On-chain Safety Education
Onchain Diary is an independent Web3 safety education site: 126 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.
The NEM (NemTokenV2) token on BNB Chain lost $821,920 to a contract logic flaw. How the pendingLpSellRecycle accounting bug was looped 42 times against PancakeSwap.
The Fearless Wallet browser extension sent private keys to an attacker server for 20 months. How the TON-camouflaged backdoor worked and what victims should do.
The Ledger implant hack stands at $102M from 335 wallets, two weeks on, zero arrests. Recap: the numbers, the device, the money trail, what to check now.
A rescue bot finalized the Cetus hacker's 17-month-old bridge claims and paid out $392K. Why dormant bridge claims are live liabilities for every chain.
Six ways to verify a token address before you buy: official-source cross-checks, explorer verification, scam scanners, and how scammers fake each signal.
The dashboard shows profit, the withdrawal is frozen, and support wants a fee. How fake crypto exchanges work, the deposit-address test that exposes them, and what to do now.
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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