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On-chain Safety Education

Understand the chain.
Protect your wallet.

Onchain Diary is an independent Web3 safety education site: 116 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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116 Articles
232 Glossary Terms
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§ 01

Latest

Guides, tutorials, and deep dives.

Oct 11, 2026

FMMR Mining Scam: A Fake Pool Farmed 151 Wallets for Over 1.5M USDC — and the Permits Are Still Live Until 2030

A victim in China was groomed on Bilibili by a 'medical aesthetics professional' persona and led into a fake mining pool called Onchain at fmmrvip.click. His first 300 USDC deposit withdrew fine. Then three harvests in three weeks. On-chain forensics match his story line by line — including the cruelest detail: the 2,513 USDC his 'friend' chipped in was wired from the scam's own treasury three minutes before it reached him.

 Oct 10, 2026

The Ledger–CryptoBilis Hack: How Buying a Trusted Reseller Became the Attack

An authorized Ledger reseller was secretly acquired, its devices implanted, and an estimated $72M–$90M drained from buyers. The full timeline of a textbook supply-chain takeover.

 Oct 9, 2026

Fake Crypto Job Offers Explained: The $1.5B Hack That Started With One Recruiter Message

How fake crypto job offers work: the Bybit/Safe breach, malicious coding tests, and the red flags every Web3 job seeker should know.

 Oct 9, 2026

The $86M 'Ledger Hack': What the On-Chain Evidence Actually Shows

We independently traced the 10 flagged theft addresses in the October 9 Ledger wallet-draining reports. Verifiable losses: ~$27M — and Ledger's own response now points to a tampered-device supply chain, not a firmware breach.

 Oct 7, 2026

Abstract Chain Is Shutting Down: Bridge Out Before December 15 or Lose Access

Igloo Inc., the parent of Pudgy Penguins, is shutting down its Abstract L2 on December 15, 2026. Funds not bridged out by then become inaccessible. Official exit routes, the fake-migration scam wave, and how this differs from Blast.

 Oct 6, 2026

Crypto Task Scams Explained: How Easy-Money Jobs Turn Your Wallet Into a Money Mule

The task scam pays you first — that is the product. How the like-and-earn funnel documented by the FBI escalates into frozen withdrawals, and how the 'merchant account' job quietly turns your wallet into a laundering pipe for other victims' money.
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Featured series

One topic, covered end to end.

Start with: The 12-point checklist Verify any airdrop on-chain Why the claim button is dangerous
§ 03

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.

48 questions Instant scoring
Take the quiz → T-02

Onchain Security MBTI

Sixteen scenario questions sort you into one of sixteen security personas — hunter or prey — with a safety index and a shareable result card.

16 scenarios 16 persona types
Find your type →
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Start learning

A few terms to get you going — the full glossary has 232+.

Burner Wallet Wallet Wallet Address Wallet Wallet Passphrase Wallet Wrench Attack Security BIP-39 Wallet Derivation Path Wallet Entropy Security HD Wallet Wallet Public Key Wallet Nullifier Security Shielded Address Security Viewing Key Security
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Don't transact blind.

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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