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1  Bitcoin / Development & Technical Discussion / Why does the difficulty change every 2016 blocks but not 2000 or 2100? on: October 31, 2016, 03:17:09 PM
I know 2016 blocks is roughly two weeks, but why did satoshi chose this connection of the protocol to the 'real' world?
I mean, for me it would make some sense to make it sync with the block reward period which is 210000 blocks.
2016 is not a factor of 210000.

Was this done deliberately? Yes, of course it was, but why?
Was this number chosen as some sort of 1337 hint to this 2016 election year?

Why did Satoshi not sync this to the block reward period and use 2000 or 2100 blocks(which are both a factor of 210000), which 2000 as most obvious round number.

Since bitcoin is a global internet phenonemon it doesn't make sense to me to sync the difficulty adjustment with 2 earthly weeks.

Personally I stick with the 1337 explanation until I see another reasonable explanation.
2  Local / Meetings (Nederlands) / Halving party on: July 07, 2016, 07:47:32 AM
Is er dan echt nergens een halving party in Nederland?

3  Bitcoin / Bitcoin Technical Support / Change address on: July 05, 2016, 09:04:17 PM
So I did
importprivkey "private_key_from_weak_brainwallet"
in my bitcoin core console.

I know it's a weak key but it was for testing purpose only (1mBTC)
Now, is it possible that the wallet *ever* use this address again as a change address?
Because I don't want this address being used ever again since it's weak.

I thought I better change my mind and *export* the key, but I there doesn't seem to be an option for it.

So, edit with pywallet? Or just create a new wallet and make a transaction to it? Or just don't worry?
4  Bitcoin / Bitcoin Discussion / Best way to make your bitcoin redeemable by hackers on: June 09, 2016, 08:18:58 AM
I want to put some bitcoin in digital places where I have stored some sensitive documents.
I figured that the best way to know if some hacker/script was able to reach that place was to put some bitcoin in the same folder.
But I would like to make it as easy as possible for the hacker/script to redeem that bitcoin.
What should I do? Just put an unencrypted wallet.dat with some bitcoin in the same folder?

On the other hand it's not a guarantee that the folder is not reached when the bitcoin is still there.
I have a bitcoin private key QR code on a *very* public place somewhere on the web and it's still not redeemed after months.
There is 0.0161 on that QR code.
5  Bitcoin / Mining / How do you calculate current network hashrate on: May 24, 2016, 02:39:12 PM
I see different charts:

How is the current network hashrate calculated?
You probably need to take an average from the latest n blocks?

Nevermind. Found it
6  Bitcoin / Bitcoin Technical Support / What is the easiest way to generate a few dozen addresses with tiny amounts? on: May 09, 2016, 08:46:53 AM
I rather not want to do this manually.
Obviously, I also would like to use open source solution only.
7  Bitcoin / Bitcoin Technical Support / Do pruned nodes store the UTxO set and can they serve SPV wallets? on: May 03, 2016, 08:39:36 AM
I have a pruned node and would like it to serve my android bitcoin wallet exclusively. That means, the android wallet should not connect to any other node. I have 50 connections on my pruned node on avarage.
The android wallet dev says pruned nodes cannot serve SPV wallets because they do not have a full copy of the blockchain.

Why does a SPV wallet need something else than the UTxO set?
Are pruned nodes storing the complete UTxO set at al? Or only last n blocks?

8  Bitcoin / Bitcoin Technical Support / Multisig bitcoin address also a litecoin address on: March 20, 2016, 11:01:42 PM
I don't understand.

I was dreaming away looking at the bitcoin balances on this page and deciced to put some addresses into google and see if there is something known about the owner of these addresses.

The second address I tried was kind of strange. It starts with a 3 (just like some others) indicating it's a multisig address.
But when I got googles result, I saw it's also used as a LiteCoin address!  Huh Huh

Bitcoin address balance:
Litecoin address balance:

How can an address be both a valid litecoin address *and* bitcoin address.
This *can't* be a vanity address.
It can't be luck either,.. I suppose.

So, it should have something to do with multisig, right?
9  Bitcoin / Development & Technical Discussion / Retrieve lost satoshis on: November 09, 2015, 11:45:01 PM
So I was playing around a bit and lost some relative small amount of bitcoin
I used a certain method to create the public key, but I don't have it anymore.
Now I dug into python (which btw is new to me) and was able to produce a script which is able to give me a few thousand (perhaps few million) addresses of which one of them is the one I used.
In other words, I'm able to brute-force the private key because I know the pattern I used.

I exported first 200 addresses with my script and tried to import them into multibit classic.
This works, but is very slow.

Is there any other (more efficient) way to check balance of the keys?
10  Economy / Goods / I'm looking for bitcoin promotion business cards on: September 10, 2015, 10:06:09 PM
I want to have some bitcoin private key cards in my irl wallet to hand out to interested people or charity collections.
I prefer plastic or plasticized cards, standard business card size.

Preferable these cards have a scratch layer to reveal the private key for spending.
Public key should be visible all the time.
Cards should be unloaded, I will do that myself when necessary.

I've searched the internet, but I could only find preloaded (high value) gyft cards.
I want to load them myself with some dust.

11  Bitcoin / Bitcoin Discussion / How many coins are proved to be in possesion of governments? on: August 30, 2015, 07:07:04 PM
We all know about the silk road story and USG seizing 144.000 coins from DPR and some 30k coins from the market place.

I've got two qestions:

How many of those coins are still not auctioned?
Are there any other stories of governments owning bitcoins?
12  Bitcoin / Bitcoin Technical Support / What is the safest way to convert a base6 number into a WIF private key? on: August 27, 2015, 11:36:49 AM
So I'm planning to throw 99 times with a dice and punch the number into a metal strip or engrave it into marble to produce some bullet proof single address wallet.

Before I go such lengths I want to make sure this approach works. So I want to test each step and even fill this address with a few satoshis and spend them as well before I fill it with more serious amounts.

Throwing a dice is easy, but converting it into a WIF private key isn't.
The only way I found is through, but I am not able to review the source and I don't want to rely at one source only.

Is there anyone who can give me some other suggestions?
13  Bitcoin / Armory / Failed to verify deb package signature on linux mint on: August 26, 2015, 07:26:18 PM
So I followed the tutorial at

I downloaded armory 0.93.2  for ubuntu 32 bit and did what was written.
Everything goes ok, except the last thing

When I do:
dpkg-sig --verify *.deb

I get:
Processing armory_0.93.2_ubuntu-32bit.deb...

But no result.

What is going on?
I had no errors while doing
sudo apt-get install dpkg-sig
14  Local / Nederlands (Dutch) / Bitcoin speculatie draad on: July 25, 2015, 08:47:24 PM
In eerste instantie een thread met een vraag over een halving party, maar het is uitgegroeid tot een speculatie thread.
Ik heb daarom het onderwerp veranderd

Dit was de originele vraag, ooit:
Het zou mij leuk lijken om het moment van de bitcoin halving een feest te hebben.
Zijn daar al plannen voor? Eventueel ergens in duitsland of belgie ofzo?
15  Bitcoin / Bitcoin Technical Support / Running a Bitcoin Tor exit node on: May 29, 2015, 07:01:55 PM
So I'm running a tor relay node from home for a while and was tempted to be an exit node.
You might be familiar with the raid stories from people running an exit node.
Now I know port 80 and 443 are popular exit ports, but what would be the risk of running a bitcoin exit node?
I already activated my node on 8332-8333 to be an exit but did not have any traffic on it yet afaics.

What risk do I take other than possible bandwidth complains from my ISP?
I mean, I also have free 2.4 an 5 GHz Wifi enabled on my router (limited bandwidth and no access to LAN)

16  Bitcoin / Bitcoin Discussion / How can I easily put readable quotes into the blockchain on: February 19, 2015, 09:21:00 AM
Sometimes I dream and have great ideas, well, at least I think they are.
Most of the times I don't have the time or capital to work them out so they are put aside and I move on.

But since I think they are good, I want to preserve the ideas and make them public without the risk of them being destroyed.

And then there was the blockchain, perfect!

Now, how can I easily put some text into op_return with a transaction?

17  Economy / Service Discussion / Recurring monthly bitcoin payments on: February 15, 2015, 12:06:21 AM
Is there a wallet which can do recurring montly payments to certain adresses?
I have a few projects/organistations I donate to once in a while but the list is growing and I would like to automate it.

I could not find the option in multibit and as far as I know it is also not possible in bitcoin core.
18  Bitcoin / Project Development / Peg a video timeline to the blockchain on: February 14, 2015, 08:33:10 AM
There are so many fake videos in this world.
I even think that a good load of videos on MSM are fake.

One way to prove that videos are real would be to peg the video timeline to the blockchain, right?

For example; A video could be proven authentic when every few frames there is a timestamp made on the blockchain which could prove there was no time in between several frames which indicate that CGI or cuts were not done afterwards.
You could for example sha256sum every few frames and use them as an address. I think it might even allow for some re-encoding for the video while keeping the sha256sum intact.

I think this idea is feasible.
I would even want to pay for such service to prevent bullshit from entering my head.

If someone is going to develop such a service, you could later donate a few thousand BTC to my address in my profile page when you sell this idea to youtube. Wink
19  Bitcoin / Bitcoin Discussion / Poll: How often do you check the price of bitcoin. Please VOTE on: February 13, 2015, 09:36:28 AM
Please do not give your answer in a reply to this thread. Of course we can discuss the topic, but make sure you vote first.

9 months ago I had exactly the same poll but I would like to know the current sentiment and compare them. I locked the previous poll.

So please vote, thanks.
20  Economy / Speculation / I get the creeps of the fractal behavior of bitcoin. on: February 04, 2015, 07:16:51 PM
Last few weeks the price follows a perfect fractal movement, it's insane.
I traded on this behavior and made profit.

Why does it behave like this?

Do we really live in a simulated universe like some people suggest?
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