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Thanks to Bit-X!
I use theirs debit card already 3-4 months, everything fine! All transactions were done.
My wife has a debit named card too.
I recommend theirs! :-)
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I have read more times site of Plutus.it But i have many questions. Merchants get fiat money from who? From legal entity? From person? As i understand your presentation at plutus.it - you use the escrow. The escrow has a bank account. As i understand it's one organisation. If yes, why do you Etherium or decentralized network if it's centralized solution? It's very strange to use Etherium where it's not needed. You can use MySQL database  What happens if the escrow bank account will be frozen by bank? Or money will be stolen (by escrow for example)? I will lose bitcoins & money - bitcoins will be gotten by persons who bought their, money will be frozen. I use now the Bit-X.Com debit card. I do not see the benefits of your system. I have bitcoin address of card in Bit-X . I put there money, they make deposit through 1/2-1 hour and i pay by debit card. Yes, it's own company and i risk there. But you use "decentralized" word. But you have centralization - the escrow with bank account which have debit card feature... P.S. Personally, my opinion - you are trying to make out of nothing "revolutionary decision" under the guise of decentralization terms. The many bitcoin news write about you but you don't have any ready applications and etc. Only strange video from "Mark & Spencer" (fake video?). |
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Destinia.com - i use already it one year for many air tickets - all fine!
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Just checked the link and it worked fine for me. The myTrezor Lite app is still there. Yes, it works now but after i logged in Google Play. If i am not logged - i see error from Google But if i run Play Market under Android (where i logged) and i try to search "Mytrezor" - i don't see results. |
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It could work.
I think it could be added to the existing 'exchange rates' plugin
Is it added? Now i have v2.5.4 of Electrum and i see that my Total Balance (bottom line in Electrum) is X and incremental balance (Y) from exchange rate plugin (right column) has a same sum as Total X (X==Y). But previous column is "USD Amount" has a history binded price. And i see that incremental balance to be changed differently - for outgoing transactions incremental balance to be incr/decr for hostory's rate but incoming balance to be changed to other rate (is not history rate - may be full sum corrected value). Sorry for my English. But i think there some code changes which are related with same algorithm. RustyNomad, and your suggestion is same as my suggestion by other words as i think https://bitcointalk.org/index.php?topic=747342.msg8503970 |
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I live in CZ.
I buy regularly for bitcoin: flight tickets - destinia.com
Hotels - there too
Vinorum.cz -vine for me
DameJidlo.cz - meals from restaurants in Prague
Bit-x.com - goods in shop for debit card funded by Bitcoin (I understand that it's not answer to your question)
Coffeine cafe in Prague - coffee and cakes for Bitcoin.
Some restaurants in Prague where I can pay by bitcoin...
Some shops in internet.
Adafruit.com - some electronics
ViaBox.com - service of forwarding of post and buying for you in US shops (they use their debit cards)
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Can a bitcoin address can be recovered from public key... If not so how is it related to bitcoin address???
Bitcoin address is Base58 encoded a hash of public key. So if you have a public key you can calculate bitcoin address ;-) But you will not be able spend bitcoins - you will need a private key  |
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Other same trademark: Word Mark FREE BITCOINS
Goods and Services IC 036. US 100 101 102. G & S: Financial services, namely, providing a virtual currency for use by members of an on-line community via a global computer network. FIRST USE: 20150206. FIRST USE IN COMMERCE: 20150206
Standard Characters Claimed
Mark Drawing Code (4) STANDARD CHARACTER MARK
Serial Number 86535683
Filing Date February 16, 2015
Current Basis 1A
Original Filing Basis 1A
Owner (APPLICANT) Bitrush LLC LIMITED LIABILITY COMPANY DELAWARE Suite 375 5806 Mesa Drive Austin TEXAS 78731
Attorney of Record John Salcido
Type of Mark SERVICE MARK
Register PRINCIPAL
Live/Dead Indicator LIVE |
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Other same trademark: Word Mark THE BITCOIN STORE
Goods and Services IC 035. US 100 101 102. G & S: On-line retail store services featuring a wide variety of consumer goods of others; Retail store services featuring a wide variety of consumer goods of others
Standard Characters Claimed
Mark Drawing Code (4) STANDARD CHARACTER MARK
Serial Number 86590573
Filing Date April 8, 2015
Current Basis 1B
Original Filing Basis 1B
Owner (APPLICANT) Perrone, John INDIVIDUAL UNITED STATES 6353 Richmond Avenue #111 Houston TEXAS 77057
Attorney of Record Udeme Uwan
Type of Mark SERVICE MARK
Register PRINCIPAL
Live/Dead Indicator LIVE |
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I found this trademark I think it's not-legal trademark because there common words for Bitcoin world - bitcoin & solutions Other Bitcoin LIVE trademarks has a like this notice: "Disclaimer NO CLAIM IS MADE TO THE EXCLUSIVE RIGHT TO USE "BITCOIN EXCHANGE" APART FROM THE MARK AS SHOWN" "Disclaimer NO CLAIM IS MADE TO THE EXCLUSIVE RIGHT TO USE "BITCOIN" APART FROM THE MARK AS SHOWN" But this doesn't have. I think the Bitcoin Foundation should do something against this. What do you think? Word Mark BITCOIN SOLUTIONS
Goods and Services IC 036. US 100 101 102. G & S: Cryptocurrency payment processing
Standard Characters Claimed
Mark Drawing Code (4) STANDARD CHARACTER MARK
Serial Number 86604673
Filing Date April 21, 2015
Current Basis 1B
Original Filing Basis 1B
Owner (APPLICANT) Bitcoin Solutions LIMITED LIABILITY COMPANY TEXAS #111 6353 Richmond Avenue Houston TEXAS 77057
Type of Mark SERVICE MARK
Register PRINCIPAL
Live/Dead Indicator LIVE P.S. I think - these trademarks are created with the expectation to litigate later. They are like time bombs. |
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It makes it much easier. More nodes will accept the mutated transaction then would accept a transaction that outright conflicts with an existing transaction in it's mempool so the chances of getting the mutated transaction confirmed are greater.
If you make a first transaction will be first to yourself and after immadiatly you will pay to other who accept 0-confirmed tx - yes, this can help to you if your first tx will be duplicated by attacker firstly and be accepted by miners. Ok. But it's difficult way. Ok, you are right, may be it will help. |
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Besides BIP 62, which will take time to finalize, what can be done to prevent this attack? What steps can wallets and payment processors take? Thanks for being a good sport.
Stop relying on others to validate your transactions and watch the blockchain for you. Also, (this is the biggest one) don't categorize transactions based on transaction ID, then store them away and never check them again. It's not that hard. But it's hard when the wallet is already built from the ground up under the assumption that "Once we see a transaction, even with 0 confirmations, it's as good as done." Stop making that assumption, and code your wallets accordingly. Also, there needs to be vigilance on the user side as well. If you spend unconfirmed change, you are risking the chain being broken. If you accept unconfirmed transactions with unconfirmed inputs, you are at a large risk of being double spent if you don't wait for at least one confirmation. The only sure-fire way to prevent becoming a victim is to wait for confirmations. Yes, these are gold rules... But many companies don't follow these rules. The gold rule for bitcoin receivers to wait at least 1 confirmation. But many companies who paid to me don't follow these rules and after this attack i should resolve some unpaid trasnactions from them... They think that paid to me (they pay to me through some gateways) but i don't have bitcoins. This attack has benefited. But for many it is better understood, it is necessary to continue the attack for a long time. During time of this attack i thought that a bitcoin price will be dropped but one only grown  |
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I made some money on this attack, im happy
How would you have made money due to the attack? Easy. Send a tx to yourself, use those inputs for a second transaction to someone else who accepts 0/unconfirmed transactions, then mutate the txid of the first transaction, making the 2nd transaction invalid, allowing you to double spend the 2nd transaction. You could do a double-spending without this attack This attack doesn't help in this... |
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What problem? Malleability? THIS IS NOT A PROBLEM.
It's problem for wallet software. Read above. |
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I think that you are not advanced bitcoin user.
I think about you same too. P.S. Do you have anything to talk about this problem not about me? P.P.S. Есть что по делу сказать, или на личности будем переходить? |
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Can somebody explains in a simple sentence (subject + verb + object) what's the problem with this attack, besides that can be a possible duplicate for your transaction that never gets accepted by the Blockchain and gets deleted by the Blockchain after 1 week (estimated time)?
There are two problems: 1. Some wallets get confused should they send a transaction that gets changed by the attack, giving wrong status information to the user. 2. The attacker can increase the size of the memory pool of unconfirmed transactions, which uses extra processing resources, memory resources and network bandwidth, potentially causing sluggish performance of the network and crashing weak nodes. I will tell more I have Mycelium 2.5.2. It allows to spend from unconfirmed transactions (without this feature a user could not make a next transaction until a next block in blockchechain will be generated but user should have a right to spend a change al least for example from a previous payment without waiting) But this attack has a biggest problem as you could think - now i cannot spend my money from HD account already 3 days because this attack affected my Mycelium wallet. How it happens: I did Tx - A. After soon i did other Tx - B. The B uses inputs from Tx A. Both transactions were unconfirmed. But attacker rebroadcasted a changed new transaction - A'. And this transaction was confirmed! After refreshing in the Mycelium wallet the last one forgot about A and replaced it by A' Tx. But after i had the A', the B transaction which used inputs from my other Txs and from the A! But the A already doesn't exist because it was double-spended for blockchain! And the Tx B looks like normal transaction (not double-spend!) because it has input from A transaction (other hash) - there is original TxID and its Tx was forgotten. Miners and full nodes think that they have the B transaction but didn't get a the A yet (other inputs refere to valid Txs of course). And this transaction hangs in mempool already three days and i cannot use other inputs! As a result of this - i as user cannot use other bitcoins already some days. I tried to archive account in Mycelium, wait 1-2 days and activate account again - and this "zombie" B Tx restored again and holds other outputs of other Tx from spending because the B has them (i see it happens because the Mycelium company has own bitcoin blockchain explorer which remembers this B Tx long time). I think it problem is not only of the Mycelium wallet software. While malleability will be in current protocol and the BIP62 doesn't work yet - any atacker will be able to make many shit to other users with wallet software - in this case there will be only one way to use bitcoin: to make one transaction in wallet -> wait until confirmation -> doing next transaction... It is stupid and very not comfortable way of bitcoin using. What do you think about this? P.S. I am as an advanced user exported xpriv key in Electrum and after this made new transaction and did double-spend of other inputs which were blocked by B Tx... But should what do not-advanced user? He will think that bitcoin sucks and he lost a money... |
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And by this attack affected mining pools - some pools got transactions outputs of which valid but other ones. So after this attack all chains of 0-confirmed transaction very very slowly propogated through bitcoin network I send valid fine fee transactions but they are not confirmed a long time - somebody changed iut and rebroadcasted with other TxID As i understand should BIP62 help? |
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