Crypto Security Basics

A new scam is circulating among cryptocurrency users, and it looks surprisingly real. Victims receive a physical letter that appears to come from the hardware wallet company Ledger. The letter warns about a supposed “Quantum Resistance Security Update” and urges the recipient to scan a QR code.

Crypto security sometimes sounds complicated. Cold wallets, private keys, multi-sig, air-gapped devices. Yet the biggest losses often come from very simple mistakes. A recent case in South Korea proves it.

Ledger just dropped a thought-provoking educational video titled “AI Agent With a Wallet. What Could We Possibly Lose?” It dives straight into a future that feels closer than most people expect.

Charles Guillemet, CTO of Ledger, explains Ledger is critical for digital ownership.

On January 10, 2026, the cryptocurrency world was shaken by a social engineering attack that cost someone more than $282 million worth of Bitcoin and Litecoin.

Phishing is one of the biggest threats in crypto today. It does not rely on hacking blockchains or breaking encryption. It relies on tricking people (social engineering).

A compromised version of the Trust Wallet Chrome extension was released to users, containing malicious code that harvested sensitive wallet data. This version, identified as 2.68, was distributed through the Chrome Web Store and silently stole the seed phrases of users who unlocked or imported wallets. 

A crypto trader lost $50 million in an address poisoning attack recently. Address poisoning is one of the fastest-growing crypto scams, and it does not rely on hacking, malware, or broken blockchains.