Antbleed: Massive Bitcoin backdoor could knock out 'at least half' of global hashing powerThe easily-accessible security flaw affects cyrptocurrency-mining equipment from Bitmain.Updated April 27, 2017 12:42 BST A major security flaw affecting Bitcoin mining equipment from Bitmain has the potential to knock out more than half of the global Bitcoin network's hashing power, according to reports.Called Antbleed, the backdoor allows for the remote shutdown of Bitmain's Antminer equipment including its S9, T9 and R4 platforms.More worrying is that the backdoor code can be found openly online, including on Pastebin and GitHub, and was described as "stupidly simple" by a source speaking to Bitcoin Magazine who tested the flaw on Antminer hardware.Antbleed works as such: every one to 11 minutes, Antminer checks-in to a central server owned by Bitmain and hands over the equipment's serial number, MAC address and IP address.Bitmain's server then sends a message back, which is usually ''true''.However, if the response is ''false'', the code instructs the Antminer machine to stop mining.

With Bitmain taking up the majority of the global bitcoin mining equipment market, it's estimated that the backdoor could shut down up to 70% of all cryptocurrency mining hardware and with it a sizeable chunk of the global hash rate."It'snot a stretch to attribute at least half of all hash power to the vulnerable machines," reported Bitcoin Magazine.Given that Bitmain collects personally-identifiable information, Antbleed could also be used to target specific machines and users "with the push of the button".bitcoin hacker caughtThe connection between Antminer machines and Bitmain isn't authenticated either, leaving it vulnerable to hijacking by hackers or other third parties.An information website about the Antbleed backdoor offers information on how users can secure their Antminer equipment until a patch is released by Bitmain.Bitmain, which is believed to have introduced the backdoor in July 2016, said in a statement: "The code running on the machines is open source, everyone can review it so no secret features exist in it.giá bitcoin so với đồng usd

The code that was pointed out is a feature to allow owners of the Antminers to be able to remotely control their miners."Itis not a secret and it does not provide any kind of remote control to Bitmain for the Antminers it does not own or operate in its own mining farms."Bitcoin Profitability Calculator – BTC Mining Profit Calculator Enter your set up information in the form below.Do not enter commas, only dots for decimal separator.Bitcoin difficulty Bitcoins per Block (BTC/block) Conversion rate (USD/BTC) Hash rate TH/s GH/s MH/s Electricity rate (USD/kWh) Power consumption (W) Time frame (months) Cost of mining hardware (USD) Profitability decline per year Nothing guaranteed, of course this is only a rough estimate!bitcoin miner software cpuYou can also calculate rented mining by setting “Power consumption” to 0 and “Cost of mining hardware” to the rent per time frame.bitcoin bomb threat

Default values are for a system of four 6870s.Estimate Strategy Extrapolating bitcoin difficulty or price is pure voodoo.It is much easier to predict the relationship of the two parameters in form of the Mining Factor.The Mining Factor 100 is the value in USD of the bitcoins you can generate if you let a 100MHash/s miner run for 24 hours.If the Mining Factor 100 rises above $2 or so everybody buys mining equipment and thus increases difficulty.If it falls people will stop mining eventually.bitcoin wealth transferThe estimate starts with the current Mining Factor and decreases it exponentially such that the decrease accounts for the factor decline per year.bitcoin armory safePlease note that a profit/loss by holding the coins is not accounted for in this estimate.bitcoin dice mobile

Things to consider that might eat into your profit: The values above are only a snapshot.The network and markets are moving quickly.Check out these diagrams to get a feeling for it.Looks like if your mining operation is not profitable now, it probably will not be in the future.With rising bitcoin exchange rates it might be more profitable to buy bitcoins than to mine.There are spreadsheets available in this thread or this one (with some FPGA data) for a more custom calculation.bitcoin richestBitcoin exchanges: LocalBitcoins, BitQuick.bitcoin singapore miningThe calculation is based on average block generation time.The closer the average generation time is to the time frame the more the resulting revenue depends on luck.You will have to pay mining pool fees from close to nothing up to 3% depending on the pool.Unless you want to do pool hopping you should go to a pool with hopping protection.

I recommend Arsbitcoin and EclipseMC (with namecoin merged mining).P2Pool is a new completely decentralized alternative.You will get somewhere from 1% to 3% of “stale shares”.The Bitcoin block mining reward halves every 210,000 blocks, the coin reward will decrease from 25 to 12.5 coins; Reward-Drop ETA date: 09 Jul 2016.This might partly be compensated by falling difficulty, raising prices, higher transfer fees, etc. A mining computer generates a lot of heat as a byproduct.This can impact your heating/airconditioning costs depending on outside temperatures.Other byproducts could be noise and an angry wife.Do you have lots of experience with and like working with computers during lonesome nights?You have to spend quite some time to set up the system (easily several days!)You will not get a 100% uptime.You will probably not be able to reach the highest values in the Mining Hardware Comparison.Some bragging / measuring error and extensive overclocking of the cards is involved here.