On-chain Safety Education
Onchain Diary is an independent Web3 safety education site: 135 deep-dive articles, a 232-term glossary, and the complete BIP-39 wordlist: covering crypto scams, smart contract security, and on-chain analysis. No jargon. No sign-up. No tools to install. Just the knowledge you need to stop getting rekt.
Guides, tutorials, and deep dives.
An attacker reused one small Optimism deposit to forge five withdrawal receipts and drain Ankr's Ethereum bridge. The mechanism is a lesson in why a valid signature is not proof an event happened, and why the pause flag stayed unset.
A Web3Auth flaw reached the private keys behind Google and Apple logins and moved $6 million out of 44,000 Keplr wallets. What the rescue transfers mean, what is still unknown, and what affected users should do.
Binance's initial incident report traces the theft to a poisoned Homebrew install, a fake recruiter interview and an internal AI tool. What the timeline shows, what $2.85 billion frozen actually means, and what is still unexplained.
Token-2022 tokens carry mint-level powers that classic SPL tokens never had. Check five extensions before you buy: permanent delegate, transfer hook, default frozen, pausable, transfer fee.
The FBI blames North Korea's TraderTraitor. Here is how the Binance billions are being laundered through Tron and Solana, what froze, and why 90% covered is not 90% recovered.
Binance hot wallets lost 167,464 ETH and 1.6B USDT in minutes. The chain shows a signed EIP-7702 delegation, not a broken contract, and 195,460 ETH is still sitting in a fresh wallet.
Reading is half. The other half is recall.
Every question is drawn strictly from the Yellow Paper's own text. No outside knowledge required: if you've read it, you can pass it.
Take the quiz → T-02Sixteen scenario questions sort you into one of sixteen security personas: hunter or prey: with a safety index and a shareable result card.
Find your type →A few terms to get you going: the full glossary has 232+.
Whether you're new to crypto or deep into DeFi, understanding how scams work is the best defense. Every guide here is free.
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