GreenAddress Bitcoin Wallet

AMA: I'm the guy trying to crowdfund an open source Raspberry Pi-based Bitcoin payment terminal - ask me anything! And if I may, a question to you: If you are not pledging, what is your main reason not to?

Website with more details: https://www.thebitcoinbox.com
Executive summary: Based on a Raspberry Pi, I would like to develop an open source Bitcoin point of sale solution, which is focused on tap-to-pay via NFC and also has a display module for QR codes. The plan is to make integration with existing cash registers possible down the line (connected via Ethernet), although in this first step it will be a standalone device.
My background: I have been tinkering with Bitcoin POS solutions since 2011, when I released one of the first prototypes in that area as open source ( https://github.com/javgh/greenaddress-pos-tools ), I was the founder of Instawallet and Bridgewalker (precursor to Bitreserve/Coinlock), coined the term 'green address' and do Android development for Hive.
I feel that having such a low-cost, yet tailored solution would be a great tool for the community. It could also be a great building block to be integrated into other solutions, be it existing POS systems or new developments. That's why I spend some time on a prototype. But as a freelancer, there is a limit as to how many unpaid hours I can justify, so that's why I'm turning to the community and hope you will help me out a bit!
On the other hand, if the overall opinion is: Not this, not like this or not this guy - then it would also be great to know why, so I can focus my energy in a different way.
Thanks for taking a look - happy to answer questions!
submitted by jav_rddt to Bitcoin [link] [comments]

Hi r/bitcoin, I'm working on a point of sale terminal combining NFC and (optional) offline payments based on a Raspberry Pi and am thinking of doing crowdfunding to finish the project and release the 'Bitcoin Box' as open source and open hardware. What are your thoughts - would you pledge?

Video of the protoype: https://www.youtube.com/watch?v=P7vKHMoapr8
More background info in this Coindesk article: http://www.coindesk.com/bitcoin-box-can-process-payments-web-connection/ .
My background: I have been tinkering with Bitcoin POS solutions since 2011, when I released one of the first prototypes in that area as open source ( https://github.com/javgh/greenaddress-pos-tools ), I was the founder of Instawallet and Bridgewalker (precursor to Bitreserve/Coinlock), coined the term 'green address' and do Android development for Hive.
I would ask for 9000 USD which would get you:
What are your thoughts? Would you fund a project like this? I appreciate your input!
To address one question right away: "Why is this even needed? Just use a cheap Android phone and slap an app on it, done!". Cheap Android phones often do not have NFC or have the antenna in some inconvenient place for a checkout situation. The more important advantage of the Pi is though, that it has an Ethernet port, which will make it possible to connect it to cash registers. This kind of integration would not be part of this crowdfunding round, but it would be the next logical step.
submitted by jav_rddt to Bitcoin [link] [comments]

Green addresses: An accidentally dodged bullet?

Summoning an old posts from the archives of Bitcoin-development:
On Sun, Dec 18, 2011 at 6:03 AM, Luke-Jr [email protected] wrote:
On Sunday, December 18, 2011 7:15:26 AM Jorge Timón wrote:
I'm just saying is useful for the "green address" particular case.
"Green addresses" are also a broken-by-design feature and should be discouraged.
I've found myself wondering if the tech communities general resistance to "green addresses" didn't prevent this MTGox incident from being a systemic failure with far broader consequences.
For those who weren't around for this: Back in 2011 a system for instant payments in Bitcoin was proposed by instawallet and mtgox which basically forced all their transactions to be signed by a particular key (usually inefficiently bouncing through two hops like coinbase does today) and then recipients of these coins could analyze the blockchain... decide that the transaction was actually initiated by a reputable party and instantly credit the user.
There were many complaints about the systems— including severe concerns around privacy, scalability, equality of access, layering violations in the protocol, etc... though systemic risk didn't really come up much as far as I know— though I believe some pointed out that a better security model could improve equality of access. Refusal to accommodate this usage in client software appears to have largely prevented wide spread deployment.
Maybe in hindsight someone will claim they didn't deploy because they weren't willing to trust MTGox, but at the time no one publicly or privately said that to me.
When MTGox froze deposits they had over 30k BTC in stuck transactions pending which will now almost certainly never be paid even if there is some level of MTGox recovery.
With widespread green address use those obligations would have been dumped onto other Bitcoin businesses all over the ecosystem.
It's hard to speculate on what an alternative history would have been— but considering that I can find few/no opposition to green addresses on the grounds of systemic risk, I do wonder how much bigger the failure would have been if green addresses hadn't had so many other problems.. and if, perhaps, we dodged a rather large bullet here, and perhaps ought to worry about "interlocking common failure encouraged by technology" a bit more equally to other technological considerations.
submitted by nullc to Bitcoin [link] [comments]

Tutorial Green Wallet: gestiona bitcoins y L-BTC en una sola cartera First way to setup HW1 hardware wallet with Green Address (www.HardwareWallet.com / bitcoin) GreenAddress.it Bitcoin Wallet - YouTube Tutorial da carteira Green Bitcoin Wallet Green Address Bitcoin Wallet - Segwit, RBF, 2FA, Multisig and More

It was mainly written to demonstrate the use of the green address feature, but can also be used independently of that. It is written in Python and works in combination with the standard Bitcoin-Qt client. It is targeted at standard PC hardware, e.g. laptop (used by merchant) + external monitor (facing the customer). The main mode of operation is displaying a QR code with a Bitcoin URI to the ... Zahlungen müssen von Green Address selbst genehmigt werden. In gewisser Weise positiv, da bei großen Überweisungen dieselben Beschränkungen wie bei herkömmlichen Banken bestehen. GreenAddress waren die Verwendung spezieller vertrauenswürdiger ECDSA-Schlüsselpaare, um dem Empfänger die Herkunft von Geldern anzuzeigen. Unter der Annahme, dass der Empfänger dem Betreiber des ... Let’s start with what problem the green address is trying to solve. The goal was to try to do fast transactions for time-critical applications. Generally, bitcoin requires you to wait about 6 confirmations before knowing that your transaction has been incorporated into the blockchain. Thus, using green addresses is supposed to solve this as well as make sure that there are no double spending ... Bitcoin is the currency of the future. We don't make you choose between security and convenience. And we don't compromise your privacy.. Our per-transaction two factor authentication, multi-signature and deterministic wallet allow you unprecedented control over your transactions.. And, we never store your private keys, not even encrypted. At the same time we make it trivial to view and ... Not even Bitcoin Cash is offered on the platform at this stage. Interface and Tools. This is where GreenAddress actually excels, as it employs simple yet sophisticated design for its platform. The wallet has a premium-feel, with the green color being dominant for the entire platform. The tools are organized neatly, all buttons visible, meaning ...

[index] [33978] [36041] [5582] [798] [43109] [14980] [9209] [9120] [14123] [18556]

Tutorial Green Wallet: gestiona bitcoins y L-BTC en una sola cartera

Today I take a look at a more advanced option for mobile wallets: Green Address. In includes things like Segwit addresses, RBF (replace by fee), 2FA (2 factor authentication) and multi-signature ... Green Address Bitcoin Wallet - Segwit, RBF, 2FA, Multisig and More - Duration: 23:20. BTC Sessions 13,759 views. 23:20. José Antonio Bravo: Bitcoin es la pérdida de soberanía de los Estados ... Bitcoin is the currency of the future! And to secure your Wallet we use innovative an innovative multisignature and presigned transaction to offer a true ope... Green Address Cryptocurrency Digital Wallet Sign Up and Getting Started Tutorial For Beginners 2018 Green Address is a user-friendly Bitcoin wallet thats an excellent choice for beginners. Veja como usar a carteira Green: Bitcoin Wallet, também conhecida como Blockstream Green. Um tutorial para iniciantes que estão buscando uma carteira simples...

#