If the number of seed words is 2048 then there are 2048^12=(2^11)^12=2^(11*12)=2^132 ~= 5.4*10^39valid combinations

that is not attackable by a brute force

How do you pay fees for sweeping old private keys into new Electrum wallet?


I have an old wallet.dat from 2014 bitcoin-qt (0.8.5).

Followed the instructions on https://en.bitcoin.it/wiki/Transferring_coins_from_Bitcoin-Qt_to_Electrum

• Generated private keys from the old wallet.dat
  
  Installed Electrum 2.8.3, made new wallet with seed
  
  In Electrum Wallet->Private Keys->Sweep
  
  Entered private keys, left default receive address and pressed Sweep
  
  Transaction Report was generated by Electrum and the amounts appeared to be correct (for 2014).
  
  Saved Transaction in signed_xxxxxx.txn file
  
  Then Closed.
  
  Now nothing is happening in the Electrum receive address.
  
  Blockchain.info is showing the receive address as being unused.
  
  Still have 0mBTC in the new Electrum wallet.

So my question is shouldn't have I had to pay some fees for sweeping these private keys?

How do I ensure that the sweep gets added to the blockchain?

PS Electrum client has the default dynamic fee structure.

EDIT: Had to BROADCAST the transaction  

Sitting Unconfirmed right now.

Still not sure how the fees get applied, surely miners are not going to sign my 2kbyte transaction out of goodness of their heart anymore...

EDIT2: Okay, got 1 confirmation already and it appears a fee of 291.594 sat/B or about 18USD was paid automatically by Electrum. Still wondering how that was determined.

I am curious how your design would compare to current FPGA champ according to https://en.bitcoin.it/wiki/Mining_hardware_comparison#FPGA_Devices

As of this writing best perfomance seems to be around 110 Mhash on a $299(academic) Terasic DE2-115  dev board.

I think a worthy goal would be adopting your design to a lower cost board and finding a sweet spot for perfomance/price.

Bigjake, take it from someone who has been running pitiful ~200Mh/s for a month on a Radeon 5770: it really is not worth it anymore(after substracting electricity costs of running my PC 24h at full blast, I end up with about $15 a month) mining is moving towards most efficient producers - meaning those who can build the most cost effective mining rigs and who have to pay the least on electricity.

Rest of us would basically be mining for the fun of it. You would fall in this category, since if it takes you a few days to get 0.001BTC figure on a few years to get 1BTC even if no difficulty changes, which is highly unlikely. CPU mining is not really viable anymore, especially considering the power demands. The current golden standard is GPU mining.

If you live near cheap electricity, then you may consider building your own high power rig.
Take a look at this page:
https://en.bitcoin.it/wiki/Mining_hardware_comparison

Pretty much anything else is currently not viable (except those lucky few with access to already paid for FPGAs).

If you want a bare minimum starting graphics card to stick in your computer I would say go with 5770 or 5830, worst case scenario you got a good graphics card for your computer.

IMHO, getting 6970 is kind of risky right now, unless you are a hard core game who can utilize it otherwise.

Just hit this restriction today when I attempted to post on mining hardware forum some information about FPGAs, which is kind of silly to post in the newbie section.

5 post restriction is very fair, I believe 24 hour restriction on posting elsewhere would be fine too (of course being a member for a month I may be biased ).

Went from 193.7Mh/s to 195.1Mh/s on my 5770 (900/600) after I edited BitcoinMiner.cl and restarted guiminer.

 running guiminer phoenix.exe VECTORS BFI_INT FASTLOOP=false AGGRESSION=12 -k phatk WORKSIZE=128

Hmm, but now has rate has actually dropped into 186-188 range, not sure what is going on.

Axel,
  Can you provide the link to that Spartan 6 board with 150 LEs ?

I've been around Trenz site a few times and have not noticed that particular board.

Is this the one you have in mind?
http://shop.trenz-electronic.de/catalog/product_info.php?cPath=1_65_143&products_id=917

What is confusing about the above one is that title says:
Trenz Electronic GigaBee XC6SLX150
yet  Key-Specifications say:
 Industrial-grade Xilinx Spartan-6 LX FPGA micromodule LX100

Also, I suspect you will not be able to use free Xilinx WebPack on LX150...

On a related note about CPU utilization, I am just playing around with CPU mining and would like to set the CPU utilization at around 70-80%, is that possible from command line ?

at 100% CPU runs too hot

I assume on a dual-core 4 thread setup like mine I could just have it run on 2 threads, but that would be 50% utilization..

Just would like to get my miliBTC first before I start on GPUs

I just downloaded the client (0.3.22-beta) and the block download has really slowed down to a trickle.

The first 50,000 dowloaded in a few minutes but now its been 30 minutes for the following 20,000 (around 73,000 blocks now). Still showing 8 connections

Is it because the "newer" blocks are bigger?

PS This is on 100/50 Mbit connection