Space and Time is the first trustless database for the EVM, enabling smart contracts to interact with historical, cross-chain, or offchain data as if it were natively accessible onchain.

ZK-SQL Execution from your Smart Contract

Execution of a ZK-proven query from your smart contract is as simple as sending your request along with a small payment to the QueryRouter contract.

In your smart contract, you simply:

• Import the QueryRouter interface (and token interfaces needed for payment/approval).
• Set the contract addresses for the chain you're on (see below).
• Authorize a small amount of SXT to cover payments (query execution, callback return, onchain verification, etc.).
• Convert your SQL statement into a hex query plan (you can do this in the SxT Chain App (Query Workbench)[https://chain.spaceandtime.io/tools/query-workbench]).
• Set query version to keccak256("latest"):
  • 0x5d7c83ff6d08efb2f110018d8b6814a4719a93273a3ea09ced5cfe0d5db1d001
• Send the request to QueryRouter.
• Implement your callback handler so results can be returned to your contract by the router executor.

To see this in action, use the SxT Chain App tutorials and generated contract examples.

Contract Addresses

Build, Test, and Learn in SxT Chain App

• SxT Chain App: https://chain.spaceandtime.io/
• Query Workbench: https://chain.spaceandtime.io/tools/query-workbench
• Deploy Query Contract tutorial: https://chain.spaceandtime.io/get-started/deploy-query-contract
• Result Decoder: https://chain.spaceandtime.io/tools/result-decoder