Spam marketing via PM: Hi 2112 We launched kryptologika.com last week for the Polish market. Now our website is available also in English for the wider community Wink We have competitive prices, reasonable maintenance fees and lots of TH/s to share with you! We are also promoting investing in physical silver, each TH/s is backed by 1 Oz of pure silver in the form of bullion coins (1GH/s = 0.001 Oz). Perhaps you can check our thread on bitcointalk and leave your feedback? https://bitcointalk.org/index.php?topic=732733.msg8329115#msg8329115Many thanks |
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No, the lab is in Israel. I am actually flying on a 3 day vacation tonight, but we will check this. It's in our interest to provide as much hashing as possible to every voltage.
OK, enjoy your time off. In the past I have dealt with "electromagnetic compatibility" labs that were targeting "new economy" vendors hopeful on entering the rich US market. Those vendors were from e.g. Malaysia Technology Super Corridor, where scam relied in large part on the language barrier. This clearly isn't the case with your company, because everyone seems to fluent in English. |
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We work with FCC lab that provide us the FCC compliance. I get the requirements in form of document from our HW team, which is called FCC compliance document, so I call all those limitations FCC compliance limitations.
I for sure did not read all the documents that we need for safety compliance, and have no idea where they come from. I will try and check with HW team where this limitation is from.
Please do look it up. FCC regulations would deal with the things like harmonic emissions from the cables, which could be easily solved by a ferrite choke clamped on them. In the past I've dealt with the fake/scummy/incompetent "electromagnetic compatibility" labs/inspectors, but never heard of one in Israel. FCC is a fairly weak organization, as far as "the Feds" go. In the past some enterprising scammers even set up fake "RF emission labs" in an acoustic anechoic chamber that was sufficient to confuse inexperienced people and scam them out of payments for "expert evaluations" that were nearly worthless. In USA this is called "private enterprise" and "public/private partnership". Edit: Are you by chance dealing with a remote "mail delivery only" lab in the USA, where nobody knowledgeable from your company ever visits the actual lab? |
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Up to 210V we can not pull more then 1250watt from the Emerson because of the FCC limitations on current in wires.
Whose limitation? FCC? It stands for Federal Communication Commission and deals with radio-communication interference. Could you please look up the actual source authority for the limitation you're mentioning? |
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Where does Bitfury get their cheap electricity?
It isn't electricity cost that differentiates them. They are amongst the few that understand that Bitcoin mining doesn't require data centers, it is more like industrial/agricultural drying facilities. They save capital by not using esoteric cooling and precision power supplies. Most of the competition still can't get out of their "DC" mental/verbal box they put themselves in. They still put their equipment in 19" racks and derate their power circuits to 80% like if they were to be used long term. |
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* silicon defined UART
* software defined UART
I'd like you to post links to the chip data sheets and computer I/O products that are the examples of two UART classes that you've just defined. Otherwise I'm going to call baloney. Edit: forgot to quote the full message into my collection. Thank you roman.z for contributing another soft modem to the world. They're pretty cool! At first I thought this wasn't a good fit for bitcoin tx signing and was having the same "why not use RS-232" thought of others. The one downside to using this is that it introduces yet another bus layer. Anyone using this should wonder if there is a security flaw in the decoder where a malicious encoder could break away from the bus layer and actually screw up the decoder software sufficiently to take over its execution environment. At least this can be audited for with this being a soft modem. Ideal setup is probably to use RS-232 with the signing side RS-232 UART implemented in silicon (such as a super I/O chip), not by a firmware. Chances are that if the internet side of this is messing with the bus layer (if it were software defined and not a hardware UART) that it can't break past the signing side being hardware defined for the bus. That way all security audit focus can shift to the data layer to make sure no malicious break-outs can happen there. Regardless of the link type, the quality of this layer of software will be the most important thing. But, I appreciate that many people don't have the option of having a hardware UART on the signing side, so this is awesome. Particularly because USB is not so very awesome: http://www.wired.com/2014/07/usb-security/Malicious firmwares on USB devices can do all kinds of nasty things to the host computer -- you don't want a compromised USB RS-232 adapter to be connected to your signing computer. Let's go through some scenarios: If you trust your RS-232 USB adapter for the your signing computer at the time of purchase, and if you can protect its integrity thereafter, consider two sub-cases: * Your internet side computer has a silicon defined UART -- there is probably no way it can mess with the bus layer aside from changing configured speeds and such and probably can not compromise the firmware of the software defined UART in the signing side RS-232 USB adapter * Your internet side computer has a software defined UART as well and can thus mess with things at the bus layer -- I'm going to say it is possible but unlikely that it could use that level of access to compromise the signing side USB device on the other end of the cable. There would have to be a security bug in the signing side USB firmware. Downside here is that these firmwares are mostly proprietary and thus costly to audit. There very well may be situations where the continued integrity of the adapter can not be assured but the integrity of the signing computer can be (not simply by guarding it, but ensuring anyone who reaches it can't mess with it by using a TPM to ensure firmware and boot process integrity with the rest of the disk encrypted, fancy unique security seals on the case and regular internal inspections). Write your fan fiction here folks where someone gets over the fence, drugs the dog, drugs the guard, hacks the walkie-talkie watchdog feature, hacks the security cameras sending video feed out by celluar to keep showing silent night, temporarily disables one alarm system with watchdog with fake watchdog, weaves through lasers of other alarm system that can't be disabled, cracks the safe, finds the USB adapter with the unique case, pops it open, desolders microcontroler that lacks flash memory (firmware uploaded on connect by computer), replaces with microcontroler that has malicious firmware flashed on, gets out of there by jetpack on the roof..... exchanges tumbled bitcoins for beachfront property in Caribbean... |
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I thought "oh since i format I'll be fine" and then reading that. my trashcan got a little fuller.
If you didn't throw away your trashcan yet: take those USB sticks out, clean them and donate them to a local charity. They are still useful for non-paranoid people. |
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How safe is to download the blockchain from a source that isn't directly Bitcoin QT? Im too paranoid in regards to this so I always end up downloading it directly from the software. Could Bitcoin.com have an at least weekly updated torrent?
With this level of paranoia you'll really be better off by seeking help from the behavioral health professional. Or maybe a clergyman. The honest computer science professional will have no constructive advice to you. You'll become just a fodder for computer science quacks or scientologists. |
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Just speculation here as to the potential drawbacks of this method.
Chances of corrupting bitcoin client by feeding it a corrupted bootstrap.dat are the same as feeding it corrupted data through the listening port: pretty low, mostly wasting time and bandwidth. The only nefarious thing I can think of is to seed it and listen for the fresh leechers. Statistically speaking there's much higher chance than the leecher of this torrent is a Bitcoin beginner and is possibly somewhat impatient. Therefore there are bigger chances that the leeching computer is still not properly configured/secured and attacking it may give a higher chance of finding a successful exploit. |
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I don't pretend to be a tracker expert, and actively solicit suggestions.
I would certainly bias towards less politicized + more reliable trackers.
Please post your tracker suggestions.
I nominate two trackers that are open, differently politicized and seem to work reliably globally. http://tracker.humblebundle.com:2710/announcehttp://bttracker.crunchbanglinux.org:6969/announceIf you are changing trackers in your torrent, please replace remove ccc.de with demonii.com. In my opinion it doesn't make sense to use more than 6 classic trackers in addition to DHT and PEX that are used in a non-private torrent. You should be able to change the torrent without changing infohash, the trackers are in the "announce" section that isn't covered by the hash of the "info" section. There are apps and web sites that will help you do that change, although I don't have links handy. From the other trackers that were used in the past: h33t.com domain is disabled by a complex legal issue and won't be back for a while. I'm not a torrent&tracker expert either, but have fresh experience troubleshooting these problems for the others. Edit: The exodus.desync.com tracker in the previous torrent seems to be working well.
No, please don't. This is an example of dual-stack IPv4+IPv6 tracker that causes problems to many Windows users. Modern Windows versions support IPv6 out-of-the-box via Teredo tunnels and this just causes trouble and confuses the beginning users. The IPv4 side of this tracker is not globally accessible, some big European ISPs are on their block-list. Edit2: Upon further review of the recent torrent statistics in Windows I'm going to advise against using open.demonii.com. Again the problem is dual stack IPv4+IPv6 with bad accessibility from various places around the globe. Edit3: Since I've posted this humblebundle.com implemented registration & filtering in their tracker, so it won't work with 3rd party torrents. |
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Does tracker.ccc.de work for anyone anywhere in the world besides .at, .ch & .de?
Maybe it should be changed to "udp://open.demonii.com:1337" like all the newer torrents? This new tracker is accessible worldwide.
Edit: After reviewing the recent statistics of reach-ability of demonii.com I no longer recommend it.
What about other trackers? Open, less politicized, trackers, that aren't associated with thepiratebay.se? Or maybe differently politicized trackers associated with other organizations? While those 4 trackers are reliable and well defended against DDoS, they are also the ones that are most commonly blocked/censored/filtered by various software nannies.
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Valery's full custom unique method is extremely challenging on the more advanced nodes. As I wrote, they're scrapped their 20nm effort after investing a lot of time on it.
The "challenge" you talk about: is this just due to BSIM4 models being much more complex than BSIM3 models? Or is there another component or free variables that make their design methodology more challenging? The way I understood them they did 55nm-drawn transistors using 65nm-nominal process (or similar step down). Or maybe you are just talking that the analog design is more challenging than the digital design? |
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People are posting fantasy and fiction as sources of information. I wanted to post a concrete scientific information from a specialist, but unfortunately their web site is now gone. I'm going to cut-paste my post from almost two years ago. The referenced document is now gone, but you may be able to scrape some real information from various references to it and web caches. What would happen if all satellites went down for a day?
Pretty close to a complete communications blackout. Vast majority of fiber optic links are synchronous with the clocks synchronized off of the GPS (or equivalents). If you disable GPS the clocks will drift off in less than a day and the communication will cease. Obviously rich countires have access to multiple precise atomic clocks (cesium, rubidium) and will be able to restore operation of some most critical fiber-optic links. Poorer countries will have to make do with the old radio-stabilized quartz oscillators. The quickest to fail will be all CDMA carriers (Verizon,Sprint,etc.) because of high required timing precision. GSM carriers (ATT,T-Mobile) will fare better. Various 4G and 3G schemes will fail even faster, but almost all wireless cariers have the above older systems as a backup. The old style T1/T3 connections (E1/E3 in Europe) will last the longest because they operate plesiochronously. Afterwards there will be a great amount of energy spent to fix this vulnerability. But the current situation is as described: GPS stabilized clocks are everywhere. http://www.chronos.co.uk/files/pdfs/wps/Dependency_of_Comms_on_PNT_Technology.pdf |
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@2112 I run a 3D printing bureau, while I agree with your sentiment generally you are correct but SLS nylon printing would render a functional replacement gear for under $100, and for a similar cost we could CNC one from acetal, still cheaper than replacing the drive unit limited by today's tech and economics of scale.
But the fact the design is not open is the problem.
You could produce a single gear that would work temporarily in an emergency. But replacing a single gear in a gear transmission causes radically faster wear of the both gears. So the failures cascade. This is the reason why the "gear drives" are sold as "matching sets". From school days I remember workshop making a replacement gears from the obsolete soft plastic called "textolite" and replacing this "waste" gear frequently just so they can save the other gear, of much higher diameter, which they couldn't produce using available tools. Anyway, if you guys don't have a genuine mechanical engineer involved in the project, then don't use the crutch of 3D printing. I understand that you aren't working on a "gear" but on a small, pocketable, (or purse-able, if there are any women using Bitcoin) "widget". See if you could fit your electronics in a known, sturdy, small package, like a NIVEA creme 1oz tins: "classic" for a shielding metal case and "soft" for the EMF-transparent plastic case. Those things are nothing fancy, they may even look ridiculous, unless you call them "camouflage case" or "steganographic case". Since this is mostly a software & electronic thread, I'm going to make another comparison: 3D printing is to mechanical engineering like Microsoft Visual Basic (classic, not .NET) is to software engineering. You can slap something together that may be able to impress inexperienced people. But you are highly unlikely to produce something durable. And you may push your overall project to a near failure (like Trezor) with endless delays and cost overruns. I tried to convince slush and stick in their thread to avoid trying to get fancy and trendy, you could search their thread for "eyelet". They didn't listen. Maybe someone here will listen. |
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I took the machine apart and eventually identified the little plastic gear that was broken. But I couldn't buy just that gear--I had to buy an entire "motor drive unit" for $450. Anyways, I got it working, but if you look at the time I spent plus the cost of the unnecessary parts, this little plastic gear ended up taking about $1,000 of energy to fix!
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Now imagine if this design was fully open. I wouldn't even call Miele. I would call my local "fixer guy," he'd take the machine apart, identify what was broken by cross-referencing the exploded-view engineering drawings, go online to download the STL file, print it on his 3-D printer, and install it for me. This would give someone local a job, save me a huge amount of money and time (instead of spending a day fixing a coffee maker I can work on bitcoin), and reduce the impact on the environment (we would only print the part we needed--not the entire "brew drive unit").
I just quoted this for posterity: height of a naiveté about 3D printing a "plastic gear". Yeah, you could print it and it would probably last couple of days as a replacement for a properly molded/machined gear. 3D printed stuff is most often about order of magnitude weaker than the part manufactured using classic methods. Geared transmissions are the prime example of that problem. I understand that this is a side-argument to the primary of "open source" or "blueprints available" argument. But with the introduction of 3D printing you've seriously weakened your reasoning and completely messed up your cost comparison. Basically I'm typing this in in this thread to highlight that references to 3D printing usually mean that the proponent has no idea what he's doing and the effort will be delayed and over budget. For a recent example hop over to the Trezor thread. They 3D printed a prototype that is very expensive/nearly impossible to properly manufacture by injection molding and other conventional methods. It was basically painting a bulls-eye on themselves that says: vendor, rip me off, I'm out of my engineering expertise area and easily fall for bullshit sales techniques. |
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I also don't understand how to be able to make sql queries to the database as I don't see any tables after loading wallet.dat. It just opens "main" db which I assume means that it didn't really open up wallet.dat at all.
Ah, sorry. You'll need to hit the textbooks about databases. BerkeleyDB is a form of NonSQL database called key-value-store. If you are at that stage where "database" has to support "sql queries" then you are at least semester away from understanding what's inside. Older editions of C.J.Date's book have most of the relevant material about "non-relational databases". Again, sorry. |
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Yeah, just install the correct version of BerkeleyDB utilities. Then do a backup, modify/delete the unnecessary lines from the backup file (which is a text file) and restore back.
Please remember to create DB_CONFIG file with "set_lg_dir database" in the appropriate directory.
Detail were discussed several time on this site, at least a year ago.
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The demurrage bothers me. I was mining this coin as an alternate to BTC until I noticed the coins in my wallet decreasing by a very small amount. At first I thought maybe the wallet was hacked and someone skimming a portion of my coins thinking it wouldn't be noticed. To my disgust I found this article explaining it was not only a normal process but acceptable as well. Seems like bad business to take a buck out of my wallet when I open it. I don't think it's right and will not mine this coin any longer.
I'll just quote it for humor value before its get deleted. |
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I'm afraid it might be you who lacks the understanding of physics. There is a very hard limit to the max heat density you can cool via heatsink/fans. Notice how heatsink on high powered chips are always much larger than the chips? With immersion cooling you only need a tiny amount of fluid covering the chip.
Another fine example of somebody with high-school education giving engineering advice. The limit on two-phase immersive/evaporative cooling is created by vapor bubbles that have significantly lower heat conductivity than the liquid phase. For Bitcoin mining this shouldn't be the case because the devices work in a steady state. It really matters only with devices working in the impulse modes, where the time between the power impulses is higher than the time to release the bubble from the surface and replace it with a fresh, colder liquid. Here is a fun Google Images search: http://www.google.com/imghp?q=vapotronVapotrons were designed for immersive/evaporative cooling with distilled/deionized water, and be capable to operate in the impulse modes of "Class C" analog power amplifiers. Note the carefully designed evaporation grooves. What you can't see is the special processing of the surface to produce many steam nucleation sites. Again, this doesn't really matter for Bitcoin mining. But for a really high-power application you really would've designed bubbling groves (thick & shallow heatsinks, really) and care about producing many vapor nucleation sites on the surface. This means that mirror-smooth backs of silicon chips are actually rather inefficient for immersive-evaporative cooling. I remember that there is a really nice high-school level demonstration of this effect. In a really smooth and clean glassware one can heat water in a microwave to more than the boiling point. Then you can induce explosive boiling by dropping a rusty metal pin into the super-heated liquid. The good thing in Bitcoin mining is that the coarse black plastic IC packages naturally have a lot of nucleation sites. |
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but being proud owners of some pricey storage containers and a chunk of land to keep them on.
I don't think that's the case. They way I understand this DataTank Mining is purposefully set up in Panama so that investment in them doesn't create any mortgage, secured debenture, collateralized loan, etc type of relationship. In other words in case of DataTank Mining going bankrupt Allied Control takes back the possession of the equipment leased to DataTank Mining. It is tried-an-tested method of diluting the liability, the international version of "HashFast,CA vs. HashFast,DE" that is right now playing in a neighboring subforum. |
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