add proof helpers

Cargo.toml

@@ -13,3 +13,5 @@ serde = { version = "1.0.143", features = ["derive"] }
 hex = "0.4.3"
 ssz-rs = { git = "https://github.com/ralexstokes/ssz-rs" }
 blst = "0.3.10"
+ethers = "0.17.0"
+jsonrpsee = { version = "0.15.1", features = ["full"] }

src/main.rs

@@ -3,22 +3,28 @@ use ssz_rs::prelude::*;
 use blst::{min_pk::*, BLST_ERROR};
 use consensus_client::*;
 use utils::*;
+use proof::*;
 
 pub mod consensus_client;
 pub mod utils;
+pub mod proof;
 
 #[tokio::main]
 async fn main() -> Result<()> {
 
-    let mut client = LightClient::new(
-        "http://testing.prater.beacon-api.nimbus.team",
-        "0x172128eadf1da46467f4d6a822206698e2d3f957af117dd650954780d680dc99"
-    ).await?;    
+    // let mut client = LightClient::new(
+    //     "http://testing.prater.beacon-api.nimbus.team",
+    //     "0x172128eadf1da46467f4d6a822206698e2d3f957af117dd650954780d680dc99"
+    // ).await?;    
+    // 
+    // client.sync().await?;
 
-    client.sync().await?;
+    // let payload = client.get_execution_payload().await?;
+    // println!("verified execution block hash: {}", hex::encode(payload.block_hash));
 
-    let payload = client.get_execution_payload().await?;
-    println!("verified execution block hash: {}", hex::encode(payload.block_hash));
+    let proof = get_proof("0xf6401adc23Faa6B9AD83eA8604CA7254CB7F53e7", 15365978).await?;
+    verify(&proof)?;
+    // println!("{:?}", proof);
 
     Ok(())
 }

src/proof.rs

@@ -0,0 +1,58 @@
+use ethers::utils::keccak256;
+use eyre::Result;
+use serde::Deserialize;
+use serde::de::Error;
+use jsonrpsee::{http_client::HttpClientBuilder, rpc_params, core::client::ClientT};
+use ethers::utils::rlp::RlpStream;
+use ethers::prelude::{U256, H256, Address};
+use super::utils::hex_str_to_bytes;
+
+pub async fn get_proof(address: &str, block: u64) -> Result<Proof> {
+    let rpc = "https://eth-mainnet.g.alchemy.com:443/v2/sUiZsY3BSTYXjSHIvPc9rGDipR7lAlT4";
+    let client = HttpClientBuilder::default().build(rpc)?;
+    let block_hex = format!("0x{:x}", block);
+    let params = rpc_params!(address, [""], block_hex);
+    Ok(client.request("eth_getProof", params).await?)
+}
+
+pub fn verify(proof: &Proof) -> Result<()> {
+
+    let account_encoded = encode_account(proof);
+    println!("{:?}", account_encoded);
+
+    let state_root = hex_str_to_bytes("0xeb5eb01bd4f503a5698d136c75b37ef2660d6842bf77d0453f2a7fa4a6780d91")?;
+    let address_hash = keccak256(proof.address);
+
+
+    Ok(())
+}
+
+fn encode_account(proof: &Proof) -> Vec<u8> {
+    let mut stream = RlpStream::new_list(4);
+    stream.append(&proof.nonce);
+    stream.append(&proof.balance);
+    stream.append(&proof.storage_hash);
+    stream.append(&proof.code_hash);
+    let encoded = stream.out();
+    encoded.to_vec()
+}
+
+#[derive(Deserialize, Debug)]
+#[serde(rename_all = "camelCase")]
+pub struct Proof {
+    address: Address,
+    balance: U256,
+    code_hash: H256,
+    nonce: U256,
+    storage_hash: H256,
+    #[serde(deserialize_with = "proof_deserialize")]
+    account_proof: Vec<Vec<u8>>,
+}
+
+fn proof_deserialize<'de, D>(deserializer: D) -> Result<Vec<Vec<u8>>, D::Error> where D: serde::Deserializer<'de> {
+    let branch: Vec<String> = serde::Deserialize::deserialize(deserializer)?;
+    Ok(branch.iter().map(|elem| {
+        hex_str_to_bytes(elem)
+    }).collect::<Result<_>>().map_err(D::Error::custom)?)
+}
+