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Sensitive information is stored on the blockchain rather than large data centers, and is cryptographically secured. Bitcoin mining is competitive. Buy a sufficient amount of cooling fans to keep your hardware working. Choose your language. This limits the placement of the unit and somewhat reduces its safety. Unfortunately, Bitcoin is no longer as decentralized as it was once intended to be. Additionally, the T16 is remarkably power efficient, consuming a mere 0. Watch Queue Queue. Nicehash equihash pool address nicehash slushpool config Premium. The S5 will draw between to Watts at around Volts. Tumble coins coinbase bitcoin article cnbc you want bitcoins then you are better off buying bitcoins. As the deadline crept up, the world patiently waited for the much anticipated release. One upside of the plastic casing is that the unit only weight 2. In order to see any bitcoins from a single S5, you will need to join a Pool. In the beginning, CPU s were used to solve cryptographic hash functionsuntil miners discovered that GPU s were far better equipped for mining. Playstation 3.

What is an ASIC Bitcoin Miner?

Our calculator is more accurate than most others because ours assumes the 0. With careful tweaking, it may be possible to profit from an S7 even at 15c power. To improve your efficiency, there are also companies that will let you order hardware to their warehouse and run the miners for you. Aim for value. There are ways, ranging from simple to extreme, to manage the overclocking burdens. According to Bitcoin Magazine, BtcDrak remarked:. Backup generators — You may want generators as a backup in case your main source of electricity goes down. Nowadays, a large majority of Bitcoin mining takes place in China where electricity is cheap. This has been the average daily increase over the past 6 months. Upon creation, Bitcoin blocks were confirmed by the average person using their desktop — once ASICs hit the market, things changed. There are also Bitcoin hardware wallets like the Ledger Nano S , which secure bitcoins. While more expensive, the Antminer S7 and Antminer S9 or even the R4 both offer much more efficiency. If Halong Mining really did produce the most efficient SHA miner to date, the startup would prove their skeptics wrong and dethrone Bitmain, a company only concerned with their monopoly on the market. Corsair has a good reputation among Bitcoin miners and other tech enthusiasts for building reliable hardware. Be sure to take electricity costs into account. What do you get when you combine power and efficiency? ASIC developers, including Bitmain, granted early access to large mining cartels rather than the average person.

Halong Mining has earned their keep, finally viewed as a reputable company after months of speculation and debate. The major drawback is its relative inefficiency. Skip navigation. This feature is not available right. The units will automatically begin hashing upon powering up, which can be helpful in the event of power failure. The S7-LN also excludes a cord. Loading more suggestions Buy Antminer S5 on eBay. The same calculations adjusted for the Hash Rate and Power consumption of the S7-LN produces slightly more encouraging results:. Buy a sufficient amount of cooling fans to keep your hardware working. Just Want Bitcoins? What is the best power supply for a mining rig? JayzTwoCentsviews. Since miners use a large get your bitcoin wallet decentralized definition cryptocurrency of electricity, you want to buy one that converts the most amount of electricity into bitcoins. Power Supply — Bitcoin rigs need special power supplies to funnel and use electricity efficiently. Bitcoin mining is competitive. Best Bitcoin Mining Pools. Before you buy an Antminer S7 make sure you already have Bitcoin mining software and a Bitcoin mining pool.

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It does, however, plugin to your computer via USB. The strong metal casing features a tongue and groove system which allows for the neat arrangement of multiple miners. You can use a bitcoin mining profitability calculator to determine your estimated cost of return on your mining hardware. You can find Bitcoin mining equipment for sale on eBay and Amazon. Hash rate — How many hashes per second can the Bitcoin miner make? Since miners use a large amount of electricity, you want to buy one that converts the most amount of electricity into bitcoins. Before you buy an Antminer S5 make sure you already have Bitcoin mining software and a Bitcoin mining pool. The plus side is it works as a wireless router, so you can do some mining while providing internet for all your devices. Cancel Unsubscribe. We recommend purchasing the Dragonmint or the Antminer S9. VoskCoin 31, views.

Take a look at the projected mining profitability of a single Dragonmint:. Nowadays all serious Bitcoin mining is performed on dedicated Bitcoin mining hardware ASICs, usually in thermally-regulated data-centers with low-cost electricity. The interactive transcript could not be loaded. Avalon Does gpu memory matter for mining does it make sense still to do bitcoin mining 3. This video is unavailable. Bitmain released their AntMiner S5 Bitcoin miner in late USB Bitcoin mining was only profitable when Bitcoin was in its early years. S7 connectivity is via Ethernet. Best Bitcoin Mining Software. Bitmain is based in China and also operates a mining pool.

Bitcoin Mining Hardware Comparison

According to Bitcoin Magazine, BtcDrak remarked:. Any such advice should be sought independently of visiting Buy Bitcoin Worldwide. It may be a good choice just to see how mining works, but like with most USB miners: Buy Antminer S7 on eBay. In an effort to build trust with their potential buyers, Halong Mining released videos of their ASICs running as advertised. The S5 will draw between to Watts at around Volts. Sapphire Miner. Rating is available when the video has been rented. Buy Bitcoin Worldwide receives compensation with respect to its referrals for out-bound crypto exchanges and crypto wallet websites. What is the best power supply for a mining rig? UFD Tech , views.

In the beginning, CPU s were used to solve cryptographic hash functionsuntil miners discovered that GPU s were far better equipped for mining. So, given a much higher Bitcoin price, cheap power, stable Difficulty and perhaps modifications to improve efficiency, profiting from a new or used S5 is not impossible …. Add to Want to watch this again later? More Report Need to report the video? Unsubscribe from VoskCoin? Unfortunately, they already sold out of their first batch but a new batch should be available for sale soon. They have the best miner available. Before you buy an Antminer S5 make sure you already have Bitcoin mining software and dark matter cryptocurrency what is neo crypto Bitcoin mining pool. ProConsoles The Netherlands 1, views. Additionally, the T16 is remarkably power efficient, consuming a mere 0. Thousands of ASICs all mine simultaneously in a mining farm large warehouse. How to remove SMD components without hot air gun - Duration: The S5 will draw between to Watts at around Volts. Bitmain Antrouter. Only a gregory sanders bitcoin how to mine bitcoin in computer professional can offer legal advice and Buy Bitcoin Worldwide offers no such advice with respect to the contents of its website.

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We recommend purchasing the Dragonmint or the Antminer S9. Cheap mining hardware will mine less bitcoins, which is why efficiency and electricity usage are important. It works with just one USB port. The SP20 simplicity itself to setup. Nowadays all serious Bitcoin mining is performed on dedicated Bitcoin mining hardware ASICs, usually in thermally-regulated data-centers with low-cost electricity. Its hardware is not available for purchase. Sapphire Miner. One upside of the plastic casing is that the unit only weight 2. Our Bitcoin mining calculator is helpful for calculating the profitability of any Bitcoin miner, based on relevant data. The S5 will produce 1 Gigahash for every 0. Try messing with the calculator using different prices. It may be a good choice just to see how mining works, but like with most USB miners: If Halong Mining really did produce the most efficient SHA miner to date, the startup would prove their skeptics wrong and dethrone Bitmain, a company only concerned with their monopoly on the market. Steve Mould , views New. Sensitive information is stored on the blockchain rather than large data centers, and is cryptographically secured. The SP20 is a neat miner, powerful for its low price with a size and noise level suitable for home miners. How a quartz watch works - its heart beats 32, times a second - Duration: In order to see any bitcoins from a single S5, you will need to join a Pool.

Hash Rate: With coinbase zcash trends format to mine dash tweaking, it may be possible to profit from an S7 even at 15c power. VoskCoin 31, views. Profitability Factors The Bitcoin price and the total network hash rate are the how to ach transfer to coinbase online bitcoin mining contract main factors that will affect your profitability. Steve Mouldviews New. Autoplay When autoplay is enabled, a suggested video will automatically play. To improve your efficiency, there are also companies that will let you order hardware to their warehouse and run the miners for you. The Avalon Nano 3 is a 3. Choose your language. Jordan Tuwiner Last updated February 12, A list of PSU ratings may be found. One upside of the plastic casing is that the unit only weight 2.

The interactive transcript could not be loaded. Rating is available when the video has been rented. JayzTwoCents , views. BitFury — BitFury is one of the largest producers of Bitcoin mining hardware and chips. They are both cooled by dual fans. There are ways, ranging from simple to extreme, to manage the overclocking burdens. The next video is starting stop. No fan is required and it just plugs into your USB port on any computer. Sign in to make your opinion count. Other bundled equipment may be included with your purchase depending on the seller. Our Bitcoin mining calculator is helpful for calculating the profitability of any Bitcoin miner, based on relevant data. The units will automatically begin hashing upon powering up, which can be helpful in the event of power failure. Just Want Bitcoins? An incredibly profitable ASIC! It works with just one USB port. While an integral PSU makes for a compact and convenient miner, there are few other reasons to recommend such a setup. The S5 will draw between to Watts at around Volts. Buy Bitcoin Worldwide receives compensation with respect to its referrals for out-bound crypto exchanges and crypto wallet websites. The Bitcoin price is increasing at an average of 0. Playstation 3.

The strong metal casing features a tongue and groove system which allows for the neat arrangement of multiple miners. Over individuals took part in the development of the chip, including BtcDrakone of the leading pseudonymous Bitcoin core developers. A list of PSU ratings may be found. Buy Bitcoin Worldwide does not offer legal advice. Learn. Buy a litecoin how to move bitcoin from coinbase to bitstamp Queue Queue. We recommend purchasing the Dragonmint or the Antminer S9. Aim for value. The project is motivated by, and driven to help facilitate greater decentralisation in Bitcoin mining at all levels, and make SHA great .

Over individuals took part in the development of the chip, including BtcDrakone of the leading pseudonymous Bitcoin core developers. Sign in to add this video to a playlist. This video is unavailable. So, given a much higher Bitcoin price, cheap power, stable Difficulty and perhaps modifications to improve efficiency, profiting from a new or used S5 is not impossible …. Unfortunately, they already sold bitcoin becoming legal first step into bitcoin mining of their first batch but a new batch should be available for sale soon. Playstation 3. Miners shipped as described, and Halong delivered — quite literally — on their promises. Just Want Bitcoins? In an effort to build trust with their potential buyers, Halong Mining released videos of their ASICs running as advertised. How to remove SMD components without hot air gun - Duration: S7 connectivity is via Ethernet. Upon creation, Bitcoin blocks were confirmed by the average person using their desktop — once ASICs hit the market, things changed. USB Bitcoin mining was only profitable when Bitcoin was in its early years. BitcoinMining 51, views. They have the best miner available.

This limits the placement of the unit and somewhat reduces its safety. Hash rate — How many hashes per second can the Bitcoin miner make? DD ElectroTech 1,, views. Power Supply — Bitcoin rigs need special power supplies to funnel and use electricity efficiently. Rating is available when the video has been rented. Often a secondary fan is added to the back-end, where screw holes exist for this purpose. The S7 is also a popular choice among hobbyist miners for its reasonable price and strong performance. One upside of the plastic casing is that the unit only weight 2. A dry basement is an ideal location. Right now, this is the Halong Mining Dragonmint T1. Hash Rate: What is the best power supply for a mining rig? Be sure to take electricity costs into account. We recommend purchasing the Dragonmint or the Antminer S9. Don't like this video?

Watch Queue Queue. Buy Bitcoin Worldwide is not offering, promoting, or encouraging the purchase, sale, or trade of any security or bitcoin per hour what does the mean in ethereum miner. Our Bitcoin mining calculator is helpful for calculating the profitability of any Bitcoin miner, based on relevant data. Upon creation, Bitcoin blocks were confirmed by the average person using their desktop — once ASICs hit the market, things changed. The GUI displays temperatures and hashrate for each individual chip, plus other vital info. Please try again later. The SP20 draws a lot of power for its hashrate, which is low by modern standards. Linus Tech Tips 2, views. This feature is not available right. You can use our calculator below to check the mining hardware. They have the best miner available. Just Want Bitcoins? Its hardware is not available for purchase. Bitcoin and Altcoins 85, views. How to remove SMD components without hot air gun - Duration:

VoskCoin 31, views. If you just want bitcoins then invest in serious mining hardware or just buy bitcoins. Add to. I also go over a pico psu which basically allows you to run a gpu rig entirely off of a server hp delta ibm style power supply as the PicoPSU allows you to power the motherboard and a few accessories such as pcie risers with it. If you just want bitcoins, mining is NOT the best way to obtain coins. The S7-LN also excludes a cord. Hash Rate: Bitcoin mining is competitive. Take a look at the projected mining profitability of a single Dragonmint:. However, Bitcoin miners discovered they could get more hashing power from graphic cards. The plus side is it works as a wireless router, so you can do some mining while providing internet for all your devices. Buy Bitcoin Worldwide, nor any of its owners, employees or agents, are licensed broker-dealers, investment advisors, or hold any relevant distinction or title with respect to investing.

The plus side is it works as a wireless router, so you can do some mining while providing internet for all your devices. The APW3 requires a minimum Volts to function and does not ship with the necessary 16A power cord. ExpressITpl 1, views. The units will automatically begin hashing upon powering up, which can be helpful in the event of power failure. However, when mining on a large scale, every bit of saved electricity counts. The Bitcoin Price Bitcoin mining is a booming industrybut the Bitcoin price increasing can help make coinbase week reset fpga mining monero some of these losses. You can even use it to adjust voltages within reason on the board, to find that sweet spot between hashrate, power and heat. The company claims that the device runs completely silent. VoskCoin 31, views. Every visitor to Buy Bitcoin Worldwide should consult a professional financial advisor litecoin korea is bitcoin going back up engaging in such practices. Hash rate — How many hashes per second can the Bitcoin miner make? The difference buying altcoins in bitcoin how to buy bitcoins with debit card uk power consumption seems small. Price — How much does the bitcoin miner cost? Skip navigation. Nowadays all serious Bitcoin mining is performed on dedicated Bitcoin mining hardware ASICs, usually in thermally-regulated data-centers with low-cost electricity. You can use our calculator below to check the mining hardware. Due to its high power consumption, it generates a lot of heat.

Halong Mining — Halong Mining is the newest mining hardware company. Often a secondary fan is added to the back-end, where screw holes exist for this purpose. Skip navigation. Buy Bitcoin Worldwide, nor any of its owners, employees or agents, are licensed broker-dealers, investment advisors, or hold any relevant distinction or title with respect to investing. Most other calculators do NOT include this metric which makes mining appear way more profitable than it actually is. DD ElectroTech 1,, views. Adrian Black , views. Glerox , views. Sapphire Miner. Power Supply — Bitcoin rigs need special power supplies to funnel and use electricity efficiently. USB Bitcoin mining was only profitable when Bitcoin was in its early years. The major drawback is its relative inefficiency. The Bitcoin price and the total network hash rate are the two main factors that will affect your profitability. Bitcoin mining is competitive. Sign in to report inappropriate content.

Since miners use a large amount of electricity, you want to buy one that converts the most amount of electricity into bitcoins. With stellar performance comes a high price tag — the best ASIC chips will run you a few thousand dollars. YouTube Premium. Add to Want to watch this again later? Cooling Fans — Bitcoin hardware can easily overheat and stop working. The S5 will draw between to Watts at can you use trezor wallet to purchase bitcoins does trezor work with coinbase Volts. Price — How much does the bitcoin miner cost? The SP20 is a neat miner, powerful for its low price with a size and noise level suitable for home miners. Spondoolies crammed a total of eight 28nm RockerBox ASIC mining chips onto 2 circuit boards within a compact form factor. The units will automatically begin hashing upon powering up, which can be helpful in the event of power failure.

The Bitcoin price and the total network hash rate are the two main factors that will affect your profitability. BitFury — BitFury is one of the largest producers of Bitcoin mining hardware and chips. Corsair has a good reputation among Bitcoin miners and other tech enthusiasts for building reliable hardware. Apple won't like this The S7-LN also excludes a cord. But, efficiency is just as important. In an effort to build trust with their potential buyers, Halong Mining released videos of their ASICs running as advertised. Choose your language. The Bronze series offers good value. Bitmain released their AntMiner S5 Bitcoin miner in late Traditionally, each new BitMain miner series doubles efficiency. The S5 will draw between to Watts at around Volts. Add to. Upon creation, Bitcoin blocks were confirmed by the average person using their desktop — once ASICs hit the market, things changed. Miners shipped as described, and Halong delivered — quite literally — on their promises. S7 connectivity is via Ethernet only.

The S7 is twice as efficient as the S5 at converting all this energy into bitcoins; it requires a modest 0. You can even use it to adjust voltages within reason on the board, to find that sweet spot between hashrate, power and heat. Loading more suggestions The Bitcoin price and the total network hash rate are the two main factors that will affect your profitability. Autoplay When autoplay is enabled, a suggested video will automatically play next. Our calculator is more accurate than most others because ours assumes the 0. How a quartz watch works - its heart beats 32, times a second - Duration: A list of PSU ratings may be found here. Spondoolies unfortunately shut down on May 4 th Our Bitcoin mining calculator is helpful for calculating the profitability of any Bitcoin miner, based on relevant data. Buy Bitcoin Worldwide receives compensation with respect to its referrals for out-bound crypto exchanges and crypto wallet websites. Price — How much does the bitcoin miner cost? In the beginning, CPU s were used to solve cryptographic hash functions , until miners discovered that GPU s were far better equipped for mining. You can always check the profitability of a USB miner using our mining calculator. These prices can be expected to fall further as the S9 and other superior mining hardware becomes the new standard. Apple won't like this What do you get when you combine power and efficiency? The interactive transcript could not be loaded. See it ALL from unboxing to benchmarks!

If Halong Mining really did produce the most efficient SHA miner to date, the startup would prove their skeptics wrong and dethrone Bitmain, a company only concerned with their monopoly on the market. A dry basement is an ideal location. Buy Antminer S5 on eBay. The 8-Bit Guyviews. American Tech electrum how to change address how to claim bcc from trezor, views. Backup generators — You may want generators as a backup in case your main source of electricity goes. We are keeping the info here for historical purposes. Bitcoin mining is competitive. Before you buy an Antminer S7 make sure you already have Bitcoin mining software and a Bitcoin mining pool. YouTube Premium. The SP20 is a best privacy cryptocurrency sell currency on coinbase miner, powerful for its low price with a size and noise level suitable for home miners. Get YouTube without the ads. It works with just one USB port. The odds of solo-mining a block with a single or even several S5s are virtually zero. This video demonstrates oil immersion cooling. The S5 is open at the top and bottom and the sides are constructed of fairly lightweight plastic. That said, a cheap, second-hand S5 in decent condition is a great tool for learning the ropes of Bitcoin mining. Upon creation, Bitcoin blocks were confirmed by the average person using their desktop — once ASICs hit the market, things changed. You can use a bitcoin mining profitability calculator to determine your estimated cost of return on your mining hardware. Add to.

Often a secondary fan is added to the back-end, where screw holes exist for this purpose. With careful tweaking, it may be possible to profit from an S7 even at 15c power. It works with just one USB port. To improve your efficiency, there are also companies that will let you order hardware to their warehouse and run the miners for you. Backup generators — You may want generators as a backup in case your main source of electricity goes. I also go over a pico psu which litecoin vs neo exchange best bitcoin casino deposit bonus allows you to run a gpu rig entirely off of a server hp delta ibm style power supply as the PicoPSU allows you to power the motherboard and a few accessories such as pcie risers with it. Sensitive information is stored on the blockchain rather than large data centers, and is cryptographically secured. Unfortunately, they already sold out of their first batch but a new batch should be available for sale soon. How a quartz watch works - its heart beats 32, times a second - Duration: The SP20 draws a lot of power for its hashrate, which is low by modern standards. Most other calculators do NOT include this metric which makes mining appear way more profitable than it actually is. The Avalon Nano 3 is a 3. Unfortunately, Bitcoin is no longer as decentralized as it was once intended to be. Every visitor to Buy Bitcoin Worldwide should consult a professional financial advisor before engaging in such practices. VoskCoin 31, views. Spondoolies crammed a total of eight 28nm RockerBox ASIC mining chips onto 2 circuit boards within a compact form factor. If you just want bitcoins, mining is NOT the best way to obtain coins. Bitcoin mining is a coin info bitcoin buy bitcoin robinhood industrybut the Bitcoin price increasing zcash 780ti bittrex wallet good for holding long term coins help make up some of these losses.

Please try again later. The Bitcoin price is increasing at an average of 0. Bitcoin mining is competitive. Hash rate — How many hashes per second can the Bitcoin miner make? Naturally, the hotter the environment, the more energy the fan s will consume to cool the unit. Our calculator is more accurate than most others because ours assumes the 0. Avalon Nano 3. A dry basement is an ideal location. Halong Mining — Halong Mining is the newest mining hardware company. Thousands of ASICs all mine simultaneously in a mining farm large warehouse. The difference in power consumption seems small. A list of PSU ratings may be found here.

Profitability Factors The Crypto mining distribution mining algorithms crypto price and the total network hash rate are the two main factors that will affect your profitability. The Bitcoin Price Bitcoin mining is a booming industrybut the Bitcoin price increasing can help make up some of these losses. Don't like this video? Buy Bitcoin Worldwide does not offer legal advice. They are both cooled by dual fans. Hash rate — How many hashes per second can the Bitcoin miner make? Linus Tech Tips 1, views. The difference in power consumption seems small. The units will automatically begin hashing upon powering up, which can be helpful in ethereum code language cpu with highest hashrate event of power failure. If you want bitcoins then you are better off buying bitcoins. You can use our calculator below to check the mining hardware. Learn. The S7 is also a popular choice among hobbyist miners for its reasonable price and strong performance. Sapphire Miner. There are also Bitcoin hardware wallets like the Ledger Nano Swhich store bitcoins. In the beginning, CPU s were used to solve cryptographic hash functionsuntil miners discovered that GPU s were far better equipped for mining.

How to remove SMD components without hot air gun - Duration: Be sure to take electricity costs into account. S7 connectivity is via Ethernet only. Aim for value. The units will automatically begin hashing upon powering up, which can be helpful in the event of power failure. Bitmain is based in China and also operates a mining pool. The Bitcoin price is increasing at an average of 0. To improve your efficiency, there are also companies that will let you order hardware to their warehouse and run the miners for you. VoskCoin Official Donation Addresses, support appreciated! Buy a sufficient amount of cooling fans to keep your hardware working. Buy Bitcoin Worldwide is not offering, promoting, or encouraging the purchase, sale, or trade of any security or commodity. Power consumption watts:

In the beginning, CPU s were used to solve cryptographic best bitcoin marketplace reddit cool wallet bitcoin functionsuntil miners discovered that GPU s were far better equipped for mining. How to remove SMD components without hot air gun - Duration: A dry basement is an ideal location. Hash rate — How many hashes per second can the Bitcoin miner make? Loading more suggestions S7 connectivity is via Ethernet. The strong metal casing features a tongue and groove system which allows for the neat arrangement of multiple miners. Often a secondary fan is added to the back-end, changelly does not work with us bitcoin projections million screw holes exist for this purpose. Good Bitcoin mining hardware needs to have a high hash rate. ProConsoles The Netherlands 1, views. More hashes cost more, which is why efficiency is crucial. Cooling Fans — Bitcoin hardware can easily overheat and stop working. Add to. The S5 will automatically search out an available IP address to use and features an intuitive control panel. Every visitor to Buy Bitcoin Worldwide should consult a professional financial advisor before engaging in such practices. A list of PSU ratings may be found .

The Spondoolies SP20 was a great mining device in its day. Hash rate — How many hashes per second can the Bitcoin miner make? BitcoinMining 51, views. The S5 is also a good platform to experiment with hardware, firmware and software tweaks and mods. Due to its high power consumption, it generates a lot of heat. Backup generators — You may want generators as a backup in case your main source of electricity goes down. Since miners use a large amount of electricity, you want to buy one that converts the most amount of electricity into bitcoins. A list of PSU ratings may be found here. Like this video? Autoplay When autoplay is enabled, a suggested video will automatically play next. Buy a sufficient amount of cooling fans to keep your hardware working. S7 connectivity is via Ethernet only. JayzTwoCents , views. Before you buy an Antminer S5 make sure you already have Bitcoin mining software and a Bitcoin mining pool. If you just want bitcoins, mining is NOT the best way to obtain coins. You can always check the profitability of a USB miner using our mining calculator. The efficiency of power supplies is a worthy topic of investigation for any aspiring Bitcoin miner; inefficient, unrated power supplies will waste electricity and create extra noise and heat. Loading playlists

Any such advice should be sought independently of visiting Buy Bitcoin Worldwide. Best Bitcoin Mining Pools. The best ASIC miner is the most efficient bitcoin miner. In the beginning, CPU s were used to solve cryptographic hash functions , until miners discovered that GPU s were far better equipped for mining. Glerox , views. Just Want Bitcoins? Often a secondary fan is added to the back-end, where screw holes exist for this purpose. Sign in.