eth_getProof - Ethereum

Example code for the eth_getProof JSON RPC method. Сomplete guide on how to use eth_getProof JSON RPC in GetBlock Web3 documentation.

This method returns a Merkle-Patricia proof for an account and (optionally) a set of storage slots, per EIP-1186. The proof allows verifiers to cryptographically validate account state (nonce, balance, code hash, storage root) and specific storage values against a known state root — the foundation for light clients, cross-chain state proofs, and trust-minimized bridges.

Parameters

Parameter	Type	Required	Description
address	string	Yes	20-byte address to prove (hex-encoded with 0x prefix)
storageKeys	array of string	Yes	Array of 32-byte storage keys to include proofs for (empty array for account-only proof)
blockParameter	string	Yes	Block number in hex, or latest, earliest, pending, finalized, safe

Request

cURL

curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getProof",
    "params": [
        "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
        [
            "0x0000000000000000000000000000000000000000000000000000000000000000"
        ],
        "latest"
    ],
    "id": "getblock.io"
}'

Axios

example.js

const axios = require('axios');

const response = await axios.post('https://go.getblock.io/<ACCESS-TOKEN>/', {
    jsonrpc: '2.0',
    method: 'eth_getProof',
    params: [
        "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
        [
            "0x0000000000000000000000000000000000000000000000000000000000000000"
        ],
        "latest"
    ],
    id: 'getblock.io'
}, {
    headers: { 'Content-Type': 'application/json' }
});

console.log(response.data.result);

Request

example.py

import requests

response = requests.post(
    'https://go.getblock.io/<ACCESS-TOKEN>/',
    headers={'Content-Type': 'application/json'},
    json={
        'jsonrpc': '2.0',
        'method': 'eth_getProof',
        'params': [
            "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
            [
                "0x0000000000000000000000000000000000000000000000000000000000000000"
            ],
            "latest"
        ],
        'id': 'getblock.io'
    }
)

print(response.json())

Rust

example.rs

use reqwest::Client;
use serde_json::{json, Value};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();
    
    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&json!({
            "jsonrpc": "2.0",
            "method": "eth_getProof",
            "params": [
                "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
                [
                    "0x0000000000000000000000000000000000000000000000000000000000000000"
                ],
                "latest"
            ],
            "id": "getblock.io"
        }))
        .send()
        .await?
        .json::<Value>()
        .await?;
    
    println!("Result: {}", response["result"]);
    Ok(())
}

Response

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": {
        "address": "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
        "accountProof": [
            "0xf90211a01dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347...",
            "0xf90211a08a2b1c9d8e7f6a5b4c3d2e1f0a9b8c7d6e5f4a3b2c1d0e9f8a7b6c5d4e3f2a1b..."
        ],
        "balance": "0x0",
        "codeHash": "0xa5f2a63f7c2c07681d05f4a3ce4bc9fdd7f6c1a2b3e4d5c6f7a8b9c0d1e2f3a4",
        "nonce": "0x1",
        "storageHash": "0xd7f3b2c8e6a1f4b5c9d0e7f8a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1",
        "storageProof": [
            {
                "key": "0x0000000000000000000000000000000000000000000000000000000000000000",
                "value": "0xa",
                "proof": [
                    "0xf90111a09b8c7d6e5f4a3b2c1d0e9f8a7b6c5d4e3f2a1b09b8c7d6e5f4a3b2c1d0e9f8a7..."
                ]
            }
        ]
    }
}

Response Parameters

Parameter	Type	Description
jsonrpc	string	JSON-RPC protocol version ("2.0")
id	string	Request identifier matching the request
result.address	string	The proven address
result.accountProof	array of string	Merkle-Patricia proof nodes for the account, from root to leaf
result.balance	string	Account balance (wei, hex)
result.codeHash	string	keccak256 of the deployed bytecode (or 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 for EOAs)
result.nonce	string	Account nonce (hex)
result.storageHash	string	Root of the account's storage trie
result.storageProof	array of object	Per-slot storage proofs (empty if no storage keys requested)
result.storageProof[].key	string	The storage key
result.storageProof[].value	string	The value at that slot
result.storageProof[].proof	array of string	Merkle-Patricia proof nodes for the slot

Use Cases

• Trust-Minimized Bridges: Cross-chain messaging protocols verify Ethereum state on other chains via Merkle proofs

• Light Client Validation: Light clients confirm specific account or storage values without downloading full state

• Historical State Attestations: Zero-knowledge proof systems attest to Ethereum state as inputs for off-chain computation

• Storage-Value Proofs: Prove a specific ERC-20 balance or governance vote at a historical block for airdrops or snapshots

Error Handling

Error Code	Message	Description
-32602	Invalid params	Address or storage keys malformed
-32603	Internal error	Node failed to generate the proof (usually indicates state pruning of the requested block)

Web3 Integration

Ethers.js

ethers-example.js

import { ethers } from 'ethers';

const provider = new ethers.JsonRpcProvider('https://go.getblock.io/<ACCESS-TOKEN>/');

const proof = await provider.send('eth_getProof', [
    '0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2',
    ['0x0000000000000000000000000000000000000000000000000000000000000000'],
    'latest'
]);
console.log('Balance:', proof.balance);
console.log('Storage hash:', proof.storageHash);
console.log('Account proof length:', proof.accountProof.length);
console.log('Storage proof for slot 0:', proof.storageProof[0]);

Viem

viem-example.js

import { createPublicClient, http } from 'viem';
import { mainnet } from 'viem/chains';

const client = createPublicClient({
    chain: mainnet,
    transport: http('https://go.getblock.io/<ACCESS-TOKEN>/'),
});

const proof = await client.getProof({
    address: '0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2',
    storageKeys: ['0x0000000000000000000000000000000000000000000000000000000000000000'],
});
console.log('Balance:', proof.balance);
console.log('Storage hash:', proof.storageHash);
console.log('Account proof length:', proof.accountProof.length);