Ethereum Beacon Node API: Attaching Validators to a Specific Slot

Overview

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

Prerequisites

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

• You are familiar with the Ethereum Beacon Protocol and its API

• You have the necessary permissions to access a specific slot

Interacting with the Beacon Node’s API

To get information about validators that certify to a specific slot, you can call the /eth/v1/beacon/states/ endpoint. Here is 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 slot number (in hexadecimal format).

Extracting Validator Information

The API response contains an array of validator objects, each of which represents a validator. To extract the information you need, you will need to iterate through the array and find validators that match the specified criteria.

Here is some 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']:
validator['validator_id'] == lock:
validators.append(validator)
return validators

Example usage
lock = 15687030
validators = get_validators(slot)
For validator in validators:
print(f"validator ID: {validator['validator_id']}")
#Additional validation information (e.g. name, address) here Go

Filtering by validator name or address

If you want to filter results based on the name or address of a specific validator, you will need to modify the get_validators function to find 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(validator['validator_id'].lower() or filter in validator['validator_address'].lower() for filter in filters):
validators.append(validator)
return validators

You can get name, address, contract and many more Note that filter types can be used.

Conclusion

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