Best Ways to Verify Token Addresses: 6 Checks That Hold Up Against Real Scams
Six ways to verify a token address before you buy: official-source cross-checks, explorer verification, scam scanners, and how scammers fake each signal.
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Onchain Diary is an independent Web3 safety education site: 122 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.
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Fake Crypto Exchange Scams: Why the Balance Grows but the Withdrawal Never Comes
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.
The Task Scammer Who Lost 60 BTC to a Tampered Ledger Wallet
A task-scam operator kept 60 BTC of stolen proceeds in tampered Ledger wallets — drained in a single morning. A rare look at scammers getting scammed.
Denmark CPR Breach: 8.8M Identities Sat Behind a '123456' Password
Millions of citizen records with trivially weak passwords — and crypto accounts in the blast radius. What the breach exposed and what to do now.
Ledger Implants Reach European Retail: Two MediaMarkt Devices, One 'Eurasian Version' Antenna
Hardware implants found in Ledger devices at European retail; the chain delisted Ledger group-wide. What's verified, what's speculation, what to check.
Bitcoin Blackmail Emails Explained: The Password Is Real, the Video Is Not
Got an email with your real password demanding Bitcoin? The webcam video is fake. Here's how the scam works and what to do in the first hour.
Test yourself
Reading is half. The other half is recall.
T-01
The Yellow Paper Quiz
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.
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Sixteen scenario questions sort you into one of sixteen security personas: hunter or prey: with a safety index and a shareable result card.
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