giszmo



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LegendaryActivity: 1722Merit: 1037WalletScrutiny.com Re: Announcing the Bitcoin Kiez rollout November 15, 2012, 06:46:52 PM #41 Quote from: Stephen Gornick on November 15, 2012, 08:00:10 AM Quote from: yossarian on November 14, 2012, 06:05:49 PM The new merchants all installed the Satoshi client on their laptops.

Make sure the clients are configured for outgoing communications only ( -nolisten ). This is because knowing the IP address of the node, it becomes not terribly hard to perform a race attack to double spend. And the way the Bitcioin.org client functions, the merchant might not even notice ... the transaction would just disappear as if it had never been made.



It might even be seen as a challenge by someone to be the first to pull off a race attack double spend against a bricks and mortar merchant. If configured with -nolisten (and optionally, an outgoing connection made explicitly to a well-connected node), then the chance of a race attack succeeding is much much lower, to where the profit on the sale is likely orders of magnitude greater than any losses due to a race attack double spend.

Make sure the clients are configured for outgoing communications only ( -nolisten ). This is because knowing the IP address of the node, it becomes not terribly hard to perform a race attack to double spend. And the way the Bitcioin.org client functions, the merchant might not even notice ... the transaction would just disappear as if it had never been made.It might even be seen as a challenge by someone to be the first to pull off a race attack double spend against a bricks and mortar merchant. If configured with -nolisten (and optionally, an outgoing connection made explicitly to a well-connected node), then the chance of a race attack succeeding is much much lower, to where the profit on the sale is likely orders of magnitude greater than any losses due to a race attack double spend.

Gnah, race attacks. I don't want to say they are not an issue at all but in this case I would say: "Please don't spread fud."



If people do this in a burgers place, they are known to the waiter and highly risk to get caught. If it actually happens in the wild, this will be good for the burger place, too as it's news and news is worth more than a burger's worth lost. Gnah, race attacks. I don't want to say they are not an issue at all but in this case I would say: "Please don't spread fud."If people do this in a burgers place, they are known to the waiter and highly risk to get caught. If it actually happens in the wild, this will be good for the burger place, too as it's news and news is worth more than a burger's worth lost. ɃɃ WalletScrutiny.com Is your wallet secure? (Methodology)

WalletScrutiny checks if wallet builds are reproducible, a precondition for code audits to be of value. ɃɃ

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sethsethseth



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Not trusting third parties with my private keys







Sr. MemberActivity: 257Merit: 250Not trusting third parties with my private keys Re: Announcing the Bitcoin Kiez rollout November 16, 2012, 04:06:48 PM #42



https://en.bitcoin.it/wiki/Real_world_shops The map of Real World Shops is filling in nicely in America and Europe. Great job guys.

Electrum client is awesome. Try it. And please stop sending bitcoins to sites run by security newbies, or don't complain when you lose everything. SealsWithClubs poker room has over 400 players online. Buy in from .01 to 60btc. BTCSportsMatch lets you bet sports with vig free lines! Best kept secret in bitcoin.... LocalBitcoins.com is very user-friendly now for bank transfers. You don't have to live close to trade when in the same currency area.Electrum client is awesome. Try it. And please stop sending bitcoins to sites run by security newbies, or don't complain when you lose everything.

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Hero MemberActivity: 492Merit: 500 Re: Announcing the Bitcoin Kiez rollout November 17, 2012, 02:55:46 PM #45



Heidi offers a wide variety of ways to explore Berlin. Whether it's a tour to the remains of the wall, an insight to the Jewish Berlin or a walk through Kreuzberg, where the Bitcoin Kiez is located: Heidi will make it interesting and worthwile.



More info on her website,



If you want to make arrangements for YOUR tour, you can contact Heidi through her website,



This week, tour guide Heidi Leyton started to accept Bitcoin.Heidi offers a wide variety of ways to explore Berlin. Whether it's a tour to the remains of the wall, an insight to the Jewish Berlin or a walk through Kreuzberg, where the Bitcoin Kiez is located: Heidi will make it interesting and worthwile.More info on her website, http://heidileyton.com If you want to make arrangements for YOUR tour, you can contact Heidi through her website, http://heidileyton.com/?page_id=21 or reach her via info@HeidiLeyton.com



Buy and sell BTC via SEPA:



Bitmessage: BM-2DAoXPtLdQEnR2iSneCTjpgRPtzXsSAi1m I'm always buying and selling BTC, PM me for details. Rating and GPG-key: http://is.gd/yossarian Buy and sell BTC via SEPA: https://www.bitcoin.de/r/nrnxg6 Bitmessage: BM-2DAoXPtLdQEnR2iSneCTjpgRPtzXsSAi1m

phelix



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LegendaryActivity: 1708Merit: 1005nmc:id/phelix Re: Announcing the Bitcoin Kiez rollout November 17, 2012, 03:25:30 PM #46 Quote from: Ente on November 15, 2012, 09:04:42 AM Quote from: joecooin on November 15, 2012, 04:13:09 AM Quote from: fornit on November 15, 2012, 02:48:42 AM so you can only link a customer to a payment via the paid amount?



Yes.



Only the EUR value of the purchase goes into the books.



Alternatively one can book the BTC onto one account and declare the value of that ballance according to the exchange rate at the time of the tax declaration. This makes more sense when one starts to also pay for business expenses in BTC.



We will upgrade the wallets of the bars / restaurants with nfc chips so the waiters can just walk up to a table, tell the amount to be paid, transmit the address and once they walked back behind the bar they can already check if the payment is on the way. Unconfirmed transaction on the blockchain is enough.



Works fine.



Joe





Yes.Only the EUR value of the purchase goes into the books.Alternatively one can book the BTC onto one account and declare the value of that ballance according to the exchange rate at the time of the tax declaration. This makes more sense when one starts to also pay for business expenses in BTC.We will upgrade the wallets of the bars / restaurants with nfc chips so the waiters can just walk up to a table, tell the amount to be paid, transmit the address and once they walked back behind the bar they can already check if the payment is on the way. Unconfirmed transaction on the blockchain is enough.Works fine.Joe

Maybe it would make sense to automatically save the used conversion rate when receiving a Bitcoin payment? The schildbach client obviously knows the rate, so it could write it into a simple text file too.

I just imagined the horror when a tax guy sees your bitcoins in your tax declaration, and wants to know every single conversion rate for every of those 749 Bitcoin payments.. It probably wouldn't even be possible to find out the "24h mean exchange rate" from a month ago?



Ente

Maybe it would make sense to automatically save the used conversion rate when receiving a Bitcoin payment? The schildbach client obviously knows the rate, so it could write it into a simple text file too.I just imagined the horror when a tax guy sees your bitcoins in your tax declaration, and wants to know every single conversion rate for every of those 749 Bitcoin payments.. It probably wouldn't even be possible to find out the "24h mean exchange rate" from a month ago?Ente

from how I understood they are booking via their normal system anyway and will handle all taxes there (receive bitcoin is like receive fiat cash).



Though I am sure this system works just fine and makes paying with bitcoin possible at almost no cost and effort:



What would be even nicer was to be able to do an integrated bitcoin order/buy. Maybe for the most often ordered items like beer, water, coke you could just put a print with a couple of (design) qr codes on each table such that the system knows what to bring to what table right after ordering/paying via the blockchain.



The question is how to smoothly insert this knowledge into the regular workflow? A little printer?



You could also put a qr code for tips and one to broadcast that the current order for the table is finished by sending a satoshi.







from how I understood they are booking via their normal system anyway and will handle all taxes there (receive bitcoin is like receive fiat cash).Though I am sure this system works just fine and makes paying with bitcoin possible at almost no cost and effort:What would be even nicer was to be able to do an. Maybe for the most often ordered items like beer, water, coke you could just put a print with a couple of (design) qr codes on each table such that the system knows what to bring to what table right after ordering/paying via the blockchain.The question is how to smoothly insert this knowledge into the regular workflow? A little printer?You could also put a qr code for tips and one to broadcast that the current order for the table is finished by sending a satoshi. blockchained.com ■ bitcointalk top posts ■ bitcointalk top posts

wumpus



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No Maps for These Territories







Hero MemberActivity: 812Merit: 1000No Maps for These Territories Re: Announcing the Bitcoin Kiez rollout April 28, 2013, 10:37:37 AM #51

Love to see this. Very cool Warning: For most, coin loss is a larger risk than coin theft. A disk can die any time. Regularly back up your wallet through File → Backup Wallet to an external storage or the (encrypted!) cloud. Use a separate offline wallet for storing larger amounts. Bitcoin Core developer [PGP] For most, coin loss is a larger risk than coin theft. A disk can die any time. Regularly back up your wallet throughto an external storage or the (encrypted!) cloud. Use a separate offline wallet for storing larger amounts.

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LegendaryActivity: 1204Merit: 1001 Re: Announcing the Bitcoin Kiez rollout April 28, 2013, 03:51:20 PM

Last edit: April 28, 2013, 09:40:05 PM by Akka #55 Quote from: Mike Hearn on April 28, 2013, 03:37:53 PM Despite what you may read about the forum, unconfirmed transactions work plenty well enough for this sort of thing.



Exactly. Trying to make a double spend in bar or a brick and mortar Shop is by far riskier than to just grab you item and make a run for it. Exactly. Trying to make a double spend in bar or a brick and mortar Shop is by far riskier than to just grab you item and make a run for it. All previous versions of currency will no longer be supported as of this update