Stellar Development Foundation discusses CAP 21, a core advancement proposal that enables payment channels on Stellar. The team addresses outstanding technical questions about account extensions, transaction validation, and preconditions to move toward acceptance.
In this Stellar Open Protocol discussion, the team reviews CAP 21, a technical proposal that lays groundwork for building payment channels on Stellar. Payment channels allow multiple parties to transact securely off-chain and settle periodically on-chain, enabling high-volume use cases. The meeting covers several outstanding issues: whether to make the last-modified sequence number tracking opt-in via a flag (decided against due to usability and security concerns), keeping timepoints unsigned for consistency, clarifying transaction forwarding rules to prevent network flooding attacks, and deciding whether to restrict combining min-sequence-number and min-ledger-age conditions in the same transaction. The team identifies concrete action items for protocol refinement and plans to move some design decisions to offline discussion before moving toward acceptance.