zks_getProof - zkSync

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

Generates Merkle proofs for one or more storage values associated with an account. Unlike Ethereum's two-level hexadecimal trie, zkSync Era uses a single-level full binary tree with 256-bit keys — proofs are batch-anchored rather than block-anchored, so the third parameter is an L1 batch number.

Parameters

Parameter	Type	Required	Description
address	string	Yes	20-byte account address to fetch storage values and proofs for
storageKeys	array of string	Yes	Array of 32-byte storage keys to prove
l1BatchNumber	integer	Yes	L1 batch number at which the proof is anchored

Request Example

cURL

curl --location --request POST 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "zks_getProof",
    "params": [
        "0x0000000000000000000000000000000000008003",
        [
            "0x8b65c0cf1012ea9f393197eb24619fd814379b298b238285649e14f936a5eb12"
        ],
        354895
    ],
    "id": "getblock.io"
}'

JavaScript (Axios)

import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "zks_getProof",
    "params": [
        "0x0000000000000000000000000000000000008003",
        [
            "0x8b65c0cf1012ea9f393197eb24619fd814379b298b238285649e14f936a5eb12"
        ],
        354895
    ],
    "id": "getblock.io"
});

const config = {
    method: 'post',
    url: 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/',
    headers: {
        'Content-Type': 'application/json'
    },
    data: data
};

axios(config)
    .then(response => console.log(JSON.stringify(response.data, null, 2)))
    .catch(error => console.log(error));

Python (Requests)

import requests
import json

url = "https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/"

payload = json.dumps({
    "jsonrpc": "2.0",
    "method": "zks_getProof",
    "params": [
        "0x0000000000000000000000000000000000008003",
        [
            "0x8b65c0cf1012ea9f393197eb24619fd814379b298b238285649e14f936a5eb12"
        ],
        354895
    ],
    "id": "getblock.io"
})

headers = {
    'Content-Type': 'application/json'
}

response = requests.post(url, headers=headers, data=payload)
print(response.text)

Rust (Reqwest)

use reqwest::Client;
use serde_json::json;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();

    let payload = json!({
        "jsonrpc": "2.0",
        "method": "zks_getProof",
        "params": [
                "0x0000000000000000000000000000000000008003",
                [
                        "0x8b65c0cf1012ea9f393197eb24619fd814379b298b238285649e14f936a5eb12"
                ],
                354895
        ],
        "id": "getblock.io"
});

    let response = client
        .post("https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&payload)
        .send()
        .await?;

    let result: serde_json::Value = response.json().await?;
    println!("{:#?}", result);

    Ok(())
}

Response Example

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": {
        "address": "0x0000000000000000000000000000000000008003",
        "storageProof": [
            {
                "key": "0x8b65c0cf1012ea9f393197eb24619fd814379b298b238285649e14f936a5eb12",
                "proof": [
                    "0xe3e8e49a998b3abf8926f62a5a832d829aadc1b7e059f1ea59ffbab8e11edfb7"
                ],
                "value": "0x0000000000000000000000000000000000000000000000000000000000000060",
                "index": 27900957
            }
        ]
    }
}

Response Parameters

Field	Type	Description
result.address	string	Account address (echoed)
result.storageProof	array	Array of storage proofs, one per requested key
result.storageProof[].key	string	Storage key (echoed)
result.storageProof[].value	string	Value at the key at the time of the specified L1 batch
result.storageProof[].index	integer	1-based index of the entry in the Merkle tree
result.storageProof[].proof	array of string	Merkle path from leaf to root (hashes only; root is published on L1)

Use Cases

• Light client state verification against zkSync's binary tree

• Cross-chain bridges proving zkSync state

• Trust-minimized storage reads for audits and bridges

Error Handling

Status Code	Error Message	Cause
403	Forbidden	Missing or invalid <ACCESS-TOKEN>
-32602	Invalid params	Request parameters are missing or malformed
429	Too Many Requests	Rate limit exceeded for your plan

SDK Integration

zksync-ethers (JavaScript)

import { Provider } from 'zksync-ethers';

const provider = new Provider('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/');

// zksync-ethers exposes both standard Ethereum methods and zks_* methods
// through typed accessors. For raw access:
const result = await provider.send('zks_getProof', ["0x0000000000000000000000000000000000008003", ["0x8b65c0cf1012ea9f393197eb24619fd814379b298b238285649e14f936a5eb12"], 354895]);
console.log(result);

zksync2-python (Python)

from zksync2.module.module_builder import ZkSyncBuilder

zk_web3 = ZkSyncBuilder.build('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/')

# zksync2-python exposes the JSON-RPC layer directly.
result = zk_web3.zksync._zks_endpoints if 'zks_getProof'.startswith('zks_') else None
# Or call any method generically:
result = zk_web3.provider.make_request('zks_getProof', ["0x0000000000000000000000000000000000008003", ["0x8b65c0cf1012ea9f393197eb24619fd814379b298b238285649e14f936a5eb12"], 354895])
print(result)