Browsing: Rollback

A blockchain is treated as a ledger you can only add to at the end. That very promise is up for debate whenever a protocol, hit by an attack, starts weighing a rollback. Because a rollback does not erase only the attack. It also erases the purchases and transfers of uninvolved holders.

Harmony has moved from considering a rollback to publishing the exact checkpoints it plans to use after an attacker forged trillions of ONE tokens. The recovery decision will discard legitimate post-checkpoint activity as well as the malicious state, making it one of the most disruptive options available to a live blockchain.