Crypto Hacks and Security, Page 7 of 21

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Bitcoin Lost to a Scam: What Counts as a Tax Loss in Austria

Lost bitcoin to a scam? Why Austria generally does not recognise the damage as a tax loss for privately held assets, and when compensation payments start to matter.

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Ein Bolzenschneider durchtrennt einen massiven Messingschlüssel auf einer Werkbank, daneben eine Metallmünze mit rautenförmigem Symbol

Revoke Token Approvals on Ethereum: A Revocation Now Costs 0.52 Cents

Every decentralized exchange, every lending pool and every bridge asks for a token approval, and it keeps running after the swap is done. We counted 5,910 approvals and worked out what a revocation really costs today.

last month

Rotes Wachssiegel mit geometrischem Prägemuster auf einem gefalteten Dokument, daneben eine aufrecht stehende Metallmünze mit Bitcoin-Prägung, im Hintergrund eine Balkenwaage

Reporting Duty for Wallet Makers: What Has Applied Since September 11, 2026

Since September 11, 2026, anyone offering a wallet commercially in the EU must report an actively exploited vulnerability within 24 hours and inform the affected users. What Article 14 of the EU Cyber Resilience Act requires, where the limit of interpretation lies, and what you should take from it for your own custody.

last month

Metallmünze mit Bitcoin-Zeichen steckt in einem gläsernen Rohrpostrohr fest, dahinter ein geschlossenes Messingventil

Chainflip Hack on Tron: How to Check Whether Your USDT Swap Is Still Stuck

An attacker drained 736,442 USDT through Chainflip's Tron rail on September 12, 2026, and trading has been at a standstill ever since. On September 13 we measured for ourselves which functions of the protocol are switched off and which are still running.

last month

Silbermünze zur Hälfte in einem Eisblock eingeschlossen, daneben eine Münze mit eingeprägtem Bitcoin-Zeichen

Tokenized Assets on Solana: How to Check Whether Your Token Can Be Frozen or Clawed Back

At Dominion Market, SILV holdings were removed from wallets on September 11 after an exploit. Our query of 32 tokenized assets on Solana shows that every single one carries this permission, and how you can read it up yourself.

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Stählerne Bogenbrücke bei Nacht mit herausgebrochenem Mittelsegment, davor eine schwere Münze mit eingeprägtem Bitcoin-Zeichen

Symbiosis Hack: How to Check Whether Your Bridged Bitcoin Can Still Get Out

An attacker minted billions of unbacked syBTC on the cross-chain bridge Symbiosis and pulled out roughly $336,000. We checked for ourselves on September 12 which routes are still running: the way into the bridge is suspended, the way out is open.

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Aufgeschlagenes Ausweisheft und ein Stapel Kontoauszüge auf einem dunklen Schreibtisch unter einer Arbeitsleuchte, darauf eine Metallmünze mit Bitcoin-Prägung

Revolut Data Breach: Am I Affected, and What About My Bitcoin History?

After a forged government request, Revolut handed identity documents, account statements and complete Bitcoin transaction histories to an unauthorised party. Here is how to establish whether you are affected, and which protective measure actually achieves anything in this case.

last month

Goldene Bitcoin-Münze auf einer Steinbrüstung vor einem nachts angestrahlten klassizistischen Behördengebäude mit Säulenportal

BaFin Warnings in September: How to Check in Three Minutes Whether a Crypto Provider Holds Authorisation

Twelve consumer notices in ten days, five of them on crypto-asset services and two with the entry point in WhatsApp or Telegram. We evaluated all twelve notices ourselves and show the check that takes you three minutes.

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Fünf schwere Metallmarken mit eingeprägtem Bitcoin-Zeichen auf dunklem Stein, eine davon aus hohlem Blech und eingebrochen

Osmosis Freezes allBTC: How to Check Whether Your Bridged Bitcoin Is Still Backed

A double-spend on the Nomic chain has written off around 36 percent of the backing behind the pooled token allBTC, and depositors who never touched nBTC are caught up in it too. We counted the backing basket ourselves on September 11, 2026 and show how to recalculate your own share.

last month

Einplatinen-Computer mit offenem Gehäuse und eingestecktem Netzwerkkabel auf dunkler Werkbank, davor eine Münze mit Bitcoin-Zeichen

Alby Hub Security Flaw: How to Check Whether Your Bitcoin Lightning Node Is Reachable From the Internet

Alby confirmed a critical flaw in Alby Hub v1.7.0 through v1.18.5 on September 9, 2026; it is only exploitable if the management interface sits openly on the internet. What to check on your node, why the fix is a good twelve months older than the warning, and which step comes before the update.

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