Continuation of this post:

- https://hive.blog/blockchain/@the.journal/how-to-encrypt-information-in-customjson-episode-1

Now we are going to retrieve the encrypted message from the blockchain, and decrypt it for our usage.

The script I'm going to use is in `python` like the previous one, and it will parse each single block to check if there is a custom_json with our id in order to get the message. so let's start to import the libraries 

```python
from beem.blockchain import Blockchain
from beem import Steem
from beem.nodelist import NodeList
import re
from cryptography.fernet import Fernet
nodelist = NodeList()
nodelist.update_nodes()
```

After that we need to load the `Fernet` key we saved before in order to decrypt the message. 

```python
def load_key():
    """
    Loads the key named `secret.key` from the current directory.
    """
    k=open("secret.key", "rb").read()
    return k
key = load_key()
f = Fernet(key)
```

Let's start the blockchain instance for this example we will use the `steem` blockchain, but it works as well for the `hive` one.

```python
stm = Steem(node=nodelist.get_steem_nodes())
b = Blockchain(blockchain_instance=stm)
```

Now let's start an infinite loop to keep check the blocks, and print out the message once found in the blockchain.

```python
for i in b.blocks(start=b.get_current_block_num()):
    print (i['id'])
    for t in i['transactions']:
        for o in t['operations']:
            if o['type']=='custom_json_operation':
                if o['value']['id']=='test_DM':
                    enc= re.findall('"type":"(.+?)"',o['value']['json'])[0]
                    ms=enc.encode('utf_8')
                    decrypted_message = str(f.decrypt(ms))
                    print (decrypted_message.replace("b'",'').replace("'",''))
```
Normally it takes around a minute from the custom_json publication to get discovered in the blockchain.