Lets say for whatever reason (deliberate or accidental) Bitcoin hardforks into two chains.. I have 10 bitcoins in my wallet, on chain 1 I would like to send those 10 bitcoins to address 12345 and on chain 2 I would like to send those same 10 bitcoins to address 19876..

Assuming both chains have nodes still relaying txs amongst both chains, how do I prevent the first tx from being applied to the 2nd chain accidentally? 

Is there a way to specify to only include this tx if block x hash = <some known hash>?

Any other way to keep the tx on one chain and not the other?

For those who haven't seen the new DAppStore.. http://dappstore.dappcentral.com

If you want your favourite alt-coin added to the DAppStore then I am offering a service to do it on your behalf. Currently adding a new DApp costs 1000 DSV each, I will cover this cost and accept payment in your chosen alt coin (starting off at $10 USD converted to alt coin)

If alt-coin lead developers want to put their hands up for DSV, I will send them some DSV for no charge so they can manage their own submission and voting.

Note: DAppStore is still Alpha, Its not decentralized yet, only one node, there also be bugs!

Years ago I created a website called bitcoincounsel.com, that was a directory of all Bitcoin related websites/businesses and just like nearly every other bitcoin directory out there I lost motivation in keeping it updated.  So I have created a decentralized DAppStore that not only includes Bitcoin and its related websites/businesses but also caters for the larger DApp ecosystem in general.

Think of this project as a cross between App Stores like Apples AppStore and the Google play store and Coinmarketcap.  It can be used to both advertise your project and provide reviews and rankings on related projects.

The DAppStore introduces a new token called "DAppStore Votes" or DSV, these votes are used for various functions in the DApp, but primarily they are used to cast votes towards projects of interest. Votes when cast are locked and cannot be used, but can easily be unlocked to be transferred or sold.

Its still early alpha quality code right now, although there is a live GUI you can try out here: http://dappstore.dappcentral.com/

It includes not only crypto-currency projects, but other DApps like BitMessage and TOR for example.

I'm aiming to release the full node source code in the next few weeks.  In the meantime, try out the demo GUI, get voting for your favourite DApps

So I have launched a new website focused on building and supporting the Decentralized App or DApp ecosystem.

http://dappcentral.com/

I have already listed a bunch of DApps ranging from Bitcoin to Tor, I know I could add each and everyone of the 500 odd crypto coins but I cant be bothered right now so i'm looking for non alt-coin apps.

Any suggestions for big name DApps i've missed?  And by DApp I mean a decentralized app that enables user to user or peer to peer collaboration / cooperation without any centralized middlemen or 3rd party.

I'm just going over some options of ways a crypto-coin developer can earn some money for their hard work and potentially keep them incentivized to continue working on it.

So which of the methods below are more acceptable to the crypto community?

• Developer allocates 100% in the genesis block to themself, keeps a portion and promises to distribute as they see fit
• Developer allocates a small % in the genesis block to themself, remainder can be mined (whats an acceptable %)
• Sell shares in exchange for BTC like an IPO, and then distribute initial coins based on IPO allocation. Developer would buy large stake
• Protocol hardcoded to send a % of new coins/transaction fees to developers address
• Built in voting system to allow new coins/fees to be allocated to contributors
• Protocol hardcoded so any donations sent to developer pre assigned address give donors slight advantage/privilege over non donors

Or any other suggestions?

My very rough estimate is that Bitcoin is currently 80-90% speculation and maybe 10-20% trade/commerce etc

In addition to being a store of value, I think a currency really needs some commerce, trading, bartering etc to provide a true price discovery and help stabilize the price, it gives it some utility, keeps it in everyone's face on a day to day basis.

I think Bitcoin would do better if it was a 50-50% spit..

Now we've got these alt-coins going nuts, with just about all of them increasing 100-200% in the past few days. I mean "InfiniteCoin" has doubled in value?? really? I thought we were trying to avoid the QE.

These alt coins are so far removed from any real price discovery that who knows what the real price is. I mean 1.2 billion dollar market cap for Litecoin, seriously? 

Satoshi started with a nice premise.. stop the inflation, lets have a currency limited to 21 million units. but now the greed has taken over and people are buying anything and everything and pumping the shit out of it trying to boost the price.  So now our 21 million units is now 21m + 84m (litecoin) plus billions more spread across 40 other alt coins.  In our greed we've collectively become our own Ben Bernanke..

Then you've got the likes of Max Keiser relentlessly pumping Bitcoin, and now pumping Litecoin (right after he bought a shitload no doubt).  I mean within days of his price prediction for Litecoin the price rose to with $1 of his target.. Its clear as day he is leading the herd on that one, and he is having a similar effect on bitcoin prices.. i mean would it hurt to say "Now prices will consolidate for a while".. no need to pump this thing like silver..

The world of decentralized crypto-currencies is determined by consensus.. if we collectively agree that 21 million units is not enough then we will all adopt more altcoins and increase the number.. but I liked the 21 million idea, i'm going to cast my vote for just one, Bitcoin, and to support that I will only shop with merchants and exchanges who deal in only Bitcoin.  If a merchant chooses to accept other altcoins then you've lost my business.

So join me in casting your vote for Bitcoin, shop where Bitcoins are the only cypto currency accepted.

/rant

So BTCChina, the market leader who has been driving the price higher and higher is now offline.

Either..

a) Surge in demand killed their servers
b) Decided to call an end to the pump and dump

Anyone know of retailers accepting bitcoin selling them?

millenius.com.au has the older stock, but i'd prefer the new ones.

Not really bitcoin specific but i'm sure there are lots of people running bitcoin on linux boxes and want to run a tight ship in regards to security.

So I have put together a firewall monitoring web based script running on PHP, requires ulog2, mysql (at the moment) its pretty straight forward.

I found there is a distinct lack of decent monitoring tools, especially anything updated in the last few years.

Anyway, check it out if your interested.. it's still pretty Alpha at the moment.. https://github.com/slothbag/fwlogview

If you want to see it improved, send a small donation

Can I get an idea of how many users here have managed to withdrawal bitcoins from BTCChina within the last week?

I just want to verify they actually have the bitcoins and are paying out at these prices?

Am I missing something here..  apparently BTCChina has zero cost trades at the moment, I haven't confirmed this myself, but doesn't this enable huge opportunity for market manipulation?

1. You can run up the exchange volume with your own bogus trades.. so the Volume metric becomes pretty much useless.
2. Whats to stop someone repetitively trading with themselves for no cost and push the price anywhere they like?

I don't like this zero fee model, trading should be restricted to only people who actually need to trade and/or are willing to pay for it.

Hi All,

Any C# guru's want a quick job?  I need signmessage and verifymessage implemented, BitcoinJ code is in place, needs translating into C#.

Check out this C# project on GitHub  https://github.com/slothbag/BitcoinCryptoTest

File ECKeyPair.cs lines 90-200 have been commented out, they are a copy from BitcoinJ and obviously don't compile in C#.

The first to make this very simple program sign and verify messages compatible with Bitcoin-QT there is 1 BTC for ya.


The existing C# code is from mb300sb and his excellent C# library here https://bitcointalk.org/index.php?topic=148163.0

Update: I am cancelling the bounty for this due to lack of interest.

Can anyone lend their crypto expertise.. is it possible to create a M of N multisig transaction with say 50 participants and have them send coins to an address that no one can spend from, then choose one of the 50 to be the recipient and allow the remaining 49 to sign over the funds and the final recipient decodes the priv key to spend.

This needs to happen over a trustless p2p system like bitcoin..

Questions:
* How to create a priv key/pub key that none of the 50 can spend from
* Does the 50 participants have to sign one by one in a specific order to create the key?

https://coinjar.io/about

And he's selling Bitcoins CHEAP!

Hi,

I need to perform the bitcoin message verify routine in a PHP app.. I tried to use the mdanter phpecc library https://github.com/scintill/danter-php-ecc but its a bit beyond me.

Anyone know of an easy to use library for PHP that I can utilize to perform the verify?  I just want to pass a bitcoin public key, text and signature and get a true or false back.

Failing any such library in PHP, I could probably use a Nodejs or Python or even Mono C# as an external process if need be.

I dont want to use the bitcoind process as I dont want it to sync with the network and I dont need it running 24/7.

Any help appreciated.

Cheers

Ignoring the current sillyness going on with the bitcoin price I wanted to discuss the effects of excessive money printing on the bitcoin price.

The US is currently printing $85billion USD a month in Quantatative easing, if I was the banks receiving this free money, why wouldn't I invest some or all of it into an asset that cannot be artificially increased like bitcoin.  I mean any bankers that did this would come out with far more purchasing power than the ones that just kept holding USD that are continuesly worth less and less.

So given it makes financial sense for bankers to convert their newly minted USD into bitcoin, lets assume all of them start doing it.  It makes sense, that way no one is left behind.

So $85B a month is $2.7B a day, divide that over the 11M current bitcoins in circulation and that works out to about $254 dollars a day the BTCUSD exchange rate needs to increase to accommodate all this new money.

Let me repeat that.. thats $254 a DAY increase in price of bitcoin.  Our recent high was only worth 1 days money printing.

Lets not forget that bitcoin is a global thing, so we can add Japans $60B a month too.. so that would take the daily increase to $433 a day.

Bitcoin is here to save us from the unlimited printing of fiat.. Everytime bitcoin holders sell for USD with the sheep causing the exchange rate to drop you are assisting Helicopter Ben and making it harder for bitcoin to succeed in its goal.

I think if Satoshi had created bitcoin with 1billion or 1trillion base units instead of 21million then we would see less wild price swings.

Think about it, if the early adopters bought at 0.000001, and the first bubble was 0.000031, and the recent ramp up was 0.000266 then it doesn't sound like that big a deal.

The price per bitcoin in usd even though arbitrary is a psychological factor.

I guess the difference is the current method is great at promoting value and growth compared with other currencies metals and stocks etc, but also bubbles.  Whereas a much lower rate would maybe not attract enough attention quickly enough to catch on.

Thoughts?

A friend of mine has just launched a new hardware product for the sim racing scene, it's seriously cool and a very reasonable price.

It's a completely custom designed and built product, he has just started selling the first production batch.  Be quick if you want to secure one.

Check it out here: http://siminstruments.com/

He has said he will accept any orders paying with Bitcoin, so either send an email with your order details to their contact email address, or just let them know you want to see a Bitcoin checkout option on the website.  Maybe if there's enough interest they'll add it.

There's a good review here: http://transtasmanracing.com/partnership-announcement-siminstruments/

Happy racing.

A friend of mine is about to launch a new hardware product targeted at sim racers and i'm trying to convince him to accept bitcoins for it..

Can I get an idea of how many iRacing fans we have on these forums and would you be willing to spend a btc or two on gaming peripherals?

I'd like to propose a P2P yellow pages style business directory.  Let me explain the why and the how.

Why?

I set up bitcoincounsel.com and liked the idea of a central place to go to review the bitcoin ecosystem.  Obviously I got bored of keeping it up to date but thought it would be nice to cooperate with other directory sites to agree and build upon our combined directories.  This could easily be achieved with a simple RPC channel between a few cooperating directery sites but in the spririt of bitcoin I thought a P2P solution would decentralize the thing better and allow everyone to have a copy of the directory on their own hardware.

How?

I think of it as being very similar to GIT.  People make commits to their own repository (directory) which creates a unique hash, nodes can communicate with each other using hashes to determine the changed or not changed state of other nodes.

The repository would simply store textual information, for a directory in would focus on each entity (business, user, whatever) but I guess the system could be used for any simple textual information and not just business listings.

Obviously some nodes/maintainers are not going to agree on a particular change to a business listing (listing been deliberately destroyed or incorrect updates) so some sort of diff tool should be intergrated so maintainers when merging other changesets can include some bits and ignore others.  This will lead to multiple versions of the directory.  Each node should also include how many other nodes are using a particular branch.

As a node operator, I should choose which nodes I want to cooperate with, perhaps giving some readonly access and others confirm before merge and others auto-merge rights. That way if nodes start sending crappy commits I can block them, if they start sending fraudulent branch usage statistics then I can block them etc.

My goal is that hopefully one branch becomes the leading branch in terms of usage and commits etc.  There's not much point creating a competing branch of the directory that less people use, it encourages you to bring your changes inline with what the majority want.  New users coming into the system will straight away see the largest most popular branch and most likely go with that as the standard.

As an added bonus it would be nice if business owners could identify themselves with a signed message or something and inject their own additional information into the listing.  Other nodes would confirm that it was valid and commit it and include it in the chain.  That way businesses can use it to correct or pretty up their own listing.

Anyway, i'm not sure if this would even be doable, i'm sure there are some challenges that I have overlooked.

Thoughts? Would you participate in the network? Is it worth pursuing? Any major hurdles I have over simplified?