Čvn 15

Major Bitcoin Exchanges Crippled by DDOS Attacks Amid Record Price Rally

· June 15, 2017 · 12:45 pm

Denial-of-service attacks brought several major Bitcoin exchanges to their knees this week, leaving traders locked out of the system, as hackers reap the market rewards.


Ongoing Cyber Attacks

DDoS attack

The DDoS attacks, timed to occur during intense periods of trading, gain the hackers a market advantage during price swings. Allowing them to game the price difference on compromised exchanges. Users are left locked out of the system during what could be crucial time periods of market activity.

Bitfinex, the largest U.S dollar-based bitcoin exchange has admitted that their platform was under DDoS attack. However, despite what they refer to as ongoing attacks, they do say that “Most users will be able to use the platform normally.” and released the following tweet;

BTC-e is also believed to have been affected, as their site went down temporarily. They also posted a tweet acknowledging the issue though it has since been deleted.

Market Fears and Due Caution

While no coins were directly stolen from users during the attacks, the ensuing instability caused significant chaos nonetheless. Those who remember, or were victims of, the disappearance of the Mt.Gox and Cryptsy exchanges, know that Bitcoins should not be left on these platforms in case of more catastrophic attacks.

Users engaged in Margin trading on these sites are particularly at risk as they are unable to close their positions and stand to lose a lot of money if no stop-loss measure has been put in place.

In an interview with CNBC, Benjamin Roberts, co-founder and CEO of digital currency trading start-up Citizen Hex offered this warning to cryptocurrency investors:

Investors with assets on centralized cryptocurrency exchanges should be careful. The track records of these organizations are not good, and as the assets on the exchanges grow, so does the bounty for attacking or hacking them.

Unprecedented New Interest In Bitcoin

Bitcoin exchanges are also under the pressure of a surge of new users who are noticing Bitcoins price gains.  The price of Bitcoin climbed to $3000 this week before plunging down to $2400, a move which does nothing to allay fears about the famously volatile coin.

Bitcoin exchange Coinbase has struggled to keep up with the massive influx of new customer registrations. CEO Brian Armstrong recently tweeted:

The CoinBase site has been down this week too, something they put down to the high traffic they were experiencing.

Should the exchanges be doing more to protect their users? Are they improving? Have you had an experience with the exchanges you’d you like to let Bitcoinist know about? Let us know in the comments below.


Images courtesy of Twitter, Shutterstock

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Bře 18

Could This Be The End For Bitcoin Unlimited?

· March 17, 2017 · 11:30 pm

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20 Bitcoin Exchanges have agreed to list Bitcoin Unlimited (BTU/XBU) as an altcoin, if a hard fork should occur.


BTC & BTU

In the midst of a heated discussion on the scalability and future of Bitcoin, a group of 20 Bitcoin exchanges, including major eastern and western ones, have announced that should a hard fork occur, they will list BTC (Bitcoin Core) and BTU (Bitcoin Unlimited) as two separate currencies.

This decision, backed by BitFinex, BitStamp, Kraken, BTCC, BTCChina, ShapeShift, BitSquare, QuadrigaCX, and other exchanges, was announced in a joint statement.

This announcement reads:

Since it appears likely we may see a hardfork initiated by the Bitcoin Unlimited project, we have decided to designate the Bitcoin Unlimited fork as BTU (or XBU). The Bitcoin Core implementation will continue to trade as BTC (or XBT) and all exchanges will process deposits and withdrawals in BTC even if the BTU chain has more hashing power.

These exchanges have pledged to only add Bitcoin Unlimited (BTU) as an altcoin only if both chains can be run without any conflicts, something that currently is a concern due to the risk of transaction replays.

bitcoin-unlimited

A few hours after this announcement, Poloniex and BitMEX joined in as well, both supporting the plan released by the other exchanges. BitMEX in particular stated:

BU will not be listed or used as a deposit/withdrawal currency until replay protection is implemented and BU is not at risk of a blockchain reorganization if the Core chain becomes longer.

Transaction Replays & Hard Forks

This isn’t the first time a major cryptocurrency has come under danger of hard forking; in fact, Ethereum experienced a similar situation last year. However, this wasn’t without mishaps; Ethereum experienced a number of replay attacks after the fork.

A replay attack is where a transaction carried out on one chain is broadcasted on the other chain. For example, Bob may want to send BTU to Alice. However, this transaction could be rebroadcast on the BTC chain, meaning that Bob would lose both his BTU and BTC.

The announcement states that the exchanges will only list Bitcoin Unlimited if the replay attack vector is eliminated, such as by changing address formats or moving coins to new addresses.

“[N]one of the undersigned can list BTU unless we can run both [blockchains] independently without incident. Consequently, we insist that the Bitcoin Unlimited community (or any other consensus breaking implementation) build in strong two-way replay protection,” the group said. “Failure to do so will impede our ability to preserve BTU for customers and will either delay or outright preclude the listing of BTU.”

The End of the Road for Bitcoin Unlimited?

This new decision could be a devastating blow to Bitcoin Unlimited’s (BU) approach in what has been a tough week for BU. Earlier this week, a critical bug was discovered and later patched, but not before taking half the network’s nodes offline and leading many in the community, including Andreas Antonopoulos, to question BU’s code QA (quality assurance) process.

Additionally, according to coin.dance, a large majority of the companies and services in the Bitcoin Space prefer SegWit over Bitcoin Unlimited by a wide margin.

SegWit Bitcoin Unlimited Support

Furthermore, a majority of miners also support Bitcoin Core. However, if Bitcoin were to fork off into Bitcoin and Bitcoin Unlimited, the loss of a large amount of hashpower could still be detrimental to Bitcoin.

Bitcoin Core Bitcoin Unlimited Pie Chart

Many users and prominent community members have also voiced out against Bitcoin Unlimited, believing that it is a rash and unprofessional attempt to scale bitcoin or even an “attempted robbery.” Some have even gone as far as to suggest a User Activated Soft Fork (UASF), a type of fork where nodes actively reject blocks that don’t signal for SegWit activation.

However, this might not even be necessary, seeing that many exchanges will now only see Bitcoin Unlimited’s approach as an attempt to create an altcoin.

Do you think that Bitcoin Unlimited will try to hard fork the network? If so, do you think that their chain will survive? Let us know your thoughts in the comments below!


Images courtesy of Coin Dance, AdobeStock, Shutterstock

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Led 19

Protect Yourself From These Shapeshift.io Based Scams

Source: bitcoin

Protect Yourself From These Shapeshift.io Based Scams

Recently in a post on their blog, Shapeshift.io has warned users of various scams that are taking place on social media and attempt to lure users into depositing cryptocurrency on impostor sites such as “shapeshit.io” Shapeshift has released a detailed report to help users protect their funds and avoid falling victim to these attacks.

Also read: Local Apple App Store Pricing Changes Show Why Bitcoin is The Only Global Currency

 

Potential Shapeshift-based scams

Shapeshift.io has identified the following as the most common scam attempts on social media:

  • Twitter accounts asking people to take surveys and then send a certain amount of bitcoin to be exchanged via twitter DMs
  • Twitter account asking people to send a certain amount of bitcoin to be exchanged via twitter DMs Copy cat website that looks like ShapeShift.io but is spelled “ShapeShit.io” that provides you with a deposit address but does not do the exchange.
  • Other copy cat websites that look different from the ShapeShift site but offer instant exchanges and provide you with a deposit address but does not do the exchange

Shapeshift further clarified that they would never ask users to send cryptocurrency to an address through social media and also identified all of their authentic social media channels so that users can watch out for fake accounts claiming to be the company. Because their platform is completely open source, people are able to create impostor websites using the same API which will allow for deposits but won’t complete the exchange, this results in a loss of user funds.

Shapeshift users are encouraged to always check the URL before depositing funds and always check that the HTPPS protocol is correct on the URL bar. Another telling sign of a fake site is an unusually high deposit limit. At this time, limits above 100 BTC do not currently exist on Shapeshift. Users can report impostor and scamming sites and Shapeshift will work to remove them.

In closing, be very careful as these scams are becoming more common. Take precautions to ensure that you are using the legitimate Shapeshift to avoid theft and falling victim to a scam. You can read Shapeshift’s blog post right here. 


Have you seen any potential Shapeshift-based scams? Let us know in the comments below! 

Images via Shapeshift and Pixabay.

 

The post Protect Yourself From These Shapeshift.io Based Scams appeared first on Bitcoinist.net.

Protect Yourself From These Shapeshift.io Based Scams

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