This directory includes three example uses of Steel. Each example demonstrates a different concept of Steel.
This introductory example illustrates how to use Steel to directly query the balanceOf function of any ERC20 token
contract, providing a verifiable proof of a user's token balance.
Explore a more advanced interaction between Steel and a custom Ethereum smart contract. This counter contract utilizes off-chain Steel proofs to:
- Increment a counter based on user-submitted proofs.
- Verify ERC20 token ownership (minimum 1 token required) before incrementing.
- Leverage RISC Zero as a coprocessor for efficient proof generation and verification.
This example illustrates how to use Steel to query and process events.
This example computes the total USDT transferred in a block by evaluating the ERC20 Transfer event emitted by the corresponding contract.
This example shows how the Steel library can be used to call multiple view functions of a contract. This example generates a proof of a Compound cToken's APR (Annual Percentage Rate), showcasing the potential for on-chain verification of complex financial metrics.
ERC20 Balance Query using op-steel
This example shows how to use op-steel to query the balanceOf function of an ERC20 token on OP, providing a proof
that can be verified on OP.
This example shows how to use op-steel to query the balanceOf function of an ERC20 token on Ethereum and how the
generated proof can be verified on OP.
This example shows how to use op-steel to query the balanceOf function of an ERC20 token on OP and how the generated
proof can be verified on Ethereum.