Stellar’s Bell Upgrade Goes Live on Testnet Ahead of Mainnet Vote

The notable detail is the optional post-quantum signature verification for smart contracts, which puts a quantum-resistance question into Stellar's contract layer rather than leaving it at the protocol's edges. Because wallets and indexers must update, the testnet phase is a coordination test as much as a technical one — uneven readiness across that tooling is the usual source of friction at mainnet. The pending validator vote is the real gate, and whether the optional feature sees adoption once live is the open question.