Chat with us, powered by LiveChat
← Return to MyDisct Solver

BLS Captcha Image Solving

Solve BLS (visa appointment system) captcha challenges. BLS uses numeric OCR captchas with fixed 3-digit format for visa application verification with 99.7% accuracy.

What is BLS Image?

BLS (Bureau of Land and Surveys) is the visa appointment system used by many countries for scheduling visa interviews. It uses a simple 3-digit numeric CAPTCHA that requires users to read and enter numbers displayed in an image. Our OCR system is specifically optimized for this format and provides near-perfect accuracy.

Captcha Type

Use the following captcha type identifier in your API requests: 

"type": "BLS_IMAGE"

Request Format

POST /createTask

Request Parameters

Parameter Type Required Description
captcha.type string required Must be "BLS_IMAGE"
captcha.metadata.siteUrl string required BLS website URL
captcha.payload.images array required Array of base64-encoded captcha images
Fixed Parameters

BLS captcha has fixed parameters (handled server-side): numeric only, 3 digits, case insensitive. You only need to provide images.

Example Request

JavaScript 
const response = await fetch('https://solver-api.mydisct.com/createTask', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'apikey': 'YOUR_API_KEY'
  },
  body: JSON.stringify({
    auth: { token: 'YOUR_API_KEY' },
    context: { source: 'api', version: '1.0.0' },
    captcha: {
      type: 'BLS_IMAGE',
      metadata: {
        siteUrl: 'https://blsappointment.com'
      },
      payload: {
        images: ['captcha_image_base64']
      }
    }
  })
});

Response Format

Create Task Response

JSON 
{
  "success": true,
  "service": "MyDisct Solver",
  "message": "Captcha is being processed",
  "task": {
    "id": "MyDisctSolver_abc123",
    "status": "processing"
  }
}

Fetch Result Response (Processing)

JSON 
{
  "success": true,
  "service": "MyDisct Solver",
  "message": "Captcha is being processed",
  "task": {
    "id": "MyDisctSolver_abc123",
    "status": "processing"
  }
}

Fetch Result Response (Completed)

JSON 
{
  "success": true,
  "service": "MyDisct Solver",
  "message": "Captcha solved successfully",
  "task": {
    "id": "MyDisctSolver_abc123",
    "status": "completed",
    "result": {
      "answers": "347",
      "timestamp": "2025-11-05T12:34:56.789Z"
    }
  }
}

Returns 3-digit numeric string.

Python Example

Python 
import requests
import time

def solve_bls(image_base64, site_url, api_key):
    create_response = requests.post(
        'https://solver-api.mydisct.com/createTask',
        headers={'Content-Type': 'application/json', 'apikey': api_key},
        json={
            'auth': {'token': api_key},
            'context': {'source': 'api', 'version': '1.0.0'},
            'captcha': {
                'type': 'BLS_IMAGE',
                'metadata': {'siteUrl': site_url},
                'payload': {
                    'images': [image_base64]
                }
            }
        }
    )
    
    create_data = create_response.json()
    if not create_data['success']:
        raise Exception(create_data['error']['message'])
    
    task_id = create_data['task']['id']
    
    while True:
        time.sleep(2)  # BLS is fast
        result_response = requests.post(
            'https://solver-api.mydisct.com/fetchResult',
            headers={'Content-Type': 'application/json', 'apikey': api_key},
            json={'taskId': task_id}
        )
        
        result_data = result_response.json()
        if result_data['task']['status'] == 'completed':
            return result_data['task']['result']['answers']
        elif result_data['task']['status'] == 'failed':
            raise Exception('Captcha solving failed')

solution = solve_bls(
    image_base64='captcha_image_base64',
    site_url='https://blsappointment.com',
    api_key='YOUR_API_KEY'
)
print(f'BLS Code: {solution}')

Best Practices

Recommendations
  • BLS always returns 3 numeric digits
  • Very fast solving (1-2 seconds)
  • No additional parameters needed
  • High accuracy for numeric OCR
  • Single image input

Common Issues

Issue: Wrong captcha length

Solution: BLS always returns exactly 3 digits. If you receive a different length, check that you're using the correct captcha type.

Issue: Non-numeric characters

Solution: BLS is always numeric-only. If you receive letters or special characters, there may be an issue with image quality or the wrong captcha type is being used.