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1  Bitcoin / Development & Technical Discussion / Early bitcoin mining and unique addresses on: May 21, 2014, 01:14:54 AM
I am interested in the process followed during the early days of bitcoin mining - back in 2009, 2010.
I understand that mining was performed on home computers, and the difficulty level was obviously much easier than now Smiley
(and the block reward was 50 btc)
What I do not understand is why each block that was mined back then seems to go into a new, unique, bitcoin address?
For instance, look at block 1001
The block reward went to address 1FJNKtXWjbNA1TBzCyTEnoMEbC8XsFPmFF
This address is never re-used. (afaik)
Look at block 1002, 1003, 1004, etc. They all are associated with new addresses.
I have (just manually), clicked through dozens of those early block rewards, and none of the addresses seem to be ever re-used.
Surely if there were only a handful of miners back then, each miner would have only one address that the block reward would have been being sent to? Why do none of those early bitcoin addresses have more than one block reward added into them?
Can anyone explain?
If I had done some bitcoin mining back then, would I have a unique bitcoin address that contained the sum of my mining efforts?

2  Bitcoin / Development & Technical Discussion / Unconfirmed Transaction. 2.0 btc bounty offered for recovery on: February 19, 2014, 08:08:10 AM
As part of my life as Dave Bitcoin at walletrecoveryservices, I receive a variety of strange requests. Here is one::::

I have received a bitcoin-qt wallet from a client, that appears to show an unconfirmed transaction credit from the 2nd of December 2013, for 10 BTC.
You can see it at

The transaction id is
and the amount is

I offer a bounty of 20% of the amount (ie 2 btc) to whoever can first make this payment confirm. (my client will benefit, I will benefit, and one of you will benefit Smiley

Now, I can't find this transaction on the blockchain, so presumably it either never existed, or it was included in a block that was gazumped. However, if the source data for this transaction were to be located, and replayed into the network, could it then be included in the blockchain? Does anyone keep records of transactions that were broadcast, but never made it into the 'longest' blockchain? Did something funny happen to the bitcoin network in early December 2013? Is this an example of transaction malleability?

There is also the distinct possibility that this wallet is actually a litecoin wallet, or dogecoin, or whatever. (is there any way of telling, from the wallet.dat file?) Or maybe the wallet was operating on testnet?

Any help or suggestions would be appreciated.

3  Economy / Service Discussion / encryption on: December 09, 2013, 10:34:50 PM
I'm trying to understand/duplicate the second-level password encryption used at the site.

Their site says that the dpasswordhash value is calculated as 10 rounds of SHA256 on the sharedKey plus the secondpassword.
var dpasswordhash = Crypto.SHA256(sharedKey + secondPassword);

However, when I try to duplicate this functionality, I get a different dpasswordhash value.

Has anyone got some pseudo-code that can show this working (and actually getting the correct dpasswordhash value)?
(I can't make much sense of the javascript available at their site)

I've tried various things, such as using command line openssl, as per
openssl dgst -sha256 -hex -out tempout.txt tempin.txt

or similar, but I can't get the right answer Sad
Thanks for any advice!
4  Economy / Service Announcements / Bitcoin Wallet Recovery Services - for forgotten wallet password on: June 22, 2013, 07:51:25 PM
I have put together a service to help you recover your wallet password (for your encrypted bitcoin wallet) if you have forgotten it.
Refer to
I hope this will be useful to someone.

(and before you ask, no, this isn't a scam to steal your bitcoins! Smiley)
5  Other / Beginners & Help / Bitcoin Wallet Recovery Services on: June 21, 2013, 08:39:18 AM
I have put together a service to help you recover your wallet password (for your encrypted bitcoin wallet) if you have forgotten it.
Refer to
I hope this will be useful to someone.
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