Fusaka Down: Validator Client Glitch Causes $1.07M ETH Loss Overnight

Solstice team responds to incident on December 4 at 00:47 CET. One validator client (VC#18) running Lighthouse v8.0.1 was rejecting attestations with "invalid signature" errors due to a failed Docker Compose restart. Estimated financial impact is $1,077.2 ETH. Version mismatches between VC#18 and other nodes (v1.35.3, v25.11.1, v1.10.1) caused protocol-level errors. Incident lasted 6 hours and 35 minutes.