LayerZero: STG-to-ZRO exchange will close on December 15, and the ZRO validator threshold will be raised to 4/4.

LayerZero will close the STG-to-ZRO swap window on Dec. 15, 2026, after which STG conversions will no longer be supported; the team said it will work with exchanges, market makers, custodians and ecosystem partners to drive conversions before the deadline. Ahead of the Zero mainnet launch, LayerZero will also transfer ZRO contract ownership to its own signing solution, OneSig, and raise the ZRO decentralized verifier network (DVN) configuration to 4/4, meaning all four DVNs must approve a transaction for it to validate. The swap deadline matters because it sets a hard cutoff for holders of the legacy STG token to migrate into ZRO, while the 4/4 DVN change tightens security assumptions on ZRO verification ahead of the new chain. What to watch next is whether exchanges and custodians complete STG conversion support before December 2026 and how the stricter DVN setup affects ZRO transaction validation once the Zero mainnet goes live.