Business 14 March 2019

Ed Drake

Police in Canada hunt BTC ATM double-spend scammers

Police in Canada are pursuing four men in connection with so-called ‘double-spend’ attacks, a type of cryptocurrency scam that has been plaguing Bitcoin Core (BTC) across the country, CBC reported.

Some 112 transactions dating back to September 2018 have been flagged by authorities as double-spend transactions, allowing scammers to steal money by effectively spending the same BTC twice. The scam is thought to have involved an average transaction value of $1,800, with a total of $200,000 scammed by the group over a period of 10 days.

Over half the identified transactions have been attributed to ATMs in Calgary, with the remainder spread between Winnipeg, Toronto, Montreal, Sherwood Park, Ottawa and Hamilton.

The scam has been made possible through 0-confirmation transactions at the ATMs, enabling double spending while forcing merchants to wait for confirmation.

Much of the blame has been laid at tools like replace-by-fee from Bitcoin Core developer Peter Todd, which could have enabled these zero-confirmation transactions. While not designed for criminal applications, the tool is described by Todd as a means of creating successive transactions to smooth ‘stuck’ transactions.

On GitHub, Todd explained, “[Replace by fee] Creates two transactions in succession. The first pays the specified amount to the specified address. The second double-spends that transaction with a transaction with higher fees, paying only the change address. In addition you can optionally specify that the first transaction additional OP-RETURN, multisig, and ‘blacklisted’ address outputs. Some miners won’t accept transactions with these output types; those miners will accept the second double-spend transaction, helping you achieve a successful double-spend.”

While tools like replace by fee are controversial, their use is practical necessity, ensuring users can transact quickly without waiting for confirmations. But with the extent of this latest theft, which has seen scammers walk with as much as $20,000 a day in ill-gotten gains, serious questions must now be asked about BTC as a payments system.

The truth is BTC is no longer up to the job, and is riddled with technical problems which undermine trust and usability.

For the time being at least, those alleged to have been involved in the thefts remain at large.

Note: Tokens on the Bitcoin Core (SegWit) chain are referenced as BTC coins; tokens on the Bitcoin Cash ABC chain are referenced as BCH, BCH-ABC or BAB coins.

Bitcoin Satoshi Vision (BSV) is today the only Bitcoin project that follows the original Satoshi Nakamoto whitepaper, and that follows the original Satoshi protocol and design. BSV is the only public blockchain that maintains the original vision for Bitcoin and will massively scale to become the world’s new money and enterprise blockchain.

COMMENT

latest news

‘Irresponsible tweets’ land John McAfee in hot water with Skycoin

Business 22 March 2019

‘Irresponsible tweets’ land John McAfee in hot water with Skycoin

Skycoin has responded on Twitter that it John McAfee’s comments about “whale f--king” that actually led to the project being forced to sever ties with the cryptocurrency influencer.

Read More
Watch out: Fake Wasabi crypto wallet out to steal your crypto

Business 22 March 2019

Watch out: Fake Wasabi crypto wallet out to steal your crypto

The scam wallet is an uncanny clone of the real Wasabi wallet. It comes with a fake website and for those who are not keen, it's almost impossible to distinguish between it and the real one.

Read More
UPS partners with blockchain startup for B2B platform

Business 22 March 2019

UPS partners with blockchain startup for B2B platform

UPS, a global leader in logistics, announced a partnership with Inxeption that targets B2B merchants.

Read More