Bitcoin Forum

I sent some BTC from one exchange to another and there have been 0 confirmations in over 90 minutes now.  Is that anything to worry about?

I did some very small transactions last night and it took over 12 hours for it to complete...I dunno

your going to find this happening.

with so many high speed miners jumping on each day creating blocks in under 2 minutes, at some point the network needs to even this out to a 10 minute average per block. causing an extremely difficult block to crack just to get things back to normal.

the other part is that mining pools are getting greedy some of them wont accept a transaction without a fee, leaving some transactions in a queue.. so dont expect the 10 minute rule to apply in 98% of cases for your particular transactions.. its the rule of averages, over multiple blocks

Is your transaction consists of many dust inputs and do not have enough fee?

tx id of that transaction?
Well It can be due to many things.. Low priority, low fees etc.

I don't think what you're saying about difficulty is correct. The difficulty does not change with each block but changes every 2 weeks or so. Can someone confirm or deny this?

Difficulty adjusts every 2016 blocks according to the average hash rate over the previous 2016 blocks.  If the hash rate increases above this average, then the 10-minute average time to solve a block will decrease.  For example, if hash rate rises 100% above the previous average, then on average you will see 5-minute blocks until the next readjustment.

This is why we're seeing difficulty readjustments every 11-12 days instead of the predictable 14 at a constant hash rate...network hash rate keeps increasing.

There is also no mechanism that will make a block extra-easy or extra-hard to solve.

It's more likely a case of scumbag MtGox not paying any fees for it's outgoing transactions. It is also preferable, in my opinion, to withdraw money to your wallet first, so you are in control of at least part of the transaction and it's progress can be easily monitored.

Exactly, exchange sites are paying less or 0 fees and their coins age is low.
I did a transaction of 1 BTC and it got confirmed in max 5 seconds.
http://blockchain.info/tx/5958120b3f27279b0e0dfaff4597bfc125612c40501b2a49f24d7fc258858953  (it's showing +1 minute but it took just 5 second)

I think that was because, your transaction got relayed to a miner which at the time either found a block and included it, or you tx got relayed to some other relay that relayed it to a miner that included it in a block . Basically, you were lucky you sent it just before a block was found and a miner included it.

that's nice lol :)

i never said it retargets with every block...

But you did imply that if miners are just very lucky in solving blocks then the network will force a block that is extra-hard to solve, and this is incorrect.  There is no 'need' to even anything out.  We could solve 2016 1-minute blocks in a row and the  network wouldn't give a shit.  Only statisticians would be having a field day with it :D

Really?  Is this what smart people do instead of sending coins from exchange to exchange directly?

Probably very small fees. But you got it confirmed finally, so all good

No, it is normal, it can take a long time sometimes

Especially when you withdraw it from Mt.Gox :P