genesis_chunked - Cosmos

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

Returns a chunk of the genesis document. Chunks are 0-indexed; call repeatedly with increasing chunk values until you've fetched all chunks (the response includes a total chunk count).

Parameters

Parameter	Type	Required	Description
chunk	integer	Yes	Chunk index (0-based)

Request Example

cURL

# JSON-RPC over HTTP POST (canonical)
curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/genesis_chunked' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "genesis_chunked",
    "params": {
        "chunk": 0
    },
    "id": "getblock.io"
}'

# URI over HTTP GET (alternate, for simple methods)
curl --location --request GET 'https://go.getblock.io/<ACCESS-TOKEN>/genesis_chunked?chunk=0'

JavaScript (Axios)

Python (Requests)

Rust (Reqwest)

Response Example

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": {
        "chunk": 0,
        "total": 47,
        "data": "ewogICJnZW5lc2lzX3RpbWUiOiAiMjAxOS0xMi0xMVQxNjoxMTozNFoiLAogICJjaGFpbl9pZCI6ICJjb3Ntb3NodWItNCIsCiAg..."
    }
}

Response Parameters

Field	Type	Description
result.chunk	integer	Index of this chunk (echoed)
result.total	integer	Total number of chunks composing the full genesis file
result.data	string	Base64-encoded chunk of the genesis JSON

Use Cases

• Downloading the Cosmos Hub genesis file in pieces

• Reconstructing initial state for archival nodes

• Light client initialization from a trusted genesis

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>/genesis_chunked');
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": "genesis_chunked", "params": {"chunk": 0}});
console.log(result);

cosmpy / requests