> ## Documentation Index
> Fetch the complete documentation index at: https://docs.chainstack.com/llms.txt
> Use this file to discover all available pages before exploring further.

# debug_intermediateRoots | Arbitrum

> Arbitrum API method that computes the intermediate state roots for a given block by re-executing all transactions. Arbitrum via Chainstack.

Arbitrum API method that computes the intermediate state roots for a given block by re-executing all transactions. For each transaction in the block, it returns the state root after that transaction was applied. This provides a detailed view of how the state trie evolves within a single block.

<Note>
  Learn how to [deploy a node](/docs/debug-and-trace-apis#arbitrum) with the debug and trace API methods enabled.
</Note>

<Warning>
  This method is available for post-Nitro blocks only (block 22,207,815 and later). For pre-Nitro blocks, use the `arbtrace_*` methods instead.
</Warning>

<Warning>
  This method re-executes all transactions in the block, which can be resource-intensive for blocks with many transactions.
</Warning>

<Check>
  **Get your own node endpoint today**

  [Start for free](https://console.chainstack.com/) and get your app to production levels immediately. No credit card required.

  You can sign up with your GitHub, X, Google, or Microsoft account.
</Check>

## Parameters

* `hash` — the hash of the block to compute intermediate roots for.
* `object` — (optional) tracing configuration:
  * `timeout` — the timeout for the computation. Defaults to `5s`. See [Go time format](https://pkg.go.dev/time#ParseDuration) for accepted values.
  * `reexec` — the number of blocks to re-execute to reconstruct historical state. Defaults to 128.

## Response

* `result` — an array of state root hashes (as hex strings), one per transaction in the block. Each root represents the state after the corresponding transaction was executed.

## `debug_intermediateRoots` code examples

<CodeGroup>
  ```javascript ethers.js theme={"system"}
  const ethers = require('ethers');
  const NODE_URL = "YOUR_CHAINSTACK_ENDPOINT";
  const provider = new ethers.JsonRpcProvider(NODE_URL);

  const debugIntermediateRoots = async (blockHash) => {
    const result = await provider.send("debug_intermediateRoots", [blockHash, {}]);
    console.log(result);
  };

  debugIntermediateRoots("0x5765eab677d93b81a1c29de804e115d0e4db8dd40e0deabcf187e4e0d047c758");
  ```

  ```python web3.py theme={"system"}
  from web3 import Web3
  node_url = "YOUR_CHAINSTACK_ENDPOINT"
  web3 = Web3(Web3.HTTPProvider(node_url))

  block_hash = "0x5765eab677d93b81a1c29de804e115d0e4db8dd40e0deabcf187e4e0d047c758"
  result = web3.provider.make_request('debug_intermediateRoots', [block_hash, {}])
  print(result)
  ```
</CodeGroup>

## Use case

The `debug_intermediateRoots` method is useful for verifying state transitions within a block. By computing the intermediate state root after each transaction, developers can identify exactly which transaction caused a state change and verify the correctness of state transitions. This is particularly valuable for building state verification tools and debugging state-related issues in smart contracts.


## OpenAPI

````yaml /openapi/arbitrum_node_api/debug_and_trace/debug_intermediateRoots.json POST /66f812de2a6724a75a51f60dd6f2a154
openapi: 3.0.0
info:
  title: Chainstack Node API
  version: 1.0.6
  description: >-
    This is an API for interacting with a Chainstack node using the
    debug_intermediateRoots method.
servers:
  - url: https://nd-954-882-037.p2pify.com
security: []
paths:
  /66f812de2a6724a75a51f60dd6f2a154:
    post:
      tags:
        - upload
      summary: debug_intermediateRoots
      operationId: debugIntermediateRoots
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                id:
                  type: integer
                  default: 1
                jsonrpc:
                  type: string
                  default: '2.0'
                method:
                  type: string
                  default: debug_intermediateRoots
                params:
                  type: array
                  items:
                    anyOf:
                      - type: string
                        title: Block Hash
                        description: The hash of the block.
                      - type: object
                        title: Tracing options
                  default:
                    - >-
                      0x5765eab677d93b81a1c29de804e115d0e4db8dd40e0deabcf187e4e0d047c758
                    - {}
      responses:
        '200':
          description: Returns intermediate state roots for each transaction in the block.
          content:
            application/json:
              schema:
                type: object
                properties:
                  jsonrpc:
                    type: string
                  id:
                    type: integer
                  result:
                    type: array
                    items:
                      type: string

````