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POST
/
66f812de2a6724a75a51f60dd6f2a154
debug_intermediateRoots
curl --request POST \
  --url https://nd-954-882-037.p2pify.com/66f812de2a6724a75a51f60dd6f2a154 \
  --header 'Content-Type: application/json' \
  --data '
{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "debug_intermediateRoots",
  "params": [
    "0x5765eab677d93b81a1c29de804e115d0e4db8dd40e0deabcf187e4e0d047c758",
    {}
  ]
}
'
{
  "jsonrpc": "<string>",
  "id": 123,
  "result": [
    "<string>"
  ]
}
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.
Learn how to deploy a node with the debug and trace API methods enabled.
This method is available for post-Nitro blocks only (block 22,207,815 and later). For pre-Nitro blocks, use the arbtrace_* methods instead.
This method re-executes all transactions in the block, which can be resource-intensive for blocks with many transactions.
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​
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 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

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");

​
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.

Body

application/json
​
id
integer
default:1
​
jsonrpc
string
default:2.0
​
method
string
default:debug_intermediateRoots
​
params
(string | Tracing options · object)[]

The hash of the block.

Response

200 - application/json

Returns intermediate state roots for each transaction in the block.

​
jsonrpc
string
​
id
integer
​
result
string[]
Last modified on March 13, 2026