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1  Bitcoin / Wallet software / anyone make their own USB cables from scratch? on: January 19, 2020, 01:41:22 PM
per title.. would suck bad to use a compromised cable with a hardware usb connected wallet. maybe this is overblown? although this (bluetooth chip or even just memory to cache communications) is in prototype phases and as such it is a real possibility.

as it seems with the extremely small chips that could be hidden in a usb cable/connector now, and the proof of concepts out there demonstrating it. so to protect against that, seems it should be easy to make your own cables to meet minimum usb1.1 spec.

anyone done so?

EDIT: aaack. meant to put this in Hardware Wallets. if a mod could please move it there if more appropriate, thanks.
2  Alternate cryptocurrencies / Mining (Altcoins) / those who have BCU1525s at home, how are you running them? on: December 20, 2018, 11:56:56 AM
so my bcu1525 arrived yesterday, the upgraded air cooled version. i must say it looks to be a solid piece of kit.

currently running on the allmine shell with the "built in" lyra2 algo at blaze pool at ~40ish mhs (blaze auto switches to btc) for testing. its on a dedicated rig, a gigabyte Z97X UD3H with an evga 850. ubuntu 18.04, i ssh into it to control it. draws 350ish watts at the wall according to my killowatt meter. been running about 12 hours now, no problem.

now i know there are lots of bitstreams this thing can run but to do so you need specific settings in the shell (startup voltages etc) or bad things can happen. you also need to load some bitstreams (the non sqrl ones like whitefire/sensless stuff) via usb from a windows machine, and i havent got that far, mainly because im afraid of blowing it up.

anyone with a bcu1525 running other bitstreams? if so how did you set it up? i do have a windows rig next to it (my gpu/acorn mining rig) and have connected the usb cable from the windows box to the bcu. but thats about it.

btw the sqrl fan can get pretty loud, its running about 3800 rpm atm (perhaps half speed?). input power
around 260 watts, fpga temp 74C

i would love to play with more bitstreams and such but info is spread around so many places and so piecemeal its hard to find and digest. i hope we can consolidate some here.

3  Bitcoin / Bitcoin Discussion / whats the scariest almost mistake youve make transacting in btc on: January 05, 2018, 11:49:03 AM
not including almost placing orders in bfl, blackarrow etc, but making a transaction.

for me sweeping old paper wallets to claim bcash. i had done several already through mycelium on android but the biggest one i decided to send direct to my trezor, and not sweep to mycelium 1st as i had on the others. i send a small amount, check, then send the rest.

well this time i decided to sweep directly to the trezor and not use mycelium as an intermediary storage point, then send from there. it was a large amount. so i send 0.01 btc to the trezor. and i forgot about change addresses (DOH). thought i had sent the change to the great black hole.. so i was sweating bullets till i saw the change had been sent back to the original paper wallet address.

it was pretty nerve wracking to say the least as that paper wallet had about 20% of my btc.

btw i keep all swept paper wallets so i can sign them to prove ownership if needed (for good old tax man). plus there may still be forked coins in there, wallets were from 2014.

soo, any other near btc death experiences?
4  Bitcoin / Bitcoin Discussion / why wouldnt a government create its own asic to 51% bitcoin? on: August 13, 2017, 03:38:49 PM
as per the title.. whats to prevent the government of a large country to designing and using an asic purely for itself? they have the resources, the amount of money is trivial (for a government), power would not be a problem as they could build a power plant just for the mine to use. ultimate goal would be to control bitcoin. and make some money but that would be trivial. they wouldnt recap the investment but thats not the goal anyway.

sure lots of up front money and time but again, a government wouldnt care, and the long term gain in controlling btc might be worth it.

only bottleneck would be fab capacity. maybe buy or build one?

the fact that no government is trying this means my thinking is flawed somehow. so whats the catch?

EDIT:  goal is to for a 51% attack on bitcoin to cause people to lose faith in crypto, thus destroying it.

EDIT 2: i used 51% attack as an example as it is a well known figure. but the government that tries this could just as easily go for 70% or some other number that allows them to roll back the blockchain by an arbitrary amount, say several days worth of blocks.
5  Bitcoin / Bitcoin Technical Support / want to use 14.2 seeds on old wallet. need to make new wallet? on: July 22, 2017, 10:36:26 AM
i have been running core since ver .3 in 2011 or so. just kept upgrading the wallet as new versions came out..

so 14.2 supports HD seeds. is there a way to convert my existing wallet to seed based? can make a seed, make a new addy and transfer all btc the the new addy in the existing wallet? then from that point on im good and can recover from just the seed?

or do I have to create a new 14.2 wallet thats seed based and transfer all from the old wallet to the new wallet?

prefer to keep using the original wallet as is has my complete history all the way back to my 1st transaction in 2011. all annotated with labels etc.

i would of course keep the old empty wallet around if i make a new one.
6  Bitcoin / Bitcoin Discussion / what was your first incoming transaction? on: June 19, 2017, 02:21:15 PM
still running my original core wallet from june 2011.

just checked my 1st transaction.. 0.35 btc from slush on june 16, 2011.

that was with mining with my HD4850. it was more of an experiment than a money making endeavor or to be part of the crypto scene. more like to see maybe i can help finance a new video card if this one makes money.

used slush as my 1st pool as they had the best instructions on how to setup a miner.

anyone else care to share their 1st incoming transaction and where it was from?
7  Bitcoin / Bitcoin Discussion / bitmain and asicboost/segwit on: April 06, 2017, 02:02:30 PM
this is probably obvious but i havent seen a clear yes/no answer on this:

if segwit activates on btc (fat chance) will bitmains recent asics stop hashing? if so which models?
8  Bitcoin / Bitcoin Technical Support / reindexing blocks on disc on: February 15, 2017, 10:55:12 PM
using core 0.12.1

my computer locked up on a blockchain sync (it was behind a couple days). fired it back up and got a database error. so now its reindexing the blocks on the disc.

this seems to take a LONG time, its already been a couple hours and its maybe 1/5 of the way through.

i have a 3570k @ 4.3, 12 gb ram and the blockchain is on its own dedicated 256 gb ssd.

so the question is: is this speed normal? I seem to remember reindexing going a lot faster in earlier versions of core.
9  Alternate cryptocurrencies / Mining (Altcoins) / HD6870/HD5830 - any coins worth mining on: August 27, 2016, 01:06:10 PM
did a quick search but all i saw were years old posts about it.

have a HD6870 and HD5830, both 1 gig cards, from back in the BTC GPU days. just built up a test rig with the 6870 and i might as well mine something even if its more or less break even, cool temps are on the way here and a space heater for the basement may come in handy.

i mine eth with R9s but of course these cards wont cut it.

any suggestions?
10  Alternate cryptocurrencies / Altcoin Discussion / [delete me] on: August 08, 2016, 11:10:00 AM
EDIT: never mind, User Error
11  Alternate cryptocurrencies / Altcoin Discussion / lightweight etc wallet? on: July 26, 2016, 11:41:04 AM
i have the mist wallet for ethereum. the forked one, not etc.

i had eth before the hard fork, and i setup mist 8.1 to track on the forked chain. so now i would like a wallet for the alter ego eths in etc, and keep track of both.

i would rather not deal with 2 complete blockchains. so something like a SPV wallet (if i have the terminology right). any suggestions?

EDIT no interest in which is "real" please. we know plenty of threads where we can argue that rather entertaining stuff.
12  Bitcoin / Armory / have armory use blockchain on D drive on: May 14, 2016, 01:21:21 PM
ok idiotic question time.

so Im trying to run armory, ultimately to import a wallet from 2012.

my blockchain is on drive d "d:\bitcoin-blockchain". core is in its default location "C:\Program Files\Bitcoin\bitcoin-qt.exe"

I ran armory went to settings, I pointed the "bitcoin install dir" option to "C:\Program Files\Bitcoin\bitcoin-qt.exe" and "bitcoin home dir" to "d:\bitcoin-blockchain"

I have core running. then I fire up armory. and it sits there saying "armory is offline"

what am I doing wrong? does it have to do with the blockchain locations? I do NOT want to dl another blockchain just for armory, core and armory can share correct? an both run at the same time?
13  Bitcoin / Armory / armory wallet from 2012 on: May 13, 2016, 11:56:15 PM
so..

i have an armory wallet from 2012. my core wallet says I transferred some coins to it. i did a lot of moving coins around back then from wallet to wallet as, well, there wasnt much else to do with them at that time. so now i want to recover the wallet and see whats in there, if anything.

can i just install armory, get it up and running and just drop a 2012 wallet in there? just do  the armory equivalent of "--rescan"?

sorry if this is all in a README but i just figured id toss this out in case there are any obvious "gotchas" i need to watch out for. havent even downloaded it yet heh
14  Bitcoin / Bitcoin Discussion / ever find an old wallet? on: April 24, 2016, 02:12:45 PM
so just happened to scroll back through my wallets history. its the original wallet I made back in 2011. one transaction said "sent: Ubuntu". never remembered it. with no corresponding "received from Ubuntu"

well.. I back things up like crazy and sure enough look through old backups and theres a file named "Ubuntu.wallet.dat". oh yeah..

rename my current installs wallet.dat, copy the ubuntu one in, rescan and there it is. 5.0 bitcoin. exactly that one transaction. nothing else.

its kinda like finding a couple grand under the sofa cushion Smiley

price around aug 2011 was around $10.

so, anyone else find old btc you forgot you had? talk about HODLing
15  Bitcoin / Mycelium / Mycelium and BIP38 paper wallet question on: January 04, 2016, 12:18:48 AM
Im sure this is answered somewhere but my search-foo must suck..

I just installed Mycelium 2.5.9 onto my note 4. I have BIP38 encrypted paper wallets. what I would like to do is transfer the whole balance from one of these paper wallets to Mycelium, and from there most (or all) to my main hot wallet.

so do I just select Cold Storage Spending, scan the QR code, enter the password, and enter an addy to send it to? or does it just import it into Mycelium. where does change go if its not the whole amount? I rather not keep that paper wallet addy with anything in it, Id just make a new one.

sorry for noob questions, Ive only run the official core wallet with a full node on my desktop.
16  Bitcoin / Hardware / [HOWTO] flash your jalapeno to 8+ ghs on: June 27, 2013, 12:47:45 AM
Jalapeno Flash howto.

This howto will walk you through flashing your BFL Jalapeno.

PLEASE NOTE: THIS WORKS FOR ME. HOWEVER I TAKE NO RESPONSIBILITY IF YOU BRICK YOUR JALLY. MY JALLY IS A "HOT" MOSFET UNIT AND I HAVE EXTRA COOLING. EVEN "GOOD" MOSFET JALLYS SHOULD USE EXTRA COOLING AS STOCK JALLYS ONLY GO TO 7 GHS, THIS CAN TAKE YOU TO 8+.

not all jallys will reach this, depends on the chip grades you have. my 5 ghs has two good chips, 15 engines each. YMMV.

AFAIK all jallys with aluminum heatsinks are "good" mosfet jallys. look at Q1-12, if you have 2 different sizes [6 one size, 6 another] this is a unit with "good" mosfets - you should be good to go. mine is a "hot" mosfet jally (all mosfets same size) and with LOTS of additional airflow Im OK. but HEATSINKS ON YOUR MOSFETS (AND 1850 CHIP IF YOU CAN GET TO IT) ARE A GOOD IDEA.

seems at least some 7 ghs jallys (and 7s only?) come with heatsinks on the mosfets now. see warhark187s post here.

temps @ 23 C ambient, caseless, top fan blowing down, with 120v 22 watt "muffin" side fan:

before flash  30C 3.1v
after flash 37C 3.1v

WHAT YOU NEED:

source code from BFL
https://forums.butterflylabs.com/announcements/3282-bitforce-sc-firmware-version-1-2-5-a.html

and/or

the .hex file from BFL, just in case you have trouble compiling it (I did initially).
https://bitcointalk.org/index.php?topic=235312.0

atmel studio 6.1 - I grabbed the Full installer (806 MB)
http://www.atmel.com/tools/ATMELSTUDIO.aspx

AVRDragon:
http://www.atmel.com/tools/AVRDRAGON.aspx

digikey seems to have the dragon also.. I had already ordered from atmel though.. DOH
http://www.digikey.com/product-detail/en/ATAVRDRAGON/ATAVRDRAGON-ND/1124251

USB AB cable for the Dragon
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=usb+ab+cable&N=100006519&isNodeId=1

10 pin JTAG cable.
something like this . its just the 1st link I found
http://compare.ebay.com/like/190681930364?var=lv&ltyp=AllFixedPriceItemTypes&var=sbar

I just cut down a 40 conductor IDE cable. (mine is cut to 2x6 as i was sloppy)



thermal tape or paste if you disassemble your jally. the chips are bare silicon so I recommend you reuse the tape and just add some paste to fill on the voids if the tape falls apart. or just use new thermal tape. using paste alone is a good way to crack the chips if you are not VERY careful. the tape helps cushion the heatsink.

cgminer 3.3.1 - its the earliest version that will properly handle the 1.2.5 firmware jally. my picture below shows 3.2.2 but I compiled from git just before 3.3.1 was released.
https://bitcointalk.org/index.php?topic=28402.0

my heatpipe jally had plenty of clearance for the middle (now end) IDE connector to slip on without removing the heatsink.

aluminum heatsinks probably will require you to remove it to get the cable on the jtag connector. if you cant get the heatsink back on with the cable attached you will need to find a way to keep the chips cool while you program them. right after programming they will be tested so will generate some heat. danattacker used the metal backplate pressed down on the top of the chips after he masked off the surrounding areas with masking tape.

SEE DANATTACKERS POST BELOW ON ALUMINUM HEATSINK JALAPENOS. DO NOT RUN YOUR JALLY WITH NO HEATSINK!!



ATTACH THE CABLE: (IMPORTANT: REMOVE THE BLACK ANTISTATIC PADS FROM THE DRAGON BOX BEFORE POWERING IT UP IF YOU RUN IT IN THE BOX AS I DID)

power off the dragon and jally. connect one end to JTAG on the dragon, the other to JTAG 1 on the jally. MAKE SURE PIN 1 GOES TO PIN 1! plug the dragons USB and the jallys USB cable into the computer (the dragon did not recognize my jally until I had the jallys USB cable plugged into the computer). the dragon draws power from USB so it will come right up. then plug the jallys power cable in.



CLEAR THE JALLY.

my 1.0.0 firmware 5 ghs jally had the security bit set.. which means you cant program it or read the firmware. so to clear it you need to erase the chip. THIS MEANS THIS IS A ONE WAY TICKET.

[THIS SECTION I WILL FILL IN MORE A BIT LATER WITH SCREENSHOTS AND STEP BY STEP INSTRUCTIONS. I DONT HAVE THE JALLY IN FRONT OF ME AND HOOKED UP SO I CANT DO INCLUDE ANYTHING ATM - JUST GOING FROM MEMORY BUT ITS EASY]

fire up Atmel Studio 6.1. hit Tools, Device Programming. under Tool, chose "Dragon" under Device, choose "AT32UC3A1256" at this point it will probably want to flash your dragon to the latest version. let it, it will take a few minutes. when its done, hit "apply", it should read your device signature. then click "read" and all sorts of info should be displayed. youre ready to go. hit "erase" NO TURNING BACK NOW!

PROGRAM IN THE .HEX file

chose .hex image you grabbed before and chose "program" - thats pretty much it. dont even need to compile anything, or even unplug the JTAG cable.. just fire up cgminer and watch it go. cgminer had several false starts initializing it but after a minute or so it dug in and was mining.



stats output after flash:

Code:
DEVICE: BitFORCE SC0x0aFIRMWARE: 1.2.50x0aIAR Executed: NO0x0aCHIP PARALLELIZATION: YES @ 20x0aQUEUE DEPTH:400x0aPROCESSOR 3: 15 engines @ 267 MHz -- MAP: FFFE0x0aPROCESSOR 7: 15 engines @ 281 MHz -- MAP: FFFE0x0aTHEORETICAL MAX: 8220 MH/s0x0aENGINES: 300x0aFREQUENCY: 274 MHz0x0aXLINK MODE: MASTER0x0aCRITICAL TEMPERATURE: 00x0aXLINK PRESENT: YES0x0aDEVICES IN CHAIN: 10x0aCHAIN PRESENCE MASK: 000000010x0aOK0x0a0x00

more later but I wanted to get something up to show how easy it is.

THANKS TO:
danattacker, for leading the way here:
https://bitcointalk.org/index.php?topic=236875.0









17  Other / Off-topic / BFL single - temp vs throttle on: September 16, 2012, 06:37:23 PM
Ive noticed a lot of singles running in the mid to high 50's C. apparently without throttling. but mine throttles around 45 C.

so here are my questions. anyone know where the temp is read on a single? an average of the 2 chips? one chip? somewhere else on the board? what triggers the throttle? hardware errors? an internal temp thats not reported?

background: ambient 70 F (my basement).  originally I ran the 832 bitstream with no problems @ 44 C, but the 864 would throttle withing minutes, even with the temp never getting above 46. so.. I redid the paste with AC MX4 (the stock paste job was horrible, almost lumpy on one chip, and not much coverage on the other) and got a 2-3 degree C drop. loaded the 864 bitstream and it would run about 15 minutes and throttle, with the temp never getting about 43-44 C.

so

upshot is I now run it with a 140 mm fan against it and no sides and it runs at 40-42 with the 864  880 bitstream and no issues.

just curious, mainly.

18  Other / Off-topic / BFL single power supply plug on: September 03, 2012, 02:47:46 PM
What size is the BFL single power supply plug? Im looking to hack an adapter up.

I know cablez makes some sweet adapters but I have everything I need except for the plug specs. Id like to just hit up a local radio shack for it and presto! Im done.
19  Other / Off-topic / BFL single revision level differences on: August 18, 2012, 01:00:19 PM
did a search here and google and perhaps my search foo sucks but I cant find anything on this. what exactly are the differences?

my single arrived. packing slip indicates "Rev 1".

on top, the unit has the gold and silver HSF with the heat pipes. the bottom has a small fan also. so isnt this a revision 3?  revision 1 (the originals) had a solid black HSF with no heat pipes on top didnt they?

auto tune settled on an 816 MH/s bitstream. cgminer says 800 average. @ 73 F ambient, this is withing spec, but Ill pull it apart and redo the heat sink compound with MX 2 later today and hopefully pull better performance.
20  Other / CPU/GPU Bitcoin mining hardware / [POLL] thunderstorms on: September 23, 2011, 03:25:36 AM
simple enough poll.

I always shut down when thunderstorms loom, and easily have lost 10% (see edit below) of my mining and folding time to it. unpowered rigs sit around while we are at work because there is a chance of thunderstorms. they sometimes come, sometimes not. but if the chance is there..

not only that, I even unplug gear from the wall. this despite everything being on surge surpressors and two rigs being on their own UPS.. not that those would stop a lighting hit on a powerline.

EDIT: that 10% figure is the last few month during thunderstorm season. yearly average is about 1-2%

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