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.
Tyler Vanderhoeven discusses a precept proposal for Turing complete smart contracts on Stellar through Turing signing servers (SEP X). The proposal addresses Ethereum's market dominance in finance by enabling decentralized transaction creation on Stellar, complementing existing decentralized transaction execution. Turing signing servers are disinterested but incentivized third parties that execute programmable contracts to generate signed transactions without executing them. Multiple servers running the same contract with multisig thresholds prevent collusion while ensuring security. Examples include vending machines, oracle-based contracts, payment filters, wager pools, and recurring revenue models. The approach prioritizes safety over liveness, giving users final control over transaction submission while maintaining trust minimization through cryptographic guarantees rather than relying on contract creator goodwill.