<img src="https://steemit-production-imageproxy-thumbnail.s3.amazonaws.com/U5drxhdemuq4r4ezSCFC6xhAknvQspB_1680x8400">

#### Calculating witness rewards
***

Every time a witness produces a block, steem blockchain rewards the witness with a **producer_reward** operation in the blockchain. This is a virtul operation - don't exactly bounded to a transaction, therefore it doesn't have a transaction ID.

It is possible to go through the account history and calculate how much a witness made by being a witness. :)

Some of the properties of a producer_reward operation:

	{
	    'producer': 'emrebeyler',
	    'vesting_shares': '1980.464769 VESTS',
	    'block': 20633599,
	    'timestamp': '2018-03-13T07:48:27',
	}

#### Main Flow of the script
***

- Go through the account history
- Filter "producer_reward" operations
- Sum all rewarded VESTS and convert to Steam Power

<center><img src="http://i.hizliresim.com/YgaNn2.png"></center>
<center><sup>My witness earnings so far. I am rich!</sup></center>

#### Script
***

```
from steem import Steem
from steem.account import Account
from steem.amount import Amount
from steem.converter import Converter
import logging
logger = logging.getLogger('producer rewards')
logger.setLevel(logging.INFO)
logging.basicConfig()
def calculate_producer_rewards(steemd_instance, witness_account):
    account = Account(witness_account,steemd_instance=steemd_instance)
    total_vests = 0
    for producer_reward in account.history_reverse(filter_by=["producer_reward"]):
        total_vests += Amount(producer_reward["vesting_shares"]).amount
    converter = Converter(steemd_instance=s)
    total_sp = converter.vests_to_sp(total_vests)
    return total_vests, total_sp
if __name__ == '__main__':
    s = Steem(nodes=["https://api.steemit.com"])
    witness_account = 'emrebeyler'
    vests, sp = calculate_producer_rewards(s, witness_account)
    print("Account: %s, Total Vests: %s, Total SP: %s" % (
        witness_account, round(vests, 2), round(sp, 2)))
```

See the script nicely formatted at [Github Gists](https://gist.github.com/emre/ffb0c8e895b0e4d9506f3f587664dd2b).

#### Notes
***

- This script scans all operation history. Execution time may take forever for old witnesses.

- Conversion to the SP is done with the current VESTS to SP rate. This is a dynamic variable and may differ from time to time.

#### Requirements
***

You need to have **steem-python** library installed in your local environment.

Have fun.