@ -2,7 +2,52 @@
Having used the `Decider` from `decider_eth.rs` , we can now verify it in Ethereum's EVM.
First we need to generate the Solidity contracts that verify the Decider proofs. Use the [solidity-verifiers-cli ](https://github.com/privacy-scaling-explorations/sonobe/tree/main/cli ) tool
This can be done either by using the `solidity-verifiers-cli` or directly in rust code.
## Using the CLI to generate the Solidity verifier
Use the [solidity-verifiers-cli ](https://github.com/privacy-scaling-explorations/sonobe/tree/main/cli ) tool
```
> solidity-verifier-cli -p nova-cyclefold -d ./folding-verifier-solidity/assets/G16_test_vk_data
```
## Generating the Solidity verifier in rust
Assuming that we already have our `Decider` initialized, we can now
```rust
// prepare the call data
let function_selector =
get_function_selector_for_nova_cyclefold_verifier(nova.z_0.len() * 2 + 1);
let calldata: Vec< u8 > = prepare_calldata(
function_selector,
nova.i,
nova.z_0,
nova.z_i,
& nova.U_i,
& nova.u_i,
proof,
)
.unwrap();
// prepare the setup params for the solidity verifier
let nova_cyclefold_vk = NovaCycleFoldVerifierKey::from((g16_vk, kzg_vk, f_circuit.state_len()));
// generate the solidity code
let decider_solidity_code = get_decider_template_for_cyclefold_decider(nova_cyclefold_vk);
// verify the proof against the solidity code in the EVM
let nova_cyclefold_verifier_bytecode = compile_solidity(& decider_solidity_code, "NovaDecider");
let mut evm = Evm::default();
let verifier_address = evm.create(nova_cyclefold_verifier_bytecode);
let (_, output) = evm.call(verifier_address, calldata.clone());
assert_eq!(*output.last().unwrap(), 1);
// save smart contract and the calldata
use std::fs;
fs::write( "./examples/nova-verifier.sol", decider_solidity_code.clone()).unwrap();
fs::write("./examples/solidity-calldata.calldata", calldata.clone()).unwrap();
let s = solidity_verifiers::utils::get_formatted_calldata(calldata.clone());
fs::write("./examples/solidity-calldata.inputs", s.join(",\n")).expect("");
```
You can find the full flow at [examples/full_flow.rs ](https://github.com/privacy-scaling-explorations/sonobe/blob/main/examples/full_flow.rs ).