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Smart contracts are small but highly error-prone programs that implementagreements between multiple parties. We present a reactive synthesis approachfor the automatic construction of smart contract state machines. Towards thisend, we extend temporal stream logic (TSL) with universally quantifiedparameters over infinite domains. Parameterized TSL is a convenient logic tospecify the temporal control flow, i.e., the correct order of transactions, aswell as the data flow of the contract's fields. We develop a two-step approachthat 1) synthesizes a finite representation of the - in general -infinite-state system and 2) splits the system into a compact hierarchicalarchitecture that enables the implementation of the state machine in Solidity.We implement the approach in our prototype tool SCSynt, which - within seconds- automatically constructs Solidity code that realizes the specified controlflow.

Reactive Synthesis of Smart Contract Control Flows