Maand: september 2014

I have an Ethereum wallet and wish to check if some password was used to create it.
How this could be done?

What happens if a transaction is set to have zero fees?
Can it get into a block?

Also, if you updated a coin’s code to accept zero-fee transactions, would this cause a hardfork?

(e.g. made tx’s in certain denominations return a tx.GetMinFee() of 0)

As far as I understand, Bitcoin transactions include a timestamp, but the only requirement is that they don’t differ for more than two hours.

But why two hours? For computers that are constantly synced via NTP, two hours seem like a very big difference. I would expect that a difference of 10 minutes should be enough.

Or, if this is about time zones and summer time, shouldn’t they be using UTC time?

i would like to know the possibility to use Bitcoin for farmers to change good and services without ever to use of Money. We are trying to set a network between local farmers and would like to use Bitcoin in exchange for our services.

Looking forward to hearing from you.

I’m interested in getting data on bitcoin adoption by country. Is there a way of mapping bitcoin addresses to countries of origination?

I’m compiling on mac, and I get this error:

unsigned char *SHA256(const unsigned char *d, size_t n,unsigned char *md) DEPRECATED_IN_MAC_OS_X_VERSION_10_7_AND_LATER; 

Why does this happen, and how do I fix it?

If we take block hash 0000000000000006770c3806960539ca83a24facbd99ea212f37f2a0e6a5629a for example.

The difficulty as a 32 bit float is 50810339.04827648. The difficulty in bits as an unsigned 32 bit integer is 424970034?

What are the equations to go from difficulty -> bits and bits -> difficulty?

Is there a library which exposes order-book and trading functionality of major exchanges like BTC-e, Bitfinex, Cryptsy etc. ? I know these site have their own API but I wanted to re-use the code, if some sort of library is already available.

I am looking for a java library in particular.