On-chain Safety Education
Onchain Diary is an independent Web3 safety education site: 130 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.
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.
A malicious Electrum server replaced a pending payment with one paying itself. Version 4.8.3 now verifies signatures. Upgrade and verify addresses.
Keystone says a third party took names, addresses and order details after unauthorised access on Oct 20. No seed or card data. What to do now.
Initia halted its L1 and all rollups on Oct 23 after an attacker spoofed MoveVM state, credited himself unbacked tokens and bridged ~$2.7M in WETH, AUSD0 and USDC to Ethereum. What is confirmed, what is not.
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.
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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