commit - Cosmos

Example code for the commit JSON-RPC method. Complete guide on how to use commit JSON-RPC in GetBlock Web3 documentation.

Returns the commit (validator signatures) for a block at a given height. The commit proves the validator set agreed on the block; light clients use this to verify chain progression.

Parameters

Parameter	Type	Required	Description
height	integer	No	Block height (decimal). Defaults to the latest committed block

Request Example

cURL

# JSON-RPC over HTTP POST (canonical)
curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/commit' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "commit",
    "params": {
        "height": 23456789
    },
    "id": "getblock.io"
}'

# URI over HTTP GET (alternate, for simple methods)
curl --location --request GET 'https://go.getblock.io/<ACCESS-TOKEN>/commit?height=23456789'

JavaScript (Axios)

Python (Requests)

Rust (Reqwest)

Response Example

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": {
        "signed_header": {
            "header": {
                "chain_id": "cosmoshub-4",
                "height": "23456789",
                "time": "2026-05-26T13:42:18.5273Z"
            },
            "commit": {
                "height": "23456789",
                "round": 0,
                "block_id": {
                    "hash": "6E2A2A6FE7A5B4C2D4E6F8A0B2C4D6E8F0A2C4E6F8B0D2E4F6A8C0E2F4B6D8E0",
                    "parts": {
                        "total": 1,
                        "hash": "..."
                    }
                },
                "signatures": [
                    {
                        "block_id_flag": 2,
                        "validator_address": "8E2B7A...",
                        "timestamp": "2026-05-26T13:42:18.5273Z",
                        "signature": "AAA..."
                    }
                ]
            }
        },
        "canonical": true
    }
}

Response Parameters

Field	Type	Description
result.signed_header.header	object	Block header
result.signed_header.commit	object	Commit data with validator signatures
result.signed_header.commit.signatures	array	Per-validator signatures on this block
result.canonical	boolean	Whether this commit is canonical (final)

Use Cases

• Light client verification

• Cross-chain proofs (IBC relayers verify peer chain commits)

• Auditing validator participation in consensus

Error Handling

Status Code	Error Message	Cause
404	Not found	Missing or invalid <ACCESS-TOKEN>
-32602	Invalid params	Request parameters are missing or malformed
-32603	Internal error	Server-side error while processing the request
429	Too Many Requests	Rate limit exceeded for your plan

SDK Integration

CosmJS

import { Tendermint37Client, HttpClient } from '@cosmjs/tendermint-rpc';

const httpClient = new HttpClient('https://go.getblock.io/<ACCESS-TOKEN>/commit');
const client = await Tendermint37Client.create(httpClient);

// CosmJS exposes typed methods on the client (e.g. client.status(), client.block()).
// For raw access to any RPC method:
const result = await httpClient.execute({"jsonrpc": "2.0", "id": "getblock.io", "method": "commit", "params": {"height": 23456789}});
console.log(result);

cosmpy / requests