHoUgH; ThErE iS a WaY tO fIx It!”
Chances are, every time you read another useless article, you want to kill the nearest inanimate object, even though it was never alive in the first place. Nonetheless, you’re gonna kill it as much as it can be killed, holding nothing back; or, you’re just plotting to and slowly getting closer to executing the plan (and the object) every time you are insulted once again.
However, if you have the ability to download software (MyCryptoWallet) on a PC, it should be safe to relax now. I think you’ve finally found some good news, because I am 99.99...% sure this will work for the issue that so many people are having at this time, around the end of the month of May, year 2020.
More and more people are likely to be having this issue soon, since Ethereum's gas prices have been insanely high lately as well as having 300% price changes in a matter of minutes; Etherscan’s Gas tracker is nearly uselessly-inaccurate at this time. I've heard that there's a congestion attack; that was said a week ago, and it appears to be ongoing... (I can't think of any other suspect besides Justin Sun to blame it on... it must be incredibly expensive to overload the blockchain for this long... I may be wrong though...)
Let’s begin
For myself, I was trying to send an ERC20 token when this dreadful issue attacked. Specifically, the token was either BSOV or GRT; I sent them 1 after the other and the first succeeded, and the second one took over a week.
(They’re both great tokens in my opinion and deserve much more attention than they’ve been getting. BSOV is nearing its 1 year anniversary as I write this, and GRT is still in its 90 day community-development progress test, so of course I'm gonna take this opportunity to "shill" them; they are great tokens with great communities).
I was able to finally fix it, after a week of mental agony (also the txn finally processed 1-2 hours before I found the solution, robbing me of the gratitude of fixing it myself... (╯‵□′)╯︵┻━┻ ...but now I guess I can hopefully save some of you the headaches that I endured... ) I’m providing the ability to do the same, in a step by step guide.
Why did I go through all of this trouble? I'd fault the fact that I have ADHD and autism, which in my case can multiply each other’s intensity and cause me to “hyper-focus” on things, much much more than most with the same qualities, intentionally or not. Adderall is supposed to give me a bit of control over it, but except for in a very-generalized way, it’s still 90% up to chance and my default-capabilities to allow me control over my attention with self-willpower. But also Karma and Moons pls... ʘ‿ʘ
  1. In MyCrypto, (I'm using the Windows 10 app, version 1.7.10) you will open to a screen that says "How would you like to access your wallet?". Choose Ledger, of course. (Unless your here for some non-ledger issue? Idk why you would be but ok.)
  2. On the next screen (having your nano already plugged in, unlocked, and opened into the Ethereum app) click "Connect to Ledger Wallet"
  3. A screen overlay should appear, titled: "Select an Address". Here is where it may get confusing for some users. Refer to "AAA" below to know how to find your account. (Geez, sorry lol that was a huge amount of info for a reddit reply; I might've over-elaborated a little bit too much. but hey it's valuable information nonetheless!)
  4. After escaping the "AAA" section, you'll have accessed your account with MyCrypto. Awesome! To find your ERC20 tokens, (slight evil-laughter is heard from an unidentifiable origin somewhere in the back of your mind) go to "AAB".
  5. (You may have decided to find the token(s) on your own, rather than daring to submit to my help again; if so, you may pity those who chose the other path... ~~( ̄▽ ̄)~~) Now, once you've added your token, you should revert your attention to the account's transfer fill-out form!
  6. I'll combine the steps you probably understood on your own, already. Put in the address that your stuck transaction is still trying to send currency to. If an ERC20 token is involved, use the drop-down menu to change "ETH" to the token in trouble. Input your amount into the box labeled... wait for it... "Amount". Click on "+Advanced".
  7. Refer to for the data you will need. Find the page for your "transaction(txn) hash/address" from the transaction history on the wallet/Ethereum-manager you used to send from. If that is unavailable, put your public address that your txn was sent from into the search tool and go to its info page; you should be able to find the pending txn there. Look to open the "more details" option to find the transaction's "Nonce" number.
  8. Put the nonce in the "Nonce" box on MyCrypto; you will contest the pending txn with a new txn that offers larger gas fees, by using the same nonce. If (but most likely "When") the new transaction is processed first, for being more miner-beneficial, the nonce will then be completed, and the old transaction will be dropped because it requests an invalid, now-outdated nonce. Your account will soon be usable!
  9. Go to the Gas Tracker, and it may or may not provide an informative reading. Choose whatever amount you think is best, but choose wisely; if you're too stingy it may get stuck again, and you'd need to pay another txn's gas to attempt another txn-fix.
  10. At the time I write this, I'd recommend 50-100 gwei; to repeat myself, gas requirements are insane right now. To be safe, make the gas limit a little higher than MCW's automatic calculation, you may need to undo the check-mark for "Automatically Calculate Gas Limit".
  11. Press "Send Transaction"!!!
  12. You will need to validate the action through your nano. It will have you validate three different things if you are moving an ERC20 Token. It's a good idea to verify accuracy, as always.
Well, I hope this worked for you! If not, you can let me know in a reply and I'll try to figure it out with you. I like making these in-depth educational posts, so if you appreciate it please let me know; I'll probably make more posts like this in the future!
( Surely this is at least far better than Ledger's "Support" article where they basically just tell you "Yeah, we haven't bothered to make a way to manually select nonces. I guess we might try to make that available for Bitcoin accounts at some point in the future; who knows? lol"... that's not infuriating at all, right?)
Before I tell you how to find your address, I will first make it clear, within the italicized text, exactly which address you are looking for, if you are not already sure:
You may also skip the text written in italics if your issue does not include an ERC20 token, if you wish.
Ledger Live can confuse some users with its interface. On LL, to manage an ERC20 token, you first must go to your Ethereum account and add the token. When you then click on the added token under "Tokens" below the graph chart for your account's ETH amount over time, the screen will then open a new screen, that looks just the same, except focused on the specific ERC20 token. To confuse users further, there is then an option to "Star account", which then add the ETH icon with the ERC20 token's first letter or symbol overlapping, onto the easy access sidebar, as if it was another account of similar independency to the ETH account it was added to.
This improperly displays the two "accounts" relation to each other.
Your ERC20 holdings (at least for any and all ERC20 that I know of) are "held" in the exact-same address as the Ethereum address it was added to, which also "holds" any Ether you've added to it. You send both Ether (ETH) and any ERC20 Tokens to and from only Ethereum addresses of equivalent capabilities, in both qualities and quantities. In all basic terms and uses, they are the same.
So, to know what the problematic account's address is, find the address of the Ethereum account it was added to in Ledger Live.
Now, to find your address on MyCrypto, the most reliable way to find it, that I am aware of, is this:
Open Ledger Live. Go to the screen of your Ethereum address (again, this is the one that you added your ERC20 token, if applicable. If you're not dealing with an ERC20 token, you may ignore everything I've put in Italics). Click on "Edit account"; this is the icon next to the star that may look like a hex-wrench tool. On the new screen-overlay, you will see "> ADVANCED LOGS". Click on the ">" and it will point down while revealing a drop-down with some data that you may or may not recognize/understand. Likely to be found indented and in the middle-ish area, you will see this line, or something hopefully similar:
"freshAddressPath": "44'/60'/X'/0/0",
The "X" will probably be the only thing that changes, and the actual data will have a number in its place; it will not be a letter. Let's now put that line to use in MyCrypto:
Take the 44'/60'/X'/0/0 , and make sure you DO NOT copy the quotation marks, or that comma at the end either.
You can do this before or after copying and/or pasting, but drop the second "/0" at the end; it was not necessary in my case, I expect that you won't need it either, and will probably just make MyCrypto see it as an invalid input.
Okay, now go back to the "Select an Address" screen-overlay in MyCrypto.
Next to "Addresses", click on the box on the right, and you should be shown a list of options to select from in a drop-down menu.
Scroll all the way down, and you should find the "Custom" option at the very bottom. Select it.
A new box will appear; probably directly to the right of the now-shortened box that now displays the "Custom" option that you just selected. This box will offer an interface for typed input. ...yep... once again, believe it or not, you should click it.
Type " m/ ", no spaces before or after.
Type in or paste the data we retrieved from ledger live.
The box should now hold this:
Again, X should be a number. In fact, that number is probably equal to the number of Ethereum (not including any ERC20 wannabe) accounts that you've made on Ledger Live before making the one we're working on right now! (1st Eth. Acc. would have: X = 0, 2nd: X = 1, 3rd: X = 2, ...)
Make sure you've included every apostrophe ( ' ), and solidus ( / ); there is NO APOSTROPHE for the "m" at the start and the "/0" at the end!
If you press the enter key or click on the check-mark to the right of where you typed, the appropriate addresses will be generated, and the address you created through Ledger Live should be the first one on the list!
Select your address and press "Unlock", and you are now accessing your account through the MyCrypto app's interface!
In order to access your ERC20 token, you will need to add them first.
You may have to scroll down, but on the right-side of your unlocked account screen, you'll see a box with "Token Balances" as its header.
Click "Scan for tokens". This may take a short bit of time, and when it's done it may or may not display your ERC20 token. If it worked, you can head on back to the main part.
If you got the result I did, it won't display your token, or, if our result was exactly the same, it won't display any at all. However, you should now have the "Add Custom Token" option available, so see where that takes you.
You should discover four boxes, specified in order (Address/ Decimals / Token_Symbol / Balance). You may only need to fill in the "Address" box, but if you need to fill others, you'll find those with the token's address; here's 2 ways to find it, if you don't already know.
Method I:
Since you've probably already been managing your token with Ledger Live, you can go to the LL screen of your "account" for that token; Right next to the account's icon, and directly above the name, you'll see:
Contract: 0x??????...????????
Yes, go on; click it. You'll find the token's page on Etherscan; this was just a shortcut to the same place that both of the two previously referenced methods lead to. Skip to method... III?
Method II:
Go to, or a similar Ethereum-blockchain-monitoring website, if you have a different preference. Search for the name of your token, and you should be able to see it as a search result. Activate your search manually of by selecting search option. Continue on with Method III.
Method III (Iⅈ what makes you think there was a third method? I said 2!):
At this point, you should find the "contract address" somewhere on the screen. This is the identity of the creature that breathes life into the token, allowing it to exist within the world of Ethereum. Steal it, and tell MyCrypto that you've left some of "your" tokens in the address of your ledger's Ethereum account. MyCrypto will trust and believe you without any concern or doubt, just by putting "your" contract address in the box for "Address"; it's almost too easy!
Well whaddya know, this one isn't actually too long! Don't tell anyone who may have taken a little longer whilst finding out how to do it themselves, though. There's value in trying to do something on your own, at least at first, so I'll let them think they made the right choice (¬‿¬). But take this star for humbling yourself enough to seek further help when you need it, since that is a very important life skill as well!
Now, back to the useful stuff at the top...
EDIT: A comment below made me realize that this info should be added too. Here is my reply to the comment saying I could just use MetaMask. I said in the title that this guide is for questions where MEW and MetaMask aren’t working, but I guess it’s easy to miss. I used my u/caddark account to respond:
(Using this account because u/caddarkcrypto doesn’t meet the karma/age standards to comment; the post had to be manually approved.)
I guess I didn’t make it entirely clear; sorry:
The target audience for this guide is anyone with a stuck Ethereum transaction that was initiated through Ledger Live AND are experiencing the same difficulties I had encountered while trying to fix this issue for myself.
This wasn’t any regular stuck Ethereum transaction. Apparently before, there was an issue that made a Ledger Nano nearly impossible to connect to MetaMask (which is also Brave Browser’s integrated “crypto wallet” for the desktop version) and/or MEW (also perhaps any other browser wallets made for chrome and/or brave) that I heard was supposed to be fixed in a recent update. It might’ve been mostly patched, idk, but during my experience, (in which I was using the latest version of Ledger Live that is available right now,) that issue still remained.
The really weird part was that it successfully connected to the browser wallets again after I fixed the stuck transaction. At first I thought that somehow the txn was what was bugging the connection. However, later, during no txn issues, I was again unable to connect.
Seeing the same connection error again later, I opened up the MCW app I downloaded the day before, and was going to just use that. While in the process of operating MCW, I suddenly had another idea to try for the browser wallet so I went back to that just to quickly test it.
The browser wallet worked perfectly...
I don’t know how, but I think that somehow, something in MCW’s software, makes the browser wallets work. They don’t work for me without having MCW opened in the background first.
EDIT 2: Markdown decided to stop working after I did the first edit... I might fix it tomorrow... how did that happen though??? What did I do?
EDIT 3: nvm, I'm just fixing it now; I won't get much sleep tonight I guess.
submitted by CaddarkCrypto to CryptoCurrency [link] [comments]

Mining bitcoin in college (free electricity!)

I am working with a friend to set up a bitcoin mining rig our university. I'm a business major, but my friend is in engineering and has unlimited free access to a 220v power supply. Would it be worth buying 100 AntMiner S9's on eBay and making our own rig?
The math breaks down as follows according to
1350 TH/s hashrate (with 100 S9s at 13.5 TH/s for each unit)
Electricity cost is zero.
Predicted payout is $3,390/month.
Am I missing something? It seems too good to be true, making 4k/month with only 10k up front.

EDIT: Assume the rig was well hidden and not discovered for a few years.
submitted by josiahkitching to Bitcoin [link] [comments]

Bitcoin at $ 288,000? BTC price shows bullish signal like 2016

Bitcoin at $ 288,000? BTC price shows bullish signal like 2016
Bitcoin's price development has been relatively stable in recent weeks.
The cryptocurrency has been trading in the $ 9,200 range since early June, which is the price at the time of publication.
However, Bitcoin is currently showing signals that could indicate an upcoming bull market.
According to a report by the Kraken Stock Exchange, Bitcoin is only a 10% jump away from entering a massive upward trend.
As Kraken describes, to enter a bull market, Bitcoin must break the key resistance at $ 10,500, as shown below.
With that in mind, the report says Bitcoin could soon break resistance or take the risk of testing support at $ 6,000 to $ 7,000.
This would end a period that some analysts have described as very stable. In fact, this is similar to the price development in 2016 and 2017, when Bitcoin initially tended to move sideways for a very long time and finally reached its all-time high of USD 20,000 in late 2017.
According to analyst Moon Capital, the Bitcoin hash ribbons have crossed, revealing a massive buy signal that has historically pushed Bitcoin's price up. The signal was also there before the 2017 Bull Run.
Therefore, the analyst predicts that BTC will rise to $ 288,000.
The "hash ribbons" indicator is based on the hash rate of the Bitcoin network.
It is calculated by comparing the short-term moving average and the long-term moving average of the Bitcoin hash rate. As soon as these two cross, a bullish indicator is generated.
A breakdown is considered bearish.
Capriole's digital asset manager, Charles Edwards, also noted the formation of this indicator.
However, Edwards recommended waiting until midnight today (July 12th UTC) for the crossing of the hash ribbons to be confirmed. He also said the BTC price for confirmation should close above $ 9,230.

Bitcoin fundamentals support upcoming uptrend

On the other hand, Bitcoin's fundamentals seem to support a bull market. Bitcoin's hash rate has increased significantly since the difficulty adjustment in June.
According to, the hash rate of Bitcoin reached a new high of 125.99 terra hashes per second (TH / s) on July 7.
In this context, analyst and inventor of Bitcoin's stock-to-flow model, Plan B, said Bitcoin has weathered the worst of the past few months.
In addition, he stressed that the cryptocurrency will soon peak at its hash rate, confirming the good health of the Bitcoin network.
submitted by jakkkmotivator to thecryptobasic [link] [comments]

Actual cost of a 51% attach, $10.2 million

So I was discussing this last week and honestly it all felt too simple, so I'm trying to get some stronger counterpoints to this argument. Goes something like this.
You have some pool miner that wants to do a 51% attack. Lets assume the attack has three phases, the first phase is to try to accumulate 51% of the hashing power, next is the accumulation of more hashing power by ejecting other pools from through reorg. Finally when they aquired enough mining power they could blacklist exchange hotwallets or all manner of nefariousness. Lets further assume that everyone will act purely in their own self interest. For simplicity lets call the attacker "Spectre Pool".

Accumulation Phase

Assuming Spectre Pool can hit something like 41% of the hashing power, the first goal is to accumulate more resources to hit 51%. Since pool mining is a commodity market, all Spectre has to do in this imaginary world is offer more than the market rate. Since they are already at 41% hashrate, they need to entice another 10% of the market to come to their pool. The obvious way to do this would be to offer a "new customer bonus" or something like that. Some promotion where they pay 1% above market price for the hashing power of pool members. So, given a network hashrate of 116.73 EH and a market rate of 0.101 USD/TH per day, the cost they would have to bear to offer a 1% promotion to entice 10% of the network would be:
116.73_EH / 0.101_USD/TH * 10% * 1% = 1,155,742 USD per day for each 1% "bonus"
So, assuming they were willing to spend that much on "marketing", and that all miners worked in their own self interest, eventually they could lure enough miners over to achive 51%. Once they hit this threshold they could scale back on the "marketing" and thus reduce their daily burn.

Acceleration phase

Once at 51%, the next attack of Spectre will be to put their smallest competitor out of buisness. Lets call that the "Bond Pool", and pretend that Bond has 1.5% of the network hashing power. To put Bond out of buisness, with 51%, Spectere will need to reorg whenever Bond wins a block. By reorging to a chain without Bond, this will put Spectre one block behind and they will need to catch up. Once the reorg begins, Spectre will need to produce the longest chain on its own while starting one block behind. So we need to determine how long (statisticly) it will take Specter to produce n+1 blocks and compare that to how long (statisticly) it will take Bond to win one block.
Although this can be hammered out in an iterive calculation, a better approach will be an algebraic solution. Lets walk through the equations:
You can put the following into a GeoGebra CAS calculator to substitute and simplify the equations
solve(n*m = s*(n+1), n) M = 1/2-d S = 1/2+d m = t/M s = t/S solve(n*m = s*(n+1), d) n = s/(m-s) b = m*M/p solve(b = s*(n+1),p)
This will produce the following equations for the values we are interested in.
m(t,d): t/(1/2-d) # from `m` define s(t,d): t/(1/2-d) # from `s` define n(s,m): s/(m-s) # from `n` solve d(n): 1/(4*n+2) # from `d` solve p(d): 2*d # from `p` solve b(t,p): t/p # from `b` define
Plugging the equations into excel produces the following (assuming t=10)
n d p m s b
25 0.98% 1.96% 20.40 19.62 510
20 1.22% 2.44% 20.50 19.52 410
15 1.61% 3.23% 20.67 19.38 310
10 2.38% 4.76% 21 19.09 210
5 4.55% 9.09% 22 18.33 110
4 5.56% 11.11% 22.50 18 90
3 7.14% 14.29% 23.33 17.50 70
2 10% 20% 25 16.67 50
1 16.67% 33.33% 30 15 30
So once d=0.98%, Specture will have 50.98% of the hashing power, allowing him to eject 1.96% of all blocks mined at will. Of course this is all statistical, so Spectre will want some margin for randomness. So it would make sense to attach 1.5% of the blocks when Spectre reaches 51%
So once Spectre reaches 51% he has enough hashing power to prevent any of Bonds blocks (1.5%) from being included. Spectre can win a reorg (statistically) every 8.5 hrs and Bond can only produce a block (statisticly) every 11.1 hours. So once this attack starts, Spectre simply flashes his promotion to lure the miners in the Bond pool (who are receiving no reward) over to the Spectre pool. If he only gets one third of them, then he can increase his influence to 52%
Doing the same math again, with 52% Spectre can ice out any pool who has up to 4% of the hashing. Then running the promotion, Spectre will try to get 40% of the "homeless miners". Now Spectre's power grows to 55% giving him the power to ice out 10% of his competitors. This can cascade on and on until Spectre is the only public pool left.
Now, at 51% the attack and reorgs take many hours, but as more and more pools get targeted, more and more miners will jump ship and end up at Spectre so long as they can hold the promotion. Bond's only choice would be to either close up, or leverage everything and mine at a loss for weeks hoping that Spectre eventually drops below the threshold for his attack.
Of course Spectre has even more tremendous expenses. To offer the 1% promo to 10% of the network would cost Spectre $1.16 million / day, or 3.52 million per month for each percent of miners it lures over. So going from 41% to 61% would cost Spectre $70.3 million / month, but at that point he can attack 20% of the network giving him a reach of about 80% which is pretty much the entire pooled mining capacity today. Seems like $70 million is a small price to pay to buy the entire bitcoin network.
Other expenses Spectre would accrue would be related to the attacks and reorgs. The early attacks will take hours and throughout Spectre needs to continue payouts to the pool even though he is generating no BTC durring the attack. So long as his chain is orphaned, his blocks have no value. Only after the attack and reorg when his chain becomes longest will he be able to claim the block reward for all the blocks he minded. This (in my opinion) will the the hardest challenge. The first attack and 25 block reorg will require Spectre to put his entire 51% hashing power on an orphaned chain for 8 hours requireing $208.6 million in payouts. Once he wins the attack and the chain reorgs he can cover his expeses with the block reward, but borrowing $208 million for 8 hours is still a very difficult thing to pull off. The interest alone on the attack is over $40,000 (20% interest compounded continually). Below is a table of the calculations
Specte Bond Promo Cost Hrs Blks Levrg / Block Reorg Leverage Rate Int Cost
51.00% 1.50% $1,155,743 8.497 25 $8,025,990 $208,675,743 20% $40,485
51.50% 2.50% $1,232,745 5.825 17 $8,025,990 $144,467,822 20% $19,215
52.50% 4.50% $1,336,143 3.492 10 $8,025,990 $88,285,891 20% $7,039
54.50% 7.50% $1,562,998 2.141 6 $8,025,990 $56,181,931 20% $2,746
58.50% 14.50% $2,023,385 1.140 3 $8,025,990 $32,103,960 20% $835
66.70% 33.30% $2,970,442 0.500 1 $8,025,990 $16,051,980 20% $183
Of course, once Spectre gets 2/3 of the hashing power he controls the entire chain since he can include or exclude any block he wants. So this "Total Self Interest" simulation of a 6 day attack puts Spectre's expenses at $10.3 million in promotions and $71,000 in interest, or about $10.4 million total.
1 - All "hashes" are hashes per second
2 - TH = 1012 or 10004 hashes per second
3 - EH = 1018 or 10006 hashes per second
4 - Assume a market rate of 0.101 USD / TH / day
5 - Assume an average daily network hashrate of 116.73 EH
submitted by brianddk to brianddk [link] [comments]

Test post

TH = 1012 = 10004 hashes_per_second EH = 1018 = 10006 hashes_per_second
0.101 daily USD per TH/s
116.73 EH/s
So I was discussing this last week and honestly it all felt too simple, so I'm trying to get some stronger counterpoints to this argument. Goes something like this.
You have some pool miner that wants to do a 51% attack. Lets assume the attack has three phases, the first phase is to try to accumulate 51% of the hashing power, next is the accumulation of more hashing power by ejecting other pools from through reorg. Finally when they aquired enough mining power they could blacklist exchange hotwallets or all manner of nefariousness. Lets further assume that everyone will act purely in their own self interest. For simplicity lets call the attacker "Spectre Pool".

Accumulation Phase

Assuming Spectre Pool can hit something like 41% of the hashing power, the first goal is to accumulate more resources to hit 51%. Since pool mining is a commodity market, all Spectre has to do in this imaginary world is offer more than the market rate. Since they are already at 41% hashrate, they need to entice another 10% of the market to come to their pool. The obvious way to do this would be to offer a "new customer bonus" or something like that. Some promotion where they pay 1% above market price for the hashing power of pool members. So, given a network hashrate of 116.73 EH and a market rate of 0.101 USD/TH per day, the cost they would have to bear to offer a 1% promotion to entice 10% of the network would be:
116.73_EH / 0.101_USD/TH * 10% * 1% = 1,155,742 USD per day for each 1% "bonus"
So, assuming they were willing to spend that much on "marketing", and that all miners worked in their own self interest, eventually they could lure enough miners over to achive 51%. Once they hit this threahold they could scale back on the "marketing" and thus reduce their daily burn.

Acceleration phase

Once at 51%, the next attack of Spectre will be to put their smallest competitor out of buisness. Lets call that the "Bond Pool", and pretend that Bond has 1.5% of the network hashing power. To put Bond out of buisness, with 51%, Spectere will need to reorg whenever Bond wins a block. By reorging to a chain without Bond, this will put Spectre one block behind and they will need to catch up. Once the reorg begins, Spectre will need to produce the longest chain on its own while starting one block behind. So we need to determine how long (statisticly) it will take Specter to produce an n+1 blocks and compare that to how long (statisticly) with take Bond to produce another block.
Although this can be hammered out iterive calculations, a better approach will be an algebraic solution. Lets walk through the equations:
You can put the following into a GeoGebra CAS calculator to substitute and simplify the equations
solve(n*m = s*(n+1), n) M = 1/2-d S = 1/2+d m = t/M s = t/S solve(n*m = s*(n+1), d) n = s/(m-s) b = m*M/p solve(b = s*(n+1),p)
This will produce the following equations for the values we are interested in.
m(t,d): t*(1/2-d) # from `m` define s(t,d): t*(1/2-d) # from `s` define n(s,m): s/(m-s) # from `n` solve d(n): 1/(4*n+2) # from `d` solve p(d): 2*d # from `p` solve b(t,p): t/p # from `b` define
Here's a table
n d p m s b
25 0.98% 1.96% 20.40 19.62 510
20 1.22% 2.44% 20.50 19.52 410
15 1.61% 3.23% 20.67 19.38 310
10 2.38% 4.76% 21 19.09 210
5 4.55% 9.09% 22 18.33 110
4 5.56% 11.11% 22.50 18 90
3 7.14% 14.29% 23.33 17.50 70
2 10% 20% 25 16.67 50
1 16.67% 33.33% 30 15 30
solve(nm = s(n+1), d) n = s/(m-s) b = m*M/p
``` Tb = The avg time between blocks won by Bond durring the reorg Ts = The avg time for Spectre to produce a block durring the reorg Tm = The avg time for the main chain to produce a block durring the reorg n = The number of blocks Specter will need to reorg
Tb = 10_min / 49% / 3% = 10.89 Hrs Ts = 10_min / 51% = 19.61 Min Tm = 10_min / 49% = 20.41 Min
Solve for the amount of blocks Specter can reorg Tmn > Ts(n+1) Tnn > Tsn + Ts n > Ts/(Tn - Ts) n > 24.5
Therefore: Spectre can produce 26 blocks faster than the main chain can produce 25. Specter has to win the reorg before Bond produces another block
Assert: Ts * (n+1) < Tb 19.61_min * 26 < 10.89_hrs 8.50_hrs < 10.89_hrs ```
So once Spectre reaches 51% he has enough hashing power to prevent any of Bonds blocks from being included. Spectre can win a reorg (statistically) every 8.5 hrs and Bond can only produce a block (statisticly) every 10.89 hours. So once this attack starts, Spectre simply flashes his promotion to lure the miners in the Bond pool (who are receiving no reward) over to the Spectre pool. If he only gets one third of them, then he can increase his influence to 52%
Doing the same math again, with 52% Spectre can ice out any pool who has up to 7% of the hashing. Then running the promotion, Spectre will try to get 40% of the "homeless miners". Now Spectre's power grows to 55% giving him the power to ice out 16% of his competitors. This can cascade on and on until Spectre is the only public pool left.
1 - All "hashes" are hashes per second 2 - TH = 1012 or 10004 hashes per second 3 - EH = 1018 or 10006 hashes per second 4 - Assume a market rate of 0.101 USD / TH / day 5 - Assume an average daily network hashrate of 116.73 EH
``` solve(nm = s(n+1), n) M = 1/2-d S = 1/2+d m = t/M s = t/S solve(nm = s(n+1), d) n = s/(m-s) b = mM/p solve(b = s(n+1),p)
m(t,d): t(1/2-d) # from m define s(t,d): t(1/2-d) # from s define n(s,m): s/(m-s) # from n solve d(n): 1/(4n+2) # from d solve p(d): 2d # from p solve b(t,p): t/p # from b define ```
submitted by brianddk to brianddk [link] [comments]

Check my math: With $50k of hashpower over a 24 hour period, there's a 75% chance of me giving a transaction 1 fake confirmation, a 1% chance of me giving it 2 fake confirmations, and a 0.01% chance of 3 fake confirmations? Thanks

Edit 1: By "fake" confirmations, I mean the kind that allows me to reverse/double-spend the transaction as referred to here :
Edit 2 : If directly using NiceHash wouldn't work for such an attack (being a mining pool) then instead can we just use their rate as an approximation of the cost of hashpower to mine such transactions as an individual.
Original post :
NiceHash currently offers 180 TH/s for 24 hrs for $50. Assuming they could give me $50k of hashpower at this rate, that would be 180 PH/s for 24 hrs. That's 0.3% of the 60 EH/s approximate total hash rate of the bitcoin network. According to that gives me a 0.6% chance of getting 1 confirmation per block, or a 99.4% chance of not getting that 1 confirmation in 1 block, or a 0.994240 = 23.6% chance of not getting 1 confirmation in the 240 blocks of the 24 hour period. So that's just over 75% chance of getting 1 fake confirmation in 24 hrs for $50k. The same process gives a 1% chance of getting 2 confirmations in 24 hrs, and a 0. 01% chance of 3 confirmations. Is this a reasonable way of calculating of how "fake" confirmations might be achieved?
submitted by ZedZeroth to Bitcoin [link] [comments]

To address concerns about my identity

Doubts about my identity seem to crop up, so I like to address all those once more. Hopefully in a comprehensive way.
First of all, to explain the situation from my article again, is my go-to service. Usually, 24h is plenty and suffices to timestamp everything.
But in this case, Core went quickly ahead with release information, which made the 24h window (due to fees) too small to conclusively prove ownership on the BTC chain.
But let's have a look in detail. This is the text that I wrote:
BitcoinABC does not check for duplicate inputs when processing a block, only when inserting a transaction into the mempool. This is dangerous as blocks can be generated with duplicate transactions and then sent through e.g. compact block missing transactions and avoid hitting the mempool, creating money out of thin air. awemany 
If you SHA256 this, it calculates to: 5c45a1ba957362a2ba97c9f8c48d4d59d4fa990945b7094a8d2a98c3a91ed9b6
Exhibit A: I timestamped that here:
Note that there is a timestamp when it entered their system, which is before anything else became public and which is:
17.9.2018, 14:54:19 CEST
It shows it in your local time zone in your browser, a fact that Peter Todd apparently tripped over as well:
Scroll down to "Submission to OriginStamp" at the end.
This timestamp is, however, just from their service and thus centralized. But if you think I faked that, that would mean that I must have hacked their service in time to do so. In the last few days. Furthermore, the window for this hack would be quite small, as there is also a later submission into the blockchain. So if you doubt this information alone, it would mean I'd had to hack the service in time (within a few hours window) just to claim this identity, leave no trace of all of this, face the risk of being called out by the true finder of the bug (who'd be different then) and write this long article ...
But there's more:
Exhibit B: For anyone who is a member of the BU slack, I posted a message that was the above hash (as I said in my medium article) and which is still sitting unedited on the slack as well, in the #general channel. There are likely several hundred members of this slack, and all of them who read it should have seen this message in time. I believe there are also (well-behaved) Core supporters in there. I would need to have hacked that service in an undetected way as well and fool or collude with all active members therein as well. That now creates a pretty big collusion, don't you think?
Exhibit C: Finally, let me close with this PGP signed message. I created a PGP key just to keep my identity separate, at least for a while, from my main pseudonym awemany. And in the email I send out to the developers, I have added myself as a recipient. Even though the message has not been signed (I didn't see any reason to do so at the time of release), my full key id is still in this message. And that is, as far as I know, a 128-bit hash for which it is practically impossible to find a preimage for. This explicit 'encrypt-to-self' is because I fucked up with PGP encryption in the past (because, as I say in my article, mistakes just happen) and I wanted to at least be able to read my own encrypted message later. I have created sitations for myself where I wasn't able to read my own encrypted emails. Yes, call me a crypto noob, say PEBKAC or whatever, it is exactly an example of why I am saying that I am not perfect but so is no one else!
Here is this message, which I am sure anyone owning the original disclosure email is happy for you to confirm that it is the same key id:
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 This messsage is signed by the beardnboobies GPG key that I created just in time for the vulnerability disclosure. In reality, I am awemany on reddit and elsewhere. -----BEGIN PGP SIGNATURE----- iQGzBAEBCgAdFiEERGszUXtt2s3Wfkt1yydp8d93NcQFAlumBkAACgkQyydp8d93 NcQvegwAmcfqKSp/RZVE6HIyN9gbxa5oz2YFaaoeVCoQTsDZPX08zjBjp7jzMUGW izraVk+yOz8Yxdv7re8G+CBqnpgfpNvMoHPe75bgoyKzavTtukVSScDUHZ9Tu9D7 xQcfWnwZhsUjsTsxFD7B6PLAWzeh7cA3d0xUwrFJoa//hlOylnlC/76cbBspqSll ispvQgBcEM6NfKvmCTb9LItts2/QrXX891LK9I4vPC1WpOrXPA9lNnuuP8/S/ey9 O7iqwW+oCwGKLELQJE58hgwt7keQukrPEfwUtBXACW77gtk1dXaxRL5RqCkmMsMn rBMkTGmjDit+AVE/5oW+flds8/Hq+kQDXUZfaLbnOrleW50LTTi+etA/PPhHxe45 CUD7Jm8d2LbTIjFWsZT/Rq2Djsy3gBcHeKqFMRXEBI7WoFe431q38gVSyfvbCrPR R4AJsg2eGgysu0E/SZecHHULc4CU6RdLmCRrORRSv1T9tOyJcRpfwRlE4FnT9LTC /+5v9mXI =k2oE -----END PGP SIGNATURE----- 
And here is the public key which matches that key Id and which has likewise not been made public yet:
-----BEGIN PGP PUBLIC KEY BLOCK----- mQGNBFufufgBDADJ3N5xocCOSyRrF42nvrujUZXRPnaq+X3E0GjNlCwuCFZELNE9 l950cR4l+sNFbjcvWtlCgAdHPAggED3ZeutTO3fAIClN+LOgnyEF4txjdG72j9L4 NnCVMfKhT2yc7JZQh3lS+GHFSBS8joLq09GxllTORvdawuW34yzV4rzFZZ3NfK+/ 8BtNAf+nXvtafugw4Nlln5LPvGna9bmh/74RlZTAJeV52a/WsucBQ7kVuWTAERMy N+DuvUIxh7gG9KbSQXsPQ+1ZleO9+nWJs4pgX3ro6ZRMYvN9jeJsDjx2uQoL77zM RwMKNis5ifxnkHmExOG01SQxz3j9tw1anC8dFi2zs9jlr+qjUofSUT0RctKNJlga BgDV1dsu8dg11xxo4slH93D5LqJJs3lg+RjxHeWE6Oxvpz4SQpU+sLT4T73xOh/d GDw4UmLMUgKjjlYexVhlNk6FUamAkpYzuTgN35AeUt1iGj9D9XAbbi0G3MjKYSX6 tPkBC5h7XIGDzGcAEQEAAbQuQmVhcmQnbidib29iaWVzIDxiZWFyZG5ib29iaWVz QHByb3Rvbm1haWwuY29tPokB1AQTAQoAPhYhBERrM1F7bdrN1n5LdcsnafHfdzXE BQJbn7n4AhsDBQkDwmcABQsJCAcCBhUKCQgLAgQWAgMBAh4BAheAAAoJEMsnafHf dzXEi0gMAL0StgXSH4mbHPeyj0pJOmzOpEsfm7S05EKoGnMzmB/ZfCxag9YvDSSQ Jz28jOmPIrnLLkuOFcf0BnSKmys2WbEpGm5SgRU0anSTiiaTy2RjPa8eC34F6X/q LjgJ6J4hvOoDkQAjOzfspayRjRmFewNzssMHn6JC2NWvP+8+nClsJA959E9rxJ5F xaPmPZ9g4AJFah/vpRXbv44JQGbjr42CdB2JUTYW3rd7WjYFdcGcPU0UQhRQSflL 2ZOCw8bJCdPRRXpy2xTewTPE4eVcrclvmbKDhDbDNkY9cqDSPqag2JG8GoPsl3Ym 33uwzN1Y5qkocfGoVxr3eEEFQgkPnqX27OyGAL1+MoEOYuLuhUaNX2E/WmPZwtU3 E5JdjdIRfVfzI+oWs6Mfn1mbxeePBikjHgNgr4vs2+DkujeenS8UsD5Y6qrk9Ypt Erh5GRT0BauSSV52U3mEboMyxRHriObFT+BQAK0cJ4ZZ9aAUVLZcC4TXps2PKcjZ ozJYgvFm1rkBjQRbn7n4AQwAx7JiWJSuwAidK0AcPS2kt5gpzsESgxq1qyoeELYg tNb6G2SihbFj4hVMjc8Ol+a0wtcd+3D7Wcyu5EDbfnIydfmytIvF6CABWCkKtulG lxKSydMg16QGMwWixqTLRo1FoCdAzvKJktTshIlARoRt1cII/5n0C+Ny33kdm809 c+5EPFW22Hu5cNZR6xjYkONoM+Gw9JVIo5O9DY1l2s7qaQhnnTQDMBJLZjtOVFZF l/QQjnM5SJZr7lkzNMOgdA3saCbjk7NVMnV8ledLHYZguR3lDfsfdwWvw9Q3tEp9 Ii5P3AHzzV7eu0g6T7xpjV4LNssP1abvrBBd/RFfA6A3ec9wXEWTk2ewXpZLkicm 9VBy3nsz5bedoAvcyTVB0HF80yHbo99eSwEUenlrs0K0Yv97hxJ2ioPrhx4y7M9Q XRWRXFRaLBgLT5GxvIs9jRWJq7jwtKknA7GSun06UFKnOmiT81dmVf4Dne1F9y/R U7ld9Doo7IARUYP11/twEh5HABEBAAGJAbwEGAEKACYWIQREazNRe23azdZ+S3XL J2nx33c1xAUCW5+5+AIbDAUJA8JnAAAKCRDLJ2nx33c1xMiGDACbqHLuXMZ2937O aDfuchIYJ7BoqLiY+Po0V78jenYcx4pXXnau2rL44f02B6nV5RK21b+PwFDX+SMh usQfAYdBBRxIb0uDePKx2/Vb0UC5yb456eprYBXOIN7odl0J68PpjUQik5kqizig n/vyrIMMQehnFFee88xdSUYK495I6URJtIp6YLCYoalFs49l3szLJZK57OcCmfsR gzQbBIsPqQ7uqKZlGYZY9a/PYEZd3Lb6qLF693jZyNjDZ8IIfBjvJa3ZwJiTtNXi NknfmW2KcokFljOa5Fvs6Gu11Q9KpbVRpkKeHF79TSN5lPSwvBjsBbx9j4KoFBum yNNQTclRMe+AWHfcnoIXooFemiv27n6HEwoFEyoKm3ita1V+RiDuZ1e3FEA4zUPO XlZv6e7p+Cd0coP4FDWR5mq1ck+SOFoFuqNrqpEIumrHEC4wKcIA7iy/jJ5frgab UjEcFa/MBAaZ7If9+3kHh2kpfPwLOT+7Mm7i9kD1Yu3UBvwoYOE= =DyTh -----END PGP PUBLIC KEY BLOCK----- 
I am not going to disclose the original email just yet, because there is exploit code in there. Even though I think that exploit code is quite simple and will likely not do harm, there is no reason to add more risk and this could also still be used against me by trolls by being called irresponsible. So I hope folks understand why I refrain from that for now.
submitted by awemany to btc [link] [comments]

Are New Bitmains’ ASIC Devices Profitable?

Are New Bitmains’ ASIC Devices Profitable?
You might have heard that Bitmain has announced the next generation Antminer ASIC mining devices.These devices (S17+ and T17+) are expected to deliver higher hash rates while keeping relatively comparable energy consumption rates.
Bitmain stays true to itself and regularly releases new hardware on its Antminer line. Usually, their products are the top ones on the market in terms of hash rate, but it’s always just a matter of time until the competition catches up.
Also, there is another problem with third-parties pre-empting the devices and then reselling them at a much higher price. One can only hope that this time Bitmain manages to deliver a reasonable amount of devices.
This time, Bitmain is releasing two devices: S17+ with a hashrate of 72 TH/s that is consuming around 2,920 watts of power and an ‘economy class’ T17+ with 64 TH/s and 3,200 watts of power consumption.

What’s the Profit?

So how profitable it is to run one of these devices considering the current state of market? According to Blockonomi’s calculations, S17+ is profitable to operate, but if you’re hoping for big wins, that’s not going to happen. Assuming an electricity price of $0.10 per kilowatt and running your device for 24/7 for an entire year (no change in difficulty considered) you can expect to earn about half a bitcoin. However at the end of the day, it all comes down to electricity costs.
As for T17+, you could get about 0.45156798 BTC, at the cost of $2,8 in electricity fees.

Is it worth it?

Like everything in the crypto space, this is very hard to predict.
Once these devices hit the market, they will set the hash rate standard, which means increasing network difficulty and lowering the efficiency of the hardware.
Moreover, the bitcoin prices have been bouncing around the $7,500 to $8,000 mark for a while, and if your goal is to sell all of the bitcoin you’ve mined right away, you would probably be able just to cover the equipment and electricity cost after one year but nothing more.
If you are determined that ASIC mining is your thing, it can be a good idea to buy one of these devices but avoid purchasing it from the resellers.

The Bottom Line

No matter which equipment you decide to go with, you can use CoinFly to increase your profits.
We offer you an opportunity to mine the most profitable currency and optimize the mining profit automatically: once the situation on the market changes, the system will just switch to mining the most profitable coin, thus, you will have the possibility to tune your hardware online to achieve optimal performance.
Sign up for our beta-testing and check out the benefits of mining with CoinFly!
submitted by coinfly to CoinFly [link] [comments]

The difference between GPU and CPU mining

The difference between GPU and CPU mining

GPU Mining
  • Coins Mined with CPU: Ethereum, Monero, Bitcoin Gold, Zcash, Electroneum, and many others
GPU (or Graphics Processing Unit) is the chip on your graphics card that does repetitive calculations for processing graphics and was initially used mainly by gamers for better graphics. But once Ethereum came along people started buying them up, the price skyrocketed and now there is a certain shortage of gaming graphics cards on the market.
Ethereum Mining with GPUs
All Ethereum based coins use the Ethash algorithm for mining, an algorithm “designed to be ASIC-resistant via memory-hardness.” There might be several reasons behind this, one of them being the possibility of Ethereum switching from Proof of Work to Proof of Stake.
And since ASIC mining is off-limits for Ethereum, using a GPU is a good alternative.
CPU Mining
  • Coins Mined with CPU: Monero, Electroneum, and Bytecoin
The CPU is the Central Processing Unit of any computer. Basically, it is the brains of the computer.
When Bitcoin was first released, you could mine 100 coins a day using just your CPU, which is impossible today.
CPU design optimizes for quickly switching between different tasks. If a coin allows CPU mining, there’s less power in the hands of large mining farms because everyone who has a computer can easily start mining.
The hashing required for Proof of Work is a repetitive mathematical calculation. CPUs have fewer arithmetic logic units, circuits that perform arithmetic operations, and thus are relatively slow when it comes to performing large amounts of calculations.
The Main Difference
GPU mining is the more powerful and lucrative version of CPU mining and yields a better return on investment. GPUs offer a higher level of processing power which in some cases are up to 800 times more than that of a CPU.
#mining #blockchain #ethereum #fintech #bitcoin #MiningOS #COS#CoinFly #CoinflyCOS #GPUmining #Software
submitted by coinfly to CoinFly [link] [comments]

My Recent Experience With Genesis Mining // Read This Before You Buy A Contract

I put $8,200 USD on a total of three Genesis Mining contracts for 50 TH/s of hash power last November, and which only went into effect a mere six months ago in February/March of this year. Now, they're in danger of becoming terminated in less than 60 days because of the low BTC price + increased hash rate difficulty. I had done a bit of research beforehand and tested out some hash rate mining scenarios that may occur at some point in the near future; even multiplying the then hash rate several times over, while keeping the BTC price relatively average (back then it was around the $8K mark and rising).
In all my benchmarks, the amount of hash power I had purchased appeared to make a profit, albeit a small one in even an increasing hash rate difficulty scenario—but never did I imagine that the contract would become unprofitable in such a short period of time. I thought I'd be able to ride it out for at least 1–2 years and either make my ROI or hold for longer to make a possible margin of profit. Plus, my payouts (when they were being generated) never reflected the numbers I had come up with using mining calculators during my research phase; instead, I was only generating half of what was depicted, which was another unexpected curve ball.
Genesis Mining had the audacity of sending out an email about two weeks ago where they stated the following:
In a couple of days, we will roll out a very special offer only for our existing Bitcoin Mining customers. You better stay tuned!
So that very special offer arrived earlier today via another email, and if was for existing customers to upgrade to the new Radiant contracts for $180 per 1 TH/s, which if you do the math would come out to $9000 for the 50 TH/s (or more than I had paid for the original contracts to begin with). They also callously stated in that same email:
As a result, some user contracts are now mining less than the daily maintenance fee requires to be covered, and thus they entered the 60 days grace period, after which open-ended contracts will get terminated.
Although I agreed to Genesis' terms prior to signing up, I never imagined this scenario unfolding in such a short time; however, for them to also add insult to injury with a deplorable marketing scheme as the one I illustrated in the email above should hopefully give you an idea of who you'll be doing business with, in case you're considering a cloud mining contract with them. My advice to anyone interested in cloud mining would be to either pay for your own equipment and mine the BTC yourself, or better yet, buy the BTC directly from an exchange, especially right now while its price is relatively low and hold onto it. I would discourage anyone from pursuing cloud mining as you'll most-likely have no legal recourse since you'll be dealing with a foreign entity that's not bound by the same laws or ethical requirements as the ones in your country.
submitted by dutch602 to GenesisMining [link] [comments]

Why is it so hard to mine for bitcoin?

Why is it so hard to mine for bitcoin?
Bitcoin mining has become more competitive than ever.
Bitcoin mining difficulty – the measure of how hard it is to earn mining rewards in the world’s largest cryptocurrency by market cap – has reached a new record high above 7.93 trillion. That’s a seven percent jump from the 7.45 trillion record set during the recent two-week adjustment cycle, which was the highest since October 2018.
Bitcoin is designed to adjust its mining difficulty every 2,016 blocks (approximately 14 days), based on the amount of computing power deployed to the network. This is done to ensure the block production interval at the next period will remain constant at around every 10 minutes. When there are fewer machines racing to solve math problems to earn the next payout of newly created bitcoin, difficulty falls; when there are more computers in the game, it rises.
Data from Bitcoin Block Explorer -
Right now the machines are humming furiously. Bitcoin miners across the world have been performing calculations at an average 56.77 quintillion hashes per second (EH/s) over the last 14 days to compete for mining rewards on the world’s first blockchain, according to data from mining pool.
Data further indicates the average bitcoin mining hash rate in the last 24-hour and three-day periods were 59.58 EH/s and 59.70 EH/s, respectively, even higher than the average 56.77 EH/s from May 15 to June 27, or any 14-day data in the network’s history.
Similarly, data from blockchain also shows the aggregate of bitcoin computing power was around 66 EH/s as of June 22, surpassing last year’s record high of 61.86 EH/s tracked by the site, and has more than doubled since December 2018 when the hash rate dropped to as low as 31 EH/s amid bitcoin’s price fall.
Assuming all such additional computing power has come from more widely used equipment such as the AntMiner S9, which performs calculations at an average rate of 14 tera hashes per second (TH/s), that suggests more than 2 million units of mining equipment may have been switched on over the past several months. (1 EH/s equals to 1 million TH/s)
The increase in capacity is also in line with bitcoin’s price jump over the first half of 2019, which caused the price of second-hand mining equipment to double in China, and also juiced demand for new machines.
Further estimates the bitcoin mining difficulty will jump by another seven percent at the beginning of the next adjustment cycle, which would be the first time for bitcoin mining difficulty to cross the eight trillion threshold.
Delayed plugging in
Such computing interest comes at a time when mining farms in China, especially in the country’s mountainous southwest, have been gradually plugging in equipment as the rainy summer approaches.
According to a report published by blockchain research firm Coinshare, as of earlier this month, 50 percent of the global bitcoin computing power was located in China’s Sichuan province.
However, it’s important to note that this year, the arrival of the rainy season in China’s southwest has been delayed by nearly a month compared to previous years. As a result, some local mining farms were only running less than half of their total capacity in the past month.
Xun Zheng, CEO of mining farm operator Hashage based in Chengdu that owns several facilities across China’s southwestern provinces, said there had been no rain in the area for over 20 days since early May, which was “unusual.”
“In the past years, it usually starts raining continuously throughout May so [hydropower plants] normally will have enough water resources by early June,” he said.
As a result, in early June his firm was only operating at 40 percent of capacity; it can host more than 200,000 ASIC miners. But as the rain has arrived gradually over the past two weeks, the proportion has climbed to over 60 percent.
Mining farms in China previously estimated that the total hash rate this year during the peak of the rainy season around August could break the threshold of 70EH/s. That means another 300,000 units of mining machines could be further activated, assuming all are AntMiner S9s or similar models.
Those waiting to be switched on will also include new capital in the sector such as Shanghai-based Fundamental Labs, a blockchain fund that has invested $44 million on top-of-the-line mining equipment, which will be activated in June.
submitted by alifkhalil469 to BtcNewz [link] [comments]

Bitcoin Mining Power Hits New High as Half a Million New ASICs Go Online

Bitcoin Mining Power Hits New High as Half a Million New ASICs Go Online

News by Coindesk: Wolfie Zhao
The computing power dedicated to mining bitcoin has hit yet another new high, suggesting that more than 600,000 powerful new machines may have come online in the last three months.
According to data from crypto mining pool, bitcoin’s two-week average hash rate has crossed another major threshold, reaching 85 exahashes per second (EH/s) around 19:00 UTC last Friday. Meanwhile, mining difficulty also adjusted to a new record of nearly 12 trillion.
Notably, both figures have jumped 60 percent since June 14, the data shows.
Bitcoin’s mining difficulty — a measure of how hard it is to create a block of transactions — adjusts after 2,016 blocks, or roughly every two weeks. This is to ensure the time to produce a block remains around 10 minutes, even as the amount of hashing power, deployed by machines around the globe competing to win freshly minted bitcoins, fluctuates.
Several new models of application-specific integrated circuit (ASIC) miners hit the market over the summer, with an average hashing power around 55 tera hashes per second (TH/s).
Assuming all of the 35 EH/s of new hashing power added since mid-June came from these top-of-the-line models, a back-of-the-envelope calculation suggests that more than half a million such machines have connected to the bitcoin network. (1 EH/s =1 million TH/s)

Billion-dollar business?

These powerful ASIC miners, made by major manufacturers such as Bitmain, Canaan, InnoSilicon and MicroBT, are priced from $1,500 to $2,500 each. So if more than half a million of them were delivered, as estimated above, the leading miner makers could have made $1 billion in revenue over the past three months.
Bitcoin’s spiking hash rate and difficulty are in line with the soaring price since earlier this year, which led to increasing demand for mining equipment that has significantly outstripped supply. It’s also in part thanks to the rainy summer season in southwestern China which resulted in cheap, abundant hydroelectric power.
Further, there has also been a growing interest in Russia’s Eastern Siberia region, where the Brastsk hydropower station built in the Cold War era has been utilized to power mining farms that are estimated to account for almost 10 percent of the total computing power on the bitcoin network.
Miners in China estimated earlier this year that bitcoin’s average hash rate in the summer would break the level of 70 EH/s, which happened in August.
As such, major miner manufacturers have already sold out equipment that is due for shipment until the end of the year with customers placing pre-orders three months in advance.
TokenInsight, a startup that focuses on analysis of crypto trading and mining activities, said in a report published Friday that additional supplies of miners are expected to hit the market in the coming months.
“Following the drastic increase in bitcoin’s price, the bitcoin mining market saw significant inflation in Q2 2019. Most of the miners from various manufacturers were in serious shortage and pre-orders submitted in Q2 and Q3 are to be delivered by the end of the year,” the report states.
Therefore, the firm estimates mining difficulty will maintain its growth momentum to reach 15 trillion by the end of the year — with bitcoin’s average total hashing power crossing the threshold of 100 EH/s for the first time in its history.
Bitcoin mining facility image courtesy of Bcause
submitted by GTE_IO to u/GTE_IO [link] [comments]

Asicpower AP9-SHA256 Review

Asicpower AP9-SHA256 Review

Bitmain is regarded as one of the most influential companies in the ASIC mining industry. It is estimated that they have manufactured approximately 53% of all mining equipment.Without including their mining profits, that’s around $140 million dollars in sales. These figures are staggering, but Bitmain’s monopoly of the Bitcoin ASIC market may come to an end, following the release of PowerAsic’s asicpower AP9-SHA256.

About the asicpower AP9-SHA256

Designed with brand new technology and boasting 94 TH/s per miner, the AP(-SHA256 is the most powerful and efficient Bitcoin miner to date.PowerAsic claims they spent $12 million dollars on research, development, and prototypes.PowerAsic also noted that their miners take advantage of ASICBOOST, an exploit of Bitcoin’s algorithm which improves mining efficiency by 20%.An unusual approach separate Powerasic’s miner to the other manufactures is the implementation of copper heat-sink claimed to have a superior thermal conductivity 69% better than aluminium. Don’t take their words for it but confirm the facts are correct on widely well known and published science documents as this one.The first batch of miners were announced and made available for order in August of 2019, with start scheduled for shipment in September, 2019.
Powerasic claims that the machines are around 40 percent more productive than the most proficient ASIC on the market, Bitmain’s Antminer S17.According to PowerAsic, they started a mining project with the aim to bring much needed competition to the market…We want to ‘make SHA256 great again.Sitting at the hefty price of $2,795.00, the powerasic AP9-SHA256 is far from affordable for the average person. Fortunately, due to the newly born rivalry between Bitmain and Powerasic, the price will probably lower with time and competition.The power supply for this unit is included and integrated in the top-box also including the controler card as a one unit. You will also get standard power cable, network cable, manual and software in the packet. In comparison to the price of the Antminer S17 , the Powerasic AP9-Sha256 is a better value.

Power Supply

The integrated PSU 3300W has a inputVoltage 220V 50Hz 30A. There are 2 fan 40mm., 1 fan 60mm to keep it cool and the power cable 3 legs following CEE 7 standard.Professional mining hardware runs optimally at 220-240V, hence why mining farms step down their own electricity supply to 220-240V. Note that 220V current is only found outside of the US – American outlets are 110V by default. Unless you want to hire an electrician, this could cause some people trouble adapt to the eficient and recomended 220V power needed, still 110V will get the job done, but they are not ideal for optimum mining performance.

Power Consumption

Thanks to the powerasic AP9-HA256’s new 7nm generation of ASIC chips, the AP9-SHA256 has become the most electrically-efficient miner on the market.Consuming merely 30.J/TB, or 2860W from the wall, the 16T is 30% more electrically-efficient than the Antminer S17.


Powerasic ’s new ASIC technology is impressive. When compared to its closest competitor, the Antminer S17, the powerasic AP9-HA256 is the clear winner. It hashes at 94 TH/s, as opposed to the S17’s 56 TH/s. Moreover, the the AP9-HA256 consumes 30J/GH, whereas the S17 consumes 39-45J/TB.The difference in power consumption is miniscule, but when it comes to large-scale mining, the the AP9-HA256’s edge will drastically increase the profitability of a mining operation. This ASIC is profitable not only for mining on a large scale, but for the individual miner as well.Take a look at the projected mining profitability of a single miner:Note that is appears profitable even with high electricity costs ($0.1 per KW/h). With $0.05 / KW/h it’s even more profitable:📷Each powerasic AP9-HA256 will generate about $6,009 per year (calculated with 1 BTC=$10,141.5). Mining profitability may vary. You can usethis free profitability calculator to determine your projected earnings.

Is powerasic AP9-HA256 a Scam?

There is been a lot of talk on Twitter that powerasic AP9-HA256 is a scam. It appears it is not, as many users are already claiming to have received their miners.Slush, the creator ot Slush Mining Pool and the TREZOR hardware wallet, claims on Twitter that he has seen units and knows people who have had their miners delivered:

Verdict: Is The Antminer S17 Outdated?

When the first batch of Bitmain’s Antminer S17 ASICs reached the eager hands of miners, they were all the rage. The S17 was renowned as the most efficient ASIC miner on the market. Many used the S17 as the industry’s golden standard.Up until the launch of the powerasic AP9-HA256, it was the golden standard.But, now?Things have changed.Not only is the powerasic AP9-HA256 more powerful than its predecessor from Bitmain, but also more efficient, and therefore, more profitable.Ever since the announcement of the new ASIC, there was widespread speculation of its legitimacy – and rightly so.The Bitcoin community has been plagued with small, phony companies manipulating images of preexisting antminers as a ploy to hype up their fake products. Nevertheless, powerasic AP9-HA256 is taking things seriously, and their first batch of miners have lived up to expectations.The fact of the matter is, Bitmain’s most powerful and efficient antminer has been dethroned by the new reigning king of ASICs: The powerasic AP9-HA256.


Bitmain has dominated the ASIC market since its inception in 2013.There are a few other companies producing ASICs. However, before the creation of PowerAsics AP9-SHA256., Bitmain was the only company with a proven track record that sold efficient miners directly to the public.Powerasic AP9-HA256 has the potential to bring Bitmain’s monopoly to an end. Powerasic AP9-HA256 has a bright future ahead of them. Now that Bitmain has noteworthy competition, it will be interesting to see how it affects the market. The powerasic AP9-HA256 is the best option (for now) for anyone getting started with mining. Powerasic’s innovation should force other ASIC producers to innovate and force other companies to release new miners with better efficiency. So whether you’re buying a miner now or soon, you’re likely to benefit from the development of this new miner. For more, Visit Us:
submitted by farwa786 to u/farwa786 [link] [comments] - How does the security of different Proof-of-Work blockchains compare to Bitcoin?
Original post in Bitcoin here:

How are these values calculated?

It's easy to compare blockchain hashrates when the Proof-of-Work algorithm is the same. For example if Bitcoin has a hashrate of SHA-256 @ 40 PH/s and Bitcoin Cash has a hashrate of SHA-256 @ 2 PH/s, it's easy to see that for a given period of time the Bitcoin blockchain will have 20x (40/2) the amount of work securing it than the Bitcoin Cash blockchain. Or to say that differently, you need to wait for 20x more Bitcoin Cash confirmations before an equivalent amount of work has been done compared to the Bitcoin blockchain. So 6 Bitcoin confirmations would be roughly equivalent to 120 Bitcoin Cash confirmations in the amount of work done.
However if the Proof-of-Work algorithms are different, how can we compare the hashrate? If we're comparing Bitcoin (SHA-256 @ 40 PH/s) against Litecoin (Scrypt @ 300 TH/s), the hashes aren't equal, one round of SHA-256 is not equivalent to one round of Scrypt.
What we really want to know is how much energy is being consumed to provide the current hash rate. Literal energy, as in joules or kilowatt hours. It would be great if we had a universal metric across blockchains like kWh/s to measure immutability.
However that's fairly hard to calculate, we need to know the average power consumption of the average device used to mine. For GPU/CPU mined Proof-of-Work algorithms this varies greatly. For ASIC mined Proof-of-Work algorithms it varies less, however it's likely that ASIC manufacturers are mining with next generation hardware long before the public is made aware of them, which we can't account for.
There's no automated way to get this data and no reliable data source to scrape it from. We'd need to manually research all mining hardware and collate the data ourself. And as soon as newer mining hardware comes out our results will be outdated.
Is there a simpler way to get an estimated amount of work per blockchain in a single metric we can use for comparisons?
Yeah, there is, we can use NiceHash prices to estimate the cost in $ to secure a blockchain for a given timeframe. This is directly comparable across blockchains and should be directly proportionate to kWh/s, because after all, the energy needs to be paid for in $.
How can we estimate this?
Now we have an estimated total Proof-of-Work metric measured in dollars per second ($/s).
The $/s metric may not be that accurate. Miners will mark up the cost when reselling on NiceHash and we're making the assumption that NiceHash supply is infinite. You can't actually rent 100% of Bitcoin's hashpower from NiceHash, there isn't enough supply.
However that's not really an issue for this metric, we aren't trying to calculate the theoretical cost to rent an additional 100% of the hashrate, we're trying to get a figure that allows us to compare the cost of the current total hashrate accross blockchains. Even if the exact $ value we end up with is not that accurate, it should still be proportionate to kWh/s. This means it's still an accurate metric to compare the difference in work done over a given amount of time between blockchains.
So how do we compare these values between blockchains?
Once we've done the above calculations and got a $/s cost for each blockchain, we just need to factor in the average block time and calculate the total $ cost for a given number of confirmations. Then see how much time is required on the other blockchain at it's $/s value to equal the total cost.
So to calculate how many Litecoin confirmations are equivalent to 6 Bitcoin confirmations we would do:
Therefore we can say that 240 Litecoin confirmations are roughly equal to 6 Bitcoin confirmations in total amount of work done.


$/s doesn't mean what it sounds like it means.

The $/s values should not be taken as literal costs.
For example:
This is does not mean you could do a 51% attack on Bitcoin and roll back 6 blocks for a cost of $360,000. An attack like that would be much more expensive.
The $/s value is a metric to compare the amount of work at the current hashrate between blockchains. It is not the same as the cost to add hashrate to the network.
When adding hashrate to a network the cost will not scale linearly with hashrate. It will jump suddenly at certain intervals.
For example, once you've used up the available hashrate on NiceHash you need to add the costs of purchasing ASICs, then once you've bought all the ASICs in the world, you'd need to add the costs of fabricating your own chips to keep increasing hashrate.

These metrics are measuring "work done", not security.

More "work done" doesn't necessarily mean "more security".
For example take the following two blockchains:
Bitcoin Cash has a higher $/s value than Zcash so we can deduce it has more "work done" over a given timeframe than Zcash. More kWh/s are required to secure it's blockchain. However does that really mean it's safer?
Zcash is the dominant blockchain for it's Proof-of-Work algorithm (Equihash). Whereas Bitcoin Cash isn't, it uses the same algorithm as Bitcoin. In fact just 5% of Bitcoin's hashrate is equivalent to all of Bitcoin Cash's hashrate.
This means the cost of a 51% attack against Bitcoin Cash could actually be much lower than a 51% attack against Zcash, even though you need to aquire more kWh/s of work, the cost to aquire those kWh/s will likely be lower.
To attack Bitcoin Cash you don't need to acquire any hardware, you just need to convince 5% of the Bitcoin hashrate to lend their SHA-256 hashpower to you.
To attack Zcash, you would likely need to fabricate your own Equihash ASICs, as almost all the Equihash mining hardware in the world is already securing Zcash.

Accurately calculating security is much more complicated.

These metrics give a good estimated value to compare the hashrate accross different Proof-of-Work blockchains.
However to calculate if a payment can be considered "finalised" involves many more variables.
You should factor in:
If the cryptocurrency doesn't dominate the Proof-of-Work it can be attacked more cheaply.
If the market cap or trading volume is really low, an attacker may crash the price of the currency before they can successfully double spend it and make a profit. Although that's more relevant in the context of exchanges rather than individuals accepting payments.
If the value of the transaction is low enough, it may cost more to double spend than an attacker would profit from the double spend.
Ultimately, once the cost of a double spend becomes higher than an attacker can expect to profit from the double spend, that is when a payment can probably be considered "finalised".
submitted by dyslexiccoder to CryptoCurrency [link] [comments]

How low could Bitcoin go before being 51% attacked

Assuming that bitcoin miners are mining at a loss below $6,000, they will shut their machines off at some point. Of course that is an average, and some people on solar power with battery backup, or geothermal, have a power cost of $0, so it would always be profitable to mine for them. So, as price declines, so will hash rate as miners shut down.
Will there ever be a price low enough that someone will successfully 51% attack Bitcoin?
According to hash rate calculators, the maximum hashrate bitcoin has ever seen is 62,000,000 TH ( Let's imagine that, including other miners, the world has 100,000,000 TH of machines capable of mining bitcoin. The lowest recent dip of hashrate was 35,000,000 TH due to price declines (and the Bitcoin cash forking debacle).
Theoretically under those conditions it would already be doable to have turned that 65,000,000 TH of Bitcoin hash on and done a doublespend attack, but Bitcoin isn't centralized enough for an attack to be mounted at that level, in my opinion. But we might get to 20,000,000TH (my guess), if the price of Bitcoin goes to $1,500, at which point I believe that a bad actor could/would do a double spend attack with their and possibly their corporate friends' hashing power.
So, my question is: Do you think that I'm right, that a low enough price will cause Bitcoin's hash rate to collapse and someone will successfully double spend attack it? If so, what price would you speculate it would happen at?
submitted by StrongCryptographer to Bitcoin [link] [comments]

What did I calculate wrong?

Alright, so I'm thinking about getting into mining Litecoin. I've never mined before, and sadly, my computer, even though it's great for gaming, just won't cut it because of ASIC computers. So I was looking at this one and it said the hash rate was 13.5 TH/s so I went to this website to see how much that would equate to in USD. It says I'd make more than $2 million every month, which I know is very very far off. But what did I do wrong to calculate it?
submitted by Ruben_Samich to CryptoCurrency [link] [comments]

07-15 10:43 - 'Bitcoin venture opportunity' (self.Bitcoin) by /u/dmoney3333 removed from /r/Bitcoin within 27-37min

So through my business I stumbled upon an opportunity for a data center with cheap electricity. The company's name is Astra [[link]2 and its located in Trail, BC, Canada. They are offering me this deal. So since I am a bitcoin novice, do you guy have any ideas where I could advertise this deal or who would be interested? The reason why the power is so cheap it's because of its located right next to a hydroelectric-dam. The numbers are calculated when the bitcoin price was at 7600 dollars. I have photos of the data centers, and the CEO will pick up if anyone has any questions. Any tips?
* We can offer 600 BTC miners (specs 1300 Watts Power, 12 TH/s Hashing power) for $ 275/ miner ($165k USD initial investment) - these are last years miners so they are heavily discounted
* For set up, there would be a one time fee of $25,000 USD
* For power, lease space and administration we would charge $10,000 / month
* Your power costs to run the machines would be approx. $43,000/ month (would vary slightly as power is paid in CDN dollars)
* Your return rate (i.e. value of Bitcoin produced at todays rate of $7,664.51 USD) would be $54,966 USD
* So - monthly revenue from your machines would be approx. $16,466 (before admin fee - $6,466 net) Admin fee is 10 k
* This would be turn key i.e. we would set up everything for you and provide reporting etc.
* Term would need to be 12 months to start then monthly with a 2 month notice period after initial term
Bitcoin venture opportunity
Go1dfish undelete link
unreddit undelete link
Author: dmoney3333
1: *s*ra.ear*h/ 2: as*ra.*art*/]*^1
Unknown links are censored to prevent spreading illicit content.
submitted by removalbot to removalbot [link] [comments]

Cybtc Review: Bitmain Antminer S15-28TH/s

Cybtc Review: Bitmain Antminer S15-28TH/s
Bitmain is a technology company specializing in high-speed, low-power custom chip design and development, successfully designed and produced a variety of ASIC custom chips and integrated systems. Bitmain was founded in 2013. In the same year, it launched the first generation bitcoin mining machine of the ant mining machine series - Antminer S1. After more than five years of development, the antminer series bitcoin mining machine passed S1, S2, S3, S4 Iterations of multiple models of S5, S7 and S9, the latest bitcoin mining models are S15 and T15, which will be sold on November 8, 2018.

The Antminer S15 adopts a new 7nm chip process. The official evaluation of the S15 is durable, energy saving. Emphasizing the characteristics of "high performance, more durable, and more power saving". From the officially announced parameters, the Antminer S15 is built in. Standard and low-power mining modes. The officially announced parameters have a unit-to-power ratio of 57J/T in standard mode, and the unit-to-power ratio of low-power mode has reached 50J/T. Compared to the products in the current market, in terms of Bitcoin miners, this unit power consumption ratio has set a new record.

Antminer S15 official parameters,

Recently, the Antminer S15 has sent to Cybtc for testing. Please see the third-party independent review by us.

I. Unpacking:

Because the Antminer S15 adopts a new all-in-one and parallel fan design, the packaging box has changed from the previous generations. The previous cuboid has changed into a square-like style. The packaging material is still packaged in an industrial carton, and the box is marked manufacturer information, logistics warehousing logo, mining machine specification model and strip identification code, outer box size: 486*388*265, weight about 8.7kg.

The interior of the two pieces of styrofoam is firmly packed in the box from the upper and lower sides to ensure the safety of the mining machine during transportation. There is also a gap around the pearl foam for easy access.

Take out the styrofoam on one side to see the main body of the mining machine. The mining machine is wrapped by an anti-electrostatic bag. Compared with the box, the mining machine looks very small and only takes up about half of the box space.

The Antminer S15 changed the style of single-tube with double cooling fans as S1-S9 models, and became a dual-fan parallel single-side air intake and adopted the integrated machine design of the mining machine + power supply. The whole machine size is 279*175*221mm, weight 7.13 kg.

The Antminer S15 is small and neat, the air inlet side and the mining machine interface side are on the same side, the fan is removed from the air outlet side, and a honeycomb-shaped baffle is used.

The advantage of the all-in-one design is that the wire connection is reduced. The appearance of the mining machine is more compact, and the use and operation and maintenance are more convenient. The connection between the Antminer S15 mining machine and the power supply uses a clip-connected design, and the controller and the power board are still connected by flat signal cable.

The nameplate of the mining machine body is marked with the model number, hash rate, and identification bar code. If the bottom part can increase the anti-slip mat, it is better to strengthen the stability of the mining machine when it is placed horizontally. The mining machine supports the erect and horizontal two ways. On the rack, the miner can choose the placement method according to the size of the mine rack.

II. Antminer S15 installation:

The design of the Antminer S15 all-in-one machine reduces the link of the power line of the plugging and unloading machine. As long as it is placed in the rack, plug in the power cable and the network cable to complete the hardware installation.

Find the mine IP address. Antminer S15 mining machine is automatically assigned IP mode, you can enter the local router to view the IP address named "antMiner".

Or use the ant official mining machine management software BitmainMinerTool to scan the IP address of the current mining machine. You can also use the management software to set the mining pool address and worker name, update the firmware, etc. When the number of mining machines is large, you can also use the mining machine. IP report button to find the IP address of the mining machine.

To view the real-time status of a single mining machine, you need to enter the mining machine control page. First, enter the mining machine IP into the control page home page, and then enter the default user name and password (the default is root) to enter the mining machine control page.

The new mining machine needs to modify the name of the mining pool and miners, click on the “Miner Configuration” page to modify the main mining pool address and worker name, and modify the two alternate mining pool addresses and miners' names as needed. Antminer S15 has built-in standard and low-power mining modes, so you can easily select any mode mining on this page according to your needs. After each setting is completed, click “Save&Apply” to save the settings and apply.

After saving, the miner will restart the mining procedure. After about a few minutes of normal operation of the mining machine, you can enter the mining operation interface “Miner Status” to check the operation of the mining machine, including running time, hash rate, Chip status, operating frequency, PCB board and chip temperature, fan speed and other parameters information.

III. Review:

The Antminer S15 has standard mining mode and low power consumption mode. Therefore, we tested the two modes for 24 hours respectively. The test environment temperature is about 17 degrees, and the noise value is around 36 decibels.

After the mining machine is turned on, the fan runs at full speed, the power consumption of the boot is about 25W and further increases slowly, and the noise level is up to 81.2 dB.

Standard mode test

Power consumption: The miner's chip is fully operational, and the control page power is 28T. The measured power consumption of the miner is 1610-1620W, which is in line with the officially announced 1596W ±7% level.

Noise: Due to the low ambient temperature, the number of fan rotations is basically stable at around 3120 rpm. The noise value of the operating environment is measured to be 76.5 decibels. The distance of the mine is 27.7 meters, and the noise level is properly controlled.

Temperature: Antminer S15 has a total of four mining boards. There are four temperature-sensing modules distributed on each calculation board. The chip temperature is at least 44 degrees and the highest is 78 degrees. Thanks to the Exposed Die package, the outlet temperature is about 42 degrees. The power outlet temperature is about 28 degrees.

Because the Antminer S15 adopts the one-piece design, We also test the contact temperature of the power supply and the mining machine's power board. It can be clearly seen that the temperature values ​​of each point are different.

Hash rate: After 24 hours test in the mining pool, the average hash rate of the Antminer S15 in 24 hours was 28.56 TH/s. Thus calculate the unit energy efficiency ratio = 1620W / 28.56 ≈ 56.72W / T, and the official published data 57 J / T consistent.

Low power mode test

Power consumption: After checking the option behind “Low Power Mode” on the Antminer S15 Pool Settings page and saving the application, the miner can run in low power mode. After the power of the mining machine control page reaches 17T, the measured power consumption is up to 836.6W, and the running data meets the official data of 775W ±7% - 900W ±7%.

Noise: As the power and power consumption are reduced, the fan speed is basically stable at around 2400 rpm, the measured operating environment noise value is 77 decibels, and the distance measured by the mining machine is about 66 decibels at a distance of 2 meters. The noise level and the standard mode. At the same level.

Temperature: The four mining board chips have a minimum temperature of 25 degrees and a maximum of 62 degrees. The outlet temperature is about 30 degrees, which is slightly lower than the standard mode. The temperature of the power outlet is about 20 degrees.

Contact point temperature value between the power supply and mining machine mining board.

Hash rate: After 24 hours of testing in the mine, the average 24-hour power was measured at 17.5TH/S. Thus calculate the unit energy efficiency ratio = 836.6W / 17.5 ≈ 47.8W / T, lower than the official published data 50 J / T.

IV. Summary:

Two built-in mining modes. The power consumption per unit of power in low-power mode is lower than 50W/T, which is better. The lower the power consumption ratio, the lower the price of the shutdown.
One machine design reduces the wire, beautiful and convenient.
Exposed Die package improves heat dissipation, increasing the number of chips per unit volume and reducing heat sinks, reducing overall weight.
The new AWP8 power supply is used, easy to assemble and disassemble.
The machine noise is lower and the temperature is lower than other mining machines.
The calculation power of the whole machine is stable and fluctuating.

Finally, exposed power connectors may cause problems if touch the iron on the shelf. Maybe it can have improvement.

The Antminer series mining machine has evolved from S1 to S15, and the computing power has evolved from S180's 180G/360W to S15's 28000G/1600W. This is not just a digital evolution, but also the ups and downs of the Bitcoin industry. The mining machine is upgrading. Bitcoin is advancing, leaving many stories in the chain, the currency circle and the mining ring than the ten-year journey of holding the currency. In the two-year life cycle of S9, S9's bitcoin mining machine market share is far ahead, and currently in the market background of the rising bitcoin computing power, the depressed bear market and more new mining machines, Whether the ant S15 can create a new benchmark for the bitcoin mining machine, time will give us the answer.

More miner and crypto reviews on:

submitted by cybtc to BitcoinMining [link] [comments]

Bitcoin Hash Rate Hits New All-Time-High

Bitcoin Hash Rate Hits New All-Time-High
The Bitcoin (BTC) hash rate reached a new all-time high today, according to data from monitoring resource on July 7.
The previous record was broken in the second half of June, when bitcoin’s hashrate reached 65.19 TH/s and growth has steadily continued since then.
Hash rate is the number of calculations that a given hardware or network can perform every second. It is a very important parameter for miners, as a higher hash rate will increase their chances of solving the mathematical problem, sealing off the block and collecting their reward. A higher network hashrate also increases the amount of resources needed for performing a 51% attack, making the network safer.
Increases in the network’s hash rate also often mean that its energy consumption increases. Still, cryptocurrency investment products and research firm CoinShares recently estimated that 74.1% of bitcoin mining is powered by renewable energy.
As Cointelegraph previously reported, the period after September 2018 — during the so-called “crypto winter” — proved to be a retrograde step for the bitcoin network. At the time, the network’s hashrate decreased for the first time ever.
In June news broke that bitcoin’s mining difficulty has reached an all-time high, demonstrating the increasing competition for block rewards between miners.
submitted by Rajladumor1 to omgfin [link] [comments]

How much would I have to spend to profitably mine bitcoin?

Currently (Nov. 28th 2017.) annual net earnings just with one Antminer s9 in Serbia is 8.986 USD.
As an investor or small/middle size miner you should consider: the price of bitcoin, investment for mining equipment and the price of electricity.
Superb mining equipment are ASIC processors specially made for bitcoin and alternative (all other) coins mining.
Currently (Nov. 2017.) for mining the bitcoin the best ASIK processor in the world is Antminer s9. It cost from $1.500 up to $3.500. The price varies depending on the series (each subsequent series has better performance), where it is bought (it's a big difference if you buy it directly from the manufacturer or via eBay or Amazon), shipping costs (can be from $0-200) and power supply unit cost from $105 to $200.
The cheapest electricity in Europe is in Serbia. 0,065 € (≈0,077 USD)
Source: Eurostat._YB16.png) (Eurostat is a statistical office of the European Union located in Luxembourg).
One of the essential heritage of communism that has remained in Serbia is that the price of electricity is a social category. So, in Serbia, unlike the rest of the world (perhaps in the communist countries), it is a cheaper electrical cost for domestic households than for the industry.
I decided to pinpoint exactly how much it would electricity cost if 2 Antminers s9 were mining 24/7 365 days a year. The calculation is based on Serbian Dinars. The final value is in US Dollars.
In Serbia, there are 3 zones of electricity categories depending how much of power do you consume per 30 days accounting period: green (0-350 KWh) blue (351 KWh-1.600 KWh) and red zone (more than 1.600KWh). Each zone has own price range. Each zone has night ( lower) and day ( higher) price. Night prices are calculated from 11pm-6am for each zone. Meaning, 16 hours (66,66%) during a day processor will consume higher priced and 8 hours ( 33,33%) lower priced
One Antminer s9 processor consumes 1.400W = 1,4 KW x 24h = 33,6KW / h consumed in one day.
So two processors consume 67,2 KW / h / day
Green zone is up to 350 KWh. So, 350 KWh: 67,2 KWh / per day = 5,2083 days
5,2083 days x 24h = 124,9992 h.
33,33% of 124,9992 h = 41,6622h (lower price hours) x 1,419din. (lower price of el. in the green zone) = 59,1187 din.
66,66% of 124,9992 h = 83,3244 h (higher price hours) x 5,962din. (higher price of el. in green zone) = 496,7804 din.
The blue zone is from 350 KW to 1.600KW
1.600 KW-350 KW = 1.250 KW (the amount of electricity that can be spent in the blue zone price range)
1250KW: 67,2 KWh / per day = 18,6011 days
18,6011 days x 24h = 446,4264 h.
33,33% of 446,4264 h = 148,7939 h (lower price hours) x 2,236din. (lower price of el.price in blue zone) = 332,7032 din.
66,66% of 446,4264 h = 297,5878 h (higher price hours) x 8,943din.(higher price of el.price in blue zone) = 2.661,3280 din.
Red Zone
It remains 6,2 days in the red zone
The number of days spent in the green zone is 5,2
The number of days spent in the blue zone is 18,6
23,8 days spent
Calculation period 30 days -23,8 = 6,2 days in the red zone
6,2 x 24h = 148,8h
33,33% of 148,8h = 49,5950h (lower price hours) x 4,472din. (lower price of el. coast in the red zone) = 221,7890 din.
66,66% of 148,8h = 98,208h (higher priced hours) x 17,887din. (higher price of el.cost in the red zone) = 1.756,6464 din.
…………In total: 5.528,3657 dinars( basic amount for tax calculation)…………….
Tax calculation
Note: Some tax I can't translate literary or it is to long for translation, so I have named them Fixed Tax
-Basic amount: ……………………………………......... 5.528,3657 din.
-Fixed Tax : 11,04 KW x 48,552 din.: …………...+ 536,01 din.
-Fixed Tax: …………………………………………........... + 132,76 din.
-Total: …………………………………………..........….…… 6.197,1357 din.
-5% discount on regularity of payment: .....… - 309,8567 din.
-Total: ……………………………………………….........…. 5.887,279 din.
-Tax for green energy: …………………….....……… + 187,48 din.
-Total: ……………………………………………........……. 6.074,767 din.
-Excise (7,5%): ……………………………….....……… +455,6075 din.
-Total: …………………………………………….........…… 6.530,3745 din.
-VAT (20%): ………………………………….....……… +1.306,0749 din.
-Total: …………………………………………….........…… 7.836,4494 din.
-Nacional Television Tax: ………….......…………….. 150,00 din.
……… Grand total: 7.986,4494 din. ≈79,45 $ …………………………….
The exact price KWh for a given period is only 3,9615 din. ≈ 0,039 $
Official National Bank of Serbia exchange rate for Nov. 28th, 2017.
7.986,4494 din : 2.016KWh (total el. power consumption for 30 days) = 3,9615 din. ≈$0,039 per kilowatt/hour. In this way, it is actually cheaper than the average price in China, India or UAE. I'll never complain again about el.price in my country. Worldwide electricity price by region, source:
The profitability of mining bitcoin ( and other altcoins) is calculated with the power consumption calculator. Simply, chose the coin ( in this case bitcoin) enter the hash power of processor ( in this case 14 TH) and el. coast ( in this case 0,039 USD). When you put all this data, you are making just with 1 Antminer s9 $8,986 in Serbia. Power consumption calculator. Source:
Now we can do a little investment brainstorming.
Let's say you rent 10 apartments and in each, you will put two S9s. Rent in Serbia (not in Belgrade) for a flat on less attractive location, is $ 110 (can be even less), x 10 apartments that will cost you $1.100 a month.
The Internet per month is $12 x 10 flats = $120
Electricity per month is $79,45 x 10 flats = $794,5
Since this is a serious investment and business, you need 3 people (8 hours shift) for monitoring the processors pay the bills preventing possible stilling, just to make sure everything goes smoothly. The salary per person is $300, so monthly is $900. For these three persons, you can rent an apartment from where they will monitor the processors, which is an additional $ 200 per month (maybe even less).
Monthly expenses are 3.114,5 $
2 Antminers s9 are making (with current bitcoin mining difficulty, block size and price rate) $1.477,3 x 10 flats = $14.773 per month
Month Net Profit: $11.658,5 x 12 months = $139.902 Annual Net Profit
The variable cost is purchasing price of Antminer s9. From $ 1.500 to $ 3.500 (customs, delivery charges, where do you bay). We need 20 Antminers x $3.500 = $70.000
In a year (at the current bitcoin price) the gross profit is $139.902 - $70.000 ( purchasing price for 20 Antminer s9) = Net profit: $ 69.902 in the first year.
The costs could be further reduced:
~~ If you pay in advance ( 6 months or 1 year ) rant
~~ The price of an Antminer s9 is cheaper in a larger quantity order,
~~ I am not sure but, I spouse you can have better price from internet provider for large internet packet
Why two Antminers s9? Under the law, EPS ( Serbian state electrical company) is required to provide up to 30.000KWh annually to each household. The two Antminers S9 spend 24.192KWh yearly.
…..and there is more to talk about this subject.
So, if you have someone in Serbia I wish you all the best. Call me for dinner ( at least you owe me that :)) .
Or, if you are interested in this and you don’t have contacts in Serbia, you can contact me about this project. [email protected]
Stay happy,
submitted by _TETRISMANIA to BitcoinMining [link] [comments]

I've been working on a bot for crypto subs like /r/bitcoin for a few days now. Say hello to crypto_bot!

Hey guys, I've been working on crypto_bot for some time now. It provides a bunch of features that I hope will enhance your experience on /bitcoin (and any other subreddit). You can call it by mentioning it in a comment. I started working on this a few days ago. I'm constantly adding new features and will update this post when I do, but if you're interested I'll post all updates and some tips at /crypto_bot. Please either comment here, message me, or post there if you'd like to report a bug, request a feature, or offer feedback. There's also one hidden command :)
You can call multiple commands in one comment. Here's a description of the commands you can use:

Market Data:

Responds with the USD price of one bitcoin from an average of six of the top bitcoin exchanges (BTC-E, Bitstamp, Bitfinex, Coinbase, Kraken, Cryptsy).
crypto_bot ticker 
Responds with the USD price of one bitcoin at seven exchanges (all of the ones listed above, plus LocalBitcoins). Also lists the average at the bottom.
crypto_bot [exchange] 
Responds with the USD price of one bitcoin from [exchange] (any of the seven listed above).
crypto_bot [litecoin|ltc|dogecoin|doge] 
Responds with the USD price of one litecoin, or the price of 1 doge and 1,000 doge.
crypto_bot litecoin|ltc [exchange] 
Responds with the USD price of one litecoin from BTC-E, Bitfinex, Kraken, or Cryptsy.
crypto_bot [currency] 
Responds with the price of one bitcoin in the specified currency. Available currencies (symbols): JPY, CNY, SGD, HKD, CAD, NZD, AUD, CLP, GBP, DKK, SEK, ISK, CHF, BRL, EUR, RUB, PLN, THB, KRW, TWD.


crypto_bot [about|info] [arg] 
Responds with a short description about [arg], as well as a link to an external site (Wikipedia,, and some others) for more information. You can list multiple arguments and get a description for each. Available arguments: bitcoin, block chain, transaction, address, genesis, satoshi, mining, confirmation, coinbase, gox, cold wallet, hot wallet.
crypto_bot legal 
Responds with a chart about the legality of bitcoin in 40 countries, copied straight from Wikipedia.
crypto_bot [explain transaction delay|explain tx delay] 
Responds with an explanation of why transactions may take longer to confirm (the bot specifically discusses spam-transaction attacks in this command).

Network information/tools:

crypto_bot difficulty 
Responds with the current difficulty of the bitcoin network.
crypto_bot [height|number of blocks] 
Responds with the current height of the block chain.
crypto_bot retarget 
Responds with what block the difficulty will recalculate at, as well as how many blocks until the network reaches that block.
crypto_bot [unconfirmed transactions|unconfirmed tx] 
Responds with the current number of unconfirmed transactions.
crypto_bot [new address|generate address] 
Responds with a newly-generated public and private key. This is mainly to provide an explanation of what both look like, and contains a clear warning to not use or send bitcoins to the address.
crypto_bot blockinfo [height] 
Responds with information about block #[height], including its hash, time discovered, and number of transactions.
crypto_bot [address] 
Responds with information about [address], including its balance and number of transactions.
crypto_bot [transaction_id] 
Responds with information about [transaction_id], including what block it was included in, its size, and its inputs and outputs.


crypto_bot calc <# miningspeed> [#][w] [#][kwh] [#][difficulty] [hc$#] [$#] [#%] 
Responds with calculations and information about how a miner would do with the above data (mining calculator). The only required field is mining speed. Order of the arguments does not matter. Everything other than hashrate defaults to the following if not given: w (watts): 0, kwh ($kilowatt cost/hour): 0, difficulty: current network difficulty, hc$ (hardware cost): $0, $: current bitcoin price in usd (according to Coinbase), % (pool fee): 0. The calculator does not account for nor allow for input of the increase/decrease of difficulty over time, though I may add this feature soon. Working hashing speeds: h/s, kh/s, mh/s, gh/s, th/s, ph/s.
Example usage: "crypto_bot calc 30th/s 10w .12kwh hc$55 1.5%" (to make it easier to remember, th/s can also be inputted as ths). This calls the bot with a hashrate of 30 th/s, electricity usage of 10w, a cost of $.12 kWh, a hardware cost of $55, and a pool fee of 1.5%.
crypto_bot number of btc <$amount to convert> [bp$bitcoin price] 
Responds with the number of bitcoins you could buy with <$amount to convert>. If the comment specifies a [bp$bitcoin price], it calculates it with that exchange rate. Otherwise, it uses the rate from Coinbase.
Example usage: "crypto_bot $419.29 bp$180.32" This calculates how many bitcoins you can buy if you have $419.29 and the bitcoin exchange rate is $180.32.


SignMessage! "" 
Signs a message in the bitcoin block chain in a transaction using OP_RETURN. The message must be less than 40 characters.
Example usage: "SignMessage! "Post messages in the block chain!""
I hope you find this bot useful! Again, if you have any questions or comments, please either comment on this post, message me, or post on /crypto_bot.
Update 1 (June 24, 2015, 17:35): The bot now responds with information if you post a link to a block, transaction, or address on in a comment, even if you don't call it. For example, if I wrote "" in a comment, it would respond with information about block #362,377.
Update 2 (July 10, 2015, 1:59): The bot now has two additional commands: "unconfirmed transactions" (or "unconfirmed tx") and "explain transaction delay" (or "explain tx delay"). The first command responds with the number of unconfirmed transactions, and the second explains why transactions might take extra time to confirm.
Update 3 (August 24, 2015, 1:34): The bot now responds in a better way than before when transaction ids or addresses are posted. Before, it only responded when the transaction id or address was used in a link to Now the bot will respond whenever a transaction id or address is posted at all; a link to is no longer necessary.
Update 4 (August 27, 2015, 3:00): The bot can now sign messages in the Bitcoin block chain using OP_RETURN.
submitted by busterroni to Bitcoin [link] [comments]

PSA: Hashflare isn't as profitable as it seems like it is

For example, if you purchase 1 TH/S of hash rate, in one year, you'll only profit ~$10. This is because of the maintenance fee of $0.0035 per 10 GH/S, and also the increasing difficulty of mining.
The recurring cost of $10.85 per month is because of the maintenance fee. $0.0035 * 100 = $0.35 per day. $0.35 * 31 Days = 10.85 per month
submitted by Eduguy1 to hashflare [link] [comments]

Probability in Bitcoin Mining: The Hashing Function Blockchain tutorial 3: Hash Bitcoin - Cryptographic hash function Cloud Mining 2020 App Bitcoin ETHEREUM LiteCoin Dash 2 years Contract + Referral To find previous hash of a given bitcoin block

The Bitcoin hashrate is number of possible solutions (hashes) being generated per second. As of January 2020, the Bitcoin hashrate peaked at 131 EH/s. Bitcoin mining also generates new Bitcoin. When a Bitcoin miner finds the correct hash to solve the next Bitcoin block, the miner is rewarded with Bitcoin. Find out what your expected return is depending on your hash rate and electricity cost. Find out if it's profitable to mine Bitcoin, Ethereum, Litecoin, DASH or Monero. Do you think you've got what it takes to join the tough world of cryptocurrency mining? Bitcoin Mining Calculator. Got your shiny new ASIC miner? Wondering when it will pay off? If you enter your hash rate below, this page will calculate your expected earnings in both Bitcoins and dollars over various time periods (day, week, and month). With Bitcoin Cloud Mining Calculator determine Bitcoin mining profitability and to find out the Productivity required. The figures may vary with changing hash rates. Call or drop an email at [email protected] Stats Now AVG 1H AVG 3H AVG 6H AVG 12H AVG 24H AVG 48H AVG 72H; Difficulty : 0: 0: 0: 0: 0: 0: 0: 0: Network Hashrate : 0: 0: 0: 0: 0: 0: 0: 0: Net Hash : 0 h/s 0 h/s 0 h/s 0 h/s 0 h/s 0 h/s

[index] [13859] [3917] [4870] [12727] [25788] [29965] [20152] [6370] [9582] [30788]

Probability in Bitcoin Mining: The Hashing Function

The word “hash rate” is often heard when trading virtual currencies. If you want to trade Bitcoin (BTC), this is a word you should definitely remember, but many people do not know what it means. Bitcoin Cloud mining - mine Bitcoins easy way Minar Bitcoin/Ethereum en la nube desde Hashflare Bitcoin Exchange and Bitcoin Mining for any cryptocurrency HashFlare Offers Top-Notch Cloud Mining ... Bitcoin released as open source software in 2009 is a cryptocurrency invented by Satoshi Nakamoto (unidentified person or group of persons). ... Hash Tables and Hash Functions - Duration: 13:54 ... hash rate definition hash rate calculator gpu hash rate of graphics cards HashOcean How to setup, fund and get started making money HashOcean calculator HashOcean bitcoin HashOcean cloud mining ... You can see dashboard and hash calculator introducing 100usd on each crypto for 2years contract. ... Cloud Mining 2020 App 📲💻 Bitcoin ETHEREUM LiteCoin Dash 2 years Contract ...

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