I'm in London, UK.  My electricity costs me £0.1155 per kWh plus a £0.35 daily charge.  I mine at about 2.5 mh/s and estimate my electricity costs about £3 every day.  I probably make about £4 a day (even less the last few days since BTC dropped in value).  So there's your answer.  £1 per day in profit.  Hardly worth it, but I'm doing this hoping that BTC (and other alt-coins) will go up in the future, not for immediate gains.  A massive risk of course, but hey, we'll see.

EDIT: forgot to mention heating.  My rig's actually been heating my flat since early January when I began this whole thing.  I actually switched my heating off soon after, so there's a small saving there too.

Hi, in the last couple of days (roughly), I'm seeing much higher reject rates than before.  It used to be around 0.6-0.9%, and now it's about 2-4%.  I haven't changed any settings on my end and I've restarted my rig a couple of times.  BTW, I'm not referring to the change that happened a couple of weeks ago.  I did reduce the intensity on my cards following that, which lead to the 0.6-0.9% rejects as mentioned earlier.

I do read this thread regularly, and saw a couple of people mention higher rejects recently, but haven't yet seen anyone comment or offer a possible explanation.  Just wondering if Waffle changed anything or if there's another reason, and if there's anything we (miners) are supposed to do?

Thanks.

Yep, I think I got it now. Thanks for the help.

Thanks everyone, this is all very helpful.

I think I wasn't fully understanding what the backup was actually doing.  If I understand it correctly now, all it does is enables me to gain access to the balance of bitcoins held in the wallet address that Mycelium uses.

Thanks again.

Hi,

I apologize in advance if this has already been asked and answered before (and also for the noobness of the question).  I tried searching, but wasn't able to find a definitive answer to what I would like to ask.

I installed the Mycelium wallet on my phone.  I created a PDF backup, then verified it (successfully).  This is all before I transferred any funds into my Mycelium wallet address.  I then transferred a small amount into it, and it's showing as successfully received.

My question is, if I ever lose my phone, it's stolen, or anything else happens where I need to use the backup PDF document I created in a fresh installation of Mycelium, will the restore procedure always restore the most current amount of bitcoin associated with that address, or is the backup a snapshot of whatever the balance is when the backup is made?  I doubt it's the latter, but need to verify and make sure.  If it was a snapshot, then that would mean I'd have to create a backup every time my balance changes, and that seems very cumbersome.  I hope what I'm asking is clear.

Many thanks.

Vlad.

Thanks for the further clarification Waffle, makes perfect sense.  And thanks for all your hard work! 

Thank you!  Feeling silly for missing that bit.    It's just that it's never happened before (and I imagine I always have some positive balance, and have been mining here nearly from the beginning), so that's why I thought it was out of the ordinary...

Waffle (or anyone else),

One of my recent payments (at approximately 18:00 (GMT) yesterday, 16th) was for 0.005, which is less than the usual threshold of 0.01.  Not complaining or anything, just curious why this happened.  Don't worry if you don't have time to explain, I don't have a problem with it at all, was just wondering. 

Has it happened to anyone else?

Thanks Abdussamad and dabura.

Thank you Abdussamad!

So, if anyone ever sent me anything to one of these "used" addresses, I'd still receive it?

Update:

I've managed to send now.  The reason the "suggested fee" was wrong is my own fault, when I first installed Electrum I modified the transaction fee setting under preferences (before I knew anything about it) and set it too low. 

Now I have a further total-noob question.  This was the first time ever I sent any BTC, so far, I only received, from a multipool I mine at.  I just made two transactions.  One was a donation to a guy who runs a cool stats site.  The other one was to myself.  What I did was sent a tiny amount (just over 0.01 BTC) from one address, to another address of mine which contains the bulk of my balance.  I wanted to "consolidate" my balance, which was split between three addresses.  After I did this, the address that I sent from disappeared out of my list of addresses in Electrum (and I think another new address got automatically created to replace it).  This is where I'm confused.  I read on BTC wiki that BTC addresses are one-time-use only, and it literally says: "Unlike postal or email addresses, Bitcoin addresses are single-use. This means that whenever you want to receive a payment, you need to generate a new address.".  I don't understand this, as I'm using one address on this multipool, and I'm receiving payments to that address every day.

So what I'm wondering is, now that the address I transferred the entire balance from has disappeared, what's "happened" to it?  And also, what would happen if anyone ever tried to pay me to that address?  Would the payment "bounce"?  Or just vanish, and neither the payer nor myself would have it?

Sorry for the noobness of these questions...

Thanks.

Hi,

Whenever I try to send any amount from my Electrum wallet, it fails, and it's because of the fee.  The question mark button next to the fee field says that a "suggested fee" will be automatically input.  So I leave it alone, and don't try and change it to zero, nor do I try to input a higher fee.  But whenever I try to send, it tells me the fee is too low, and that I can't send because the network won't propagate it.

So how is this "suggested fee" that gets automatically input calculated, and why is it wrong?  How do I know what fee I'm supposed to set?

I read up about fees, and think I understand the basic concept.  If I understand correctly, the fees will be higher if my received transactions (that make up my total balance) were very small, and in particular if any of the receive transactions were under 0.01 BTC.  But none in my wallet were.  They're all between 0.015 and 0.06 or so.  There are many of them though (about one a day, for the last month or so).

Thanks in advance.

Vlad.

Working great after the update, thanks!

Here you go, thanks.

Very useful, thanks for creating this.

I have a tiny issue.  In portrait mode, the last line of text (App Update: ...) is cut off, and only the very top of the letters is visible.  It's fine if I rotate to landscape.  I'm using a Sony Xperia Z1.

Thanks again.

Everything working great, and awesome ping from here (London, UK):

Pinging eu.wafflepool.com [95.85.28.31] with 32 bytes of data:
Reply from 95.85.28.31: bytes=32 time=17ms TTL=51
Reply from 95.85.28.31: bytes=32 time=14ms TTL=51
Reply from 95.85.28.31: bytes=32 time=14ms TTL=51
Reply from 95.85.28.31: bytes=32 time=14ms TTL=51

Ping statistics for 95.85.28.31:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 14ms, Maximum = 17ms, Average = 14ms

Thanks for all the hard work Waffle!

@tblack and The Fat Miner.

Intensity is 13 (it's a 280X card, and 13 seems to suit it well).  I can do pretty much everything else (bar watch full-res youtube videos), and it works fine, it's just that I recently noticed this issue with Chrome.

Another forum member helpfully PM-ed me and also suggested switching HW acceleration off, which I've done, and it's helped a lot, although it's disabled some things in Chrome (Google Maps are now in "Lite" mode, for example, no 3D imagery).

I thought it would be great if I could set it all up so that the integrated graphics is used for desktop, browsing, etc, whilst the 280X mines unhindered, but not sure how to go about setting this up.

edit: Oh, I think I know what you meant tblack.  Just connect the monitor to the integrated graphics DVI, as opposed to the 280X.  Simple.   I may well try this.

Thanks. 

Perhaps slightly off topic, but just wanted to check if anyone's come across this...

My main PC (this one I'm reading this forum from) uses Windows 7 SP1, and cgminer 3.7.2 with CGWatcher.  It all works fine, but recently I switched to using Chrome (having used Firefox before), and have now noticed that whenever I maximise (or have it open in a window - not maximised) Chrome, my hash-rate drops significantly.  Normally, it's at around 745 Kh/s, and with Chrome on top, it drops to about 680-700.  Minimise Chrome (or shut it down) and the hash rate goes straight back up, nearly instantly.  It's repeatable, and it's definitely Chrome affecting the hash rate.  I haven't noticed this with Firefox, but the reason I switched to Chrome was my tabs-fetish was getting out of hand (I was using groups in Firefox, and had something like 40-50 tabs open per group and about 5-6 groups, yes, I know, insane  ).  So now I'm trying a tab-diet, and have only about 20 tabs open in Chrome, but it's doing this weird thing.

Has anyone come across anything like this, anyone here specifically uses Chrome and CGWatcher/cgminer, and can perhaps do a quick test?

Weirdly, I googled this, and found a couple of threads on other forums where people were experiencing THE EXACT OPPOSITE issue, in that their hashing rate INCREASED when they had Chrome open, and would drop with it minimised or closed.

 

P.S.  Waffle, you rock.

Dabura, thanks VERY MUCH for that detailed explanation.  I'll have to carefully think about it all in order to process and understand it all properly.  Man, I can't believe how complex all this stuff is - and I've actually been using computers for decades - imagine someone who isn't even comfortable using a computer yet.

One thing you said worries me slightly (although I have a feeling it's probably ok, and I'm only worried because of the lack of understanding).  You said a lot of people lost coins because of not understanding the stuff about unspent balances and change addresses, and by backing up their entire wallets.  This is something I've been doing.  A simple automated backup that backs up files and folders on my PC on a regular basis.  This now includes the Electrum folders and the wallet file.  Should I worry?

I have an Android phone, so have just downloaded the Mycelium app (I've previously had the "standard" Bitcoin app on my phone, but have never used it yet. I assume Mycelium is a better/more secure version of the same thing?).  I'll try and make some time this weekend to hopefully set all this up.

Thanks for your help.