Cryptocurrency
Blockchain hashing, wallets and on-chain incidents. Clear-eyed coverage of how crypto works under the hood, the security trade-offs, and the hacks and exploits worth learning from.
Hemi Reentrancy Bug Drains 124.5M Tokens for $255K [2026]
A ten-year-old bug just resurfaced on a Bitcoin layer-2 network, and it barely made a dent. On September 7, 2026, an attacker drained 124.5 million HEMI tokens from…
Bitcoin Multisig Wallet Setup With Sparrow: 12 Steps [2026]
A single hardware wallet protects you from remote hackers. It does nothing if you drop it in a house fire, lose the seed phrase, or get hit by…
21 Banks Plan Dollar Stablecoin as Rules Tighten [2026]
Twenty-one of the world’s largest banks and asset managers, including Goldman Sachs, Citi, Bank of America, Deutsche Bank and UBS, said on September 1, 2026 that they will…
Signature Replay Attack Testing: 12 Foundry Steps, 90 Min [2026]
Every audited smart contract tutorial on this site so far has covered reentrancy, flash loan oracle attacks, and access control gaps. There’s a fourth bug class that drains…
DeFi Price Manipulation Exploits Triple to 32 [2026]
DeFi lending just had its worst year yet for a specific kind of theft: the price manipulation exploit. Blockchain intelligence firm TRM Labs counted 32 price-manipulation attacks in…
Shamir Secret Sharing for Bitcoin Seeds: 12 Steps [2026]
Roughly 2.3 to 3.7 million bitcoin, worth hundreds of billions of dollars at current prices, sit in wallets nobody can open anymore. Chainalysis and Ledger Academy both point…
Stolen Keys Beat Code Bugs as DeFi Hacks Hit $1.3B [2026]
Crypto security teams spent most of the last few years bracing for the next reentrancy bug or oracle manipulation exploit. That threat model is now out of date.…
Notional Finance Exploit Drains $1.73M via 2^128 Bug [2026]
A number that should never exist just cost a DeFi lending protocol $1.73 million. On September 4, 2026, an attacker drained a legacy escrow contract on Notional Finance…
$240M Bitcoin Heist: Lam Faces 14 Years, 18 Charged [2026]
Malone Lam is set to stand before a federal judge in Washington, D.C. on September 9, 2026, and change his plea to guilty in what prosecutors call the…
Access Control Bugs Cost $953M: Test in 12 Steps [2026]
Access control bugs quietly became the most expensive category of smart contract failure. OWASP’s 2026 Smart Contract Top 10 ranks access control vulnerabilities at #1, tying them to…
