eth_getproof

How to use it

// yarn add @tatumio/tatum

import { TatumSDK, Haqq, Network } from '@tatumio/tatum'

const tatum = await TatumSDK.init<Haqq>({ network: Network.HAQQ })

const result = await tatum.rpc.getProof(
  '0x2C5B9a513bE2240e948a631bAaFB53cc0bEAcfda',
  ['0x0000000000000000000000000000000000000000000000000000000000000000'],
  'latest',
)

await tatum.destroy() // Destroy Tatum SDK - needed for stopping background jobs

Overview

The eth_getProof is an Haqq JSON-RPC method that retrieves the Merkle-Patricia proof for an account, storage key-value pairs, and account transaction count. It allows developers to verify the state of an account or storage value at a specific block without needing the entire Haqq state trie. This method is particularly useful for light clients or off-chain applications that require proof of an account's state or specific storage values.

Parameters

1. address - Data, 20 Bytes
   • The address of the account.
   • Example: "0x742d35Cc6634C0532925a3b844Bc454e4438f44e"
2. keys - Array of Data
   • An array of storage keys for which the proof should be generated.
   • Example: ["0x0000000000000000000000000000000000000000000000000000000000000000"]
3. blockNumber - Quantity or String
   • The block number for which the proof should be generated.
   • Example: "0x1" or "latest"

Return Object

The method returns an object containing the following fields:

1. accountProof - Array of Data
   • The serialized Merkle-Patricia proof for the account.
2. balance - Quantity
   • The balance of the account at the specified block.
3. codeHash - Data, 32 Bytes
   • The hash of the code for the account at the specified block.
4. nonce - Quantity
   • The transaction count of the account at the specified block.
5. storageProof - Array of Object
   • An array of storage proof objects, one for each requested key, containing the following fields:
     • key - Data, 32 Bytes: The storage key.
     • value - Quantity: The storage value.
     • proof - Array of Data: The serialized Merkle-Patricia proof for the key-value pair.

JSON-RPC Request and Response Examples

Request:

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "eth_getProof",
  "params": [
    "0x742d35Cc6634C0532925a3b844Bc454e4438f44e",
    ["0x0000000000000000000000000000000000000000000000000000000000000000"],
    "latest"
  ]
}

Response:

{
  "id": 1,
  "jsonrpc": "2.0",
  "result": {
    "accountProof": ["0x...", "0x...", "0x..."],
    "balance": "0xde0b6b3a7640000",
    "codeHash": "0x...",
    "nonce": "0x1",
    "storageProof": [
      {
        "key": "0x0000000000000000000000000000000000000000000000000000000000000000",
        "value": "0xde0b6b3a7640000",
        "proof": ["0x...", "0x...", "0x..."]
      }
    ]
  }
}