以下是基于您提供的内容整合的完整示例demo：

完整示例demo

1. 创建Rust项目并添加依赖

cargo new risc0_eth_demo
cd risc0_eth_demo

在Cargo.toml中添加：

[dependencies]
risc0-ethereum-contracts = "0.8"
risc0-zkvm = { version = "0.18", default-features = false }
ethers = { version = "1.0", features = ["full"] }

2. 编写zkVM斐波那契程序

// src/bin/fib_guest.rs
#![no_main]

use risc0_zkvm::guest::env;

risc0_zkvm::guest::entry!(main);

pub fn main() {
    // Read input from host
    let n: u32 = env::read();
    
    // Calculate nth Fibonacci number
    let mut a = 0;
    let mut b = 1;
    for _ in 0..n {
        let c = a + b;
        a = b;
        b = c;
    }
    
    // Commit result to journal
    env::commit(&a);
}

3. 编译zkVM程序

cargo build --release --target riscv32im-risc0-zkvm-elf

4. 生成证明的主程序

// src/main.rs
use risc0_zkvm::{default_prover, ExecutorEnv};
use risc0_ethereum_contracts::eth::seal::Seal;
use ethers::{prelude::*, utils::Ganache};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // 1. Generate proof
    let n = 10;
    let seal = generate_fib_proof(n)?;
    println!("Generated proof for fib({})", n);

    // 2. Setup Ethereum environment
    let ganache = Ganache::new().spawn();
    let wallet: LocalWallet = ganache.keys()[0].clone().into();
    let provider = Provider::try_from(ganache.endpoint())?;
    
    // 3. Deploy verifier contract
    let verifier_addr = deploy_verifier_contract(&provider, &wallet).await?;
    println!("Verifier deployed at: {:?}", verifier_addr);

    // 4. Verify proof on-chain
    let result = verify_on_chain(&provider, &wallet, verifier_addr, seal).await?;
    println!("Verification result: {}", result);

    Ok(())
}

fn generate_fib_proof(n: u32) -> Result<Seal, Box<dyn std::error::Error>> {
    let env = ExecutorEnv::builder()
        .write(&n)?
        .build()?;
    
    let prover = default_prover();
    let receipt = prover.prove_elf(env, include_bytes!("../target/riscv32im-risc0-zkvm-elf/release/fib_guest"))?;
    
    Ok(receipt.into_seal())
}

async fn deploy_verifier_contract(
    provider: &Provider<Http>,
    wallet: &LocalWallet,
) -> Result<Address, Box<dyn std::error::Error>> {
    // In production, use the actual deployment script
    // This is a simplified version for demo purposes
    let client = SignerMiddleware::new(provider.clone(), wallet.clone());
    let contract = ContractFactory::new(
        include_bytes!("../path/to/IRiscZeroVerifier.json"),
        client,
    );
    
    let contract = contract.deploy(())?.send().await?;
    Ok(contract.address())
}

async fn verify_on_chain(
    provider: &Provider<Http>,
    wallet: &LocalWallet,
    verifier_addr: Address,
    seal: Seal,
) -> Result<bool, Box<dyn std::error::Error>> {
    let client = SignerMiddleware::new(provider.clone(), wallet.clone());
    let verifier = Contract::new(
        verifier_addr,
        include_bytes!("../path/to/IRiscZeroVerifier.json"),
        client,
    );
    
    let tx = verifier.method::<_, bool>("verify", (seal.to_vec(), image_id, journal))?
        .gas(1000000)
        .send()
        .await?;
    
    Ok(tx)
}

5. Solidity验证合约

// contracts/FibonacciVerifier.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "risc0-ethereum-contracts/contracts/IRiscZeroVerifier.sol";

contract FibonacciVerifier {
    IRiscZeroVerifier public verifier;
    bytes32 public imageId;
    
    constructor(address _verifier, bytes32 _imageId) {
        verifier = IRiscZeroVerifier(_verifier);
        imageId = _imageId;
    }
    
    function verifyFibProof(
        uint256 n,
        bytes calldata seal
    ) external view returns (uint256 result) {
        // Compute expected result
        uint256 a = 0;
        uint256 b = 1;
        for (uint256 i = 0; i < n; i++) {
            uint256 c = a + b;
            a = b;
            b = c;
        }
        result = a;
        
        // Prepare journal data
        bytes memory journal = abi.encode(n, result);
        
        // Verify proof
        require(
            verifier.verify(seal, imageId, journal),
            "Proof verification failed"
        );
    }
}

6. 运行完整流程

# 1. Build zkVM program
cargo build --release --target riscv32im-risc0-zkvm-elf

# 2. Start Ganache (test blockchain)
ganache-cli

# 3. Run the demo
cargo run --release

关键点说明

1. zkVM程序：需要在no_std环境下编译为RISC-V二进制
2. 证明生成：使用default_prover在本地生成证明
3. 链上验证：通过智能合约验证证明的有效性
4. 数据流：输入数据→zkVM计算→生成证明→链上验证
5. 开发环境：建议使用Ganache作为开发测试链

注意：实际使用时需要替换以下内容：

• 正确的IRiscZeroVerifier.json合约ABI路径
• 实际部署的验证合约地址
• 正确的image_id（来自zkVM程序构建）