HackerNoon explains the Harmony Horizon Bridge incident as a cross-chain bridge attack in which about $100 million in altcoins was siphoned from the bridge and swapped for ETH. The source frames a blockchain bridge as a mint-and-burn mechanism that locks tokens on one chain and issues equivalent tokens on another, making the theft an impact against assets moving between heterogeneous blockchains. The provided excerpt does not attribute the activity to Lazarus or another DPRK actor, so the summary should be treated as incident context rather than actor-attributed CTI.