Why the latest Bitcoin hack hurt more than most | Fortune

After Coldcard Was Hacked, $15 Billion in Bitcoin Moved to Safety - Decrypt

Coldcard exploit (firmware RNG bug since March '21) drained ~2,100 BTC; 233,000 BTC moved to multisig and self-custody. The 100x migration-to-theft ratio proves self-custody's resilience: attackers' slow per-address drain let holders respond, unlike exchange breaches.