block - Cardano

Example code for the block JSON_RPC method. Complete guide on how to use block JSON_RPC in GetBlock Web3 documentation.

This endpoint returns a block and its transactions, identified by index or hash. Balance-changing operations are expressed in the Rosetta operation model.

Parameters

The request body is a JSON object with the following fields.

Field	Type	Required	Description
network_identifier	object	Yes	The network to query
block_identifier	object	Yes	Partial identifier with an index or a hash

Request

cURL

curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/block' \
--header 'Content-Type: application/json' \
--data-raw '{
    "network_identifier": {
        "blockchain": "cardano",
        "network": "mainnet"
    },
    "block_identifier": {
        "index": 10453789
    }
}'

JavaScript

example.js

const response = await fetch(
    'https://go.getblock.io/<ACCESS-TOKEN>/block',
    {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({"network_identifier": {"blockchain": "cardano", "network": "mainnet"}, "block_identifier": {"index": 10453789}})
    }
);
console.log(await response.json());

Python

example.py

import requests

response = requests.post(
    'https://go.getblock.io/<ACCESS-TOKEN>/block',
    headers={'Content-Type': 'application/json'},
    json={"network_identifier": {"blockchain": "cardano", "network": "mainnet"}, "block_identifier": {"index": 10453789}}
)

print(response.json())

Response

{
    "block": {
        "block_identifier": {
            "index": 10453789,
            "hash": "6e9e89632bc5c72030d3a486647e889c48d63e4da0643191b13566ad816d2d57"
        },
        "parent_block_identifier": {
            "index": 10453788,
            "hash": "000...parent"
        },
        "timestamp": 1617180599000,
        "transactions": [
            {
                "transaction_identifier": {
                    "hash": "10b54fd708ab2e5703979b4ba27ca0339882abc2062e77fbe51e625203a49642"
                },
                "operations": [
                    {
                        "operation_identifier": {
                            "index": 0
                        },
                        "type": "output",
                        "status": "success",
                        "account": {
                            "address": "addr1qxy2lpan99fcnhhyzr8w8qk4dqz4mp7g6b8h3r2v5c9d0e1f2g3h4j5k6l7m8n9p0q"
                        },
                        "amount": {
                            "value": "9407625",
                            "currency": {
                                "symbol": "ADA",
                                "decimals": 6
                            }
                        }
                    }
                ]
            }
        ]
    }
}

Response Parameters

Field	Type	Description
block.block_identifier	object	Index and hash of the block
block.parent_block_identifier	object	Index and hash of the parent block
block.timestamp	integer	Block timestamp in milliseconds
block.transactions	array	Transactions with their Rosetta operations

Use Cases

• Block Explorers: Render block contents as Rosetta operations

• Chain Indexing: Stream blocks into a Rosetta-based indexer

• Reconciliation: Derive balance changes from block operations

• Exchange Integration: Detect deposits by scanning block operations

Error Handling

Error Code	Message	Description
1	Invalid request	The request body is malformed or missing required fields
4	Block not found	The requested block does not exist on this node
5	Internal error	The node failed to answer the request