Attacker exploits Polkadot-based Hyperbridge to mint 1 billion bridged DOT, nets $237K

Attacker exploits Polkadot-based Hyperbridge to mint 1 billion bridged DOT, nets $237K

The Block April 13, 2026

Upbit and Bithumb have since temporarily suspended deposits and withdrawals of Polkadot’s DOT, citing signs of a security incident.