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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.

Stellar Open Protocol meeting discussing CAP 21 and CAP 40, which lay groundwork for payment channels. CAP 21 generalizes transaction preconditions to support relative time locks and other conditions; CAP 40 enables participants to exchange signatures for multiple transactions in one step.

Stellar protocol discussion on automated market makers (AMMs) focusing on asset authorization and revocation mechanisms. Two approaches debated: one mirroring existing offer revocation semantics, another requiring issuer opt-in for liquidity pool participation.

Tyler Vanderhoeven from SDF presented progress on Turing Signing Servers, a proposal for enabling decentralized transaction creation on Stellar through programmable smart contract-like functionality without modifying the core protocol.

Stellar Development Foundation hosted an open protocol meeting to discuss CAP 21, a draft proposal for generalized transaction preconditions. The CAP aims to enable payment channels, relative time locks, and time-delayed key recovery by extending account entries and replacing the time bounds field with more flexible preconditions.

Tyler Vanderhoeven presents SEP X, a proposal for Turing complete smart contracts on Stellar via decentralized Turing signing servers. These servers enable programmable transaction creation while maintaining Stellar's safety guarantees, offering functional feature parity with Ethereum without requiring assets to be first-class citizens.

Stellar Development Foundation held an open protocol discussion covering CAP 23 (claimable balances for two-part payments) and CAP 33 (sponsored reserves). Teams debated predicate tree recursion depth limits, SEP 30 compatibility issues, and downstream SDK/Horizon implementation readiness for Protocol 14.

Oleg Andreev from Stellar presents Slingshot and ZKVM, a modular suite combining zero-knowledge proofs, confidential transactions, and a programmable virtual machine to enable private, auditable blockchain transactions with customizable smart contract conditions.