How to cancel Bitcoin transaction ? - Voskcoins

Beginner's Guide to Exchanges - Part 2

Beginner’s Guide to Exchanges – Part 2

A little late, but as promised here is Part 2 of the Beginner’s Guide to Exchanges. I would like to sincerely thank everyone for their support and feedback in making these.
Link to Part 1
This time I also made a Google Docs survey in the hopes of sharing the results with the community. I thought we could share what we use as a whole and why redditors choose the exchanges they do. For skeptics (as you all should be), I assure you that I am not collecting personal information. This is for recreation and if you are still wary, then by all means abstain!
Link to Survey
In Part 3 I will be wrapping up this series by covering decentralized, semi-decentralized, and derivative exchanges. Here it goes!

00 – Concepts and Definitions (Continued)

04 – Fiat Exchanges – Canada

QuadrigaCX

Country Linked Bank Transfer Wire Transfer Paypal Credit/Debit Crypto Transfer
CAD Deposit 1%/ Withdraw Free Free Free (Withdraw Only) 1% (Withdraw Only) Free
USD - Free Free (Withdraw Only) - Free
Exchange Type Maker Taker
Fiat .5% .5%
BTC/ETH .2% .2%
Feature Details
2FA Google Authenticator or Email 2FA Available
Wallet Security Undisclosed amount of funds in cold storage
Web Security 3rd Party Security provided by CloudFlare
Bug Bounty Expired $50 bounties
Tier Level Name Email DOB Phone Address Official ID Bank Info Credit Score Limits
Basic Account X X Digital only, Limits Vary
Verified Account X X X X X X Limits Vary

05 – Fiat Exchanges – Europe

CEX.IO

Country Credit/Debit Bank Transfer Crypto Transfer
Europe 3.5%+ €0.24 Deposit €0 / Withdraw €25 (SEPA €10) Free
Russia 5% + ₽ 15.57 - -
UK 3.5%+ £0.20 Deposit £0 / Withdraw £20 (SEPA Free
US 3.5%+ $0.25 Deposit $0 / Withdraw $50 Deposit $0 / Withdraw 1%
Exchange Type Maker Taker
All Currencies 0% .20%
Feature Details
2FA Google Authenticator Available
Wallet Security Undisclosed amount of funds in cold storage
Credit Card Data Overseen by 3rd Party Kyte Consultants
Web Security SSL Certificates and Encrypted Personal Data
Tier Level Name Email DOB Phone Address ID + Photo Bank Info KYC Limits
Basic Account X X X Digital only
Verified Account X X X X X X $10,000 Daily/$100,000 Monthly

BTC-E / XBTC-E

Country Credit/Debit Bank Transfer Paypal
Europe - SEPA - Deposit .5% / Withdraw 1% (€100 min) -
Russia 6% 6% -
US 7% Deposit .5% ($20 min) / Withdraw 1% ($100 min) 7%
Exchange Type Maker Taker
All Currencies .20% .20%
Feature Details
2FA Google Authenticator Available
Password Expiration Must be changed every 6 months
DDoS Protection 3rd Party Security Services provided by CloudFlare
Bug Bounty Yes at xBTCe
Tier Level Name Email DOB Phone Address Official ID Bank Info KYC Limits
Verified User X X X X X No Stated Limits

Liqui.io

Exchange Type Maker Taker
All Digital Currencies 0.1% .25%
Feature Details
2FA Google Authenticator Available
Bug Bounty Reported bounty posted on HackerOne (unconfirmed)

06 – Fiat Exchanges – South Korea

안녕하세요 여러분! 혹시 우리 한국인 친구 이 보고서를 한국어로 읽고 싶어한다면 알려주세요. 관심이 많이 있다면 간단한 한국어 보고서도 만들 수 있습니다. This year, ETH has taken off like a rocket in the Land of the Morning Calm. With a population of just 50 million, South Koreans account for almost 30% of daily ETH trade volume. Even more surprising is that currently the daily volume of ETH is about 5 times higher than that of Bitcoin on Korean exchanges. Since demand is high, ETH is trading at a premium on Korean exchanges. Some users have been talking about capitalizing off this imbalance by trading on arbitrage between exchanges. For those who have no connection to Korea and hope to do so, I have bad news – all Korean exchanges require a National ID number and access to a Korean bank account. This makes Korean exchanges virtually closed to Korean nationals and those with long-term visas. Sorry everyone.

Bithumb

Coinone

Korbit

07 – Fiat Exchanges – China

With a great deal of anticipation, major Chinese exchanges started trading ETH this summer. Since these exchanges deal huge volumes of Bitcoin already, naturally it was expected that they invest heavily into ETH as well. So far this hasn’t quite lived up to the hype with many exchanges still favoring Bitcoin, Litecoin, Altcoins, and even Ethereum Classic (Gulp). Three of these exchanges underwent inspections by the Peoples Bank of China earlier this year and will be working closely with the government to ease fears of money laundering and market manipulation. There are a lot of Chinese sites, and since my Chinese is non-existent this list is basically just for name recognition. In many ways these sites are very similar in regards to security, verification, and fees compared to their western counterparts; just marketed at a different audience and currency. If users are seriously interested in these exchanges and making reviews, please contribute or ask!

OK Coin

Huobi

CH-BTC

Yunbi

08 – Coinswaps & Cryto-converters

ShapeShift

Changelly

submitted by poop_dragon to ethtrader [link] [comments]

5 rules to protect your account

5 rules to protect your account

https://preview.redd.it/2a9ct7or4u021.png?width=1167&format=png&auto=webp&s=0cd523b70cd51439e86a2e5b223e76318039144d

Rule number 1. Personal responsibility Each user is personally responsible for the security of their account and the safety of personal savings.
Rule number 2. Official website address Recently, the creation of phishing domain names that are most similar to the domain names of popular cryptocurrency exchanges is popular among cybercriminals. Therefore, always check the domain of the site in the address bar.
Rule number 3. Two-factor profile authentication For the best possible account protection, use two-factor authentication, which is an access system based on two “keys” and is used to enhance the protection of user accounts. Benefits: * Work does not need additional devices, since authentication occurs through a mobile device, which, as a rule, is at hand; * There is a constant update of the verification code, which is more secure than a single password to the system. We also recommend using Google Authenticator: * While using Google Authenticator there is no risk of delays when entering the site; * The application generates a unique six-digit key every 30 seconds, thereby reducing the chance of information leakage to a minimum. Important! Do not give anyone a personal device with Google Authenticator installed.
Rule number 4. Security of your Email Breaking mail is common, followed by the theft of funds from a stock exchange account. Therefore, when you first suspect a hacking account, you should contact support with a request to block withdrawal of funds. It is also important to remember that: * Do not open emails from unverified email addresses; * Do not send your personal data to third parties; * It is necessary to pay attention to the sender's address: as a rule, distribution from large stock exchanges comes from the official domain.
Rule number 5. Only original desktop and mobile apps. Do not install untested desktop and mobile applications. Cryptocurrency exchanges post information about existing applications on their official sites.
Some more security tips for your account: * Each time you log in to your account, you must receive an email with the specified IP address from which you are logged in; * If you have noticed a suspicious activity, report it to the support service; * Create unique passwords for each account; * Do not log into your account with an unverified device; * Do not go to the site through an unconfirmed link; * Get information from the source. These precautions increase the chances of securing your account and protecting information from intruders.
Do you follow these rules?
#deposit #trade #bitcoin #криптовалюта #биржа #invest #btc #bitfex#exchange #eth #cryptoexchange #защита #аккаунт
submitted by BitFlipli to Bitfex [link] [comments]

Current state of affairs

IMPORTANTE NOTE: THIS THREAD IS NO LONGER BEING UPDATED, PLEASE FOLLOW THIS ONE INSTEAD: http://www.reddit.com/mtgoxinsolvency/comments/21hrv8/current_state_of_affairs/ I explain the reason for the change here. Thanks!

LAST UPDATE: March 27th 2014 09:47 GMT +1

NOTE: I'm trying my best but because of the sheer volume of tidbits popping up every day, this post might ocasionally miss some updates. Please feel free to point it out in the comments whenever you feel there is information missing in the post, thanks!
A note on recovering funds: We have no information on how to recover fiat/bitcoins/goxcoins yet and MtGox has only given very vague statements so far. It is speculated Mark Karpeles (CEO of MtGox) is currently figuring out what to do and not flying to the Bahamas with our money. It is advisable to have patience and wait for new developments on the subject for the time being.
March 26th, 2014
Match 25th, 2014
A new rumor has surfaced twitter, currently unsubstantiated, from @CanarslanEren who according to his previous tweets would have previously either guessed correctly or know in advance about the recovered 200K BTC (emphasis mine):
Within a few days(or hours) @MtGox will announce that "they found ~670.000 #bitcoin & may release some BTCs to the victims. @PatronaPartners
https://twitter.com/CanarslanEren/status/448418452701974528
The community consensus at the moment seems to be of skepticism, as it always goes with this kind of rumors. See also:
March 21th, 2014
  • There's a new update on mtgox.com confirming the previous story of having recovered 200K BTC that were thought lost. Key points:
    • On March 7, 2014, MtGox Co., Ltd. confirmed that an oldn format wallet which was used prior to June 2011 held a balance of approximately 200,000 BTC (199,999.99 BTC)
    • For security reasons, the 200,000 BTC which were at first on the 7th moved to online wallets were moved between the 14 th and the 15th to offline wallets.
    • The bitcoins held today by MtGox Co., Ltd. amount to a total of approximately 202,000 BTC, including the above 200,000 BTC and the approximately 2,000 BTC which existed prior to the application for commencement of a civil rehabilitation proceeding.
March 20th, 2014
  • Several users were reporting issues with the balance-checking tool online at mtgox.com, namely that bank transfers and transactions stuck in progress were not showing. This is now apparently fixed and balances seem to have been accordingly updated. Thread here.
  • In line with the blockchain movements we've seen for the past few weeks and the respective MtGox API activity, finally a japanese news article appeared where MtGox lawyers announce MtGox has found and owns 200K BTC, translation, courtesy of h1d:
    Bitcoin exchange Mt.Gox which collapsed in February announced on 20th that they have found they're still in possession of the 200,000 BTC out of the 850,000 BTC that was reported to be lost.
    According to the lawyer, they found them on the 7th of this month by searching through a storage on the internet called a "wallet" which was being used by MtGox up until June 2011.
    MtGox has reported that they have lost almost all of the 850,000 BTC owned while filing for bankruptcy protection on February 28th.
    /bitcoin thread here.
March 18th, 2014
  • A new update on mtgox.com is now online: account holders can now provide their login authentication data on the site to retrieve the last status of their wallets for convenience. It would appear that this update is legimitate, Redditcoin states:
    I just called the MtGox call centre in Japan - they confirmed that the login has been put there by "legal" and they have not been hacked. I called this number from the original banckrupty announcement (I called from Australia - we are only 2 hours ahead): +81 3-4588-3922. A nice man with an American accent said that the login has been put there by "legal" for users to check their balances and that the website has not been hacked.
    Redditcoin asked for transaction history data as well:
    I called the number again (about an hour later) - again, absolutely no waiting - I called again to ask about my transaction history. The same man answered, with the American accent (although sounded Japanese), who spoke impeccable English. He said that the transaction history is still unavailable because the courts still have to "polish" it (whatever that means). I said I needed it for taxation purposes. He replied by saying he will "check on this, and post an update on the website soon".
    As for the balance data that can now be retrieved on mtgox.com, the site notes (emphasis mine):
    This balance confirmation service is provided on this site only for the convenience of all users. Please be aware that confirming the balance on this site does not constitute a filing of rehabilitation claims under the civil rehabilitation procedure and note that the balance amounts shown on this site should also not be considered an acknowledgment by MtGox Co., Ltd. of the amount of any rehabilitation claims of users. Rehabilitation claims under a civil rehabilitation procedure become confirmed from a filing which is followed by an investigation procedure. The method for filing claims will be published on this site as soon as we will be in situation to announce it.
  • The MtGox API which used to list pending transactions has been removed today. In the past few weeks, this API had shown that the hundreds of thousands of BTC moving in the blockchain connected with MtGox wallets could still belong to Gox. Thread.
Match 17th, 2014
March 16, 2014
An new unconfirmed, unverified IRC quote appeared on /bitcoin:
we are working on resuming service, can't say how soon it'll be
While the authenticity is still in question, if true this would be in line with all the rumors and hints we've seen up until now.
March 15, 2014
  • The hundreds of thousands of coins moving in the blockchain that MtGox allegedly still own have been spotted doing something new: the outputs are now merging in new addresses of 2K BTC each. This was first spotted in this thread and later confirmed here. As usual, we have zero indications of what this means yet. -Mahn speculates:
    The only thing I can imagine myself is that whoever is doing the splitting decided 50 BTC was too little or would take too long and switched to bigger outputs per address.
  • New movement in the MtGox order book as reported by their still online API has been detected. Thread.
  • Further discussion on bitcointalk revealed that the alleged personal customer information for sale by the recent MtGox data leak hackers is most likely fake. See also this thread.
March 14th, 2014
There's a new update on mtgox.com concerning their Chapter 15 US filing. It contains no new information other than the confirmation of the news that appeared on March 11th.
March 12th, 2014
  • MtGox US subsidiary assets have been temporarily frozen by US Judge. Story here.
  • Mark Karpeles declaration to the US Bankruptcy Court has been published online:
    "On February 7, 2014, all bitcoin withdrawals were halted by MtGox due to the theft or disappearance of hundreds of thousands of bitcoins owned by MtGox customers as well as MtGox itself. The cause of the theft or disappearance is the subject of intensive investigation by me and others -- as of the present time I believe it was caused or related to a defect or "bug" in the bitcoin software algorithm, which was exploited by one or more persons who had "hacked" the bitcoin network. On February 24, 2014, MtGox suspended all trading after internal investigations discovered a loss of 744,408 bitcoins presumably from this method of theft. These events caused among others MtGox to become insolvent and to file the Japan Proceeding."
    Discussion thread.
March 1st-11th:
http://www.reddit.com/mtgoxinsolvency/comments/1yvvec/current_state_of_affairs/cg2di1f
February 2014:
http://www.reddit.com/mtgoxinsolvency/comments/1yvvec/current_state_of_affairs/cfywewf
submitted by -Mahn to mtgoxinsolvency [link] [comments]

Question: what is the minimum fee that motivates the miners to do their task?

Basic stuff
The miners as a whole have the mission of validating all transactions that users generate (with sufficient fees), as quickly as possible, and place them into a PoW-secured blockchain.
The users can ensure that the miners as a whole will accomplish this mission by offering them the right incentives. If the incentives are adequate, the miners as a whole will want to accomplish that task, and will eventually do so -- assuming the stupid 1 MB block size limit is removed, of course.
If that happens, it does not make much difference for the system how the miners go about that mission, and how the incentives get split among them. The miners as a whole can be considered a contractor of the bitcoin network, who receives a payment to perform a certain job. As long as the contractor delivers what was expected, the customer does not care how the contractor did it, how much each worker got paid, if any staff got fired, etc.
Reward motivates regular mining of blocks
The block reward has been, since 2012 or earlier, more than sufficient incentive to motivate the miners to append new valid blocks to the blockchain, at the mean rate of about 1 every 10 minutes. However, the block reward does not motivate the miners to include any transactions in the blocks. On the contrary, a longer block is more expensive for the miner who mines it, and has a reduced chance of winning the PoW race, because of propagation delays. So, without considering the transaction fees, there is a significant disincentive for miners to include transactions in their blocks.
Marginal cost of processing a transaction
To a first approximation, we can assume that adding to a block another transaction with size S (in kB) will entail an expected cost (or expected loss of revenue) to the miner of at most M x S, for some constant M -- the marginal transaction cost (in USD/kB). This parameter will of course vary from miner to miner.
The marginal cost M includes the cost of extra bandwidth to broadcast the node (if the miner wins the race), the extra cost of validating that transaction, and the extra expected loss of reward and fees that would result from the increased propagation delays because of those S extra kB.
Since we will want to encourage all miners to include all transactions that they can, we can make a reciprocity assumption: if a miner decides to include a transaction of size S in his block, but fails to win the PoW race, he will have to download some other miner's version of that block, which will probably include that transaction too. So the bandwidth component of M must be counted for any block, like the validation cost. (If he loses, he will not have to validate the signatures of that transaction again).
On the other hand, the marginal cost M does not include the cost of mining proper (solving the PoW puzzle), since this cost is independent of the block size. Its economics must be analyzed seprately from the incentives to include transactions.
Fees motivate the inclusion of transactions
The immediate incentive for miners to include transactions into blocks are the transaction fees. As soon as a miner knows the transactions that were confirmed in the previous blocks, he can start filling his candidate for the next block with still-unconfirmed transactions.
Suppose that block size is effectively unlimited. In order for a miner to be motivated to include an transaction in the candidate block, its fee rate F (in USD/kB) must be significantly larger than his marginal cost M. Conversely, if F is significantly less than M, the miner will rather leave it out.
Therefore, for a single block, the miner will maximize his revenue if he includes all transactions with a fee rate higher than his marginal cost M, and ignores all those that pay less than M.
Moreover, it is better for the miner (and for the network, of course) if the blocks are effectively unlimited. As that demand grows, he will want to expand his connectivity and validation CPU power to process all transactions that pay more than M, no matter how many there are: since the cost of that expansion is included in M, by definition, and therefore will be covered by the fees.
Miner profits
Besides covering his cost, each miner also needs to to make a reasonable profit in order to remain in the business. If there was no block reward, the transaction fees would have to pay that profit, as well as the cost of PoW. As long as the reward is sizable, we can assume that it pays the full cost of the PoW and also enough profit to remove most of the need for the fees to yield a profit.
Note however that, no matter how much profit the miner makes from the block reward, he will only want to include transactions whose fee rate F is greater than the marginal cost M. In fact, the higher the block reward, the higher the marginal cost M will be, and therefore higher fees will be required to motivate the miner to procees the transactions.
Empty blocks
Even when there are transactions paying more than the marginal cost M, a miner may still mine empty blocks, with unverified parents. That happens because the miner can start mining a candidate block B(N+1) as soon as it gets the hash of the parent B(N), but cannot include any transaction in it until it has received the content of all blocks up to B(N).
However, these empty blocks will be mostly harmless, even if it may not seem so at first. They will happen only if the miner gets lucky and solves B(N+1) in a short interval of time, after it got the hash of B(N) but before it has managed to download and validate its contents; and he is motivated by the fees to make that interval as small as he can.
More generally, a miner will not want to generate empty blocks, if he is able to fill them with transactions that pay more that his marginal cost M. Conversely, if all transactions pay less than M, the miner will want to process only empty blocks.
Once an empty block B(N+1) has been mined, all miners can start working on empty candidates for B(N+2). Since B(N+1) is empty, They can start filling their B(N+2) as soon as they finish downloading B(N). Eventually that download will finish, and then they will put into the non-empty B(N+K) all transactions that accumulated in the meantime.
As long as the time interval between an empty blocks and its parent is short compared to the average block interval T (600 sec), the impact of emty blocks on the expected confirmation delay T will be relatively small -- approximately 1/2 of the average block download time. For example, if the latter is 30 seconds, then T will be 615 seconds instead of 600 seconds.
The question
So, in numbers, what is the marginal cost M (in USD/kB) for a typical miner to add one more transaction to his candidate block -- assuming no block size limit taking into account all costs, including the expected loss that results from the reduced chances of getting that block accepted because of the size increase?
I expect the bandwidth component of the marginal cost M to be small (on the order of a penny or less per transaction). I guess that the cost of validation will be insignificant, since it can be trivailly parallelized and there will be constraints on the number of script ops. But I have no idea about the term due to expected reward loss. It is however proportional to the USD value of the current block reward, currently about 9000 USD/block (while the other two terms do not depend on it).
How is the situation now? The miners are still processing, more or less promptly, all transactions that pay more than the current minimum fee per byte. There are empty blocks, but they may be just the unavoidable ones, I don't know.
So, perhaps the current minimum fee rate is already above the marginal cost M of all miners, or at least of the largest ones. Or maybe they just haven't realized that the current minimum rate is too low, and they could earn more by mining only empty blocks.
Posting the miner fees
The minimum transaction fee rates should not be set by the developers. Since the fees are paid by users and earned by miners, developers have no "right" to influence them.
Instead, each miner X should estimate his marginal cost M and choose his minimum required fee rate Freq[X]. These fee rates then should be combined somehow into a global minimum fee rate Fmin, or in a fee x delay function T(F), for use by the clients. I have no especially bright ideas on how to do this.
Optimal fee rate
A miner X can try to increase his revenue by posting a required fee Freq[X] substantially higher than his marginal cost M. However, that may cause some drop in the overall demand, and the loss of the fee revenue from transactions that pay less than Freq[M] but moe than M.
The miner will want to set his posted fee rate Freq[X] t the value Fopt[X] that maximizes his net revenue. This will depend on the fee x demand curve of the user base, and on the fee rates Freq[Y] posted by his competitors. But this is the problem that every business owner has to solve.
Although the PoW race is not a proper free market, I would guess that (barring cartel formation, explicit or tacit) the fee Fopt[X] for every miner X will be only 10-20% above his marginal cost M. But this is just a wild guess.
submitted by jstolfi to bitcoin_unlimited [link] [comments]

[uncensored-r/Bitcoin] Surging mining fees last 7 hours - can someone explain this please?

The following post by Butt_coiner is being replicated because the post has been silently removed.
The original post can be found(in censored form) at this link:
np.reddit.com/ Bitcoin/comments/7l7ll2
The original post's content was as follows:
I stumbled upon this: https://blockchain.info/unconfirmed-transactions this afternoon at 3pm PST. At the time there was 250,000 unconfirmed transactions, and total pending mining fees around 40 BTC.
Now, 7 hours later, the pending transactions are still approx 250,000 but the mining fees are at 366 BTC.
I haven't paid attention to any of this until this afternoon.
A) Is it normal to have this many unverified transactions B) Is it normal for the pending mining fees to surge so high / be this high?
submitted by censorship_notifier to noncensored_bitcoin [link] [comments]

12-21 07:42 - 'Surging mining fees last 7 hours - can someone explain this please?' (self.Bitcoin) by /u/Butt_coiner removed from /r/Bitcoin within 80-90min

'''
I stumbled upon this: [link]1 this afternoon at 3pm PST. At the time there was 250,000 unconfirmed transactions, and total pending mining fees around 40 BTC.
Now, 7 hours later, the pending transactions are still approx 250,000 but the mining fees are at 366 BTC.
I haven't paid attention to any of this until this afternoon.
A) Is it normal to have this many unverified transactions B) Is it normal for the pending mining fees to surge so high / be this high?
edit I don't know if this chart on fees plays into this as well: [link]2 And what's with the giant spike in tx count (have to switch the chart from tx fee to tx count to see what I'm talking about)
'''
Surging mining fees last 7 hours - can someone explain this please?
Go1dfish undelete link
unreddit undelete link
Author: Butt_coiner
1: https://blockchain.info/unconfirmed-transactions 2: https://fork.lol/tx/fee
submitted by removalbot to removalbot [link] [comments]

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