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The leak of French tax data affects nearly 678,000 people, which may exacerbate the risk of violent attacks against cryptocurrency holders

The French Minister of Finance confirmed that hackers breached the French Public Finance Directorate system at the end of June and stole personal and corporate taxpayer data. According to the platform FrenchBreaches, which tracks cyberattacks in France, this incident affected approximately 678,437 people, equivalent to about 1% of the French population, but the exact number is still under investigation and has not been finally confirmed.The leaked data reportedly includes sensitive information such as names, birth dates, home addresses, phone numbers, email addresses, tax identification information, and income data. Among them, nearly 27,000 individuals had tax incomes of at least 100,000 euros, 386 exceeded 1 million euros, and another 8 exceeded 10 million euros. Reports indicate that the database has been sold on the dark web market for thousands of euros. The attackers, calling themselves ZeroBytes, claimed they extracted the relevant records using an internal search tool, which was only discovered later when access was cut off.This incident has raised concerns in the cryptocurrency industry, as there has been a noticeable increase in "wrench attack" violent robbery incidents targeting cryptocurrency holders in France in recent years. If high-income individuals' addresses and contact information are leaked, it could provide criminals with a more precise target list.

153 stolen addresses contain 132.95 BTC, and researchers are still unable to reproduce the Coldcard attacker's seed

According to monitoring by Bitcoin News, new research published by @PraveenPerera shows that Coldcard attackers seem to first identify addresses with vulnerabilities, then sort them by the amount of Bitcoin held, starting to transfer in batches from the addresses with the highest holdings. The transfer software used was relatively crude.One address had 225 spendable UTXOs, and the attackers extracted exactly the latest 200, leaving the earliest 25, which included a UTXO worth 0.16 BTC. This aligns perfectly with the limitation of a blockchain API investigated by researchers, which defaults to returning 200 records, indicating that the attackers may have failed to load the next page of data. The software even spent a UTXO of 294 satoshis, reportedly increasing the transaction fee by about 2040 satoshis, with the spent amount significantly higher than the value of the UTXO itself.The authors of the study believe that the builders of this tool may have a better understanding of the account balance system than of the Bitcoin UTXO model. Although the attackers seem to have obtained the complete seed of the victims, at least 75 BTC still remain in other addresses derived from the same seed. The biggest suspicion currently is that among the 153 stolen addresses, there are still 132.95 BTC, and researchers have been unable to reproduce the seed behind these addresses, so it cannot be ruled out that the attackers obtained undisclosed private device data or candidate data.
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