#double spend

Bitcoin double-spend spotted in the wild

BitMEX Research has identified a suspected double-spend transaction valued at 0.00062063 BTC or roughly $21 — and it doesn’t appear to be an instance of that popular replace-by-fee wallet hack. On Jan. 20, BitMEX’s ForkMonitor noted that “multiple blocks were produced at height 666833.” BitMEX Research tweeted: [1/2] There was a stale Bitcoin block today, at height 666,833. SlushPool has beaten…

Bitcoin double-spend spotted in the wild

BitMEX Research has identified what it believes to be a double-spent Bitcoin transaction… worth $21.

Ethereum Classic Labs to Put Measures in Place to Safeguard Against Future 51% Attacks

After suffering a couple of 51% attacks, Ethereum Classic (ETC) Labs is planning to adopt measures that would protect its network from similar attacks in the future.  ETC Goes After NiceHash Amid Multiple 51% Attacks In a Medium blog post on Monday, ETC Labs announced that it would involve regulators globally and law enforcement agenciesRead More

Researchers Expose Flaw in Bitcoin Wallets That Could Be Exploited for Double-Spending

A standard way to transact Bitcoin could be vulnerable to double-spending, new research has found. Blockchain sleuths at ZenGo, a wallet startup, have found a vulnerability that affected at least three major crypto wallets – Ledger Live, Edge and Breadwallet (BRD) – and potentially more. 

The bug, which the Tel Aviv-based firm calls BigSpender, allows a hacker to double spend a user’s funds and…

Math Research Suggests Six Confirmations Aren’t Really Needed for Bitcoin Transactions

In a recent research paper, European mathematicians Cyril Grunspan and Ricardo Pérez-Marco demonstrated through calculus and game theory that, thanks to the robust network security and relatively high BTC price, small bitcoin transactions may not need the six confirmations typically required by merchants and exchanges.

Publishedon the computer science and cryptography section of Cornell…

$200k Bitcoin Fraud: Four Suspects Sought by Calgary Police

Canadian police are on the hunt for four individuals, suspected of a defrauding a local bitcoin company via "double spend" attacks on Bitcoin ATMs. CBC News reported March 12, 2019, that law enforcement officials are asking for useful information from the public leading to the arrest of the...

SlowMist representatives are actively looking for initiators of the Ethereum Classic 51% attack

Chinese security firm SlowMist said it could soon locate the initiators of the recent 51% attacks on Ethereum Classic (ETC). In an article on Medium of January 9, SlowMist points to three wallet addresses and a hash of four transactions, due to which, presumably, a lengthy attack was launched on the ETC blockchain. The company also confirmed the data published Coinbase cryptographic. Both companies said that as a result of attacks that began on January 5 at 19:58 UT, there was a double spend. According to SlowMist, seven transactions were rolled back from the network in the amount of 54,200 ETC (almost $ 270,000). SlowMist also reported that the attacks have already stopped, and the last one was recorded at 4:30 am UT on January ...