U.S. House chamber during a congressional session. Source: TechGaged / Shutterstock Hooded figure making a shushing gesture. Source: TechGaged / Shutterstock Aztec Labs, a software development studio building a Layer 2 blockchain on Ethereum, is investigating another exploit involving one of its discontinued products after attackers drained around $2.2 million from an old payments rollup. The company said the affected system was a deprecated Stage 2 rollup, which it launched in 2021 and retired the following year. According to Aztec, the incident doesn’t affect its current network because the immutable contract can’t be paused or upgraded.