Stellar protocol meeting discussing CAP 67 on unified event emissions for classic and Soroban assets, and CAP 63 on parallel transaction execution via staged transaction sets with TTL update semantics changes.
The Stellar protocol development team presented two major capability proposals. CAP 67 aims to emit events in a unified format across classic operations and Soroban contracts, enabling balance tracking via event streams. Key changes include removing admin from SAC mint/clawback events, fixing transfer/mint/burn event semantics for issuer operations, and introducing new address types for claimable balances, liquidity pools, and MUX accounts. The team discussed memo handling and whether to include memo information in events. CAP 63 introduces a staged transaction set structure to enable parallel transaction execution while maintaining determinism. Transactions are grouped into stages and clusters based on data dependencies, allowing independent clusters to run on separate threads. The proposal includes TTL update semantics changes where read-only footprint TTL updates are reconciled after all transactions execute, requiring indexers to never decrease observed TTLs.