Checkpoints

Retrieves a list of cryptographic sync checkpoints generated by the Prover node, allowing clients to verify data integrity against specific block heights.

Endpoint

POST https://indexer.zcashnames.co/v1.0/checkpoints

Request Body

The request body must be a JSON object containing the following parameters:

Parameter	Type	Default	Description
count	integer	100	Limit the maximum number of checkpoints returned in a single response.
from_block	integer	None	Request the checkpoint data starting from this specific block height.
order	string	desc	The sorting order of the checkpoints. Accepted values: asc or desc.

---

Code Examples

cURL

curl -X POST https://indexer.zcashnames.co/v1.0/checkpoints \
  -H "Content-Type: application/json" \
  -d '{
    "count": 2,
    "from_block": 1,
    "order": "asc"
  }'

JavaScript

const url = 'https://indexer.zcashnames.co/v1.0/checkpoints';
const data = {
    count: 2,
    from_block: 1,
    order: 'asc'
};

fetch(url, {
    method: 'POST',
    headers: {
        'Content-Type': 'application/json'
    },
    body: JSON.stringify(data)
})
    .then(response => response.json())
    .then(result => console.log(result))
    .catch(error => console.error('Error:', error));

Python

import requests

url = "https://indexer.zcashnames.co/v1.0/checkpoints"
payload = {
    "count": 2,
    "from_block": 1,
    "order": "asc"
}
headers = {
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)
print(response.json())

PHP

<?php

$url = 'https://indexer.zcashnames.co/v1.0/checkpoints';
$data = [
    'count' => 2,
    'from_block' => 1,
    'order' => 'asc'
];

$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'Content-Type: application/json'
]);

$response = curl_exec($ch);
curl_close($ch);

$result = json_decode($response, true);
print_r($result);

Response Example

{
  "response": [
    {
      "block_id": 3422048,
      "smt_root": "b4c9dacf8e194e353dce7638d76f282fe40399f7b0ad74a2229a6d4f5be774de",
      "evm_block_id": 290453948,
      "evm_tx_hash": "0xcfc86b34ad55450b73511d9ce5b5d33e5e0e2366ceb7ae7e81bdcce62f57de38"
    },
    {
      "block_id": 3422335,
      "smt_root": "eba675788f0fbf1df8a3c32e83da3e71dfd9337cca5a7c8ae2f51e963d03be17",
      "evm_block_id": 290504572,
      "evm_tx_hash": "0x9f943993b6e6430fe3da448c52b122342c0a629e7eca520d1d22df063c22002b"
    }
  ]
}

Field	Type	Description
block_id	int	The last ZCash block_id included in the checkpoint
smt_root	string	Checkpoint's SMT Root
evm_block_id	string	EVM block_id of the checkpoint creation
evm_tx_hash	string	EVM tx_hash of the checkpoint creation