Ethereum Beacon Node API: Attaching Validators to a Specific Slot

Overview

In this article, we’ll explore how to interact with the Ethereum beacon node’s API to retrieve information about validators attesting to specific slots. This involves calling the /eth/v1/beacon/states/ endpoint and using its slots parameter to filter results.

Prerequisites

• You have an account on an Ethereum network (e.g., mainnet, testnet)

• You’re familiar with the Ethereum Beacon Protocol and its API

• You have the necessary permissions to access the specified slot

Interacting with the Beacon Node’s API

To retrieve information about validators attesting to a specific slot, you can call the /eth/v1/beacon/states/ endpoint. Here’s an example of how to do it:

curl -X GET \

   \

  --data-urlencode "q=0x1234567890abcdef&slot=15687030" \

  --header 'Content-Type: application/json'

Replace YOUR_PROJECT_ID with your actual Infura project ID and the slot number (in hexadecimal format).

Extracting Validator Information

The API response will contain an array of validator objects, each representing a validator. To extract the information you need, you’ll want to iterate over the array and find the validators that match the specified criteria.

Here’s some sample code in Python using the requests library:

import requests


def get_validators(slot):

    url = f"

    response = requests.get(url, headers={'Content-Type': 'application/json'})

    data = response.json()

    

    validators = []

    for validator in data['slots']:

        if validator['validator_id'] == slot:

            validators.append(validator)

    

    return validators







Example usage

slot = 15687030

validators = get_validators(slot)


for validator in validators:

    print(f"Validator ID: {validator['validator_id']}")

    
Additional validation information (e.g., name, address) goes here

Filtering by Validator Name or Address

If you need to filter the results based on a specific validator’s name or address, you’ll want to modify the get_validators function to search for validators that match your criteria.

For example:

def get_validators(slot, filters):

    url = f"

    params = {'q': ' OR '.join(f"validator.name='{filter}' AND validator.address='{filter}'" for filter in filters)}

    response = requests.get(url, headers={'Content-Type': 'application/json'}, params=params)

    

    data = response.json()

    validators = []

    for validator in data['slots']:

        if any(filter in validator['validator_id'].lower() or filter in validator['validator_address'].lower() for filter in filters):

            validators.append(validator)

    

    return validators

Note that you can use different types of filters, such as name, address, contract, and more.

Conclusion

By following these steps, you should be able to interact with the Ethereum beacon node’s API to retrieve information about validators attesting to specific slots. Remember to always verify your Infura project ID and ensure that your network is compatible with the Beacon Protocol before running this code in production.

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